Mitsubishi Electric MELSEC-Q Series User Manual page 87

(i) As a countermeasure to power surge due to lightening,
connect a surge absorber for lightening as shown below.
AC
E1
POINT
(1) Separate the ground of the surge absorber for lightening (E1) from that of the
programmable controller (E2).
(2) Select a surge absorber for lightening whose power supply voltage does no
exceed the maximum allowable circuit voltage even at the time of maximum
power supply voltage elevation.
(2) Wiring to I/O device
(a) The solderless terminal with insulation sleeve is inapplicable to
a terminal block.
It is advisable to cover the wire connection part of a terminal
with a mark tube or insulation tube.
(b) Install wiring to a terminal block using the cable of core
diameter 0.3 to 0.75mm
(c) Run the I/O line and output line away from each other.
(d) When the main circuit line and power line cannot be
separated, use a shielding cable and ground it on the
programmable controller side.
However, ground it on the opposite side in some cases.
Programmable controller
Input
Output
(e) When cables are run through pipes, securely ground the
pipes.
(f) Run the 24VDC input line away from the 100VAC and 200
VAC lines.
Programmable
controller
I/O
devices
E2
Surge absorber for lightening
2
, and outside diameter 2.8mm or less.
Shielded cable
Shield jacket
DC
53
RA