Mitsubishi 13J851, User Manual

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(b) Install wiring to a terminal block using the cable of core diameter 0.3 to
0.75mm
2
, and outside diameter 2.8mm or less.
(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 PLC side.
However, ground it on the opposite side in some cases.
PLC
Input
Output
DC
Shielded cable
Shield jacket
RA
(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.
(g) The cabling of 200m (656.2ft.) or longer distance may produce
leakage current depending on the capacity between lines and result in
an accident.
(h) As a countermeasure against the power surge due to lightning,
separate the AC wiring and DC wiring and connect a surge absorber
for lightning as shown in (i) of item (1).
Failure to do so increases the risk of I/O device failure due to lightning.
(3) Grounding
CAUTION
Be sure to ground the FG terminals and LG terminals to
the protective ground conductor. Not doing so could result
in electric shock or erroneous operation.
(a) Carry out the independent grounding if possible. (Grounding
resistance 100 or less.)
(b) If the independent grounding is impossible, carry out the shared
grounding (2) as shown below.
PLC
Other
device
Class 3
grounding
(1) Independent grounding.....Best (2) Shared grounding.....Good (3) Common grounding.....Not allowed
PLC
Other
device
PLC
Other
device
Class 3
grounding
(c) Use the cable of 2mm
2
or more for grounding.
Set the grounding point closer to the PLC to make the grounding cable
short as possible.
(d) If a malfunction occurs due to earthling, separate either LG or FG of
the base module, the device combination, or all the connection from
the earthling.