AirMan PDS185S-6C1, Руководство по обслуживанию

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1. Specification
1-12
1.6 Capacity Control Device
Step Response
Start
When starting operation, purge/starting unloader solenoid valve (SV1) opens.
And compressed air is sent to unloader chamber and speed regulator
chamber . The pressure in chamber rises soon, and unloader valve fully
closes due to low pressure. Thus the load required for starting is reduced.
Load operation
After starting operation, solenoid valve (SV1) closes after 10 seconds have
passed. The air volume sent to the chambers and from pressure
regulator increases or decreases according to the rise and drop of discharge air
pressure. Thus according as unloader valve position and engine speed change,
free air delivery is sleeplessly and automatically regulated from 0 to 100%.
Suction port closing
unload operation
When air consumption is reduced, and the pressure exceeds the rated one,
speed regulator functions to lower the engine speed in proportion to the
pressure rise and, at the same time, to close unloader valve.
Under unloaded operation, the interior of compressor air-end becomes vacuum
and vacuum noise is caused. In order to prevent occurrence of vacuum noise, it
functions to open the vacuum relief valve, detecting the secondary pressure of
pressure regulator and thus it prevents high vacuum state inside the
compressor air end from being caused.
Purge control
unload operation
Intake negative pressure sensor (PRS1) detects the negative pressure inside
compressor air end. When a certain set time has passed at lower pressure
than the set negative pressure, solenoid valve (SV1) opens. Thus the
compressed air in separator receiver tank is sent to compressor control line to
close unloader valve and at the same time to relieve it from the tank to the
atmosphere, lowering the pressure and saving compressor power. When air
consumption increases and the pressure used for load drops below the set
pressure, pressure sensor (PRS2) detects it and it disengages purge control
mode (solenoid valve (SV1) closes) to start full load operation.
Stop
When stopping operation, it opens auto relief valve to relieve the compressed
air in separator receiver tank to atmosphere, detecting the pressure inside
compressor air-end.
PC08054E
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