Pro-face FP5000 Series, User Manual

Page: 66 / 95

Installation and Wiring
66
Grounding
Exclusive Grounding
Always ground the FG (functional ground) terminal. Be sure to separate this product from the FG
of other devices as shown below.
Precautions

Check that the grounding resistance is 100

or less
*1
.

The FG wire should have a cross sectional area greater than 2 mm
2
(AWG14)
*1
. Create the
connection point as close to this product 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.

The SG (signal ground) and FG (functional ground) terminals are connected internally in this
product. When connecting the SG line to another device, be sure that no shorting loops are
formed.
*1 Observe local codes and standards.
Common Grounding
Electromagnetic interference (EMI) can be created if devices are improperly grounded. EMI can
cause loss of communication. If exclusive grounding is not possible, use a common grounding
point as shown in the configuration below. Do not use any other configuration for common
grounding.
Correct grounding
Incorrect grounding