Instruction Manual ZS100T, ZS150T & ZS200T Series II (MAM-870) Senator Industrial Air Compressors
15
unit, drain the compressed air, and top up with additional oil as required.
g.
If any abnormal condition is found, the ‘OFF’ button or ‘Emergency Stop’ button
should be pressed immediately. Only restart the unit after rectifying the problem.
3.2.2 Operation Status of Compressor
Start
After all preparations are completed, press the starting button. The contactor in the
electrical cabinet will be closed to start the motor. At this point, the throttle in the inlet
valve will be closed, and only a low volume of air enters into the compressor through the
check valve in the inlet valve. The compressor will be started at light load and the
preliminary system pressure will be established gradually in the oil-air tank.
Load
About 6-7 seconds after starting, the solenoid valve in the inlet valve will act to fully open
the inlet valve, so that a high volume of air will enter into the compressor which will turn to
the full load operation. If the pressure (system pressure) inside the oil separation tank
reaches or exceeds 0.35 MPa, the minimum pressure valve will open and the unit will start
to supply the air to the exterior. As long as the system pressure is below the setting of
unloading pressure, such a state will be kept.
Unload
If the air consumption is continuously below the air discharge, the discharge pressure of the
unit will reach or exceed the setting of unloading pressure. At this point, the
micro-computer controller will control the solenoid valve. Then the throttle of inlet valve
is closed to stop the air input in a high volume. Only a low volume of air can enter into the
compressor through the check valve. The check valve spool of minimum pressure valve
will be closed to isolate the compressor system from the pipeline of the user. At the same
time, the vent valve will open to release the compressed air in the oil separation tank to
0.2-0.3 MPa. It will reduce the operating back pressure of the compressor and maintain
the circulation of lubricating oil in the oil circuit system.
In the unloading operation state, if the discharge pressure reduces to the setting of loading
pressure, the micro-computer controller will control the solenoid valve. Then the throttle
of inlet valve will open again and the vent valve will be closed. The unit will return to the
loading operation state.
If the unit fails to unload at the correct system pressure as a part of unloading control is
faulty or the setting is improper, it may cause the safety valve installed in the oil separation
tank to trip for the system pressure relief, avoiding any hazards due to excessively high
system pressure. If this occurs, immediately shut down the unit and check the inlet valve
and controller for their correct setting.
Summary of Contents for MAM-870
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Page 41: ...INSTRUCTION MANUAL MAM 870 COMPRESSOR CONTROLLER...
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