Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 41)

LT-4201TM/4301TM Hardware Manual
41
Common Grounding
If exclusive grounding is not possible, use a common grounding point. Use grounding resistance
of 10
Ω or less, wire thickness of 2.6 mm or more, or your country’s applicable standard for the
grounding point.
Precautions:
 Do not use common grounding, since it can lead to accidents and machine breakdown.
 If the equipment does not function properly when grounded, disconnect the ground wire from
the FG terminal.
Grounding Procedure
NOTE: FG and SG terminals are internally connected in the LT. When connecting an external
device to the LT using the SG terminal, be sure to check that no short-circuit loop is created when
you setup the system.
Step Action
1 Check that the grounding resistance is less than 100 Ω.
(Grounding resistance of 100 Ω or less, wire thickness of 1.6 mm or more, or
your country’s applicable standard.)
2 Create the connection point as close to the 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.