Hitachi LH1 Series

2-7
Chapter 2
Installation and Wiring
2.5 Wiring of the main circuit
Wire the main circuit of the inverter.
The following illustration shows the power supply and
wiring connections to a motor only.
Open a terminal block cover to wire the terminal block in
the main circuit.
Explanation of main circuit terminal block
 The screw size may vary depending on terminal. Refer to Page
2-8/2-9 for the size of the terminal screw for the power line cable
while for other terminals, refer to the drawings of the wiring on
Page 2-11 or later.
 The tables on Page 2-8/2-9 list the specifications of cables, crimp
terminals, and terminal screw tightening torques for reference.
Symbol
Terminal name
Description
R,S,T
(L1,L2,L3)
Main power input
Connect to the AC power supply. Leave these terminals unconnected
when using a regenerative converter（HS900A series）.
U,V,W
(T1,T2,T3)
Inverter output
Connect a Three-phase motor.
PD,P
(+1,+)
DC choke
connection terminal
Remove the PD-P jumper from terminals, and connect the optional DC
choke for power factor improvement.
P,RB
(+,RB)
External chopper
braking resistor
connection terminal
Connect the optional external braking resistor. See “Chapter 7
Specifications” for built-in braking circuit inverter models.
P,N
(+,-)
Regenerative braking
unit connection
terminal
Connect the optional regenerative braking unit.
Inverter ground
terminal
This serves as a ground terminal for the inverter chassis to ground.
Connect 400V class models to Type-C grounding.
ELB
Earth-leakage
circuit breaker
Magnetic
contactor
MC
Three-phase
AC power
supply
R/L1
S/L2
T/L3
R0
T0
T0
U/T1
V/T2
W/T3
Control circuit
power supply
Type-C grounding
(400 V class model)
J51 connector
Three-phase
AC motor
M
Main circuit
terminal section
3φ
P/+
PD/+1
RB
N/-
Jumper
400V class:
380 to 460Vac