5.3 Ishikawa Diagrams
Section 5: Troubleshooting
CV-6SLX User Manual
5-10
0101-8242-0, Rev. C
Ishikawa Diagram #7: Rail Undervoltage Fault
Ishikawa Diagram #8: HV Overcurrent Fault
Power Supply
Rail low:
Min. for 208 VAC = 220 VDC
Min. for 400 VAC = 427 VDC
Power Supply
Rail low – A1 HV Inverter PCB
TP24/TP26 = actual rail voltage
Consequence
Possible Causes
Rail Undervoltage LED
lights red
(see Table 6-12)
Blown IGBTs on A1
HV Inverter PCB
Mains
AC phase missing
AC mains input not correct or
low (phase-to phase, phase-
to-ground readings)
Rail to A3 HV Reg. PCB incorrect.
A3 TP29 to ref: 10V = 1000 VDC for
actual rail
Blown F3 fuse on A1
HV Inverter PCB
R1 misadjusted on A3 HV Regulator PCB.
TP85 to ref:
208 V = 2.2 VDC
400 V = 4.27 VDC
FPS
Mains
HV relay defective
HV relay control voltage missing.
J103 pin 6 = +24VDC
Power Supply
HV output cable
defective
Loose cables
Consequence
Possible Causes
HV Overcurrent LED
lights red
(see Table 6-13)
Fluctuating line voltage
Improper grounding
HV Ouptut PCB
defective
Incorrect mains input voltage
or phase missing
5-12)
5-13)
