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Installation and commissioning
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D000011142 en k – E65C CU-B1, B2, B4 – User Manual
5.4.1
Connecting the signal inputs
Connect the signal inputs of the communication unit CU-Bx as follows
according to the connection diagram:
1.
Shorten the connecting wires of the signal inputs and outputs to the re-
quired length and strip them for approx. 4 mm (wires and strands up to
2.5 mm
2
can be connected).
2.
If stranded wire is used, it is recommended to provide it with ferrules
for connection.
3.
Connect the connecting wires of the signal inputs and outputs as
follows to the screwless spring-loaded terminals (the terminals are
numbered as shown on the connection diagram):
– Insert a size 1 screwdriver in the upper opening and insert it turning
slightly upwards (Fig. 17 A).
– Now place the stripped connecting wire in the lower opening and
hold it there securely (Fig. 17 B).
– Withdraw the screwdriver. The connecting wire is then firmly fixed
(Fig. 17 C).
ap
pr
ox
. 4
m
m
A B C
Fig. 17 Connection in screwless spring-loaded terminals
Correct length of insulation
The insulation of the connecting line must extend as far as the terminal
indentation, i.e. there must be no further bare part of the connecting line
visible above the terminal edge (as shown in Fig. 17 C). Touching live parts
is dangerous to life. The stripped part of the connecting wire should be
shortened if necessary.
If a connecting wire must be disconnected again for any reason, this is
performed in the reverse sequence:
A B C
Fig. 18 Releasing connection from spring-loaded terminal
