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8. STANDARD COMPONENTS AND SUBSYSTEMS [Capacity Control System]
8.4.2 Typical Change of Pressure
⑴ Standard Offline-or-Online, 0%-or-100%-Capacity, 2-Step Control
Starting and
Pressure
Raising
Loading Unloading Loading
Air Receiver Pressure
Air End Outlet Pressure
Pressure
110
94
6
psi
Time
⑵ Optional AUTO Operation
（1） Stop Delay
(15 minutes)
（2） Stop Delay
(30% load)
（3） Start Delay
(10 seconds)
Starting
and
Pressure
Raising
Loading
Repeated
Loading/Unloading
Automatic
Motor Stop
Air Receiver Pressure
Air End
Outlet Pressure
Pressure
110
94
6
psi
Time
Automatic
Motor Restart
Indications on LCD
⑴ Stop Delay Time – 10 minutes are required to
keep the motor operating long enough to cool
down sufficiently.
If the third stop extends over 120 minutes,
however, the motor must keep operating for
more than 30 minutes after restarting.
⑵ Stop Delay Time – The DSP is continually cal-
culating a load ratio. If the load ratio is 30%
and the motor has stopped/restarted maximum
3 times for the past 150 minutes, then the
motor stops.
⑶ Stop Delay Time – 10 seconds are required to
complete blowing off the compressed air and
to be prepared to restart.
Starting
and
Pressure
Raising
Loading
Unloading
Power Save Operation
load/unload cycling interval
（standard 30 seconds）
Loading
Unloading
Air Receiver
Pressure
Air End
Outlet
Pressure
Pressure
110
94
6
psi
Time
＊ 97（minimum）
Loading
Unloading
Loading
Unloading
⑶ SAVE Mode Operation
NOTE:
This is an example of power save operation,
based on the target pressure of：0.67 MPa (97
psi) and the load/unload cycling interval of 30
seconds. The target pressure with an asterisk
may vary depending on the air receiver’s capacity
and the air consumption.
If the fixed speed machine is continuously loaded for a long period of time, condensate drain in blowoff air pipe may blowout from
blowoff silencer when unload start. To prevent blowout, air compressor unloads 0.5 second every 30 min when loading continue.
IMPORTANT
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