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Wiring; Power Supply Equipment; Miv And Wivm Wiring - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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7. WIRING

1. Always use a licensed electrician. Do not allow an unlicensed person to wire the air compressor. An
unlicensed person may wire the air compressor wrongly, and a wrong wiring may cause an electric shock.
2. Do not remove any protective relays on the air compressor. Also, do not make a modification of the
control circuit that may result in impairing the protective relay's function. Remember that the loss of the
protective relay's function may cause serious damage to the air compressor such as a burning of the air
end. In the event that you need to modify the control circuit, consult your distributor.
3. Before opening the control panel to service or wire the air compressor, disconnect the power; otherwise
you may receive an electric shock. In addition, attach a notice on the power supply stating "Under the
maintenance work. Keep the switch off." to prevent someone from carelessly turning the switch on.

7.1 Power Supply Equipment

Use a power supply transformer with adequate kVA
capacity and a power cable with adequate thickness and
length. If properly sized transformers and cables are not
used, excessive voltage drop could occur when the
START button is pressed, resulting in 1.) Motors failing
to fully accelerate and/or, 2.) An inefficiently energized
control circuit; thus shutting down the air compressor.
To keep a starting voltage drop within an allowable range
(5% of the rated voltage), use the power supply
Model
Power Supply Voltage
Power Transformer Capacity
Power Cable Thickness AWG (mm
Capacity values are reference data; some power supplies may require a larger-capacity transformer.

7.2 MIV and WIVM wiring

WIRING FOR MIV
WIRING No. 'DA'
1
WIRING No. '44'
2
3
WIRING No. '43'
4
CABLE FROM TB3 IN THE CONTROL PANEL
5
TERMINAL BOX OF MIV
WIRING FOR WIVM
WIRING No. 'DA'
BLACK
WIRING No. '46'
WHITE
WIRING No. '45'
RED
GREEN
CABLE FROM TB3 IN THE CONTROL PANEL
YELLOW
TERMINAL BOX OF WIVM
WARNING
DSP-90A6N
DSP-90W6N
(1)
(KVA)
200 or more
4/0 to 300
2
)
(125 to 150)
transformer and power cable shown below table. Lower
thickness values are based on the power cable length of
less than 393 inches (10 m). In the event that the power
cable is longer than 393 inches (10 m), employ a thicker
power cable. Provide intermediate terminals to keep the
power cable thickness lower than the maximum values at
the air compressor terminal block. The maximum
voltage imbalance between the phases shall be within 1%.
DSP-110A6N
DSP-90VA6N
DSP-110W6N
DSP-90VW6N
460V
250 or more
200 or more
250 to 300
4/0 to 300
(125 to 150)
(125 (2) to 150)
① Electrical wiring of Motorized Isolation Valve (MIV),
and Motarized Water Isolation Valve (WIVM) shall
be install on side. Refer to the drawing.
(WIVM is only for water-cooled.)
DSP-110VA6N
DSP-110VW6N
250 or more
250 to 300
(125 to 150)
51

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