Mitsubishi Electric Melsec-Q172DCPU User Manual page 176

4 INSTALLATION AND WIRING
(b) Do not bundle the 100VAC and 24VDC wires with, or run them close to, the
main circuit (high voltage, large current) and I/O signal lines (including
common line).
Reserve a distance of at least 100mm (3.94inch) from adjacent wires.
(c) Momentary power failure may be detected or the Multiple CPU system may
be reset due to surge caused by lightning.
As measures against surge caused by lightning, connect a surge absorber
for lightning as shown below.
Using the surge absorber for lightning can reduce the influence of lightning.
AC
POINTS
(1) Separate the ground of the surge absorber for lightning (E1) from that of the
Multiple CPU system (E2).
(2) Select a surge absorber for lightning whose power supply voltage does not
exceed the maximum allowable circuit voltage even at the time of maximum
power supply voltage elevation.
(2) Wiring of I/O equipment
(a) Insulation-sleeved crimping terminals cannot be used with the terminal block.
It is recommended to cover the wire connections of the crimping terminals
with mark or insulation tubes.
(b) The wires used for connection to the terminal block should be 0.3 to
2
0.75mm in core and 2.8mm (0.11inch) or less in outside diameter.
(c) Run the input and output lines away from each other.
(d) When the wiring cannot be run away from the main circuit and power lines,
use a batch-shielded cable and ground it on the Motion controller side.
In some cases, ground it on the opposite side.
Multiple CPU system
Input
Output
(e) Where wiring runs through piping, ground the piping without fail.
(f) Run the 24VDC input line away from the 100VAC and 200VAC lines.
Multiple CPU
system
U
U U
E2
E1
Surge absorber for lightning
Shield cable
Shield
DC
4 - 25
RA