Chapter 14 Fault Codes and DescriptionsME300
14-12
ID No. Display on LCM Keypad Fault Name Fault Descriptions
24_2
Motor overheating
(oH3) PT100
Motor overheating (PT100) (Pr.03-00=11 PT100).
When PT100 input > Pr.06-57 (default = 7 V), the fault
treatment acts according to Pr.06-29.
Action and Reset
Action level PT100 input value > Pr.06-57 setting (default = 7 V)
Action time Immediately act
Fault treatment parameter
Pr.06-29
0: Warn and continue operation
1: Warn and ramp to stop
2: Warn and coast to stop
3: No warning
Reset method
When Pr.06-29=0 and the temperature < Pr.06-56, oH3 is automatically cleared.
When Pr.06-29=1 or 2, oH3 is a “Fault”. You must reset manually
Reset condition Immediately reset
Record When Pr.06-29=1 or 2, oH3 is a “Fault”, and the fault is recorded.
Cause Corrective Actions
Motor shaft lock Remove the shaft lock.
The load is too large.
Reduce the load.
Increase the motor capacity.
Ambient temperature is too high.
Change the installed place If there are heating devices in the surroundings.
Install/ add cooling fan or air conditioner to lower the ambient temperature.
Motor cooling system error Check the cooling system to make it work normally.
Motor fan error Replace the fan
Operate at low-speed too long.
Decrease low-speed operation time.
Replace the motor with a dedicated to VFD model.
Increase the motor capacity.
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.
Check if the motor rated current
matches that on the motor
nameplate.
Reset to the correct motor rated current.
Check if the PT100 is properly set
and wired.
Check connection of PT100 thermistor.
Check if the setting for stall
prevention is correct.
Set the stall prevention to the proper value.
Unbalanced three-phase
impedance of the motor
Replace the motor.
Harmonics are too high. Use remedies to reduce harmonics.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
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 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
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
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