Chapter 14 Fault Codes and DescriptionsC2000 Plus
ID* Display on LCD Keypad Fault Name Fault Descriptions
24_1
Motor overheating
(oH3) PTC
Motor overheating (PTC) (Pr.03-00 – Pr.03-02 =
when PTC input > Pr.06-30, the fault
according to Pr.06-29.
Action and Reset
Action condition PTC input value > Pr.06-30 setting (Default = 50%)
Fault treatment parameter
Pr.06-29
0: Warn and keep operation
1: Fault and ramp to stop
2: Fault and coast to stop
Reset method
When Pr.06-29 = 0, oH3 is a “Warning”. The “Warning” is automatically cleared.
When Pr.06-29 = 1 or 2, oH3 is a “Fault”. You must reset manually.
When Pr.06-29 = 1 or 2, oH3 is a “Fault”, and the fault is recorded.
Cause Corrective Actions
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 fault
Check the cooling system to make it work normally.
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
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
Check if the motor rated current
matches that on the motor
Reset to the correct motor rated current.
Check if the PTC is properly set
Check the connection between PTC thermistor and the heat protection.
Check if the setting for stall
Set the stall prevention to the proper value.
Unbalanced three-phase
Replace the motor.
Use remedies to reduce harmonics.
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