55
7. WIRING [Connecting the Power Cable]
■ Other Operating Precautions
(1) A thermal relay is not provided on the main motor
circuit. Instead, the electronics-type thermal relay is
equipped in the controller to protect the main motor
overload.
(2) Phase failure is only enabled immediately after
connecting the power. If a phase failure occurs during
operation, it is not detected and eventually causes the
controller to overheat. Tightly fasten the cables/
wires during installing.
(3)
Do not install a power-factor enhancing capacitor on
the motor side. This may cause the excessive current
of the controller, and result in a failure of the controller.
(4) In the cases that a phase advance capacitor installed
between power and the air compressor opens and
closes, a surge voltage may be generated in the
controller input side, which may cause a controller
failure. In such cases, install an AC reactor shown in
the right table between power and the air compressor.
(5) If radios, TV sets, or any other electronics devices
are located around the air compressor, install the
HITACHI noise filters as specified in the right table
on the primary side of the air compressor.
Description
55 kW
Model
75kW
Model
Functions
Zero phase
reactor
460V
ZCL-A
Reduces the radio frequency
interference, etc.
Capacitive
Filter on
Input Line
460V
CFI-H
Reduces the conductive
noise in the power cable
wiring by the inverter.
EMI Filter
460V
NF-H150 NF-H200
Reduces radiated noise
from the power cable.
Recommended AC reactor
Model AC reactor
55 kW (460 V class) ALI-75H2
75 kW (460 V class) ALI-120H2
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