Chapter 9 Installation and Wiring

9.2Wiring

The followings explains the wiring instructions for use of the system.

9.2.1 Power Supply Wiring

(1)When voltage fluctuations are larger than the specified value, connect a constant-voltage transformer.

(2)Use a power supply which generates minimal noise across wire and across PLC and ground. (When excessive noise is generated, connect an insulating transformer)

MASTER-K120S main unit

AC100-240V

FG

Constant-voltage transformer

(4) When wiring, separate the PLC power supply from those for I/O and power device as shown below.

Main power

PLC power

 

AC220V

T1

PLC

 

I/O power

 

 

T2

 

 

Main circuit

I/O device

 

 

 

 

Main circuit device

T1,T2 : constant voltage transformer

 

(5)To minimize voltage drop, use the thickest (max. 2 ) wires possible

(6)Do not bundle the 100 VAC and 24VDC cables with main-circuit (high voltage, large current) wires or the I/O signal wires. If possible, provide more than 80 distance between the cables and wires.

9-7

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LG Electronics 120S user manual Power Supply Wiring, Power Main circuit Device, ※ T1,T2 constant voltage transformer