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7. WIRING

7.1 Power Source Transformer and Power Cable

Prepare a power supply transformer with adequate
capacity. Also, use a power cable with adequate thickness
and length. Otherwise, an excessive voltage drop may
occur when you have pressed the

START

button; accord-

ingly the

DSP

motor may fail to fully accelerate.

Also a control circuit may occur be energized insuffi-
ciently ; accordingly the

DSP

may be shut down.

7.3 Connecting a Power Cable

①

Wiring inside the

DSP

is completed prioer to ship-

ment by Hitachi.

Refer to

“Wiring Connection Diagram”

(

47-48).

②

Ground resistance requirements are required when

connected the power cable and grounding cable. The
ground resistance requirements are shown in the
table below:

Power Supply Voltage Ground Resistance Type Ground Resistance Value

460V

Type C

or less

③

Connect the power cable so that ease of disassem-

bling and reassembling the enclosure panels is taken
into consideration.

④

The compressor requires its own branch circuit pro-

tection adjacent to the compressor.

The type (Fuse disconnect, Circuit breaker, or Earth

leakage (ground) circuit breaker) and its sizing must
be selected in accordance with national or local elec-
tric code requirements . (Recommendation type:

4. Wiring Connection Diagram

) Do not use simple

disconnect such as a knife switch in wiring.

The type and sizing not supplied by Hitachi is the

responsibility of the customer.

NOTE: If the earth leakage circuit breaker is used, the sen-

sitivity-current is set to 200 mA.

Model

DSP-132W6N

DSP-145W6N

DSP-160(V)W6N

DSP-200W6N

DSP-240(V)W6N

Power Supply Voltage

400V Class

Power Transformer

Capacity (1) (KVA)

350 or more

500 or more

Power Cable Thickness

mm2 (AVG)

150(2) to 250

(250 to 350)

200(2) to 250

(300 to 350)

250(2) or more

(4/0×2 or more)

325(2) or more

(250×2 or more)

NOTES:
(1) Capacity values are reference data; some power supplies may require a larger-capacity transformer.
(2) Lower thickness values are based on the power cable length of less than 20 m. In the event that the power cable is longer than 20m,

employ a thicker one. Provide intermediate terminals to keep the thickness lower than the maximum values at the air compressor terminal
block.

Always control the maximum drop of starting voltage
within 5% of the rated voltage. To do so, use the power
supply transformer and power cable as listed in the table
below.
The maximum voltage imbalance between the press shall
be within 1%.

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 starter/control box cover to service or wire the air compressor, disconnect the power;

otherwise you may receivean 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.

WARNING

7.2 MIV and WIVM wiring

①

Electrical wiring of Motorized Isolation Valve (MIV),

which is attached at left side panel, and Motarized
Water Isolation Valve (WIVM) shall be done on side.
Refer to below drawing.