6.
LOADJNG
AND
INSTALLATION
/MELSEC-A
6.4
Wiring
Wiring instructions for the system.
6.4.1
Wiring instructions
Instructions for wiring the power cable or
I/O
cables.
(1)
Wiring of power source
-
(a)
When voltage fluctuations are larger than the specified
value, connect
a
constant-voltage transformer.
voltage
I
4
(b)
Use
a
power supply which generates minimal noise across
wire and across
PC
and ground. When excessive noise is
,-
I
generated, connect
an
insulating transformer.
d
Insulating
transformer
L----J
Insulating
transformer
When
a
power transformer or insulating transformer is
employed to reduce the voltage from
200
VAC
to
100
VAC,
use one with
a
capacity greater than that indicated in the
following table.
Power Supply
Transformer
Module
hpacity
A66PC
11OVA
X
n
-n" stands for the number
of
power supply modules.
When wiring, separate the
PC
power source from those for
I/O
equipment and power equipment as shown below.
Dower
PC
source source
1
OOV
AC
-a-
200V
AC
source
power
power
Main
PC
source
source
-4
r\
uo
equipment
n
Main circuit
-
Main
circuit
power source equipment
3
'9
1
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