Siemens CS 275 manual Configuring notes and ordering data

This catalog is out of date, see note on page 2

Overvoltage protection

Configuring notes and ordering data

AF	Connector board ”Remote bus”	GS	Coarse overvoltage protection	Cable lengths: a	< 25 m
ES	Grounding rail	IK	Inhouse cable	b 25 to 50 m
FE	Foundation earth	PA	Equipotential bonding	c	< 50 m
FK	Standard remote bus cable	T	Participant
FS	Fine overvoltage protection

Fig. 4/25 Application of coarse and fine overvoltage protection components with different lengths of cable

Configuring notes

The coarse overvoltage protection must be provided for all re- mote bus cables prior to their exit points from the building and also in the immediate vicinity of the foundation earth connection. The connection between the coarse protection and the founda- tion earth must be kept as short as possible.

The coarse protection is also recommended if the remote bus connects cabinet groups which are positioned more than 50 m from one another within a building. In this case the coarse protection must be installed directly next to the last participant before the longer inhouse cable, and connected to the potential earth of the cabinet.

The fine protection must be provided for each bus participant which is directly connected to a coarse protection component. Fine protection is required for both participants if the distance between the bus participants is > 25 m.

The cable clamps for the various types of remote bus cable are included in the delivery of the overvoltage protection.

Ordering data

	Order No.
Coarse overvoltage protection	6DS9 208-8AA
for the CS 275 bus system
Fine overvoltage protection	6DS9 210-8AA
for the CS 275 bus system
For further information refer to:	Order No.
”TELEPERM M, instructions and
guidelines for planning, installation and operation”
German	C79000-G8000-C417
English	C79000-G8076-C417

Siemens PLT 130 . 1994 4/17