MMD Equipment 185S-6C1 - Manual (Page 35)

4. Operation
4-17
Purge control unload
operation
When the certain set time ( it can be changed.) has passed at lower pres-
sure than the set negative pressure, detecting the negative pressure in-
side 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 atmos-
phere 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 dis-
engages the purge control (SV1 closes) to start full load operation.
Stop
When stopping operation, it opens Auto relief valve to relieve the com-
pressed air in separator receiver tank to atmosphere, detecting the pres-
sure inside compressor air-end.
4.6.1 AUTO IDLE
This model is equipped with AUTO IDLE (PURGE CONTROL MODE OPERATION).
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, 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 disen-
gage this purge mode.
A070184-1
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