8
3.
Grounding Cautions
• Be sure to create an exclusive ground for
the Power Cord’s FG terminal. Use a
grounding resistance of 100
Ω
, a wire of
2mm
2
or thicker, or your country’s applica-
ble standard.
• The SG (signal ground) and FG (frame
ground) terminals are connected internally
in the GP unit.
When connecting the SG line to another
device, be sure that the design of the sys-
tem/connection does not produce a short-
ing loop.
• The grounding wire should have a cross
sectional area greater then 2mm
2
. Create
the connection point as close to the GP 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.
4.
Input/Output Signal Line Cautions
• All GP Input and Output signal lines must
be separated from all operating circuit
(power) cables.
• If this is not possible, use a shielded cable
and ground the shield.
To prevent the USB cable
from coming off
• When using USB Host Interface in
Hazardous Locations provided in
UL1604, please fix the USB cable with
the USB Holder.
• When using USB Host Interface in
Hazardous Locations, it is necessary
to meet the following requirements.
a) Use the associated USB Cable
Clamp:
CA5-USBATL-01 (made by Pro-face)
b) Use the USB cable with the housing
that suits the associated USB Cable
Clamp:
CA3-USBCB-01 (made by Pro-face)
or USB cable with the housing of the
same size as CA3-USBCB-01
(If USB cable with a small housing is
used, it may not be securely fixed.)
Attaching the USB Holder
(1) Before starting the procedure, lift up the
tab on both sides of the USB Holder and
remove the USB Cover.
GP unit
Other
Equipment
Exclusive Grounding
(BEST)
GP unit
Other
Equipment
Common Grounding (OK)
GP unit
Other
Equipment
Common Grounding
(Not OK)
Tab
