Mitsubishi Electric QS001CPU User Manual page 95

10
LOADING AND INSTALLATION
(2) Grounding
POINT
1. Separate the ground of the surge absorber for lightning (E1) from that of the
programmable controller (E2).
2. Select a surge absorber for lightning whose power supply voltage does no
exceed the maximum allowable circuit voltage even at the time of maximum
power supply voltage elevation.
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.
Programmable
Another
controller
equipment
Ground
resistance of
100 or less
(1) Independent grounding Best
• For grounding a cable, use the cable of 2 mm
Position the ground-contact point as closely to the sequencer as possible, and
reduce the length of the grounding cable as much as possible.
Another
Programmable
equipment
controller
Ground
resistance of
100 or less
(2) Common grounding Good
Figure 10.23 Grounding procedures
2
or more.
10.3.1 Wiring precautions
Programmable Another
controller equipment
(3) Joint grounding Not allowed
10
10.3 Wiring
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