Connect the current sensors to a multi-core cable in an
enclosure directly adjacent to the electrical distribution
unit. The multi-core cable between the enclosure and
SMO S40 must have a cable area of at least 0.5 mm².
Connect the sensor to terminal block AA100-X14:BE1-
BE3 and to any terminal block on AA100-X13:GND.
The value for the size of the fuse is set in menu 7.1.9
to correspond with the size of the property’s main fuse.
Here it is also possible to adjust the current sensor’s
transformer ratio.
Enclosed current sensors have a transformer ratio of
300 and, if these are used, the incoming current must
not exceed 50 A.
NOTE
The voltage from the current sensor to the in-
put board must not exceed 3.2 V.
Electrical
distribution unit
NIBE product
Incoming electricity
+5V
0-5V
BE1
BE2
BE3
BE1
AA100-X13
AA100-X14
BE2
BE3
3
4
5
6
7
NOTE
If the installed heat pump is frequency con-
trolled, it will be limited when all power stages
are disengaged.
STEP CONTROLLED ADDITIONAL HEAT
NOTE
If external voltage is used, mark any junction
boxes with warnings for external voltage.
Step-controlled additional heat before the
reversing valve
External step-controlled additional heat can be controlled
by up to three potential-free relays in the control module
(3 step linear or 7 step binary).
The electric additional heat will charge with the maxim-
um number of steps, together with the compressor, to
finish the hot water charging and return to charging the
heating as soon as possible. This only occurs when the
number of degree minutes is below the start value for
the additional heat.
Step-controlled additional heat after the
reversing valve
External step-controlled additional heat can be controlled
by two relays (2 step linear or 3 step binary), which
means that the third relay is used to control the immer-
sion heater in the water heater/accumulator tank.
With the AXC 30 accessory, a further three potential-
free relays can be used for additional heat control, which
then gives an additional 3 linear or 7 binary steps.
Step in occurs with at least 1 minute interval and step
outs with at least 3 seconds interval.
Step 1 is connected to terminal block AA100-X8:1.
Step 2 is connected to terminal block AA100-X8:2.
Step 3 is connected to terminal block AA100-X8:3.
The settings for step controlled additional heat are made
in menu 7.1.5.
If the relays are to be used for operating voltage, bridge
the supply from terminal block AA100-X4:L to terminal
block AA100-X8:C.
1 2 3C
Styrmodul
L L L L
N N N N N NN
AA100-X3
AA100-X4
AA100-X8
Externt
NIBE SMO S40Chapter 5 | Electrical connections22
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