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I
6. LOADING AND INSTALLATION
MELSEC-A
(e) Note on using 24 VDC output of the A66PC power supply modules.
To protect the power supply modules, do not supply one I/O module
with 24 VDC from several power supply modules connected in
parallel.
If 24 VDC output capacity is insufficient for one power supply
module, supply 24 VDC from the external 24 VDC power supply as
shown below:
24VDC
1/0
module
Power
supply
module
1/0
module
(I) Twist the 100 VAC, 200 VAC, and 24 VDC cables as closely as
possible. Connect modules with the shortest possible wire lengths.
(g) Tom minimize voltage drop, use the thickest (max. 2 mm 2 (14 AWG"
wires possible for the 100 VAC, 200 VAC, and 24 VDC cables.
(h) Do not bundle the 100 VAC and 24 VDC cables with main-circuit
wires or the I/O signal wires (high-voltage, large-current). Also, do
not wire the above indicated cables close to the aforementioned
wires. If possible, provide more than 100 mm (3.94 in) distance
between the cable and wires.
(i) As a measure against verylarge surges (e.g. due to lightening),
connect a surge absorber as shown below:
-<>I'c--+-t--t-H
pc
1/0
AC
equipment
i
i
co
E2
,
,
~_
7
_~
_
Surge absorberfor lightning
6-5

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