Hitachi NEXT Series Instruction Manual page 82

8. STANDARD COMPONENTS AND SUBSYSTEMS [Capacity Control System]
8.4.6 PQ Wide Mode – Capacity Control Flow Settings
NOTE: PQ Wide Mode is set to OFF at the time of shipment from the factory. If PQ Wide Mode is required, it
needs to be set to ON on the instrument panel.
(1) PQ Wide Mode
Power Savings are Desired
Reliable energy savings are achieved
by lowering operating pressure.
104
100
90
80
90
Air consumption (%)
① By reducing the operating pressure from 125 psi
(0.86 MPa) to 106 psi (0.73 MPa), the maximum
consumption power is automatically limited to
approximately 92% of the consumption power at 125
psi (0.86 MPa).
② By reducing the operating pressure further down to
87 psi (0.60 MPa), the consumption power is reduced
to approximately 86%. The lowest set pressure is
65 psi (0.45 MPa).
If reducing the power is desired; the "PQ Wide Mode:
OFF" is recommended.
(2) PQ wide mode settings
The settings for PQ Wide Mode are to be changed while
the air compressor is stopped. Press the SELECT/WIDE
button o the instrument panel.
the control pressure setting.
80
PQ Wide Mode:
OFF
①
②
100 110
3.4.2 and 3.4.3 for
Higher Capacity is Desired
Increasing the capacity of the air compressor is
achieved by utilizing the maximum power of the
air compressor at lower operating pressure.
104
100
90
80
80 90
① B y reducing the operating pressure from 135 psi (0.93
MPa) to 87 psi (0.60 MPa), PQ-Wide Mode utilizes the
surplus power from the reduction in pressure to
increase the capacity up to approximately 104 [117]%
of the rated capacity.
② T he lowest set pressure is 87 psi (0.60 MPa). The
power consumption at 125 psi (0.86 MPa) is 100%.
The consumption power is 104%, utilizing the maximum
rated power of the air compressor at a lower operating
pressure for maximum capacity. If maximum capacity is
desired; the "PQ Wide Mode: ON" is recommended.
RUNNING CONTROL
ALARM
RESET
FUNC
REMOTE SELECT/WIDE
STR 1
PQ Wide Mode:
ON
②
①
100 117
Air consumption (%)
SELECT/WIDE
1
ON: The Light blinks.
OFF: The Light is off.
SELECT／WIDE
Set by button