6.3 If an Alarm Code Appears on the LED Monitor
6-23
[ 33 ] 0H4 Motor protection (PTC/NTC thermistor)
Phenomenon: Temperature of the motor has risen abnormally.
(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.
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/NTC
thermistor is not adequate.
Check thermistor Mode selection (H26*) and the select switches (SW5)
of terminal [V2].
➔ Set an appropriate value for H26* for the thermistor being used, and
set SW5 to the PTC/NTC 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/NTC thermistor is not used, the thermistor Mode
selection (H26*) is set to the operation state.
➔ Set the H26* data to “0” (Disable).
The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".
[ 34 ] 0H6 Charging resistor overheat
Phenomenon: Temperature of the charging resistor inside the inverter has risen abnormally.
(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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