Delta MS300 Series User Manual page 575

Chapter 14 Fault CodesMS300
ID Display on LCD Keypad
21
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
The load is too large
Accel./Decel. time or the working
cycle are too short
V/F voltage is too high
The capacity of the drive is too
small
Overload during low-speed
operation
Torque compensation is too large
Check if the setting for stall
prevention is correct.
Output phase loss
Improper parameter settings for
the speed tracking function
(including restart after momentary
power loss and restart after fault)
Fault Name
Over load
(oL)
Action and Reset
Based on overload curve and derating curve (refer to Section 9-7).
When the load is higher than the protection level and exceeds allowable time,
the oL protection activates.
N/A
Manual reset
Reset in five seconds after the fault is cleared
Yes
Reduce the load
Increase the setting value for Pr.01-12–01-19 (accel./decel. time)
Adjust the settings for Pr.01-01–01-08 (V/F curve), especially the setting value
for the mid-point voltage (if the mid-point voltage is set too low, the load
capacity decreases at low speed).
Refer to the V/F curve selection of Pr.01-43.
Replace the drive with a larger capacity model.
Reduce the load during low-speed operation.
Increase the drive capacity.
Decrease the carrier frequency of Pr.00-17.
Adjust the torque compensation (refer to Pr.07-26 Torque Compensation Gain)
until the output current reduces and the motor does not stall.
Set the stall prevention to the proper value.
Check the status of three-phase motor.
Check if the cable is broken or the screws are loose.
Correct the parameter settings for speed tracking.
Start the speed tracking function.
1.
Adjust the maximum current for Pr.07-09 speed tracking.
2.
566
Fault Descriptions
The AC motor drive detects excessive drive output
current.
Overload capacity:

Normal duty:
Sustains for one minute when the drive outputs
120% of the drive's rated output current.
Sustains for three seconds when the drive outputs
150% of the drive's rated output current.

Heavy duty:
Sustains for one minute when the drive outputs
150% of the drive's rated output current.
Sustains for three seconds when the drive outputs
200% of the drive's rated output current.
Corrective Actions