Hirschmann 943 893-321, Руководство пользователя

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5 Installation 5.7 Connecting the electric bus cables
22
Version 1.0 03/06
There is no contact separation between the bus
lines and the connection for the function ground.
Therefore please observe the following safety
instructions:
䊳
Do not use bus lines to connect repeaters to device
parts which have a different earth potential.
The different voltages could destroy the repeaters!
䊳
Do not connect bus lines which are partly or entirely
laid outside buildings. If lightening strikes close by,
this could destroy the repeaters. Use F/O cables for
bus connections outside buildings!
䊳
The shield of the data cable, together with the
function ground connection, must be connected to
an equipotential rail in the switch cabinet. The equi-
potential rails of the switch cabinets, which are con-
nected to one another by means of an electrical RS
485 bus cable, must have a low-impedence con-
nection to one another.
䊳
The function ground of the repeater is effected by
means of the
connection of the screw terminal
block on top of the device.
5.7 Connecting the electric bus cables
RT+
K1+
K1+
K1-
K1-
RT-
Bus
line
Fig. 13: Connecting the bus cables to the 6-pin screw terminal
block
䊳
The bus cables are connected by means of the
plugable screw terminal block on the front of the
device.
D To connect the cables, loosen the screws on the top
section and remove it.
After connecting the bus cables and then plugging
them in, do not forget to re-fasten the screw terminal
block.
5.8 Connecting the function ground