AirMan PDS400S-6C3, Service Manual

Page: 17 / 102

1. Specification
1-11
Step Response
Suction port closing
unload operation
When air consumption decreases and it exceeds the rated pressure, the pressure
regulator operates to close the unloader valve. At the same time, the pressure
sensor provided at the secondary side of pressure regulator detects and sends to
engine controller the signal of engine speed lowering. At the unload condition,
the inside of air end becomes high vacuum and it causes vacuum noise. In order
to prevent this noise, it opens vacuum relief valve to prevent the compressor air
end from becoming vacuum.
●
Engine (revolution) speed at unload conditions is operated at 1,600min
-1
under
less than discharge air temperature less than 60
℃
, and when it becomes
higher than 60
℃
, the speed will be 1,300min
-1
.
Stop
Detecting the pressure inside compressor air end, the auto-relief valve operates,
and the compressed air in separator receiver tank is automatically relieved to
the atmosphere from unloader primary side.
Discount-Equipment.com