Rockwell Automation Publication 20P-TG002B-EN-P - February 2018 123
Flow Charts Appendix C
Field Current Loss Failure
The charts below presents the steps in flow chart form for troubleshooting a
Field Current Loss fault (F6).
No Field Current
Measure the voltage
at terminals U1, V1.
Is the correct
voltage present at
U1, V1?
Verify the wiring and
power source to U1, V1
and correct any problems.
No
Remove AC power
and remove and test
the fuses (FU1, FV1) at
the bottom of the drive.
Are the fuses
blown?
Test the resistance of
the motor eld wiring
and motor eld
for short circuits.
No
Yes
Yes
Are the terminals
short circuited?
Are the
fuses blown?
Yes
Measure the gate
signals at pins XR-1
and XR-2 on the cable.
Are the
signals present
and correct?
No
Yes
Replace the
control board.
Disconnect the cable from XR on the
control board and measure the U1-V1
voltage synchronization signal
at pin 11 on the cable. This signal
should be a square wave signal
with a 90° lag phase displacement
compared to the AC voltage signal.
Repair short circuits.
Yes
Check the eld SCR/dual
diode module for a
short circuit condition.
No
Does a short
circuit condition
exist?
No
Yes
Replace the SCR/
dual diode module.
Replace the eld
fuses at FU1 and FV1
and apply power
to the drive.
Replace the
eld board.
No
Replace the
control board.
Replace the
eld board.
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