Gardner Denver Reavell 5236, Руководство по эксплуатации и техническому обслуживанию

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WARNING!
SUCTION UNLOADERS MUST ONLT BE USED BY HAND TO
SUPPLIMENT AUTOMATIC DDV SYSTEM AND RELEASED
IMMEDIATELY THE DDV'S ARE ACTIVATED TO LOAD COMPRESSOR.
FAILURE TO OBSERVE THIS PROCEDURE CAN LEAD TO
UNACCEPTABLE HIGH SECOND STAGE TEMPERATURES.
1.10 AUTOMATIC STOP/START CONTROL
On initial starting the compressor is unloaded by the diaphragm drain valves and first stage suction
unloaders. After approximately 10 seconds when full operational speed is reached the two PUV
solenoids for operating the DDV's and suction unloaders are energised and the compressor delivers
air normally. When the receiver pressure reaches the pre-determined setting, the pressure switch
signals the motor starter to stop and unload the compressor or, if a run-on timer if fitted, the
compressor will run in an unloaded condition for a period of ten minutes before being shut-down
automatically. If the low set point is reached during this period the compressor will come back onto
load.
1.11 INSTRUMENTATION
Pressure gauges are fitted to both stages, also an oil pressure gauge.
One temperature cut-out switch is fitted to the first stage delivery before cooling, another to the final
delivery after cooling. These monitor temperatures and provide a signal to the starter/control panel to
shutdown the compressor in the event of the set point being exceeded. High temperatures can result
from the effects of valve leakage and reduced water flow. Compressor temperature is monitoried by a
temperature switching gauge and a sensor fitted in the first stage air stream.