1. The motor insulation is 
damaged or the motor is 
overheated 
2. Grounding problem 
caused by damaged motor 
cable 
3.The drive is damaged 
4.The load is too heavy 
5. Settings for acceleration or 
deceleration time is too short 
6.The drive is running a 
special purpose motor or a 
motor larger than the drive 
rated capacity 
7. A magnetic contactor (MC) 
on the output side of the 
drive has turned on or off 
8. V/F set incorrectly   
9. Excessive torque 
compensation 
10. Electrical signal 
1. Check the insulation resistance 
2. Check the motor power cable   
3. Check the resistance between 
the cable and the terminal. 
4. Short circuit on drive output 
side or grounding causes 
register damage.   
5. >Measure the current flowing 
into the motor 
>Check the motor capacity 
6. Calculate the torque required 
during acceleration according to 
the load inertia and acceleration 
time. If the required torque is 
insufficient, check the motor 
capacity.   
7. Install a sequence controller to 
ensure the MC does not open or 
close when the drive is 
outputting voltage. 
8. Check the ratios between the 
frequency and voltage set by 
V/F. 
9. Adjust d1-02 to d1-11