Delta MS300 Series User Manual page 630

ID Display on LCD Keypad
128
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
Incorrect parameter setting
Mechanical failure (e.g. over-
torque, mechanical lock)
The load is too large
Accel./ Decel. time and working
cycle are too short
V/F voltage is too high
The motor capacity is too small
Overload during low-speed
operation
Torque compensation is too large
Improper parameter settings for
speed tracking function (including
restart after momentary power loss
and restart after fault)
Fault Name
Over-torque 3
(ot3)
Action and Reset
Pr.14-75
Pr.14-76
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
When Pr.14-74 = 1 or 3, ot3 is a "Warning". The warning is
Auto
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.
Immediately reset
Pr.14-74 = 2 or 4, ot3 is a "Fault", and the fault is recorded.
Reset Pr.14-75 and Pr.14-76
Remove the causes of malfunction.
Reduce the load.
Replace the motor with a larger capacity model.
Increase the setting for Pr.01-12–Pr.01-19 (accel./ decel. time)
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).
Replace the motor with a larger capacity model.
Decrease low-speed operation time.
Increase the motor capacity.
Adjust the torque compensation (refer to Pr.07-73 torque compensation gain)
until the current reduces and the motor does not stall.
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.
621
Fault Descriptions
When the output current exceeds the over-torque
detection level (Pr.14-75) and exceeds over-torque
detection time (Pr.14-76), and when Pr.14-74 is set to 2
or 4, the ot3 error displays.
Corrective Actions
Chapter 14 Fault CodesMS300