6
Electrical connection
6.5.2 Using the ‘PV reduction’ digital outputs
Using the PV reduction digital outputs – PV reduction 1 and 2 – is a good idea if
the feed-in power of the PV system must not exceed a fixed value (feed-in limit).
The PV reduction digital outputs can be used to automatically control the output
power of the PV inverter so that the feed-in power does not exceed the required
value in a 10-minute average interval.
The digital outputs cannot be used directly. Additional relays are required, which
are not included in the scope of delivery.
Figure 31:
PV Reduction
1
Signal line
2
Earth (GND)
3
DO PV reduction 1
4
DO PV reduction 2
5
PV inverter with suitable
interface for power control
K71
External relay (not
included in scope of
delivery)
K72
External relay (not
included in scope of
delivery)
GND
A1
A2
A1
A2
5
1
K71
K72
K71
K72
2
3
4
Level
K71
K72
0
1
2
3
Tabelle 5: Make contact positions of K71
and K72 relays depending on activated
level
Function
Relays K71 and K72 are connected to the green (PV reduction 1) and yellow (PV
reduction 2) wires, respectively. If PV reduction 1 is activated (24 V DC applied to
the green wire), K71 energises and the K71 make contact closes. K72 energises as
soon as PV reduction 2 is activated (24 V DC applied to the yellow wire).
PV reductions 1 and 2 are activated/deactivated automatically by the storage
system depending on the current feed-in power. If the feed-in power is within the
permissible range, PV reduction 1 and PV reduction 2 are deactivated. K71 and K72
are not energised. This corresponds to level 0. As soon as a power reduction is
required, K71 and K72 are energised according to the data provided in the left-hand
table. If level 1 does not achieve the desired effect, for example, then level 2 is
activated, and so forth.
page 36 of 63
KD-291 | Part no. 52187 | EN | X01
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