Manual

Diagnostics and Troubleshooting 9-3
Table 9.2 – Fault Codes and Corrective Actions
Display
Code
No. of Fault
LED Flashes Fault Description Fault Cause Corrective Action
CF 2 Control Input Illegal control input
sequence.
- 3-wire: Verify Start and Jog inputs
are not both ON.
- 2-wire: Verify that only one input
(Forward, Reverse, or Jog) is on.
FL 2 Function Loss Start attempt while STOP
(Function Loss) input is off.
Verify STOP (Function Loss) input is
ON before attempting to start drive.
LU 3
Under Voltage
1
1
Auto Resettable
- Low input line.
- Temporary loss of
input line.
Check input line to verify voltage is
within operating specifications.
HU 4
Over Voltage
1
- High input line.
- Decel time too fast.
- Overhauling load.
- Check input line to verify
voltage is within operating
specifications.
- Increase decel time.
dO 5
Drive Overload
1
Excessive driven load. Reduce the load.
OL 5
Motor Overload
1
Excessive driven load. - Verify P-02 is set correctly.
- Reduce the load.
OH 6
Over Temperature
1
- Operating environment
is too hot.
- Fan is blocked or not
operating.
- Excessive driven load.
- Verify the ambient
temperature is < 50°.
- Verify clearance above/ below
drive.
- Check for fan obstruction. Replace
fan if required.
- Reduce the carrier frequency (P-
64).
- Reduce the load.
OC 7
Over Current
1
(300%)
- Shaft rotation blocked.
- Excessive driven load.
- Output wiring is incorrect
or shorted.
- Check for obstructions to
shaft rotation or reduce
excessive load.
- Increase accel / decel time.
- Verify output wiring is correct.
CL 8 Bad Keypad Connection Bad connection from
keypad to drive.
Verify keypad is properly connected
to drive.
UF 9 Negative Slope Conflicting parameter
values.
Adjust values of parameters -P-50
through P-54.
J1 10 Ground Short Phase U - Verify output wiring is correct
- Verify output phase is not
grounded.
- Verify motor is not damaged.
J2 10 Phase V
J3 10 Phase W
J4 10 Phase to Phase Short Phase U - V - Verify output wiring is correct.
- Verify motor is not damaged.
J5 10 Phase U - W
J6 10 Phase V - W
CH 11 Checksum Failure Parameter value out of
range.
Load default parameter values (P-
60 =1), then cycle power. If fault
persists, replace drive.
UP 12 Microprocessor Fault Internal processor error. Cycle power. If fault persists,
replace drive.