output frequency of the inverter based on the current air outlet
temperature (detected by PT1 terminal) of the screw compressor and
the present control temperature so as to change intensity of heat
radiation and keep the air outlet temperature stable at the preset
temperature approximately. When the air outlet temperature is lower
than the “Fan stop temperature”, the controller stops the inverter and
the fun and will not restart them until the air outlet temperature rises to
the preset value.
The controller will detect the working current of the fan in real time.
Once continuous overload or lack phase occurs, it will give an alarm
and stop the fan.
5.5.4 Handling Abnormal Signals
1) When cable broken fault to pressure transmitter or cable
broken fault/short circuit to temperature sensor is detected, the
controller will stop and give an alarm. The system will not
restart until the sensor fault is cleared.
2) When the detected air outlet temperature exceeds the “Over
temperature stop threshold”, the controller will immediately
stop the screw compressor and give an alarm. When the air
outlet temperature exceeds the “Over temperature alarm
threshold” only, the controller gives an over temperature alarm.
3) When the detected air outlet pressure exceeds the “over
pressure stop threshold” or the “allowable top pressure”, the
controller will immediately stop the screw compressor and give
an over pressure alarm.
4) When the detected air outlet pressure exceeds the “Over
pressure stop threshold” or the “allowable top pressure”, the
controller will immediately stop the screw compressor and give
an over pressure alarm.
5) When the controller finds external “Emergency stop” signal is
effective, it will stop the inverter and closes all control outputs.
The system will not run until the “Emergency stop” signal is
released.
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