Hitachi DSP-110A6N User Manual

8. STANDARD COMPONENTS AND SUBSYSTEMS [Capacity Control System]
70
Air
intake
Air intake filter
1st-stage
airend
Intercooler
Check valve
Aftercooler
Blowoff
silencer
Pressure
sensor
Air
discharge
1st-stage
Blowoff solenoid valve (1)
2nd-stage
Blowoff solenoid valve (1)
2nd-stage
Blowoff solenoid valve (2)
1st-stage
Blowoff solenoid valve (2)
2nd-stage
airend
PS2
8.4.4 Capacity Control System V-type
8.4.5 Relationship between Air Consumption Rate and Capacity Control System
To change the pressure setting and the capacity control
type,
2.4.2 and 3.4.3.
※
Figure in
[ ]
are for 125 psi(0.86 MPa) models.
Air
consumption
(%)
Operating frequency (Hz)
Capacity control system
Pressure settings psi [MPa]
SW3
settings
90kW 110kW Setting items Factory
Lower
example
100 to 45
60 to 35
〔52 to 35〕
60 to 37
〔51 to 37〕
①
CPCS Motor speed control
Control
pressure
125 [0.86] 100 [0.69]
AUTO ON
（VSDA）
or
AUTO OFF
（VSDB）
45 to 5 25
②
Two-step purge control
Cut-out
pressure
128 [0.88] 104 [0.72]
AUTO ON
（VSDA）
or
AUTO OFF
（VSDB）
Cut-in
pressure
123 [0.85] 85 [0.59]
5to0
Motor stopped
③
Motor stop/restart control
Cut-in
pressure
123 [0.85] 85 [0.59]
AUTO ON
（VSDA）
The air compressor supports the three (3) capacity control systems as shown above.
Depending on the varying air consumption, an appropriate system is automatically selected. For more information, see
the following page. Operation frequency is shown by Digital monitor. LCD monitor displays up to first figure after
decimal place.
IMPORTANT
Purging Air Flow and Action of Blowoff Solenoid Valve
Operation phase
Blowoff solenoid
valve (1)
Blowoff solenoid
valve (2)
Starting Fully opened Fully closed
Loading Fully closed Fully closed
Purging Fully opened Fully closed
Stop Fully opened Fully opened
Power Interruption Fully closed Fully opened

Hitachi DSP-110A6N Specifications

General

Brand	Hitachi
Model	DSP-110A6N
Category	Air Compressor
Language	English