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2 Design
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
2-3 Wiring
2
2-3-4 Wiring for Main Circuit Terminals
Installing input surge absorber
When using an inductive load (such as a magnetic contactor, magnetic relay, magnetic valve,
solenoid, or electromagnetic brake), use a surge absorber or diode together.
Installing input noise filter
The inverter performs high-speed output switching, which may cause the noise flow from the inverter
to power supply lines that negatively affects on peripheral equipment. Therefore, it is recommended
to use an input noise filter to reduce noise flowing out to power supply lines. This also helps to
reduce noise that enters the inverter from power supply lines.
To prevent electric shock, be sure to ground the inverter and the motor.
The 200-V class should be connected to the ground terminal under type-D grounding conditions
(conventional Class 3 grounding conditions: 100 Ω or less ground resistance), The 400-V class should
be connected to the ground terminal under type-C grounding conditions (conventional special Class 3
grounding conditions: 10 Ω or less ground resistance).
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 or looped. Otherwise, the inverters and peripheral control equipment may malfunction.
Wiring for Ground Terminal (G )
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