Operating Instructions

Fault Codes
Digital Keypad
319 | 443
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
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 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: 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.
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.