Chapter 14 Fault Codes and DescriptionsC2000 Plus
ID* Display on LCD Keypad Fault Name Fault Descriptions
21
Over load (oL)
The AC
motor drive detects excessive drive output
current. The overload capacity sustains for
when the drive outputs 120% of the drive’s
current.
Action and Reset
Action condition Based on over load curve and derating curve.
Action time
When the load is higher than the protection level and exceeds allowable
the oL protection occurs.
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
The load is too large Reduce the load
Accel./Decel. time or the working
cycle are too short
Increase the setting value for Pr.01-12–01-19 (accel./decel time)
V/F voltage is too high
Adjust the settings for Pr.01-01–01-08 (V/F curve), especially
for the mid-point voltage (if the mid-point voltage is set too low, the
decreases at low speed).
Refer to the V/F curve selection of Pr.01-43.
The capacity of the drive is too
small
Replace the drive with a larger capacity model.
Overload during low-speed
operation
Reduce the load during low-speed operation.
Increase the drive capacity.
Decrease the carrier frequency of Pr.00-17.
Torque compensation is too large
Adjust the torque compensation (refer to Pr. 07-26 Torque Compensation Ga
until the output current reduces and the motor does not stall.
Check if the setting for stall
prevention is correct.
Set the stall prevention to the proper value.
Output phase loss
Check the status of three-phase motor.
Check if the cable is broken or the screws are loose.
Improper parameter settings for
the speed tracking function
(including restart after momentary
power loss and restart after fault)
Correct the parameter settings for speed tracking.
1. Start the speed tracking function.
2. Adjust the maximum current for Pr.07-09 speed tracking.
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