Lg Electronics 120S User Manual

 

9-7 

 

 

 

 

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

 

 

(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) 

               

 

 

 

 

 
 

 

 

 

 

   

 
 

 

 

 

                           

 

(4)

 

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

 

 

 

 

 
 

 

 

 

 

 
 

 

 
                                                                            ※  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. 

 

AC100-240V 

FG 

MASTER-K120S  

main unit 

Constant-voltage transformer 

T1 

T2 

PLC 

Main power 

AC220V 

PLC power 

I/O power 

Main circuit 

Main circuit device 

I/O device