Omron 3G3RX - Ground Terminal; Installing Screws in the Main Circuit Terminal Block

2-13
2-2 Wiring
2
Design
Ground Terminal (G )
• To prevent electric shock, be sure to ground the Inverter and the motor.
• According to the Electric Apparatus Engineering Regulations, the 200-V class Inverter should be
connected to the grounding electrodes under type-D grounding conditions (conventional type 3
grounding: ground resistance 100  or less), the 400-V class Inverter should be connected to the
grounding electrodes under type-C grounding conditions (conventional special type 3 grounding:
ground resistance 10  or less).
• For the ground cable, use the applicable cable or a cable with a larger diameter. Make the cable
length as short as possible.
• When several Inverters are connected, the ground cable must not be connected across several
Inverters, and must not be looped.
Otherwise, the Inverters may malfunction.
Installing Screws in the Main Circuit Terminal Block
• For the main circuit terminal blocks of 3G3RX-A2055/-A2075/-A4055/-A4075, be sure to install
the terminal block screw washers with their grooved sides aligned vertically, as shown below.
Not doing so may result in a contact failure or fire.
(Intended terminals: R/L1, S/L2, T/L3, PD/+1, P/+, N/-, U/T1, V/T2, W/T3, RB)
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Yo ur ground bolt
Terminal block screw washer