Hitachi NEXT Series Instruction Manual page 57

■ 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.
7. WIRING [Connecting the Power Cable]
55 kW
Description
Model
Zero phase
460V
ZCL-A
reactor
Capacitive
Filter on 460V CFI-H
Input Line
EMI Filter 460V NF-H150 NF-H200
Recommended AC reactor
Model
55 kW (460 V class)
75 kW (460 V class)
75kW
Functions
Model
Reduces the radio frequency
interference, etc.
Reduces the conductive
noise in the power cable
wiring by the inverter.
Reduces radiated noise
from the power cable.
AC reactor
ALI-75H2
ALI-120H2
55