Digital Electronics GP-2401 Series, Руководство пользователя

Страница: 50 / 139

3-9
Chapter 3 - Installation and Wiring
GP-2401/2501/2601 Series User Manual
3.2.3 Grounding
(a) Exclusive Grounding (BEST)
*1
Connect the FG terminal found at the
back of the GP to an exclusive ground.
[diagram (a)].
(b) Common Grounding (OK) *1
• Check that the grounding re-
sistance is less than 100
Ω Ω Ω Ω Ω
.
• The SG and FG terminals are
connected internally in the GP
unit.
• When connecting the SG line
to another device, be sure
that the design of the system/
connection does not produce
a shorting loop.
• The grounding wire should
have a cross sectional area
greater than 2mm
2 . Create
the connection point as close
to the GP unit as possible,
and make the wire as short,
as possible. When using a
long grounding wire, replace
the thin wire with a thicker
wire, and place it 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.
3.2.4 I/O Signal Line Placement
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 termi-
nal.
*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
accident or machine breakdown.
CAUTION