Fuji Electric FRENIC-HVAC User Manual page 27

 Motor protection by PTC thermistor
By connecting the Positive Temperature Coefficient (PTC) thermistor embedded in the motor to
the C1 pin, motor temperature is detected to protect the motor by shutting off the inverter before
the motor overheats. You can select whether to shut off the inverter (stop by alarm) or output
alarm from transistor output by PTC protection level.
PTC
thermistor
 Easy cooling fan replacement
Employs configuration that allows the fan to be mounted or dismounted by one simple operation
to facilitate cooling fan replacement. (For the detailed replacement procedure, refer to Chapter 10,
Section 10.6 "Cooling Fan Replacement Procedure.")
Cooling fan replacement procedure
Press knob inward.
Remove the cooling fan (with case).
<Control circuit>
Resistor
(Power level)
Disconnect
the connector.
Remove cooling fan cable (connector).
Remove and replace the fan case and
cooling fan.
1-11
1.1 Features
External
alarm
Lift carefully.