kV Generation
24V_INTERLOCK Positive 24V from Power/Motor Relay PCB A4P7/J7 to Power/Signal Interface PCB A11J8/P8 and from
A11P3/J3 to Battery Charger PCB A22J2/P2, then from A22P3/J3 to Backplane A1J4/P4, thence to HV
Supply Regulator PCB A1A1. Also from A11P10/J10 to Generator Driver PCB A2J2/P2 and from A2P5/J5
to Filament Driver PCB A21J1/P1. This signal is used to generate INTLK_CMPLT*.
Generator Driver PCB
XRAY_ON* Active low logic level controls X-ray pulse envelope.
XRAY_ENABLE* Active low logic level controls X-ray production.
KVP_DRV_A_TOP Opto-coupler drive signal for IGBT Q1 upper gate G1.
KVP_DRV_A_BTM Opto-coupler drive signal for IGBT Q1 lower gate G2.
KVP_DRV_B_TOP Opto-coupler drive signal for IGBT Q2 upper gate G1.
KVP_DRV_B_BTM Opto-coupler drive signal for IGBT Q2 lower gate G2.
KVP_DRV_RTN Opto-coupler return current path, enabled or disabled by faults.
SHUTDOWN Logic level signal active high, disables generator
ANALOG_RTN Analog direct ground return path for FIL_ERROR etc.
FAULT_RST Logic high clears all fault latches on Generator Driver & HVSR.
HV_GEN_ON* Logic level signal indicates presence of high voltage drive at tank
FAULT Active high logic level signal indicates a latched fault condition
OVER_KVP_FAULT Active high latched logic level signal indicates overvoltage
GND_INTEG* Active low logic level signal indicates ground connection to tank
OVERLD_FAULT Active high latched fault signal indicates overcurrent in HV transformer
SAT_FAULT Active high latched logic signal indicates excessive saturation voltage on IGBTs
INV_B_SEN Analog signal senses battery voltage on filament supply
INV_B_SEN_REF Analog ground reference for above, resistive termination
FLUX_SEN Analog signal representing kVp from flux in HV transformer.
FLUX_SEN_REF Analog ground reference via resistor for above.
+15V, POS_15V DC +15V power.
-15V, NEG_15V DC -15V power.
DC_COMMON Analog and Digital ground (2 lines). These may be removed to isolate a ground loop. Called GND on
Generator Driver PCB.
+5V, POS_5V DC +5V power.
24V_INTERLOCK DC +24V power via interlock relay (no longer used on PCB).
14
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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