Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
27
Over torque 2
(ot2)
When the output current exceeds the over-torque
detection level (Pr.06-10) and exceeds over-
torque detection time (Pr.06-11), and when Pr.06-
09 is set to 2 or 4, the ot2 error displays.
Action and Reset
Action condition Pr.06-10
Action time Pr.06-11
Fault treatment parameter
Pr.06-09
0: No function
1: Continue operation after over-torque detection during constant speed
operation
2: Stop after over-torque detection during constant speed operation
3: Continue operation after over-torque detection during RUN
4: Stop after over-torque detection during RUN
Reset method
Reset condition
Auto
When Pr.06-09=1 or 3, ot2 is a “Warning”. The warning is
automatically cleared when the output current < (Pr.06-10 –
5%).
Manual
When Pr.06-09=2 or 4, ot2 is a “Fault”. You must reset manually.
Record Immediately reset
Active level When Pr.06-09=2 or 4, ot2 is a “Fault”, and the fault is recorded.
Cause Corrective Actions
Incorrect parameter setting Configure the settings for Pr.06-10 and Pr.06-11 again.
Mechanical failure (e.g. over-
torque, mechanical lock)
Remove the causes of malfunction.
The load is too large.
Reduce the load.
Replace the motor with a larger capacity model.
Accel. / Decel. time and
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 V/F curve (Motor 2, Pr.01-35–01-42), especially the setting
value for the mid-point voltage (if the mid-point voltage
load capacity decreases at low speed).
The motor capacity is too small Replace the motor with a larger capacity model.
Overload during low-speed
operation
Decrease low-speed operation time.
Increase the motor capacity.
Torque compensation is too
large
Adjust the torque compensation (refer to Pr.07-71 torque compensation
gain) until the current reduces and the motor does no stall.
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