MMD Equipment 185S-5C2 part 1 - Manual (Page 34)

4. Operation
4-16
AUTO IDLE
(Purge control)
operation
During unloaded operation, when the certain set time(it can be changed.)
has passed at lower pressure than the set negative pressure, detecting
the negative pressure inside the compressor air end with a pressure
sensor PRS1, solenoid valve SV1 opens and it closes unloader valve. At
the same time, it functions to relieve the compressed air from separator
receiver tank to the atmosphere and thus it lowers the pressure. Thus
the compressor power is saved. When air consumption increases, and the
pressure used for load drops below the set pressure, pressure sensor
PRS2 detects it and it disengages the purge control (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.
4.7.1 AUTO IDLE (Purge control)
This model is equipped with AUTO IDLE (Purge control ).
This operation mode is recommendable for such use.
Not so much air consumption is required and it is used continuously and also power
consumption under unloaded operation is required to be saved.
Use this mode, depending upon the need and demand. For the selection of this mode, switch on
“AUTO IDLE” on the operation panel.
Select this operation mode freely, according to required air consumption.
① During operation(After start up the
engine), push on the switch“1” “AUTO
IDLE”.
② Then the indicator lamp “AUTO IDLE” “2”
goes on.
③ In order to stop this operation mode, push
again “AUTO IDLE” switch “1”
and then the lamp “2” goes out to
disengage this purge mode.
As “AUTO IDLE” mode is reset when key
switch “STOP”is switched on, it is necessary
to select it whenever starting operation.
[
Explanation on AUTO IDLE]
This system is for reduction of fuel consumption, which is attained by lowering the pressure loaded
in separator receiver tank during unloaded operation
Separator receiver tank internal pressure in AUTO IDLE：approx.58psi(4bar)
A090638
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