
6
Electrical Installation
Application example – Combined heat and power station without
operating contacts
N
L
1
M
L
N
3
K3
A1
A2
6
5
GND
24 VDC
A combined heat and power station (3)
without operating contacts (3) can be
wired up as shown in the left figure.
A current-operated relay (K3) detects
whether the station (3) is currently
active.
If the normally open contacts of K3
close, the digital CHP input will be
activated.
1
Signal line
2
Digital input CHP
3
CHP
K3 Current-operated relay
Figure 34: CHP without operating
contacts
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KD-421 | Part no. 22136 | EN | X03