User`s manual

Chapter 3 - Installation and Wiring
GP-477R/577R Series User's Manual
3-8
• Connect a surge absorber, as
shown in the diagram, to deal with
power surges.
• To avoid excess noise, make the
power cable as short as possible.
• Make sure the surge absorber (E1)
is grounded separately from the
GP unit (E2).
• Select a surge absorber that has a
maximum circuit voltage greater
than that of the peak voltage of the
power supply.
Connect the FG terminal found at
the back of the unit to an exclu-
sive ground. [diagram (a)].
Check that the grounding
resistance is less than 100
ΩΩ
ΩΩ
Ω .
The grounding wire should
have a cross sectional area
greater than 2mm
2
. Set the
connection point as close to
the GP unit, and make the
wire as short, as possible.
When using a long ground-
ing wire, replace the thin
wire with a thicker wire
placed in a duct.
If exclusive grounding is not
possible, use a common connec-
tion point. [diagram (b)]
If the equipment does not func-
tion properly when grounded,
disconnect the ground wire from
the FG terminal.
GP unit
other equipment
GP unit
other equipment
GP unit other equipment
surge
absorber
GP unit
!!
!!
!
Important
Do not place regular electric wires over wires used for earthing the GP,
since it can lead to an accident or machine malfunction.
Caution
!!
!!
!
4. Grounding the GP
(a) Exclusive grounding (BEST)
(b) Common grounding (OK)
(c) Common grounding (Not OK)
Note:
!!
!!
!
Important