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10
LOADING AND INSTALLATION
10.3 Wiring
10.3.1 Wiring precautions
10 - 21
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
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) Grounding
For grounding, perform the following:
• Use a dedicated grounding wire as far as possible. (Grounding resistance of
100 or less.)
• When a dedicated grounding cannot be performed, use (2) Common Grounding
shown below.
• For grounding a cable, use the cable of 2 mm
2
or more.
Position the ground-contact point as closely to the sequencer as possible, and
reduce the length of the grounding cable as much as possible.
Figure 10.23 Grounding procedures
(3) Joint grounding Not allowed
Programmable
controller
Another
equipment
Programmable
controller
Another
equipment
Programmable
controller
Another
equipment
(1) Independent grounding Best (2) Common grounding Good
Ground
resistance of
100 or less
Ground
resistance of
100 or less