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ST Series User’s Manual
3-10
3.2.3 Grounding
(a) Exclusive Grounding (BEST)
*1
• Connect the FG terminal found at the Power Plug to
an exclusive ground. [diagram (a)].
(b) Common Grounding (OK)
*1
• If exclusive grounding is not possible, use a common
connection point. [diagram (b)]
Do not use common grounding, since it can lead to an accident or machine breakdown.
• When connecting an FG ground wire to the Power Plug's FG terminal, be sure to
create an exclusive ground. Check that the grounding resistance is less than
100
Ω
.
• Inside the ST400-AG41-24V/ST401-AG41-24V/ST402-AG41-24V/ST403-AG41-
24V unit, the SG (Signal Ground) and FG (Frame Ground) terminal are con-
nected to each other.
• 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 ST 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.
*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.
• If the equipment does not function properly when grounded, disconnect the ground wire from
the FG terminal.
ST Unit
Other
Equipment
ST
Other
Equipment
ST
Other
Equipment