Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
24_2
Motor overheating
(oH3) PT100
Motor overheating (PT100) (Pr.03-00–Pr.03-
01=11 PT100). When PT100 input > Pr.06-57
(default = 7 V), the fault treatment acts according
to Pr.06-29.
Action and Reset
Action condition 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: Fault and ramp to stop
2: Fault 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–Pr.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 PT100 is properly
set and wired.
Check connection of PT100 thermistor.
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