Pro-face LT series, Hardware Manual

Page: 42 / 143

LT System General Rules for Implementing
42
Exclusive Grounding
Connect the frame ground (FG) terminal on the power plug to an exclusive ground.
When supplying power to the LT unit, be sure to separate the input, output and
power lines, as shown.
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:
z
Do not use common grounding, since it can lead to accidents and machine
breakdown.
z
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.