Wiring; Power Supply Wiring - LG MASTER-K 120S Series User Manual

Chapter 9 Installation and Wiring

9.2 Wiring

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)
(4) When wiring, separate the PLC power supply from those for I/O and power device as shown below.
AC220V
(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.
Constant-voltage transformer
Main power
PLC power
I/O power
Main circuit
※ T1,T2 : constant voltage transformer
MASTER-K120S
main unit
T1
T2
9-7
.
AC100-240V
FG
PLC
I/O device
Main circuit device