Delta MH300 Series - Page 762

Chapter 14 Fault CodesMH300
14-35
ID No. Display Fault Name Description
26
Over-torque 1
(ot1)
When output current exceeds the over-
torque
detection level (Pr.06-07) and exceeds over-
torque
detection time (Pr.06-08), and when Pr.06-
06 or
Pr.06-09 is set to 2 or 4, the ot1 error displays.
Action and Reset
Action condition Pr.06-07
Action time Pr.06-08
Fault treatment parameter
Pr.06-06
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.06-06=1 or 3, ot1 is a “Warning”. The warning is
automatically cleared when the output current < (Pr.06-07 –
5%).
Manual When Pr.06-06=2 or 4, ot1 is a “Fault”. You must reset manually.
Reset condition Immediately reset
Record When Pr.06-06=2 or 4, ot1 is a “Fault”, and the fault is recorded.
Cause Corrective Actions
Incorrect parameter setting Reset Pr.06-07 and 06-08.
Mechanical error (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 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 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.07-26 torque c
ompensation
gain) until the current reduces and the motor does no stall.