Chapter 9 Installation and Wiring
9-7
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.
※ 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