Controller Protection; Motor Protection; Protection Of High Discharge Air Temperature; Protection Of Air Compressor Reversal - SCC MAM – 890 Operation Manual

7 Controller Protection

7.1 Motor Protection

MAM-860 air compressor controller provides overload, open phase, current unbalance, high voltage, low
voltage protection for motor and overload protection for fan.
Electronic Failure
Overload
Phase failure
Unbalance

7.2 Protection of High Discharge Air Temperature

When discharge air temperature is above the high limit of set temperature, the controller will send out the
alarm to shut down the machine. This fault displays HIGH T.

7.3 Protection of Air Compressor Reversal

When compressor stops and three phases sequence is not in order, this fault displays PHASE REVERSAL,
and the controller cannot star the motor. It is needed to check and alternate any two of the phase
sequence and investigate the motor rotation direction.

7.4 Protection of High Pressure

When the AIR P is above the STOP P, the controller will send out the alarm to shut down the machine. This
fault displays HIGH P

7.5 Protection of Sensor Failure

When pressure sensor or temperature sensor is disconnected, the controller will send out the alarm to
shut down the machine and this fault displays **SENSOR FAULT

7.6 Low Temperature Protection

When discharge air temperature is below LOW T PRO in manufacturing parameter, this fault displays P
SENSOR FAULT two minutes after compressor turns on, the controller will send out the alarm to shut down
the machine.
04.08.2017
Failure Display
Display "MOTOR/FAN OVERLOAD"
Display "MOTOR OPEN PHASE"
Display "MOTOR UNBALANCE"
Operation Manual MAM - 890 V1.0
Reason
Overload, bearing wear and other mechanical failure
Power supply, contactor and open phase of motor
Poor contact of contactor, inside open-loop of motor
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