Weidmuller SAI Active Universal Pro Series, Manual

Page: 25 / 177

Mounting SAIs
5663600000/1.4/09.09 25
Functional earth (FE)
The functional earth is the grounding of equipment
to its surroundings. Contrary to the protective earth
(PE) the FE does not primarily serve to protect
equipment or persons, but to discharge electrostatic
charges, shield connections etc.
CAUTION! EMC
Electromagnetic pulses affect cabling
and the distributor during operations.
Flawed signals and false data can re-
sult. SAI distributors from the SAI Active
Universal series are equipped with an
FE connection integrated at the mount-
ing hole in the bus/power section. Use
this connection and fix the distributor di-
rectly to a conductive surface or attach a
short, low impedance FE cable to the
fixing screw by means of a cable lug.
Important: Do not use a PE conductor
for the FE connection.
Please refer to Figure Functional earth
(FE) connection.
Figure 10 Functional earth (FE) connection
Required accessories / DIN components
2 socket-head cap screw M4 x 30
We recommend cylinder head studs with hexagon-
socket or Torx type.
Tools
Allen key or Torx screwdriver appropriate to the
screw you choose.
You can find tool recommendations in
Appendix A: Product Overview.
4.3