Control Power Supply Failure Flow Chart - Allen-Bradley PowerFlex DC Hardware Service Manual

Appendix C Troubleshooting Flow Chart
Control Power Supply Failure
Flow Chart
Measure the
voltage at
terminals U2, V2.
Is the correct
No
voltage present at
U2, V2?
Yes
Remove AC control
power and remove
and test the fuses F1
and F2 (if present) at
the top of the drive.
No
Is a fuse blown?
Yes
Replace the fuse/fuses,
disconnect the cable
from connector XA on
the control board, and
apply AC control
power.
No
Is the fuse blown?
Yes
Remove power from
the drive and replace
the fuse on the
switching power
supply board.
Remove the switching
power supply board
from the drive.
Apply power to the
switching power
supply board only.
No
Is the fuse blown?
Yes
Replace the
switching power
supply board.
144
Verify the wiring and
power source to U2,
V2 and correct any
problems.
Replace the switching
power supply board
and apply AC control
power.
Use an ohmmeter to
verify that all terminals
Are terminals
on the control board
short circuited?
I/O terminal blocks
are not short circuited.
Repair short circuits.
Remove all power
from the drive.
Check all external
wiring to the pulse
transformer board,
Any short circuits?
including the motor
PTC if used for a short
circuit condition.
Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018
No
Is the drive Replace the
operational? control board
Remove cable from
connector XR on
control board and
ohmmeter all voltage
No
testpoints and
commons to verify no
short circuits (values
should be > 200
kohm).
Yes
No
Replace the pulse
transformer board.
Yes Repair the short
circuits.
No
Any values lower
than 200 kohm?
Yes
Replace the
control board.