Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
24_1
Motor overheating
(oH3) PTC
Motor overheating (PTC) (Pr.03-00–Pr.03-01=6
PTC), when PTC input > Pr.06-30, the fault
treatment acts according to Pr.06-29.
Action and Reset
Action condition PTC input value > Pr.06-30 setting (Default = 50%)
Action time Immediately act
Fault treatment parameter
Pr.06-29
0: Warn and continue operation
1: Fault and ramp to stop
2: Fault and coast to stop
3: No warning
Reset method
When Pr.06-29=0, oH3 is a “Warning”. The “Warning”
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).
Check if the motor rated
current matches that on the
motor nameplate.
Reset to the correct motor rated current.
Check if the PTC is properly
set and wired.
Check the connection between PTC thermistor and the heat protection.
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