1
Chapter 2. Installation and wiring
③
Cable between inverter output and motor should be less than 300m long. If cable gets long, surge
voltage appears across motor terminals depending on the cable parameters. Especially, in 400V class motor
case, insulation withstanding voltage may be decreased. Use an insulation-enforced motor when 400V class
motor is used.
④
Crimp terminal with insulation cap should be used for the input power supply and the motor.
⑤
After finishing wiring, be certain to remove all the wire or cable scraps inside the inverter.
⑥
Use the shield cable or twist-paired wire for control circuit terminal. Do not put them into the same wiring
duct for the power terminal.
⑦
When wiring is changed after operating the inverter, be sure to check LCD window on the keypad or
charge lamp is turned off. Capacitors inside inverter are charged with high voltage and it may result in lethal
injury.
⑧
Below 22kW inverter, B1 and B2 on the power terminal should not be connected to anything else other
than DB resistors.
2.3.3 Main Power Circuit Wire Sizes and Grounding Wire Size
①
Main Power Circuit Wire Sizes
If wiring for the main power terminal is not performed properly, it may cause severe damage to inverter or
lethal injury to inverter operator.
Be sure to use 600V, 75
℃
copper wire.
Wire Size
ScrewTorque
mm
2
AWG
Inverter
Capacity
Terminal
screw
size
(Kgf.cm)
(lb.in)
R, S, T
U, V, W
R, S, T
U, V, W
7.5 kW
M6
30.6~38.2 26.6~33.2
3.5
3.5
12
12
11 kW
M6
30.6~38.2 26.6~33.2
5.5
5.5
10
10
15 kW
M6
30.6~38.2 26.6~33.2
14
8
6
8
400V
22 kW
M6
30.6~38.2 26.6~33.2
22
14
4
6
1)
Apply the rated torque to terminal screws. Loose screws can cause of short circuit or malfunction.
Tightening the screws too much can damage the terminals and cause a short circuit or malfunction.
②
Grounding Wire Size and Caution to be taken
l
Be sure to ground the motor and the inverter to prevent electric shock injury. (200V class:
ground impedance 100
Ω
, 400V class: ground impedance 10
Ω
)
l
Connect the inverter ground to the ground terminal exclusively used for the inverter.
l
It is strongly recommended that as thick a grounding wire as possible be used and wire be short.
Ground wire size( mm
²
)
Motor Capacity
400V Class
7.5 kW
3.5
11 ~ 15 kW
8
22 kW
14