Chapter 3 - Installation and Wiring
GP-37W3 Series User Manual
3-6
3.2.2
Grounding
(a) Exclusive Grounding (BEST)
*1
Connect the FG terminal found at the
back of the unit to an exclusive ground.
[diagram (a)].
(b) Common Grounding (OK)
*1
• Check that the grounding resis-
tance is less than 100
Ω
Ω
Ω
Ω
Ω
.
• The FG and SG terminals are
connected internally in the GP.
• When connecting the SG line to
another device, be sure that the
design of the system/connec-
tion does not produce a short-
ing loop.
• The grounding wire should have
a cross sectional area greater
than 2mm
2
. Set the connection
point as close to the GP unit, and
make the wire as short, as pos-
sible. When using a long
grounding wire, replace the thin
wire with a thicker wire, placed
in a duct.
(c) Common Grounding (Not OK)
Input and output signal lines must be separated from the power control cables
for operating circuits.
If this is not possible, use a shielded cable and connect the shield to the GP’s frame.
3.2.3
Placement of I/O Signal Lines
If exclusive grounding is not possible, use
a common connection point. [diagram
(b)]
If the equipment does not function
properly when grounded, disconnect
the ground wire from the FG terminal.
*1
Use a grounding resistance of less than 100
Ω
and a 2mm
2
or greater thickness wire,
or your country’s applicable standard. For details, contact your local GP distributor.
Do not use common grounding, since it can lead to an
accidet or machine malfunction.
CAUTIONS
