Nibe SMO 40 - Scheduling Indoor Climate

Optional connections
LOAD MONITOR
When many power consumers are connected in the
property at the same time as the electric additional heat
is in operation, there is a risk of the property’s main
fuses tripping. SMO 40 has an integrated load monitor
that controls the power steps for the electric additional
heat by disconnecting step by step in event of overload
in a phase. Reconnection occurs when other current
consumption is reduced.
Connecting current sensors
A current sensor (BE1 - BE3) must be installed on each
incoming phase conductor into the electrical distribution
unit, to measure the current. The electrical distribution
unit is an appropriate installation point.
Connect the current sensors to a multi-core cable in an
enclosure next to the electrical distribution unit. Use
unscreened multi-core cable of at least 0.5 mm², from
the enclosure to SMO 40.
Connect the cable to the input board (AA3) on terminal
block X4:1-4 where X4:1 is the common terminal block
for the three current sensors.
The value for the size of the fuse is set in menu 5.1.12
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.
LPEN
1
L
2
L
3
Electrical distribution
unit
Control module
Incoming electricity
L N 1 1 0 2 3 4PE
1 2 3 4
LEK
123456
SMO
E
xternt
External
SMO40
BE3
BE2
BE1
AA3-X4
L N 1 1 0 2 3 4PE
1 2 3 4
LEK
AA3-X4
If the installed heat pump is frequency controlled, it will
be limited when all power stages are disengaged.
CONNECTING EXTERNAL ENERGY METER
NOTE
Connection of external energy meter requires
version 35 or later on input board (AA3) as well
as "display version" 8762 or later.
One or two energy meters (BE6, BE7) are connected to
terminal block X22 and/or X23 on input board (AA3).
1
2
3
P
roduktNamn
Extern energimätare
+5V
SMO40
AA3-X22/23
External
AA3-X22/23
L N 1 1 0 2 3 4PE
1 2 3 4
LEK
Activate the energy meter(s) in menu 5.2.4 and then set
the desired value (energy per pulse) in menu 5.3.21.
STEP CONTROLLED ADDITIONAL HEAT
NOTE
Mark up 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 permitted immersion heater output together with
the compressor to conclude the hot water charging and
return to charging the heating as soon as possible. This
only occurs when the number of degree minutes is be-
low the start value for the additional heat.
27Chapter 5 | Electrical connectionsNIBE SMO 40