4INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT

[Wiring examples using duct (incorrect example and corrected example)]

MELSEC-Q

Control panel

Control panel

Relay

 

Relay

 

Drive

Drive

Relay

 

unit

unit

 

 

 

 

 

PLC

QD

 

 

75

 

 

 

Noise source

 

 

(power system,

 

 

etc.)

 

 

 

 

 

Changed

 

Relay

 

Relay

 

 

 

Relay

 

 

 

PLC

QD

 

 

75

 

 

 

Noise source

(power system,

Drive

Drive

etc.)

unit

unit

 

Wiring duct

The drive units are placed near the noise source.

The connection cable between the QD75 and drive units is too long.

Wiring duct

The QD75 and drive units are placed closely. The connection cable between the QD75 and drive units is separately laid from the power line (in this example, the cable is outside of the duct) and is as short as possible.

(11)The influence of noise may be reduced by installing ferrite cores to the cable connected to the QD75 as a noise reduction technique.

For the noise reduction techniques related to connection with the servo amplifier, also refer to the instruction manual of the servo amplifier.

(12)If compliance with the EMC directive is not required, the influence of external noise may be reduced by making the configuration compliant with the EMC directive.

For the configuration compliant with the EMC directive, refer to Chapter 3 "EMC AND LOW-VOLTAGE DIRECTIVES" in the User's Manual (Hardware) of the used CPU module.

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Mitsubishi Electronics QD75P, QD75D user manual Control panel