Delta MS300 Series User Manual page 557

Chapter 14 Fault CodesMS300
Cause
Malfunction caused by
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)
Incorrect combination of control
mode and used motor
The length of motor cable is too
long
Hardware failure
Check if the setting for stall
prevention is correct
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
Correct the parameter settings for speed tracking.
1. Start the speed tracking function.
2. Adjust the maximum current for Pr.07-09 speed tracking.
Check the settings for Pr.00-11 control mode:
1. For IM, Pr.00-11 = 0, 1, 2, 3, 5
2. For PM, Pr.00-11 = 4, 6, or 7
Increase the AC motor drive's capacity.
Install AC reactor(s) on the output side (U/V/W).
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.
Set the stall prevention to the proper value.
548
Corrective Actions