Typical Change Of Pressure - Hitachi NEXT Series Instruction Manual

8. STANDARD COMPONENTS AND SUBSYSTEMS [Capacity Control System]

8.4.3 Typical Change of Pressure

⑴ Offline-or-Online, 0%-or-100%-Capacity, 2-Step Control (Only for Fixed Speed Type)
Starting and
Pressure
Raising
100
85
Air Receiver Pressure
psi
15
⑵ AUTO Operation
（2） Stop Delay
（1） Stop Delay
(10 minutes)
Starting
and
Loading
Pressure
Raising
Air Receiver Pressure
100
85
psi
15
⑶ ECOMODE Operation
Starting
and
Loading Unloading
Pressure
Raising
100
＊ 90 （ minimum）
85
Air Receiver
Pressure
psi
15
Loading Unloading
Time
（3） Start Delay
(30% load)
(15 seconds)
Repeated Automatic
Loading/Unloading
Motor Stop
Indications on LCD
Time
Power Save Operation
load/unload cycling interval
（standard 30 seconds）
Loading Unloading
Loading Unl o adi n g
Time
Loading
Air End Outlet Pressure
Automatic
Motor Restart
Air discharge pressure
after aftercooler
Loading Unl o adi n g
Air discharge pressure
after aftercooler
⑴ Stop Delay Time-Requires 15 seconds
of motor operation to sufficiently cool
down the motor.
If the third stop is done after 70
minutes or more has passed after
the first stop, the motor continues
to operate for 20 minutes after
restart of the air compressor, and
then return to the initial cycle.
⑵ Stop Delay Time – The air compressor
is continually calculating a load ratio.
If the load ratio is 30% and the motor
has stopped/restarted maximum 3
times for the past 90 minutes, then
the motor stops.
⑶ Stop Delay Time – Requires 10 seconds
to completely exhaust inter nal
compressed air and prepare to restart.
(Note)
ECOMODE setting
Target pressure: 90 psi (0.62 MPa)
Toad/unload cycling interval: 30 sec
The pressure with asterisk may vary
depending on the air receiver's capacity
and the amount of air consumption.
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