Operating Instructions

Fault Codes
Digital Keypad
346 | 443
Action time
Pr.14-76
Fault treatment parameter
Pr.14-74
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.14-74=1 or 3, ot3 is a “Warning”. The warning is automatically cleared when
the output current < Pr.14-75.
Manual
When Pr.14-74=2 or 4, ot3 is a “Fault”. You must reset manually.
Reset condition
Immediately reset
Record
Pr.14-74=2 or 4, ot3 is a “Fault”, and the fault is recorded.
Cause
Corrective Actions
Incorrect parameter setting
Reset Pr.14-75 and Pr.14-76
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 for Pr.01-12–Pr.01-19 (accel./ decel. time)
V/F voltage is too high
Adjust the V/F curve (Motor 3, Pr.01-54–01-61), 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).
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 (See Pr.07-73 torque compensation gain) until the current
reduces and the motor does not stall.
Improper parameter settings for speed
tracking function (including restart after
momentary power loss and restart after
fault)
1. Correct the parameter settings for speed tracking.
2. Start the speed tracking function.
3. Adjust the maximum current for Pr.07-09 speed tracking.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
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 level
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