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Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
Appendix C
Flow Charts
Control Power Supply Failure
This chart presents the steps for troubleshooting a Power Failure fault (F3).
Measure the
voltage at
terminals U2, V2.
Is the correct
voltage present at
U2, V2?
Replace the field
board.
Verify the wiring and
power source to U2,
V2 and correct any
problems.
No
Remove AC control
power and remove
and test the fuse (F1)
at the top of the drive.
Is the fuse blown?
Replace the switching
power supply board
and apply AC control
power.
No
Yes
Yes
Replace the fuse,
disconnect the cable
from connector XA on
the control board, and
apply AC control
power.
Is the fuse blown?
No
Is the drive
operational?
No
Yes
Use an ohmmeter to
verify that all terminals
on the control board
terminal blocks are
not short circuited.
Are terminals
short circuited?
No
Yes
Remove cable from
connector XR on
control board and
ohmmeter all voltage
testpoints and
commons to verify no
short circuits (values
should be > 200
kohm).
Repair short circuits.
Any values lower
than 200 kohm?
Replace the
control board
Yes
No
Remove cable from
connector XFCD on
the control board and
ohmmeter between
pins 1 and 2 and 3
and 2 on cable to
verify no short circuits
(values should be >
200 kohm).
Any values lower
than 200 kohms?
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.
Is the fuse blown?
No
Yes
Replace the
switching power
supply board.
Remove all power
from the drive.
Check all external
wiring to the pulse
transformer board,
including the motor
PTC if used for a short
circuit condition.
Any short circuits?
No
Yes
Replace the pulse
transformer board.
Replace the
control board.
No
Repair the short
circuits.