Operating Instructions

Fault Codes
Digital Keypad
303 | 443
Check for possible burnout or
aging insulation of the motor
Check the motor insulation value with megger. Replace the motor if the
insulation is poor.
The load is too large.
Check if the output current during the whole working process exceeds the
AC motor drive’s rated current. If yes, replace the AC motor drive with a
larger capacity model.
Impulsive change of the load
Reduce the load or increase the capacity of AC motor drive.
Use special motor or motor with
larger capacity than the drive
Check the motor capacity (the rated current on the motor’s nameplate
should ≤ the rated current of the drive)
Use ON/OFF controller of an
electromagnetic contactor at the
output (U/V/W) of the drive
Check the action timing of the contactor and Ensure it is not turned ON/OFF
when the drive outputs the voltage.
Cause
Corrective Actions
V/F curve setting error
Adjust the V/F curve setting and frequency/voltage. When the fault occurs,
and the frequency voltage is too high, reduce the voltage.
Torque compensation is too
large
Adjust the torque compensation (See Pr.07-26 torque compensation gain)
until the output current reduces and the motor does not stall.
Malfunction caused by
interference
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
The motor starts when in free
run
Enable the speed tracking during start-up of Pr.07-12.
Improper parameter settings for
the speed tracking function
(including restart after
momentary power loss and
restart after fault)
● Correct the parameter settings for speed tracking.
● Start the speed tracking function.
● Adjust the maximum current for Pr.07-09 speed tracking.
Incorrect combination of control
mode and used motor
Check the settings for Pr.00-11 control mode:
For IM, Pr.00-11=0, 1, 2, 3, 5
For PM, Pr.00-11=4, 6, or 7
The length of motor cable is too
long
Increase the AC motor drive’s capacity.
Install AC reactor(s) on the output side (U/V/W).
Hardware failure
The ocA occurs due to the short circuit or ground fault at the output side of
the drive.
Check for possible short circuits between terminals with the electric meter:
B1 corresponds to U, V and W; DC- corresponds to U, V and W;
corresponds to U, V and W.
If short circuit occurs, return to the factory for repair.
Check if the setting for stall
prevention is correct
Set the stall prevention to the proper value.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
2
Over-current during
deceleration (ocd)
Output current exceeds three times of the rated current during
deceleration.
When ocd occurs, the drive closes the gate of the output
immediately, the motor runs freely, and the display shows an ocd
error.
Action and Reset
Action level
300% of the rated current