Chapter 14 Fault Codes and DescriptionsME300
14-9
Cause Corrective Actions
Hardware failure
Wait for 10 minutes, and then cycle the power. Check if tH1o protection still
exists. If yes, return to the factory for repair.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
21
Overload
(oL)
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.
Action and Reset
Action level Based on overload curve and derating curve (Pr.06-55)
Action time
When the load is higher than the protection level and exceeds allowable time,
the oL protection activates.
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 and the working
cycle are too short.
Increase the setting values 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 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.
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 gain)
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.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
22
Electronic thermal
relay 1 protection
(EoL1)
Electronic thermal relay 1 protection. The drive coasts
to stop once it activates.
Action and Reset
Action level Start counting when output current > 150% of motor 1 rated current.
Action time
Pr.06-14 (if the output current is larger than 105% of motor 1 rated current again
within 60 sec., the counting time reduces and is less than Pr.06-14.)
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset in 5 sec. after the fault is cleared.
Record Yes
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