User manual

Chapter 3 – Installation and Wiring
3–8 LT Series User Manual
3.2.2 Grounding
Do not use common grounding, since it can lead to an acci-
dent or machine breakdown.
CAUTION
(A) Exclusive Grounding (BEST)
Connect the FG terminal found on the back of the LT to an exclusive ground
(diagram A).
(B) Common Grounding (OK)
• Make sure that the grounding resistance is less than 100
ΩΩ
ΩΩ
Ω.
• FG and SG terminals are internally connected in the LT. When connect-
ing to another device, be sure to not create an SG shorting loop in your
system.
• The grounding wire should have a cross-sectional area of at least 2mm
2
.
Create the grounding point as close to the LT unit as possible, and keep
the wires as short as possible. Replace all thin wires with thicker wires,
and place them in a duct.
(C) Common Grounding (Not OK)
If the equipment does not function properly when grounded,
disconnect the ground wire from the FG terminal.
If exclusive grounding is not possible, use a common connection point (dia. B).
Other
Equipment
Other
Equipment
Other
Equipment
LT
LT
LT