Alpha ALPHA6000 Series - Control Circuit Connection

Chapter 2 Installation and Wiring
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16
Countermeasures to RFI: The input cables, output cables and the
ac drive 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 ac drive 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 ac drive and the motor.
The longer the distance between the ac drive 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 ac drives and equipments nearby, so
reduce leakage current as little as possible.
The relationship of the distance between the ac drive and the motor and carrier frequency
is shown as Table 2-7.
Table 2-7 Distance between the ac drive and the motor and carrier frequency.
Distance between ac drive
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