BCU 560, BCU 565 · Edition 02.16
108
Project planning information > Electrical connection
13 .3 .2 Safety current inputs
Actuation of the safety current inputs only with switchgear fea-
turing mechanical contacts. If switchgear with semi-conductor
contacts is used, the safety current inputs must be connected
using relay contacts.
To safeguard the safety current inputs, the fuse must be de-
signed so that the sensor with the lowest switching capacity
is protected.
The cabling outside enclosed installation spaces must be
protected from mechanical damage and stress (e.g. vibration
or bending) and from short-circuits, short-circuits to ground
and cross-circuits.
1
2
3
46
45
65
66
67
68
49
50
51
17
18
37
38
13
14
15
N
L1
V1
V2
V3
max. 1 A;
24 V DC,
250 V AC
BCU 560..F0
3,15AT
µC
88
P70
P69
P70
P73
P72
P72
c
c
ϑ
0 V
+24 V
41
42
24V
DC
HT
LDS
p
u
2
GZL
PZL
P
5 6
9
11 12
10
7
62 61
I
Z
(BCU 560..F3 only)
(BCU 560..F3
only)
0.6 × I
N
Calculation
I
N
= current of the sensor/contactor with the lowest switching
capacity
Suitable fuse = 0.6 × I
N
