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Installation status
■Actual status
The FG cables of control equipment (such as a PLC) and power equipment (such as a servo amplifier) are connected each
other as shown in a.
Servo
PLC
FG
CN1A
CN1B
CN2
CN3
LG
FG
a
Panel grounding
■Corrective action for when it is true
Carry out the independent grounding at two points as shown in Figure A.
Independent grounding will help minimize noise interference.
If the independent grounding is impossible, carry out the shared grounding as shown in Figure B.
Figure A
PLC
Servo
FG
CN1A
CN1B
CN2
CN3
LG
FG
Panel
Terminal
grounding
block
Grounding for
power system
34 TROUBLESHOOTING
406
34.1 GOT Restoration Sheets
Connection cable
GOT
FG
Panel
grounding
Connection cable
GOT
FG
Terminal
block
Grounding for
control system
Grounding for
power system
Check result
□ True
□ False
Figure B
PLC
Servo
FG
CN1A
CN1B
CN2
CN3
LG
FG
Panel grounding
Connection cable
GOT
FG
Panel grounding
Result
□ Effective
□ Ineffective
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Troubleshooting
