User manual

Chapter 2 Installation and Wiring

Countermeasures to RFI: The input cables, output cables and the inverter itself would

produce RFI. Placing noise filters both at input and output sides, and shielded with metal

shell would reduce RFI. The cables between the inverter and the motor should be as short

as possible. Measure to reduce RFI is shown as Figure 2-10.

Power

supply

Noise

Filter

Inverter

Noise

Filter

Motor

Metal tube

Metal shell box

Fig 2-10 Method to Restrain RFI

Distance between the inverter and the motor.

The longer the distance between the inverter and the motor, the higher the carrier

frequency would be, and the greater the high harmonic leakage current of the cables

would be. Leakage current has a negative impact to inverters and equipments nearby, so

reduce leakage current as little as possible.

The relationship of the distance between the inverter and the motor and carrier frequency

is shown as Table 2-7.

Table 2-7 Distance between the inverter and the motor and carrier frequency.

Distance between inverter

and motor

Below 50m Below 100m Above 100m

Carrier frequency Below 8 kHz Below 4 kHz Below 2 kHz

2.5 Control Circuit Connection

2.5.1 Function of Control Circuit Terminals

Fig 2-11 S2R4GB～3004GB Arrangement of Control Circuit Terminals