Mitsubishi Electric MELCEC Q Series User Manual page 158

9. LOADING AND INSTALLATION
If the 24VDC output power from a single power supply module is insufficient,
supply it from the external 24VDC power supply.
(g) Twist the 100VAC, 200VAC or 24VDC wires as tightly as possible, and use the
minimum length to make connection between modules.
Also, use a thick wire (max. 2 mm
(h) Do not install 100VAC and 24VDC wires together with main circuit wires (high
voltage and large current) or I/O signal lines (including common line). Provide a
distance of 100mm or more between them if possible.
(i) As measures against lightning surges, connect a lightning surge absorber as
shown below.
AC
E1
E1
POINT
(1) Ground the lightning surge absorber (E1) and the programmable controller
(E2) separately from each other.
(2) Select a lightning surge absorber whose voltage does not exceed the
maximum allowable circuit voltage even when line voltage reaches the
maximum.
2
) to minimize voltage drop.
Programmable
controller
I/O devices
E2
E1
surge absorber for
lightning
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