Delta MH300 Series - Page 819

Chapter 14 Fault CodesMH300
14-92
ID No. Display Fault Name Description
129
Over-torque 4
(ot4)
When the output current exceeds the over-torque
detection level (Pr.14-78) and exceeds over-
torque detection time (Pr.14-79), and when Pr.14-
77 is set to 2 or 4, the ot4 error displays.
Action and Reset
Action condition Pr.14-78
Action time Pr.14-79
Fault treatment parameter
Pr.14-77
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
Auto
When Pr.14-77=1 or 3, ot4 is a “Warning”. The warning is
automatically cleared when the output current < Pr.14-78.
Manual
When Pr.14-77=2 or 4, ot4 is a “Fault”. You must reset
manually.
Reset condition Immediately reset
Record Pr.14-77=2 or 4, ot4 is a “Fault”, and the fault is recorded.
Cause Corrective Actions
Incorrect parameter setting Configure the settings for Pr.14-78 and Pr.14-79 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–Pr.01-19 (accel. / decel. time)
V/F voltage is too high
Adjust the V/F curve (Motor 4, Pr.01-63–01-70), especially the setting
value for the mid-point voltage (if the mid-point voltage is set t
oo low, the
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.07-75 torque compensation
gain) until the current reduces and the motor does not stall.