User manual

Magelis XBT OT User Manual
4-12
4.2.3 Grounding
This section describes the precautions for grounding the OT unit.
• When supplying power to the OT unit, be sure to separate the
input/output and power lines, as shown. [diagram (a)]
• If exclusive grounding is not possible, use a common
grounding point, [diagram (b)]. A D-type grounding or
equivalent should be used for the grounding point.
WARNING
UNINTENDED EQUIPMENT OPERATION
• Do not use common grounding, since it can lead to an accident or machine breakdown.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
• Check that the grounding resistance is
100Ω or less.
• FG and SG terminals are internally
connected in the OT. When connecting
an external device to the OT using the
SG terminal, be sure to check that no
short-circuit loop is created when you
setup the system.
• The grounding wire should have a
cross sectional area greater than
2mm
2
[0.078
2
]. Create the grounding
point as close to the OT 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.
• If the equipment does not function
properly when grounded, disconnect the
ground wire from the FG terminal.
(a) Exclusive Grounding (BEST)
(b) Exclusive Grounding (OK)
(C) Common Grounding (Not OK)
OT
OT
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Equipment
OT
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