STIEBEL ELTRON SOM 10 - Manual (Page 6)

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2.2 Electrical connection
WARNING! ESD damage!
Electrostatic discharge can lead to
damage to electronic components!
Î Take care to discharge pro-
perly before touching the
inside of the device! To do
so, touch a grounded surface
such as a radiator or tap!
Note:
The pump speed must be set to 100 % when
auxiliary relays or valves are connected.
input for analog
Grundfos Direct
Sensors™
input for digital
Grundfos Direct Sensors™
potential-free
changeover relay
sensor
grounding common terminal block
sensor terminals
protective grounding
conductor common
terminal block (PE)
neutral conductor
common terminal
block
Note
For more details about the initial commissi-
oning procedure, see page 12.
Note
Connecting the device to the power supply
must always be the last step of the instal-
lation!
The controller is equipped with 14 relays in total to
which loads such as pumps, valves, etc. can be con-
nected:
Relays 1 ... 13 are semiconductor relays, designed for
pump speed control:
Conductor R1 ... R13
Neutral conductor N (common terminal block)
Protective grounding conductor (common termi-
nal block)
Relay 14 is a dry contact relay:
R14-A = normally open contact
R14-M = center contact
R14-R = normally closed contact
WARNING! Electric shock!
Upon opening the housing, live
parts are exposed.
Î Always disconnect the con-
troller from power supply
before opening the housing!
Depending on the product version, power supply
cables and sensor cables are already connected to
the device. If that is not the case, please proceed as
follows:
Temperature sensors have to be connected to the
terminals S1 ... S12 and GND (either polarity).
PWM (0-10 V)
terminals
VBus ®