Safety Current Inputs - Honeywell Krom Schroder BCU 580 Technical Information

Project planning information

12 .3 .2 Safety current inputs

Actuation of the safety current inputs only with switch-
gear featuring 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
designed 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.
BCU 580 · Edition 11.15l
p
u PZL GZL
2
HT
P
P70 P69
P70 P70
0,6 × I
N
L1 +24 V
Calculation
I = current of the sensor/contactor with the lowest
N
switching capacity
Suitable fuse = 0.6 × I
N
ϑ1
ϑ2
P71
P72 P72
P73
I
62 61
106