Siemens SIMATIC NET PROFIBUS manual Instructions for Installing Fine Protection

Lightning and Surge Voltage Protection for LAN Cables Between Buildings

B.2.2 Instructions for Installing Fine Protection

The fine protection should be installed as close as possible to the first bus node following the coarse protection.

The following are required to install the fine protection:

SThe base section type no. 919506,

SThe protection module MD/HF type no. 919570, and

SThe shield contact terminals type no. 919508

The fine protection should be connected to the reference ground of the first bus node (for example grounded DIN rail when installing in a cubicle). When installing the fine protection outside cubicles (IP 65 area or higher) this must be installed in

Sprotective casing, type no. 906055

as described in the installation instructions for the coarse protection.

Figure B-3 Fine Protection in the cubicle Close to the First Bus Node

B-6	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000