Delta ME300 Series

Chapter 14 Fault Codes and Descriptions
ME300
14-43
No. Display on LED Keypad Fault Name Fault Descriptions
81
W-phase short circuit
(Coc)
W-phase short circuit detected when output wiring
detection is performed before the drive runs.
Action and Reset
Action condition 240% of the rated current
Action time Immediately act
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset in 5 sec. after the fault is cleared.
Record Yes
Cause Corrective Actions
Incorrect motor wiring
Check if the motor’s internal wiring and the UVW wiring of the drive output
terminal are correct.
Short-
circuit at motor output due to
poor insulation wiring.
Without considering the short circuits, check the motor cable
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 th
e motor if the insulation
is poor.
Malfunction caused by interference
Verify the wiring of the control circuit and 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 failure
The Coc occurs due to 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, W; DC- corresponds to U, V, W;
corresponds to U,
V, W.
If short circuits occur, return to the factory for repair.