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Chapter 2
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.
Earth-leakage
circuit breaker
ELB
Three-phase
AC power
supply
400V class:
J51 connector
380 to 460Vac
Control circuit
power supply
Explanation of main circuit terminal block
Symbol
Terminal name
R,S,T
Main power input
(L1,L2,L3)
U,V,W
Inverter output
(T1,T2,T3)
PD,P
DC choke
(+1,+)
connection terminal
External chopper
P,RB
braking resistor
(+,RB)
connection terminal
Regenerative braking
P,N
unit connection
(+,-)
terminal
Inverter ground
terminal
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.
Magnetic
contactor
MC
R/L1
S/L2
T/L3
R0
T0
T0
Description
Connect to the AC power supply. Leave these terminals unconnected
when using a regenerative converter（HS900A series）.
Connect a Three-phase motor.
Remove the PD-P jumper from terminals, and connect the optional DC
choke for power factor improvement.
Connect the optional external braking resistor. See "Chapter 7
Specifications" for built-in braking circuit inverter models.
Connect the optional regenerative braking unit.
This serves as a ground terminal for the inverter chassis to ground.
Connect 400V class models to Type-C grounding.
RB
N/-
Main circuit
terminal section
2-7
Installation and Wiring
Jumper
PD/+1
P/+
Three-phase
AC motor
U/T1
M
V/T2
3φ
W/T3
Type-C grounding
(400 V class model)
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