AirMan PDS185S-6E1, Service Manual

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1. Specification
1-10
1.6.1 Auto idle control (purge control)
This model is equipped with auto idle control operation mode. 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.
<Procedure>
①
During operation, long push (2 seconds) on AUTO IDLE switch (purge control) “1”.
②
Then the AUTO IDLE lamp “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 control.
A130957
Function of auto idle control (purge control)
Function Conditions of AUTO IDLE lamp
①
First engine speed drops to the minimum speed by pressure
regulator, owing to reduction of air consumption. Later the
air consumption is reduced further, the unloader valve
gradually closes and intake negative pressure increases. In
this stage, the pressure sensor detects the intake negative
pressure. Then when the intake negative pressure becomes
higher than the set pressure, the AUTO IDLE lamp flickers
at short intervals.
Lamp flickers at short intervals.
②
When this condition continues for a certain time, the
solenoid valve functions to start purge mode operation.
Consequently, the pressure inside separator receiver tank
drops and reduces the power of compressor air-end. In this
stage, the AUTO IDLE lamp flickers at longer intervals.
Lamp flickers at longer intervals.
③
Next, when the pressure for load down to the purge
releasing pressure owing to the increase of air consumption,
the solenoid valve operation gets “OFF” and it is
transferred to normal operation. In this stage, the AUTO
IDLE lamp goes on.
Lamp goes on.
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