AirMan PDS185S-6C1, Руководство по обслуживанию

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3. Electric System
3-15
3.1.5 Solenoid valve
Part number:46811 24100
PC08032
Purge/starting unloader solenoid valve (NC)
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Function
When voltage is applied to CN1-6 terminal (power supply) of controller with the starter switch
“ON”, interior contact (RY3) controller CN1-9 and CN1-3 terminal turns “ON”, purge/starting
unloader solenoid valve gets electrically connected to be opened. Thus after engine starts, compressor
can perform starting unloader operation, starting engine smoothly at light load. When controller
CN2-17 terminal receives alternator generating signal, controller timer begins to function and in 10
seconds the internal contact (RY3) turns “OFF” and cut electrical connection to close the valve.
Compressor will be released from starting unloader operation mode and returns to normal operation.
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AUTO IDLE SWITCH “ON”
Pressing auto idle switch during operation, it will be switched to purge control operation mode.
When compressor is transferred to unloaded operation according to reduction of air consumption, the
intake negative pressure at secondary side increases. During purge control operation, the sensor
detects intake negative pressure and it outputs to controller. When a certain time has passed with
the value inputted to controller kept less than the set value (standard set value: 30% load factor), the
internal contact (RY3) will be connected “ON”. Accordingly, the solenoid valve for purge/starting
unloader is electrically connected to open the valve to reduce the receiver tank pressure and switched
to purge mode operation.
IN OUT
OUT
IN
･
Opened while electricity is supplied (NC)
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