Mitsubishi Electric GOT2000 Series Hardware User Manual page 376

Grounding status of the control panel having the GOT
■Current status
Check if a single ground cable is led from the control panel having the control equipment such as a PLC to the control panel
having the GOT.
Connection
cable
Ground cable led from
the panel having the
control equipment
■Measure when a single ground cable is led
• Measure 1
A malfunction may be prevented by connecting the ground cable to the control panel having the GOT as shown in Figure A to
reduce the potential difference.
If wiring as shown in Figure A is unavailable, perform wiring as shown in Figure B.
Figure A
Connection
cable
LG
Ground wires
Use as short and
Grounding to
thick a wire as
the panel
possible.
• Measure 2
By attaching a ferrite core (KITAGAWA INDUSTRIES CO.,LTD. RFC-H13 or equivalent) to the ground cable connected to the
control panel having the GOT as shown in Figure C, the influence of noise is reduced.
If wiring as shown in Figure C is unavailable, perform wiring as shown in Figure D.
Figure C
Connection
cable
FG
LG
Ground wires
Grounding to
Use as short
the panel
and thick a wire
as possible.
12 TROUBLESHOOTING
374
12.1 GOT Restoration Sheets
GOT
FG
LG
GOT
FG
GOT
Ferrite core
Check result
□ Applicable
□ Not applicable
Figure B
Connection
cable
FG
LG
Ground wires
Grounding to
the panel
Figure D
Connection
cable
FG
Ground wires LG
Grounding to
the panel
GOT
GOT
Ferrite core
Effect
□ Effective
□ Ineffective
Effect
□ Effective
□ Ineffective