Motor protection (PTC thermistor)
Phenomena Temperature of the motor has risen abnormally.
Possible Causes Check and Measures
(1) The temperature around the
motor exceeded the motor's
mode range.
Measure the surrounding temperature.
Lower the temperature around the motor.
(2) Cooling system for the motor is
defective.
Check if the cooling system of the motor is operating normally.
Repair or replace the cooling system of the motor.
(3) Overload. Measure the inverter output current.
Reduce the load (e.g. Use the overload early warning (E34) and
reduce the load before the overload protection is activated.). In
winter, the load tends to increase.
Lower the temperature around the motor.
Increase the Carrier frequency (function code F26).
(4) The activation level (H27) of the
PTC thermistor for motor
overheat protection was set
inadequately.
Check the PTC thermistor modes and recalculate the detection voltage.
Modify the data of function code H27.
(5) The setting of the PTC
thermistor is not adequate.
Check thermistor Mode selection (H26, E59) and the changeover
switches (SW3, SW4) of terminal [C1].
Change the settings to E59=0, H26=1, and set SW3 to C1 side and
SW4 to PTC side.
(6) Excessive torque boost
specified (F09*)
Check whether decreasing the torque boost (F09*) does not stall the
motor.
If no stall occurs, decrease the F09* data.
(7) The V/f pattern did not match
the motor.
Check if the base frequency (F04*) and the rated voltage at base
frequency (F05*) match the rated values on the motor's nameplate.
Match the function code data with the values on the motor's
nameplate.
(8) Incorrect setting of function
code data.
Although PTC thermistor is not used, the thermistor Mode selection
(H26) is set to the operation state.
Set the H26 data to “0” (Disable).
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Charging resistor overheat
Phenomena Temperature of the charging resistor inside the inverter has risen abnormally.
Possible Causes Check and Measures
(1) The inverter power is turned ON
and OFF frequently.
Suppress the inverter power ON/OFF cycles.
Turn ON and OFF the inverter power once or less per 30 min.
(2) The inverter power is not turned
ON and OFF frequently.
Check that this alarm always occurs when the inverter power is turned
ON.
The charging circuit of the inverter is faulty. Consult your Fuji
Electric representative for repair.
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