BCU 580 · Edition 11.15
100
12 .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) as well as short-circuits, short-circuits to ground
and cross-circuits.
17
18
37
38
N
max. 1 A;
24 V DC,
250 V AC
BCU 580
3,15AT
µC
88
c
c
0 V
+24 V
41
42
24V
DC
9
11 12
10
62 61
230V
1
2
3
4
L1
ϑ1
P70
ϑ2
P70
P70
P69
P73
P72
P72
HT
p
u
2
GZL
PZL
P71
0,6 × I
N
46
45
65
66
67
68
49
50
51
5 6 7 8
13
14
15
57
V1
V2
V3
V4
A
53
54
55
56
P
M
I
Calculation
I
N
= current of the sensor/contactor with the lowest switching
capacity
Suitable fuse = 0.6 × I
N
Project planning information > Electrical connection
