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6.1 GOT Main Unit
6.1.3 Wiring method
3) 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.
Also, be sure to take noise countermeasures other than grounding.
• 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
* 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.
(b) An example of common grounding
* Apply single-point grounding for one system.
(2) Common grounding Good (3) Joint grounding Not allowed
Grounding
(Class 3 grounding)
GOT
Power
equipment
GOT
Power
equipment
GOT
Power
equipment
Grounding
(Class 3 grounding)
(1) Independent grounding Best
GOT
CN1ACN1B
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
GOT
CN1A CN1B
CN2 CN3
FG
LG
Connection cable
Panel grounding
Grounding terminal block
Use a grounding wire as thick and short as possible.
FG
FG
LG
Power equipment
(Servo, etc.)