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(2) Grounding
y For grounding, perform the following:
Use a dedicated grounding wire as far as possible. (Grounding
resistance of 100
or less.)
y When a dedicated grounding cannot be performed, use (2) Common
Grounding shown below.
Also, be sure to take noise countermeasures other than grounding.
(2) Common grounding Good (3) Joint grounding Not allowed
Grounding
GOT
Power
equipment
GOT
Power
equipment
GOT
Power
equipment
(Class 3 grounding)
Grounding
(Class 3 grounding)
(1) Independent grounding Best
y 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.
(a) An example of independent grounding
GOT
CN1A CN1B
CN2
CN3
FG
LG
Grounding for
control system
Grounding
terminal
block
Connection cable
Panel
grounding
Grounding for
power system
FG
FG
LG
Power equipment
(Servo, etc.)
Grounding terminal block
* For control system grounding, apply single-point grounding for one
system.
Especially for the devices communicating each other, be sure to
earth the grounding wire at one point.