GE Brivo OEC 715, Service Manual

Page: 107 / 551

System Overview
2-53
Main
transformer
Rectifier
bridge
DC bus
capacitor
IGBT Board
AC
Monoblock
F
Q1
Q2
Q3
Q4
kV Control
board
Drive power
transformer
Resonant
circuit
L
D
C
R
Signals from MCB to KV control board are listed as follows.
Name Description Attribution Scale Comment
SAFETY_EN Safety line for EXPOSURE_COMMAND Digital 0/+15V +15V=enable
0V=disable
EXPOSURE_COMMAND Exposure command Digital 0/+15V +15V=enable
0V=disable
KV_SET_INPUT KV set value to KV control board Analog 0-6V Unit is 20KV/V
Signals from KV control board to MCB are listed as follows.
Name Description Attribution Scale Comment
KV_LOW_ALM KV too low alarm, lower than 35KV Digital 0/+15V 0V=alarm
KV_HIGH_ALM KV too High alarm, higher than 120KV Digital 0/+15V 0V=alarm
OVERCURRENT_ALM Inverter over current alarm Digital 0/+15V 0V=alarm
IGBT_ERROR_ALM IGBT error alarm Digital 0/+15V 0V=alarm
DC_ERROR_ALM DC Power Bus Error alarm Digital 0/+15V 0V=alarm
KV_UNBALANCE_ALM KV unbalance in two bridges of inverter. Digital 0/+15V 0V=alarm
KV_FEEDBACK_OUTPUT KV sample value from KV control board Analog 0-6V Unit 20KV/V
Test Point
Pin Description
TP1 +15V
TP2 Output A of SG3525
TP3 Output B of SG3525
TP4 The frequence of SG3525
TP5 GND
TP6 GND
TP7 +5V
TP8 -15V
TP9 GND
TP10 The current feedback of inverter output
TP11 The control voltage of KV PI
TP12 The control voltage of KV PI with inverter current
TP13 KV PI output
TP14 Midpoint of KV
TP15 KV feedback output