2
02
0-
12
30
K-System – Isolated Barriers
Mounting and Installation
Figure 3.7 Conventional installation
3.2.3.2
Power Supply with Power Rail
For devices with a 24 V DC supply voltage, use of the Power Rail reduces wiring and
installation costs. The Power Rail almost completely eliminates the risk of wiring faults
and facilitates expansion.
Power is supplied to the Power Rail via a power feed module which provides a voltage
of 24 V DC (max. 4 A) to a maximum of 80 devices.
The power feed module features a replaceable 5 A fuse at the front. This fuse ensures
that the Power Rail and connecting contacts are protected. It prevents damage caused
by reverse supply voltage or by installing too many isolators. The isolators on the Power Rail
feature integrated device fuses. Any faults in the isolator or in the signal leads do not affect
the Power Rail supply system. The 5 A fuse permits a rated current of up to 4 A across
the entire temperature range.
The power feed module also has the task of outputting a collective error message or power
failure of the isolators via a separate relay output.
Alternatively, supply of the Power Rail can be provided using the power supply
KFA6-STR-1.24.*. In this case, no collective error message is possible.
1
DIN mounting rail
1
3
4
6
2
5
1
3
4
6
2
5
1
3
4
6
2
5
1
3
4
6
2
5
13
12
9
10
7
14 15
11
8
13
12
9
10
7
14 15
11
8
13
12
9
10
7
14 15
11
8
13
12
9
10
7
14 15
11
8
1
24 V DC
