Operating Instructions

Fault Codes
Digital Keypad
304 | 443
Action time
Immediately act
Fault treatment parameter
N/A
Reset method
Manual reset
Reset condition
Reset in five seconds after the fault is cleared
Record
Yes
Cause
Corrective Actions
Deceleration time too short
● Increase the deceleration time
● Increase the deceleration time of S-curve
● Set auto-acceleration and auto-deceleration parameter (Pr.01-44)
● Set over-current stall prevention function (Pr.06-03)
● Replace the drive with a larger capacity model
Check if the mechanical brake of the
motor activates too early
Check the action timing of the mechanical brake
Short-circuit at motor output due to poor
insulation wiring
Check the motor cable and remove causes of the short circuits, or replace the cable before turning
on the power.
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.
V/F curve setting error
Adjust the V/F curve settings 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 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 error
The ocd 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 circuits occurs, return to the factory for repair.
Check if the setting of stall prevention is
correct
Set the stall prevention to the proper value.