77193076 MPH Advanced Service Manual

TechnicalPublications

2165118100Revision 4

MPH 50 V2 - MPH 65 V2 - MPH 80 V2asmAdvanced Service Manual

do not duplicate

Advanced Service DocumentationProperty of GEFor GE Service Personnel OnlyNo Rights Licensed Do Not Use or CopyDisclosure to Third Parties Prohibited

Copyright 1999, 2002 by General Electric Co.

ATTENTIONLES APPAREILS RAYONS X SONT DANGEREUX LA FOIS POUR LE PATIENT ET POUR LE MANIPULATEUR

SI LES MESURES DE PROTECTION NE SONT PAS STRICTEMENT APPLIQUEESBien que cet appareil soit construit selon les normes de scurit les plus svres, la source de rayonnement X reprsente un dangerlorsque le manipulateur est non qualifi ou non averti. Une exposition excessive au rayonnement X entrane des dommages lorganisme.Par consquent, toutes les prcautions doivent tre prises pour viter que les personnes non autorises ou non qualifies utilisent cetappareil crant ainsi un danger pour les autres et pour ellesmmes.Avant chaque manipulation, les personnes qualifies et autorises se servir de cet appareil doivent se renseigner sur les mesures deprotection tablies par la Commission Internationale de la Protection Radiologique, Annales 26 : Recommandations de la CommissionInternationale sur la Protection Radiologique et les normes nationales en vigueur.

WARNINGXRAY EQUIPMENT IS DANGEROUS TO BOTH PATIENT AND OPERATOR

UNLESS MEASURES OF PROTECTION ARE STRICTLY OBSERVEDThough this equipment is built to the highest standards of electrical and mechanical safety, the useful xray beam becomes a source ofdanger in the hands of the unauthorized or unqualified operator. Excessive exposure to xradiation causes damage to human tissue.Therefore, adequate precautions must be taken to prevent unauthorized or unqualified persons from operating this equipment or exposingthemselves or others to its radiation.Before operation, persons qualified and authorized to operate this equipment should be familiar with the Recommendations of the Interna-tional Commission on Radiological Protection, contained in Annals Number 26 of the ICRP, and with applicable national standards.

ATENCIONLOS APARATOS DE RAYOS X SON PELIGROSOS PARA EL PACIENTE Y EL MANIPULADOR

CUANDO LAS NORMAS DE PROTECCION NO ESTAN OBSERVADASAunque este aparato est construido segn las normas de seguridad ms estrictas, la radiacin X constituye un peligro al ser manipuladopor personas no autorizadas o incompetentes. Una exposicin excesiva a la radiacin X puede causar daos al organismo.Por consiguiente, se debern tomar todas las precauciones necesarias para evitar que las personas incompetentes o no autorizadasutilicen este aparato, lo que sera un peligro para los dems y para s mismas.Antes de efectuar las manipulaciones, las personas habilitadas y competentes en el uso de este aparato, debern informarse sobre lasnormas de proteccin fijadas por la Comisin Internacional de la Proteccin Radiolgica, Anales No 26: Recomendacines de la Comi-sin Internacional sobre la Proteccin Radiolgica y normas nacionales.

ACHTUNGRNTGENAPPARATE SIND EINE GEFAHR FR PATIENTEN SOWIE BEDIENUNGSPERSONAL,WENN DIE GELTENDEN SICHERHEITSVORKEHRUNGEN NICHT GENAU BEACHTET WERDEN

Dieser Apparat entspricht in seiner Bauweise strengsten elektrischen und mechanischen Sichereitsnormen, doch in den Hnden unbe-fugter oder unqualifizierter Personen wird er zu einer Gefahrenquelle. bermige Rntgenbestrahlung ist fr den menschlichen Orga-nismus schdlich.Deswegen sind hinreichende Vorsichtsmanahmen erforderlich, um zu verhindern, daunbefugte oder unqualifizierte Personen solcheGerte bedienen oder sich selbst und andere Personen deren Bestrahlung aussetzen knnen.Vor Inbetriebnahme dieses Apparats sollte sich das qualifizierte und befugte Bedienungspersonal mit den geltenden Kriterien fr den ge-fahrlosen Strahleneinsatz durch sorgfltiges Studium des Hefts Nr. 26 der Internationalen Kommission fr Strahlenschutz (ICRP) vertrautmachen: Empfehlungen der Internationalen Kommission fr Strahlenschutz und anderer nationaler Normenbehrden.

GE Medical Systems MPH 50 V2 - MPH 65 V2 - MPH 80 V2REV 4 asm 2165118100

i

THIS SERVICE MANUAL IS AVAILABLE IN ENGLISH ONLY.

IF A CUSTOMERS SERVICE PROVIDER REQUIRES A LANGUAGE OTHER THANENGLISH, IT IS THE CUSTOMERS RESPONSIBILITY TO PROVIDE TRANSLATIONSERVICES.

DO NOT ATTEMPT TO SERVICE THE EQUIPMENT UNLESS THIS SERVICEMANUAL HAS BEEN CONSULTED AND IS UNDERSTOOD.

FAILURE TO HEED THIS WARNING MAY RESULT IN INJURY TO THE SERVICEPROVIDER, OPERATOR OR PATIENT FROM ELECTRIC SHOCK, MECHANICALOR OTHER HAZARDS.

CE MANUEL DE MAINTENANCE NEST DISPONIBLE QUEN ANGLAIS. SI LE TECHNICIEN DU CLIENT A BESOIN DE CE MANUEL DANS UNE AUTRE

LANGUE QUE LANGLAIS, CEST AU CLIENT QUIL INCOMBE DE LE FAIRETRADUIRE.

NE PAS TENTER DINTERVENTION SUR LES QUIPEMENTS TANT QUE LEMANUEL SERVICE NA PAS T CONSULT ET COMPRIS.

LE NON-RESPECT DE CET AVERTISSEMENT PEUT ENTRANER CHEZ LETECHNICIEN, LOPRATEUR OU LE PATIENT DES BLESSURES DUES DESDANGERS LECTRIQUES, MCANIQUES OU AUTRES.

DIESES KUNDENDIENSTHANDBUCH EXISTIERT NUR INENGLISCHER SPRACHE.

FALLS EIN FREMDER KUNDENDIENST EINE ANDERE SPRACHE BENTIGT, ISTES AUFGABE DES KUNDEN FR EINE ENTSPRECHENDE BERSETZUNG ZUSORGEN.

VERSUCHEN SIE NICHT, DAS GERT ZU REPARIEREN, BEVOR DIESESKUNDENDIENSTHANDBUCH NICHT ZU RATE GEZOGEN UND VERSTANDENWURDE.

WIRD DIESE WARNUNG NICHT BEACHTET, SO KANN ES ZU VERLETZUNGENDES KUNDENDIENSTTECHNIKERS, DES BEDIENERS ODER DES PATIENTENDURCH ELEKTRISCHE SCHLGE, MECHANISCHE ODER SONSTIGE GEFAHRENKOMMEN.

ESTE MANUAL DE SERVICIO SLO EXISTE EN INGLS. SI ALGN PROVEEDOR DE SERVICIOS AJENO A GEMS SOLICITA UN IDIOMA

QUE NO SEA EL INGLS, ES RESPONSABILIDAD DEL CLIENTE OFRECER UNSERVICIO DE TRADUCCIN.

NO SE DEBER DAR SERVICIO TCNICO AL EQUIPO, SIN HABER CONSULTADO YCOMPRENDIDO ESTE MANUAL DE SERVICIO.

LA NO OBSERVANCIA DEL PRESENTE AVISO PUEDE DAR LUGAR A QUE ELPROVEEDOR DE SERVICIOS, EL OPERADOR O EL PACIENTE SUFRAN LESIONESPROVOCADAS POR CAUSAS ELCTRICAS, MECNICAS O DE OTRANATURALEZA.

WARNING

AVERTISSEMENT

WARNUNG

AVISO


ii

ESTE MANUAL DE ASSISTNCIA TCNICA S SE ENCONTRADISPONVEL EM INGLS.

SE QUALQUER OUTRO SERVIO DE ASSISTNCIA TCNICA, QUE NO A GEMS,SOLICITAR ESTES MANUAIS NOUTRO IDIOMA, DA RESPONSABILIDADE DOCLIENTE FORNECER OS SERVIOS DE TRADUO.

NO TENTE REPARAR O EQUIPAMENTO SEM TER CONSULTADO ECOMPREENDIDO ESTE MANUAL DE ASSISTNCIA TCNICA.

O NO CUMPRIMENTO DESTE AVISO PODE POR EM PERIGO A SEGURANA DOTCNICO, OPERADOR OU PACIENTE DEVIDO A CHOQUES ELTRICOS,MECNICOS OU OUTROS.

IL PRESENTE MANUALE DI MANUTENZIONE DISPONIBILESOLTANTO IN INGLESE.

SE UN ADDETTO ALLA MANUTENZIONE ESTERNO ALLA GEMS RICHIEDE ILMANUALE IN UNA LINGUA DIVERSA, IL CLIENTE TENUTO A PROVVEDEREDIRETTAMENTE ALLA TRADUZIONE.

SI PROCEDA ALLA MANUTENZIONE DELLAPPARECCHIATURA SOLO DOPO AVERCONSULTATO IL PRESENTE MANUALE ED AVERNE COMPRESO IL CONTENUTO.

NON TENERE CONTO DELLA PRESENTE AVVERTENZA POTREBBE FARCOMPIERE OPERAZIONI DA CUI DERIVINO LESIONI ALLADDETTO ALLAMANUTENZIONE, ALLUTILIZZATORE ED AL PAZIENTE PER FOLGORAZIONEELETTRICA, PER URTI MECCANICI OD ALTRI RISCHI.

ATENO

AVVERTENZA

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v

TABLE OF CONTENTS

CHAPTER TITLE PAGE

WARNING i. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMPORTANT XRAY PROTECTION iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REVISION HISTORY xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LIST OF EFFECTIVE PAGES xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 THEORY OF OPERATION 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 INTRODUCTION 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Applications 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Functions 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Component Assemblies 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 Power Unit 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Extension Rack 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Console 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2 SOFTWARE ARCHITECTURE 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Background 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Organization 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3 OVERVIEW 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 CPU Communication 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Error handling 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4 POWER ON/RESET DIAGNOSTICS 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 PRD Test Sequence 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Firmware Initialization 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5 INITIALIZATION 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 ON/OFF Function 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 On/Off sequencing: Command 1 control 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521 Standby mode - 3 Phase control 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522 Power ON sequence 112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523 Power OFF sequence 113. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Main Power Supply Contactors and Power Control 116. . . . . . . . . . . . . . . . . . . . . . . . . . . . 531 LV Power Supplies DC supply 116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 532 Contactors power on 116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 533 AC power control 116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 534 DC power control 117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


vi

TABLE OF CONTENTS (CONT.)

CHAPTER TITLE PAGE

54 DC Power Supply generation 120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Power Supply-related Error Codes 120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 6 ROTOR CONTROLLER FUNCTION 123. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Introduction 123. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Rotor Function Sequencing 123. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Rotor Controller Command 127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631 Rotor controller: Command 2 EPLD 127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632 IGBT command drivers 127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633 Phase measurements and maximum current detection 127. . . . . . . . . . . . . . . . . . . . . . . . . . 634 High Speed capacitors selection 128. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Rotor Controller Power Inverter 130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641 Rotor controller inverter 130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642 Current measurements 130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643 High Speed capacitors 130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644 Tube housing cooling 131. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Rotor Controller Error Handling 131. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Rotor Controller Thermal Protection 132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 7 HEATER FUNCTION 134. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Introduction 134. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Heater Function Sequencing 134. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Heater Command 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 731 Heater control: Command 2 EPLD 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 732 IGBT command drivers 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 733 RMS heater current measure regulation 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 734 Heater inverters protection 138. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 735 Filament protection 138. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Heater Power inverter and HV Tank heater transformers 140. . . . . . . . . . . . . . . . . . . . . . . . 741 Heater inverters 140. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 742 High Voltage Tank heater transformers 141. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Heater Error Handling 141. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 8 KV GENERATION FUNCTION 144. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Introduction 144. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Exposure Sequencing 144. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 kV Command And Control 147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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CHAPTER TITLE PAGE

831 Inverter command, kV regulation and safeties: Command 1 EPLDs 147. . . . . . . . . . . . . . . 832 Inverter command: COMMAND EPLD 147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 833 kV regulation: REGULATION EPLD 148. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 834 kV function safeties: SAFETY EPLD 148. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 835 Main inverter drivers 149. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 836 kV measure and kV rise waveform 149. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 837 Inverter current measure 149. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 kV Power Inverter and HV Tank 151. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 841 kV main inverter 151. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 842 HV Tank transformer 153. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 kV Function Error Handling 155. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 kV Inverter Thermal Protection 155. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 9 MA FUNCTION 157. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Introduction 157. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 mA Measurement Circuit 157. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 mA Regulation 158. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 mA Error Handling 158. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 10 TUBE SELECTION FUNCTION 160. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Introduction 160. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Tube Selection Sequencing 162. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Tube Selection Error Handling 162. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 11 R/RF INTERFACE 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Description 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1111 Tubes 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1112 Tomography 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1113 Buckies 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114 Collimators 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1115 Arterio 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Composition 166. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1121 RF/One Tube 167. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1122 RF/Two Tubes 167. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1123 RAD/One or Two Tubes 167. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Operation 167. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1131 Wall Bucky Board MPH A6 A4 167. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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1132 Table Interface Board MPH A6 A2 168. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1133 Table Tomo Collimator Interface Board MPH A6 A5 168. . . . . . . . . . . . . . . . . . . . . . . . . . 1134 ROOM IF CPU Board MPH A6 A1 168. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Workstation Decoding Principle 169. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 How can the user trigger an x-ray exposure in a RF Remote system? 194. . . . . . . . . . . . . .

SECTION 12 AEC/AET FUNCTION 195. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 13 II SENSOR FUNCTION 197. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 Description 197. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1311 Function 197. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 14 CONTROL CONSOLE FUNCTION 1100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Purpose 1100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Console Makeup 1100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 Operation 1100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1431 Console Control Board (MPH A3 A2) 1100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1432 Switchon Tests 1103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1433 Console Service Test 1103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1434 Multiplexed Readout 1104. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1435 Communicating with the Generator 1105. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 15 PROGRAM-X FUNCTION 1107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 Purpose of PROGRAM-X 1107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 PROGRAM-X Composition 1107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 PROGRAM-X Control Board (MPH A8 A1) 1107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Switches, jumpers, LEDs and test points 1111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 16 PRINT-X FUNCTION 1112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 Purpose of PRINT-X 1112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 PRINT-X Composition 1112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 PRINT-X 1112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1631 Function equivalence chart 1113. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 17 0-POINT MODE 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Presentation 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1711 Definition 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1712 Purpose 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1713 Requirements 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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1714 Sequence of Operations 1115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1715 Constraints 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 Ergonomics 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1721 Access 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1722 Exposure-Factor Display on Control Console 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1723 Focal Spots 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1724 Automatic operations 1116. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1725 kV Override 1117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1726 CVN 1117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1727 Preprogrammed Examinations 1117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1728 Sequence in 0-Point Mode 1117. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Determining Rad kV Values: Rad LUT (p, kV) 1118. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Technical Limitations of Image Quality and of Physician 1118. . . . . . . . . . . . . . . . . . . . . . . 1741 Limits 1118. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1742 Priority 1119. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 Using the LUTs 1120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 Parameter Modification 1120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 Prestored LUT content 1120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

APPENDIX 1 FUNCTIONAL DESCRIPTION A11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 SECTION 1 INTRODUCTION A11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Introduction A11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

APPENDIX 2 USER INTERFACE A21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 INTRODUCTION A21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 2 USER/MACHINE INTERACTIONS A21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Service Terminal, GPX Console, or Console A21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Program-X A22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3 PROGRAM OUTPUTS FOR USER INFORMATION A22. . . . . . . . . . . . . . . . . . . .

2 BLOCKS DIAGRAMS 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 INTRODUCTION 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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3 DISASSEMBLY/REASSEMBLY 3I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 LIST OF JOB CARDS 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 001 Disassembly/Reassembly within the MPH Cabinet 33. . . . . . . . . . . . . . . . . . . Job Card DR 002 MPH A4 A1 CMD1 board replacement 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 003 MPH A4 A2 CMD2 board replacement 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 004 MPH A4 A3 CPU board replacement 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 005 MPH A3 A1 DC Filter Board replacement 313. . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 006 MPH A3 A2 Main Power Supply Board replacement 317. . . . . . . . . . . . . . . . . . Job Card DR 007 MPH A3 FL1 EMC Filter assembly replacement 321. . . . . . . . . . . . . . . . . . . . . Job Card DR 008 MPH A3 A3 Inverter replacement 323. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 009 MPH A2 HV TANK replacement 327. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 010 MPH A2 A2 HV tank SWITCH Motor replacement 329. . . . . . . . . . . . . . . . . . Job Card DR 011 MPH A5 A1 Heather Board replacement 331. . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 012 MPH A5 A2 Rotor Controller Board replacement 333. . . . . . . . . . . . . . . . . . . . Job Card DR 013 MPH A5 A3 Option Chiller Board replacement 337. . . . . . . . . . . . . . . . . . . . . . Job Card DR 014 MPH A5 PS 1, PS 2 Power Supply replacement 339. . . . . . . . . . . . . . . . . . . . . . Job Card DR 015 MPH A6 A1 room I/F CPU Board replacement 341. . . . . . . . . . . . . . . . . . . . . . Job Card DR 016 MPH A6 A2 Table interface board replacement 345. . . . . . . . . . . . . . . . . . . . . . Job Card DR 017 MPH A6 A3 distribution board replacement 347. . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 018 MPH A6 A4 Wall Bucky Board replacement 349. . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 019 MPH A6 A5 Table Tomo collimator board replacement 351. . . . . . . . . . . . . . . . Job Card DR 020 MPH A6 A6 II Sensor Board replacement 353. . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 021 MPH A6 PS1/ PS2 Power Supplies replacement 355. . . . . . . . . . . . . . . . . . . . . Job Card DR 022 Replacement of programX components 357. . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 023 Replacement of Xray tube and Exposure counter recording 365. . . . . . . . . . . . Job Card DR 024 Replacement of printX components 369. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card DR 025 kV/mA measurement calibration 373. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 DIAGNOSTICS 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 INTRODUCTION 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Overview 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Block convention 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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SECTION 2 PRD DESCRIPTION 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Functional Overview 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 Functional requirements for PRD 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 User/Operator Interface 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221 MPH Power on / Reset Diagnostics. Summary Of Switches And LEDS Utilization 46. . .

SECTION 3 SLD 418. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Here to use 418. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 TAV Tests Operator Interface 418. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312 Functional requirements for MPH SLD 424. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313 MPH functions 424. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314 MPH FRUs 424. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 SLD design description 425. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4 APPLICATION ERROR CODES 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Software Processing 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 Class I Error Treatment 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 Class II Error Treatment 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 Class III Error Treatment 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414 Class IV Error Treatment 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415 Error transmission Mechanism 426. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Diagnostic error list 439. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Diagnostic error code description 443. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5 OPTIONS TROUBLESHOOTING 4215. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF 001 Console display fault 4217. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF 002 Troubleshooting on program-X 4219. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF 003 Troubleshooting of print-X 4225. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF 004 Diagnostichelp tests 4229. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF005 Diagnostichelp tests ON/OFF and power supplies 4237. . . . . . . . . . . . . . . . . . . . Job Card VF006 Diagnostichelp tests DC bus voltage fault 4243. . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF007 Diagnostichelp tests serial links fault 4247. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF008 Troubleshooting 0-point mode 4251. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Job Card VF009 Diagnostichelp tests interface rad and fluoro 4263. . . . . . . . . . . . . . . . . . . . . . . .


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REVISION HISTORY

REV DATE REASON FOR CHANGE

% %$ " !#'#"& %&' &

( Level M4 Prestige VH with Integrated Console. New RF Table Interface Board: pages 1-64, 176, 177, 181 and 194 modified.

$ M4-AM milestone.

3

DR012 updated.

4 ( Updated as per BUCge60859.

LIST OF EFFECTIVE PAGES

PAGENUMBER

REVISIONNUMBER

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Title pageSafety Instruction

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11 thru 1120 4

A11 thru A12 4

A21 thru A22 4

21 thru 254 4

31 thru 380 4

41 thru 4276 4


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CHAPTER 1 THEORY OF OPERATION

SECTION 1INTRODUCTION

This document describes the operation of the MPH Generators (50, 65 or 80 kW).The MPH make up a line of generators which serve the following systems:

Radiographic systems.

RF Remote systems.

RF Cassettless systems.

11 Applications

The MPH can be used in systems with one or two tubes, radiography or fluoroscopy systems,or in combination of these system types. The following restrictions apply:

Only one tube may be used for fluoroscopy.

Bias tubes cannot be used.

Grid tubes cannot be used.

12 Functions

The main functions handled by the central unit in Application Mode are:

a. Power Unit start-up.

b. Operator Mode. Parameter selection.

c. Estimation of exposure parameters.

d. Management of tube thermal status.

e. Management of x-ray tube housing thermal status.

f. Automatic control of tube current in Radiography Mode and Fluoroscopy Mode.

g. Automatic control of Chamber Reset by kV in AET Mode.

h. Automatic Brightness Control (ABC) by kV in Fluoroscopy Mode.i. Automatic Quality Control (AQC) in Fluoroscopy Mode .j. Correction of film non-reciprocity effect in AEC Mode.k. Calculation of filament temperature.

l. Filament ageing compensation.

m. Control and monitoring of rotor Control Module.

n. Management of thermal status of rotor and kV converters.

o. Control and monitoring of Heater Module.

p. X-ray exposure control.

q. Change of tube selection.

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12

r. Room interface management.

s. Console management.

t. Program-X management.

u. Printer management.

v. Management of debugging console.

w. Error handling.

The main functions handled in Setup Mode are (see Service Manual) are:a. Management of the Service Terminal menus (one Application Menu and six Setup

Menus).b. Diagnostic menus (Menu 1 and Menu 2).c. Room configuration input (Menu 3).d. Tube parameter input (Menu 3).e. kV scale parameter input (Menu 3).f. Setup parameter input (Menu 3).g. Selection of data to be printed (Menu 3).h. Heating current calibration (Menu 4).i. Fluoroscopy calibration (Menu 4).j. AEC calibration for Ionix chamber (Menu 4).k. Selection of Zero-Point Mode, and ionization chamber calibration (Menu 4).l. RAM checksum update (Menu 5).

m. Post-display enable (Menu 5).n. Calibration of kV and mA chain (Menu 6).o. Calibration of kV divider frequency response (Menu 6).p. Calibration of dose in Radiography Mode (Menu 6).q. Diagnostic.

13 Component Assemblies

The MPH System Cabinet includes the following sub-assemblies:

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131 Power Unit

Sub-Assembly Designator Function

Room Distribution Panel MPH A1 Power supply for Positionner, II, Extension rack

HV Tank MPH A2 High Voltage Transformer 80 kW

DC Filter Board MPH A3 A1 AC rectifier to DC

Main Power Supply Board MPH A3 A2 3-Phase control, on/off drivers, dc detection

Inverter Board MPH A3 A3 Main High Frequency Inverter 80 kW

EMC Filter MPH A3 FL1 Line input filter

CPU Board MPH A4 A3 Exposure control

Command 1 Board MPH A4 A1 ON/OFF control, kV control, mA measure

Command 2 Board MPH A4 A2 Rotor controller command, filament control

Rotor Controller Board MPH A5 A2 Stator power supply

Heater Board MPH A5 A1 Filament power supply

LV2 Power Supply 24 V MPH A5 PS2 Low voltage power supply (24 V)LV1 Power Supply 15 V MPH A5 PS1 Low voltage power supply (15 V, 5 V)Chiller Interface MPH A5 A3 Optional control of Chiller or Local Water-Tap

132 Extension Rack

Sub-Assembly Designator Function

Room IF CPU Board MPH A6 A1 Dialog with Room and AEC Control

Table interface MHP A6 A2 Interface with Remote positionner and I. F.

Distribution Board MHP A6 A3 Power supply and interconnections

Wall Bucky Board MHP A6 A4 Interface with wall bucky and Room Door

Table Tomo Colimator MHP A6 A5 Interface with Rad Table with Tomo and automaticcollimator

I. I. Sensor Board MHP A6 A6 Supply for Photomultiplier and measure current ofphotomultiplier in I. I.

Power Supply MHP A6 PS1 Power supply 15 V, + 5 V for Room IF/CPU

Power Supply MHP A6 PS2 Power supply 15 V RF for Interface Board

Transformer MHP A6 A7 Various AC supply for AEC, Bucky, control con-sole, etc.

Plug Panel MHP A6 A8 Plug Panel for SAS connectors

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133 Console

Madrid Console MPH A7 Control Console

Program-X MPH A8 Anatomic Programs

Print-X MPH A9 Printer for Radiography parameters

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SECTION 2SOFTWARE ARCHITECTURE

21 Background

The MPH software, which is run on the PU_CTRL_CPU Board, is a combination of theMPG100 and SCPU software packages.The MPG100 software, formerly in Pascal, has been re-written in C. The entire softwarepackage is used, regardless of equipment, i.e., user interface and start-up.The SCPU software is included for exposure management, fault processing, and diagnosis.The SCPU and MPH generators have identical power controls.The software segment which is specific to the 68360 microprocessor has been re-written,based on the VRTX Spectra real-time nucleus. This segment concerns task management,series links, timers, mAs, and AEC cutoffs.

22 Organization

The software that run on the PU_CTRL_CPU board manages MPH power functions.Power management is broken down into several jobs.A number is assigned to each job to indicate its priority level. A small number indicates highpriority.Jobs communicate with each other via messages sent to message queues or mailboxes.Management of the various jobs is performed by the VRTX-SA software component.When a job receives a message, VRTX-SA authorizes execution if the job has higher prioritythan the current job. If not, it waits for completion of the current job before executing theother.When there is no current job, VRTX-SA activates the IDLE background job.The software run on the ROOM_IF_CPU Board manages room inputs and outputs.The two programs communicate via an HDLC-type link.

Error Code Name Cause

502 ERR_RAM Checksum RAM (PU parameters) corrupted.504 ERR_COD_TAB_FAIL

ERR_COD_TAB_FULLERR_FLOATVRTX_ERR

Error code table corrupted.Error code table full.Error detected in floating point calculation.Error detected in VRTX operation.

505 WATCHDOG_ERR Reset due to watchdog.

515 CONNECTIC_FAULT Connection error between PU_CTRL_CPU Board andCMD1 and CMD2 Boards (checked every 10 ms).

516 ADC_FAIL A/D conversion incomplete or reread of kV and ICH setpoints, too far from transmitted value.

550 XILINX_CONF_ERR XILINX configuration fault.

501 ERR_PILE The battery for non volatile RAM reack its maximum timeof use (3 years).RAM concerned on PU_CTRL_CPU and ProgramX ifpresent.

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SECTION 3OVERVIEW

31 CPU Communication

The PU_CTRL and ROOM_IF_CPU Boards communicate via an HDLC-type link, ensuringthe room interface.The ROOM_IF_CPU Board software reads the status of signals coming from the other Roommodules, and transmits these signals to the PU_CTRL_CPU Board. Tomography information received from positioner (tomography time, tomography

selected). DSA information (Linear Mode) received from DRS. Cassette size information received from positioner. Divided exposure information received from positioner. Slice information received from Image Module. Station information from Room. Exposure commands: Rad Prep, Exposure, and fluoro footswitch, received from

positioner. Video brightness, received from Image Module. Ionization chamber reset, received from positioner. Positioner transmission, DRS, and generator commands.The ROOM_IF_CPU Board software receives commands from the PU_CTRL_CPU Boardsoftware, and transmits them to the other modules, as follows: From workstations to the various room components (selection of these components). Selection of pick-up fields to DRS or to positioner (AEC). Selection of ionization chamber to positioner. Photomultiplier voltage to the image module. Generator authorization: Rad Prep finished, ready for radiography, ready for

fluoroscopy. X-ray emission.

32 Error handling


521 HDLC_ERROR Communication error with ROOM_IF_CPU

526 TST_COM_ERR Communication test with ROOM_IF_CPU Board(performed every 10 s) failed.

522 SCC3_ERROR Communication error with TAV/GPX

523 SCC4_ERROR Communication error with Control Console MADRID

524 SMCI_ERROR Communication error with APR

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ILLUSTRATION 11JOBS AND INTERRUPTION HANDLING

CLOCKS

CHASE

VRTX JOBS

ROTOR

INTERRUPTIONHANDLING

CONTROLCONSOLE KEYS

SERVICE TERMINALKEYS

PROGRAM_XRECEPTION

CONTROLCONSOLE DISPLAY

SERVICE TERMINALDISPLAY

PROGRAM_XTRANSMISSION

APPLI_MPGMAINTENANCE &

SET-UP

THERMAL

APPLI_SCPU

ROOM I/OTRANSMISSION

ROOM I/ORECEPTION

KEYBOARD

SCREEN

HEATER

ROOMIF CPU

OTHER PROGRAMS

CONTROLCONSOLE(MADRID)

PRGX

TAVGPXTJRADIOGRAPHY &FLUOROSCOPY

flashingLED sequence

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SECTION 4POWER ON/RESET DIAGNOSTICS

The MPH PRD high frequency generator Power ON/Reset sequence is initiated by one of thefollowing conditions:

Power applied to MPH PU_CTRL_CPU and ROOM_IF_CPU Boards.

Reset signal generated by board resident manual reset switch.

Either of these signals will reset the CPU Boards.

The purpose of this group of tests is to check operation of those functions on the MPH CPUBoards that are required to establish reliable communications. These diagnostic tests establishoperator confidence in the test execution sequence.

The primary functions of the Board are tested and, if these functions are within test limits, theyare used to test other Board functions.

If the primary functions are not testable, the test sequence is aborted.

The block diagram below shows the functions checked during the PU_CTRL_CPU andROOM_IF_CPU PRD sequence. Diagnosis is to a Field Replaceable Unit level (CPU Boardsfor PRD).Board functions should be tested in the sequence specified in the following paragraph. Likethe PU_CTRL_CPU Board, the ROOM_IF_CPU Board can execute PRD sequencesindependently. This is the reason why communication between both Boards is the lastPU_CTRL_CPU (Master Board) PRD sequence which cannot be ended, because theROOM_IF_CPU PRD sequences are not finished.

PRD Leds

PRD switches

PRD Leds

PRD switches68360

68302

TAV

ROOM_IF_CPU Board

PU_CTRL_CPU Board

SCC4

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41 PRD Test Sequence

The following tests are executed, in the order given:

1. CPU alive test: check minimum CPU functions.

2. EPROM checksum test: check the CPU Boards, flash EPROM checksum.

3. RAM test: check RAM used by the CPUs as a data and stack area.

This test can be run in three different modes: short, extended, and long. The short test isrun in normal operation; the extended or long test is run if requested by the on-boardswitch setting.

Microprocessor tests: set of tests to check Multiprocessors 68306 (PU_CTRL) and 68302(ROOM_IF) functions: Processor test: check any instructions not previously tested.

Watchdog test: check that the reset sequence following a watchdog timeout operatescorrectly.

Internal Timers: check operation of the 68302 (ROOM_IF_CPU) internal timers.These timers are used for AEC clock and time measurement.

Check operation of the 68360 (PU_CTRL_CPU) internal timers. These timers areused for time, mAs, bright exposure, and VRTX clock.

DMA and serial communication test: check operation of channel of (ROOM_IF) 68302,(PU_CTRL) 68360 (used to send and receive messages over the HDLC link).

42 Firmware Initialization

After completion of the PRD, Microcontroller 68302 registers (ROOM_IF_CPU), 68360registers (PU_CTRL_CPU) are initialized. Next, the real time monitor, VRTX, is initialized,and the first firmware initialization task, which initiates all the others, is started.

The MPH then sends the first message to the other CPU to start communication, and waits forconsole (GPX or Control Console MADRID) commands.

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ILLUSTRATION 12ON/OFF FUNCTION

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SECTION 5INITIALIZATION

51 ON/OFF Function

Refer to Illustration 12 (ON/OFF Function).The MPH ON/OFF function affects almost all the components of the generator: 380/480 V ac is fed to the MPH through the EMC Filter Board, which reduces noise

passing from the generator to the line during x-ray exposures. The DC Filter Board consists mainly of a rectifier and a filter. The dc output voltage

depends on the ac input: from 400 V dc to 760 V. The Main Power Supply Board includes several functions: 3-phase control (to insure the

right level of the 3-phase AC voltage), on/off relays to drive the room distribution (CT1)and generator (CT2) contactors, isolated 220 V ac rectifier (to supply the low voltagepower supplies), dc level measure (measures the dc level from the DC Filter Board andcodes it in three bits).Power is applied to the Extension Rack as soon as the Room distribution is energized.

The Command 1 Board includes: on/off logic (to enable and sequence Power On/Off,according to the _SYS_ON command, the DC level 3-phase control and thermoswitchof room power supply autotransformer), on/off relays to feed low voltage supplies (15V, +5 V, +24 V) to other boards.

The Command 2 Board includes control of low voltage supplies from the LV1 and LV2Power Supplies (15 V, +5 V, +24 V).

Other boards which use the low voltage power supplies: Inverter Board, Heater Board,Rotor Controller Board.

In standby mode, only the Main Power Supply Board, the15 V, +5V, and +24 V powersupplies LV1 and LV2, and a part of the Command 1 Board, are alive.In application mode, all boards are powered on.

52 On/Off sequencing: Command 1 control

521 Standby mode - 3 Phase control

Part of the Command 1 Board is alive in standby mode. It checks the presence of the 3-phaseline input, and provides 24 V to supply the ON/OFF switch on the Control console. This partof the board is fed by the low voltage power supplies through four fuses (F2, F3, F4, F5).When the generator is in standby, eight LEDs are lit (DS19, DS20, DS21, DS22, DS11, DS12,DS13 and DS14) if there is no fuse fault; DS15 is lit if there is no phase missing.The 24 V to supply the Control console switch is created from the -15 V and +15 V supplies,using a regulator which makes -15 V and +9 V.The three phases from the line input are measured on the Main Power Supply Board. Theresult signal _PH_ON is acquired on the Command 1 for treatment. If one single phase stays atzero volt during more than two cycles (32 ms for 60 Hz operation and 40 ms for 50 Hzoperation), then there are two consequences: If the system is OFF, it is not possible to power on the generator (DS15 is off). If the system is ON, the _MAIN_DROP signal is set to shut down the power inverters

(Rotor Controller, Heater, Main Inverter), and to reset the CPU before the Low VoltagePower Supply disappears (this is maintained for 75 ms from the Main Power Supply).

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522 Power ON sequence

The aim of the power On/Off circuit is to sequence properly the power On and Off of the MPHsub-assemblies, so as to avoid any hazard on the power boards due to abnormal commands.

The On/Off circuit is driven by the following signals:

SYS_ON: return contact of the Control Console Switch. It initiates the On sequence andcommands directly the room distribution contactor CT1.

_POW_ON_PU_CTRL: CPU control signal of the generator contactor CT2 fordiagnostic purposes.

Hardware Command 1 Switch (IN1): shuts off the generator contactor from the frontpanel (for service use).

The On/Off circuit is controlled by the following signals:

_ON_ENABLE: this signal indicates that the DC voltage is less than 30 V. The ONsequence is enabled only if the DC level is under 30 V.

_PH_OK1: indicates that the 3-phase input voltage is correct.

_PH_OK: indicates that the Room Transformer is in normal condition (T < 125C) or(T < 257F).

The On/Off circuit drives the following signals:

_GEN_ON: commands the Main Power Supply relay which supplies the generatorcontactor CT2 coil.

PUMP_ON: commands the Main Power Supply relay which supplies 115 V ac to the tubehousing cooling systems.

PRE_ON: commands the PRE_ON relay to apply low voltage power supplies to otherboards through current resistors.

LV_ON: commands the ON relay to apply low voltage power supplies directly to theother boards.

Note 1: A thermal switch is built into the Room Distribution Transformer to remove power fromthe generator in the event of an overload. The thermostat is triggered if the transformertemperature reaches 125C.

Note 2: A console presence signal prevents application of power if the console plug is notconnected.

Note 3: An ON/OFF button, located on Distribution Board MPH A6A3, can be used by the FieldEngineer.

The ON sequence is as follows (refer to Illustration 13, MPH On Sequence): Supply the Room Distribution Panel (CT1 contactor command _SYS_ON). Power applied through current limiting resistors (R280, R281, R282, R283) to electronic

boards (PRE_ON signal). Power applied directly to electronic boards (BT_ON signal and X6 relay) and to the tube

housing cooling systems (_PUMP_ON signal). Drive the main generator contactor CT1 on (_GEN_ON signal).

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ILLUSTRATION 13MPH ON SEQUENCE

When the generator is ON, the following front panel green LEDs are lit:

On Command 1 Board:

DS19, DS20, DS21, DS22, DS11, DS12, DS13 and DS14 indicate correct operationof the low voltage power supplies and fuses.

DS15 indicates a normal 3-phase condition.

DS16, DS17, and DS18 indicate low voltage supply to other boards.

On Command 2 Board:

DS6, DS7, DS8 and DS9 indicate low voltage supplies on the Command 2 Board.

DS2 indicates that the 15 V, +5 V, +24 V levels are correct.

On PU_CTRL_CPU Board:

DP5 V, DP15 V, DM15 V, DS8, DS9, and DS10 indicate low voltage supply of thePU_CTRL_CPU Board.

On ROOM_IF_CPU Board:

DS3, DS5, and DS4 indicate low voltage supply of the ROOM_IF_CPU Board.

523 Power OFF sequence

The OFF sequence is as follows (refer to Illustration 14, MPH Off Sequence): Switch off the room distribution (_SYS_ON signal), the tube housing cooling system

(_PUMP_ON signal). Switch off direct dc supply to the electronic boards (LV_ON signal). This stops power

inverter commands without causing problems with the logic circuits.

Switch off the current-limited dc supply to the electronic boards (PRE_ON signal). Switch off Contactor CT2.

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ILLUSTRATION 14OFF SEQUENCE

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ILLUSTRATION 15MAIN POWER SUPPLY BOARD: CONTACTORS, POWER-ON, AND AC-DC CONTROL

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53 Main Power Supply Contactors and Power Control

Refer to Illustration 15 (Main Power Supply Board: Contactors, Power-on, and AC-DCControl).

531 LV Power Supplies DC supply

In standby mode, the Low Voltage Power Supplies are alive, so as to power part of theCommand 1 Board, and the Main Power Supply Board. When there is a line voltage drop, theMPH must react in order to shut off properly inverters; this requires the Low Voltage PowerSupplies to be maintained for at least 75 ms. This is done by the circuit described here:

The generator auto-transformer features an isolated 220 V winding. This voltage is rectifiedand filtered on the Main Power Supply Board by a diode bridge and aluminum capacitors. TheLow Voltage Power Supplies are fed directly by this 310 V dc voltage.

When the MPH is in standby mode, this circuit is running. The 310 V dc is present on the MainPower Supply Board, indicated by DS12 warning neon.

When the MPH is driven OFF, the maintain capacitors are discharged through resistor R85.Disappearance of the DS12 light indicates full discharge.

532 Contactors power on

The MPH includes two contactors, one in the Room Distribution Panel, the other on theCabinet Rear Panel. These contactors are driven by 220 V (for 50 Hz operation) or 240 V (for60 Hz operation), controlled by 12 V or 24 V relays on the Main Power Supply Board. Thepresence of the 220/240 V is indicated by DS10 neon.

Three relays on the Main Power Supply Board are driven during the ON/OFF sequence:

X1 is energized by _SYS_ON signal from the Command 1 Board. It drives the openingor the closure of CT1, the room distribution contactor.

X2 is energized by _GEN_ON signal from the Command 1 Board. It drives the openingor the closure of CT2, the generator contactor.

X3 is energized by _PUMP_ON signal from the Command 1 Board. It supplies theselected tube housing cooling system with 115 V ac. This 115 V ac is indicated by DS5neon.

When these relays are energized, DS6, DS11, and DS12 yellow LEDs are lit.

533 AC power control

The check of the three phases is shared between the Command 1 Board and the Main PowerSupply Board. On this last board, the three phases are measured two by two, this measure isisolated by two transformers. The obtained voltages are then rectified and compared to areference level, in order to detect phase loss. See Illustration 16 (Phase Loss Detection). Theinformation is sent to the Command 1 Board for processing.

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ILLUSTRATION 16PHASE LOSS DETECTION

534 DC power control

The dc power supply is generated on the DC Filter Board. This dc level is measured on theboard by a resistive bridge, and compared to different levels on the Main Power Supply Board.

The dc measurement circuit on the Main Power Supply Board includes:

Five comparators which define seven dc ranges.

An encoder.

An optic coupler on each of the output signals.

Note: Since this circuit is at line potential, it is supplied through an isolated DC/DC converter(U2). When the MPH is in standby mode, it is supplied by an isolated 15 V supply,indicated by green LEDs DS3 and DS4. When the generator contactor is switched on, thedc level rises to its nominal value (between 480 V and 750 V), and green LEDs DS1 andDS2 are lit. The optic couplers allow isolation between the line potential level andCommand 1 ground level.

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The seven DC ranges are defined as follows:

Range/Signal _ON_ENABLE MEAS_DC_BUS1 MEAS_DC_BUS0 _OK_DC_BUS

E < 30 V 0 0 0 1

30 V < E < 400 V 1 0 0 1

400 V < E < 480 V 1 0 0 0

480 V < E < 557 V 1 0 1 0

557 V < E < 646 V 1 1 0 0

646 V < E < 762 V 1 1 1 0

762 V < E 1 1 1 1

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ILLUSTRATION 17DC POWER SUPPLY

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54 DC Power Supply generation

Refer to Illustration 17 (DC Power Supply).The dc supply for the three MPH DC/AC inverters (kV Rotor and Heater) is generated by theDC Filter Board. The ac line voltage supplies this board through three 100 A fuses (F1, F2,F3). It is rectified by a diode bridge underneath the board and filtered by capacitors.The outputs are fed to:

The main MPH 80 kW inverter, through the air inductances.

Rotor Control Board, through a 15 Amps fuse (F4). Heater Board, through a 3 Amps fuse (F5).The DC level is measured by a resistive divider at the far end of the power line (after the fuses)so as to ensure the right diagnosis if the fuse blows.

The filter discharge is made by a 2.7 k resistor, which is applied to the capacitors when thegenerator contactor is commanded OFF, by the auxiliary contact of CT2.

The presence of the DC level is indicated on the DC Filter Board by neon DS1.

55 Power Supply-related Error Codes

Power supply signals status are tested each 10 ms. If an error is detected, the correspondingerror code (see below) is sent to the APPLICATION task.


420 MAIN_DROP MAIN_DROP signal reset detection

410 DC_BUS_ERROR DC_BUS_FAULT (DC_BUS < 400V) signal status error411 FPS_ERROR FPS_FAULT signal; status error

412 LV_SUPPLY_ERROR LV_ENABLE (low voltage status) signal; status error

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SECTION 6ROTOR CONTROLLER FUNCTION

61 Introduction

Refer to Illustration 18 (Rotor Controller Function).The MPH Rotor Controller function involves the following sub-assemblies: PUCTRL Board: ROOM_IF_CPU in Extension Rack command interface and rotor

sequence control.

Command 2 Board: Rotor Controller Inverter command and control, inverter protection. Rotor Control Board: Rotor Controller Inverter power board and stator selection. Stators, Tube #1 and Tube #2.The main features of the MPH Rotor Control function are:

Low Speed 60 Hz (3600 rpm) and High Speed 180 Hz (10800 rpm) commands. For GeTube or 50 Hz or 150 Mz for CGR Tube.

No TIRC. The Rotor Controller is a PWB assembly. Two tubes with 23/23 (Ge) stator or two tubes with 50/110 (CGR) stator. The two stator

types cannot be mixed. Current check through the stator connection to insure rotor rotation. Inverter maximum current protection against short circuit.

Firmware thermal protection of the MPH Rotor Controller inverter. Extensive Diagnostics of Rotor Controller function. All InSite compatible.

62 Rotor Function Sequencing

At the system level, the sequence is as follows:

ROOM_IF_CPU sends an exposure sequence start signal to PU_CTRL_CPU, which setsrotor speed and rotation commands.

PU_CTRL_CPU reads the acceleration or braking time for selected tube from thedatabase, according to tube rotor type. Timing for an MX100 x-ray tube is as follows:

ACCELERATION BRAKING

0 to LS 0 to HS LS to HS HS to LS HS to 0 LS to 0

0.8 sec 1.2 sec 0.8 sec 0.85 sec 6.0 sec 2.0 sec

For other tubes, see Service Manual.

The ROTOR task updates the rotor state machine and sets rotor command signals. It setsappropriate time delays to accelerate or brake the rotor and to wait for rotor signal statussignals.

The sequence at generator level is described below. Refer to Illustration 19 (Rotor ControllerSequences Timing for a Stator 23/23).

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The various signals involved in the rotor function are shared by the PU_CTRL_CPU Boardand the Command 2 Board. The PU_CTRL_CPU controls the sequence with transitions onthe command signals (RUN_ROTOR, HI_SPEED, ACCEL and BRAKE), and checks thatthe returns are correct (CUR_START_ON, _LS_RTN). These signals are: RUN_ROTOR: When active (high), it commands the start of the rotor controller. HI_SPEED: When active (high), the rotor controller is driven in High Speed mode, when

not active (low), the Low Speed mode is selected. ACCEL: When active (high), the rotor controller is driven in Acceleration mode, when

Low, the running mode is selected.

BRAKE: When active (high), the rotor controller is driven in Brake mode. CUR_START_ON: Return from the Command 2 Board. When active (high), indicates

that there is some current flowing through the stator winding. It is checked by the CPUat different times during the sequence (see illustration).

_LS_RTN: Return from Rotor Control Board. When active (low), indicates that theCommand 2 Board has selected Low Speed. When not active (high), indicates that HighSpeed is selected. It is checked by the PU_CTRL_CPU at different times during thesequence (see illustration).

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ILLUSTRATION 19ROTOR CONTROLLER SEQUENCES

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63 Rotor Controller Command

Refer to Illustration 110 (Command 2 Board Block Diagram Rotor Controller).The principle of the Rotor Controller Inverter function stems from the Pulse WidthModulation (PWM) of the IGBT commands. In contrast to the other MPH inverters, there isno regulation loop in the Rotor Controller function. This means that there is no measurementfeedback to adapt the command to a reference. Most functions are supported by an EPLDwhich manages the PWM and inverter safety checks.The PWM command allows a choice of rotor speed, by driving the Rotor Controller with asine wave current at 60 Hz or 50 Hz in low speed mode (3600 rpm), or at 180 Hz or 150 Hz inhigh speed mode (10800 rpm). The Brake mode is obtained with a high frequency commandof the rotor controller inverter (at 1.4 kHz) which generates a DC current in the stator windings(no brake for CGR Tube).

631 Rotor controller: Command 2 EPLD

The Command 2 Rotor controller EPLD has several functions: Receive commands from the CPU. There are four commands: RUN_ROTOR (start

commands), ACCEL (Acceleration mode selection), BRAKE (Brake mode selection),HI_SPEED (High or Low speed selection).

Receive dc measurements from the Command 1 Board. The dc range specified byBUS_DC_MEAS0 and BUS_DC_MEAS1 conditions the pulse width of the IGBTcommands. The greater the DC level, the shorter the pulses.

Receive safety signals to protect the Rotor Controller Inverter: Maximum currentdetection in the inverter protects it against short circuits (START_CUR_MONIT_A/B),minimum and maximum dc level check (_DC_BUS_EN).

Receive type of stator to drive (2323 or 50110 ohms) by STATOR 2323 signal of CPUBoard. A choise of IGBT commands and the maximum current level safety is made forthe two types of stator.

Generate IGBT commands. These commands are driven by two state machines whichtakes into account the CPU commands, the DC level and the safety signals.

Drive the HIGH_SPEED selection relay, as a function of the speed selection mode. Inform the CPU of rotor controller status: the running mode is described by the

_CUR_START_ON signal, the safety mode is described by the _START_OVL signal.632 IGBT command drivers

There are twelve IGBT drivers; six ON commands, six OFF commands. All these commandsare driven by the EPLD and controlled by the LV_ENABLE signal. This control disables thecommands when the low voltage supplies drop under certain limits, with a complete hardwarecheck after the EPLD and the buffers. This system insures that even if the EPLD program failsdue to a low voltage fault, there should be no possibility of damaging the Rotor Controllerinverter because of a short circuit command.

633 Phase measurements and maximum current detection

In order to be sure that the tube rotor is rotating, two phases of the stator current are measuredon the Rotor Control Board. The third phase is rebuilt on the Command 2 Board, by assumingthat the sum of the phase currents is equal to zero. Each phase current is filtered and comparedto a reference current corresponding to 0.2 Amps. This result is read by the EPLD which usesit to generate the _CUR_START_ON signal, indicating that there is some current flowingthrough the selected stator. This status is indicated by yellow LED DS4.

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The dc current flow from the Rotor Control Board to the DC Filter Board is also measured, todetect inverter short circuits and protect the IGBTs. This measurement, made on the RotorControl Board, is compared to a reference value on the Command 2 Board, to generate a safetysignal (START_OVL) corresponding to 50 A in the inverter. When this condition appears, asignal is set to inform the CPU and a red LED (DS3) is lit.

634 High Speed capacitors selection

The MPH Rotor Controller requires a phase shift depending on the 60 Hz/180 Hz or50/150 Hz command. This is done on the Rotor Control Board by a relay which connectscapacitors between the inverter and the stator on the auxiliary and main phases. The commandsignal for this relay is indicated on the Command 2 Board by yellow LED DS5. When thisLED is lit, this means that the Rotor Controller is in Low Speed mode. One contact of the relayprovides a signal which is returned directly to the CPU to acknowledge the command of theRotor Controller High Speed or Low Speed Mode. (Different capacitors are used for the23/23 (GE) and 50/110 (CGR) stators.)

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PU_CTRL_ CPU Tube safeties (70 C C)/40

TO CHILLER

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64 Rotor Controller Power Inverter

Refer to Illustration 111 (Rotor Control Board Block Diagram).The last item in the MPH rotor controller function is the Rotor Control Board. This is a powerboard driven by the Command 2 Board, and consists mainly of an inverter and related currentmeasurement circuits.

641 Rotor controller inverter

Since the tube stator is a bi-phase type, the ROTCTL inverter is a three-leg inverter with sixIGBTs. Each of the six IGBT drivers consists of an impulse transformer (three windings1:3:3) and zener diodes. There is no floating power supply to generate the IGBT commands.The inverter itself is fed by the dc supply from the DC Filter Board, between 400 V dc to680 V dc nominal values. The presence of this voltage on Rotor Control Board is indicated byneon DS1. The dc voltage is changed to ac voltages between the three phases by the PWMcommands from the Command 2 Board. The main and auxiliary phases pass through the highspeed selection relay and the tube selection relay before reaching the stator. The commonphase is directly connected to the stators permanently.

642 Current measurements

Three currents are measured on Rotor Control Board:

Main and Auxiliary currents are measured by two current transformers (ratio 150:1) inorder to identify whether there is any current flowing though the stator (the commonphase is calculated on the Command 2 Board from the two phases already measured).

The current flow from the DC Supply Board is measured by a current transformer(ratio 1:1) in order to identify an inverter short circuit. If this occurs, the stator currentsare shorted by the inverter short circuit and it is not possible to measure them using themain and auxiliary current transformers.

643 High Speed capacitors

In High Speed mode, two capacitors are connected between the inverter and the stator, in orderto modify the angle between the phase voltages. The selection is made by a relay driven by theCommand 2 Board rotor EPLD. A contact of this relay is used to give an acknowledgementstatus signal, which is returned to the CPU. When the rotor is driven in Low Speed mode, therelay is energized, and yellow LED DS2 is lit. The position of the capacitors between theinverter and the tube is shown in Illustration 112 (High Speed Capacitors for stator GE(23/23)).

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ILLUSTRATION 112HIGH SPEED CAPACITORS FOR STATOR GE (23/23)

644 Tube housing cooling

The tube housing cooling ac power supply is generated in the MPH by the generatorauto-transformer, and connected to the casings through the Main Power Supply Board andRotor Control Board. This voltage is 115 V ac; its presence is signalled on the Rotor ControlBoard by neon DS6. It is switched to one tube or the other by the same tube selection relay asthe rotor controller inverter outputs.

In the case of a water-cooled tube, the Chiller Board (option) is installed on the generator doorbeside the low-voltage power supplies. The Board controls the power supply to an externalchiller which initiates tube cooling. During chiller operation, the DS1 or DS2 indicator lampon the Chiller Board is lit, and water circulation information is sent to the CPU via the Rotorand Command 2 Chiller Boards.

65 Rotor Controller Error Handling

When no exposure is in progress, rotor status signals are tested every 10 ms. If an error isdetected, the corresponding error signal, HE_ROTOR, is generated to the APPLICATIONtask.

During an exposure, status signals that must change are not tested for 200 ms after a newcommand. All other status signals are tested every 10 ms. If an error is detected, thecorresponding error code is sent to the APPLICATION task. The error code depends on thesignal and on the state of the rotor when the error was generated.

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720 CUR_ST_HS_ACC CUR_START_ON (current in rotor controller circuit) signal;status error while accelerating to high speed.

721 CUR_ST_HS_RUN CUR_START_ON (current in rotor controller circuit) signal;status error while rotor running in high speed.

722 CUR_ST_HS_BR CUR_START_ON (current in rotor controller circuit) signal;status error while braking from high speed.

723 CUR_ST_LS_ACC CUR_START_ON (current in rotor controller circuit) signal;status error while accelerating to low speed.

724 CUR_ST_LS_RUN CUR_START_ON (current in rotor controller circuit) signal;status error while rotor running in low speed.

725 CUR_ST_LS_BR CUR_START_ON (current in rotor controller circuit) signal;status error while braking from low speed.

710 ST_OVL_HS_ACC START_OVL (over current in rotor controller circuit) signal;status error while accelerating to high speed

711 ST_OVL_HS_RUN START_OVL (over current in rotor controller circuit) signal;status error while rotor running in high speed.

712 ST_OVL_HS_BR START_OVL (over current in rotor controller circuit) signal;status error while braking from high speed.

713 ST_OVL_LS_ACC START_OVL (over current in rotor controller circuit) signal;status error while accelerating to low speed.

714 ST_OVL_LS_RUN START_OVL (over current in rotor controller circuit) signal;status error while rotor running in low speed.

717 ST_OVL_LS_BR START_OVL (over current in rotor controller circuit) signal;status error while braking from low speed.

718 LS_RTN_ERR LS_RTN (low speed selection status) status signal error.726 HE_ROTOR Rotor status signal error while rotor not activated

507 ROT_CMD_TUB_CH New rotor command while tube changing

719 THERM_ROT Maximum rotor thermal value reached

66 Rotor Controller Thermal Protection

Rotor inverter thermal status is calculated every 10 ms. If the maximum value is reached, anerror message is sent to the display.

After a reset, the last recorded values of rotor thermal status are updated with elapsed time.

When Rad preparation is requested by the user, the rotor margin (capacity of rotor inverter toexecute the next rotor acceleration and brake sequence) is calculated.If the next sequence cannot be executed because of a thermal error, the rotor command isdelayed, and the green Prep lamp on Control Console flashes.

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ILLUSTRATION 113HEATER FUNCTION

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SECTION 7HEATER FUNCTION

71 Introduction

Refer to Illustration 113 (Heater Function).The MPH Heater function involves the following sub-assemblies: ROOM_IF_CPU: Sends radiography and fluoroscopy preparation commands. PU_CTRL_CPU Board: Heater sequence control. Command 2 Board: Heater Inverters (XS and XL) command and control, inverter

protection. Heater Board: Heater inverters and tube selection relays. HV Tank: Heater transformers

(XS Tube1, XL Tube 1, XS Tube 2, XL Tube 2). Tube #1 and Tube #2 filaments.The main features of the MPH Heater function are: Two independent inverters: One for Small Focus XS, one for Large Focus XL. Maximum Current up to 10 A in Boost Mode. RMS filament current value instantaneous regulation. Filament protection against maximum currents. Open filament detection. Heater inverters protection against maximum currents. Extensive diagnostics of the Heater function. All InSite compatible.

72 Heater Function Sequencing

Sequencing of the Heater function is controlled by the CPU. Depending on the required mA,CPU drive the heater current reference. The sequence of the commands between CPU and theCommand 2 Boards is shown in Illustration 114 (Heater Sequence). ROOM_IF_CPU sends an exposure start signal to PU_CTRL_CPU which sets heater

commands: OFF, pre-heat, acquisition, boost. The APPLICATION task sends commands to the HEATER task. This updates the heater

state machine for the corresponding focus, and sets the heater command signals.The definition of the signals is: RUN_HEAT_XS (or XL): instructs the Command 2 Board to drive the Heater inverter

XS (or XL). SET_HEATER_XS (or XL): analog reference value for the XS (or XL) heater current. _PRE_HEAT: sets the selected focus to pre-heat mode. BOOST: sets the selected focus to Boost mode. XS: selects the focus (XS or XL). _PRESENCE_XS (resp XL): indicates to the CPU that the corresponding focus is

normally driven.

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Documents

77193076 MPH Advanced Service Manual