Operating Instructions

Fault Codes
Digital Keypad
320 | 443
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
26
Over torque 1 (ot1)
When the 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 level
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
Reset condition
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.
Record
Immediately reset
Active level
When Pr.06-06=2 or 4, ot1 is a “Fault”, and the fault is recorded.
Cause
Corrective Actions
Incorrect parameter setting
Configure the settings for Pr.06-07 and Pr.06-08 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 1, Pr.01-01–01-08), 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.07-26 torque compensation gain) until the current
reduces and the motor does no stall.
Improper parameter settings for speed
tracking function (including restart after
momentary power loss and restart after
fault)
● Correct the parameter settings for speed tracking.
● Start the speed tracking function.
● Adjust the maximum current for Pr.07-09 speed tracking.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
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 level
Pr.06-10