4INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT

4.3.2 Wiring of the differential driver common terminal

MELSEC-Q

When the differential driver output system (QD75D1, QD75D2, QD75D4) is used, a potential difference between commons may occur between the differential driver common terminal and the differential receiver common terminal of the drive unit. To remove the potential difference between commons, connect the differential driver common terminal of the QD75D1/QD75D2/QD75D4 and the differential receiver common terminal of the drive unit.

When the common terminal of the drive unit is photocoupler-connected, the wiring to the differential driver common terminal of the QD75D1/QD75D2/QD75D4 is not needed since a potential difference between commons does not exist.

(For the drive unit specifications, refer to the manual of the used drive unit.)

The following shows an example of wiring to the differential driver common terminal of the QD75D1/QD75D2/QD75D4.

Up to two cables can be connected to one differential driver common terminal. (For details, refer to Section 3.1 "Performance specifications".

 

Module bottom

Module front

 

 

 

 

Differential driver common terminal

 

 

To differential receiver common terminal of drive unit

 

Module front

Module side

 

 

Insert until hook

 

 

catches.

Module bottom

 

 

 

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Mitsubishi Electronics QD75D Wiring of the differential driver common terminal, Insert until hook Catches Module bottom