7
、
Controller protection
1、 Motor protection
MAM-880 air compressor controller provides all-round protection functions of short-circuit, locking,
phase failure, overload, imbalance for motor.
Electronic
failure
Failure Display
Reason
Short
circuit
Display failure “HOST/FAN SHORT”
Short circuit or rated current is set by mistake
Blocked
Display failure “HOST/FAN BLOCK”
Too large load, bearing wear and other
mechanical failure
Overload
Display
failure
“HOST/FAN
OVER
CARRY”
Too large load, bearing wear and other
mechanical failure
Phase
failure
Display
failure
“HOST/FAN
LACK
PHASE”
Power supply, contactor and phase failure of
motor
Unbalance
Display failure “HOST/FAN UNBLANCE”
Poor contact of contactor, inside open-loop of
motor
2、 Gas Exhaust Over-temperature Protection
When the Air exhaust temperature is higher than the upper limit of set temperature, the controller would be
stopped ,The display will show “
HIGHT T
”.
3、 Non-reversing Protection of Air Compressor
When three-phase supply phase sequence connected to the air compressor is not the same with that set for
the controller, the on-site failure is displayed as “
PHASE REVERSAL
”, as a result, the controller cannot
start up the motor. Then just change any arbitrary two-phase power lines leading to check the rotation of
motor.
4、Overpressure Protection of Pressure Supply
When the gas exhaust pressure is higher than the upper limit of set pressure, the controller would be stopped
for warning, the on-site failure is displayed as “
HIGH P
”.
5、Malfunction Protection of Sensor
When pressure sensor or temperature sensor is disconnected, the controller would be stopped for warning.
the on-site failure is displayed as “
**SENSOR FAULT
”.
8
、
Removal of Common Failures
1、
Failures
Review
Shutdown caused by the external parts of controllers may be removed by inquiring the on-site failure or
historic failure, with the details shown as below:
Press Down button or Up button , to move the black scroll bar to “
RUN PARAMETER
” menu, then
press Enter button , the lower menu would be propped out:
