STIEBEL ELTRON SOM 6 PLUS User Manual
Page 5
5
1.3 Data communication/ Bus
The controller is equipped with a
VBus
®
for data transfer with
and energy supply to external modules. The connection is
carried out at the terminals marked “VBus” (either polarity).
One or more VBus
®
modules can be connected via this data
bus.
By means of a DL2 datalogger or an interface adapter, the
controller can be connected to a PC or a computer network.
VBus
®
connection terminals
The controller is equipped with a semiconductor relay, to
which a
load such as a pump, a valve etc. can be connected:
• Relay 1
18 = conductor R1
17 = neutral conductor N
13 = ground conductor
The
power supply is to be carried out at the terminals:
19 = neutral conductor N
20 = conductor L
12 = ground terminal
The
temperature sensors (S1 up to S4) are to be connected
to the following terminals with either polarity:
1 / 2 = Sensor 1 (e.g. Sensor collector)
3 / 4 = Sensor 2 (e.g. Sensor tank)
5 / 6 = Sensor 3 (e.g. Sensor tank top)
7 / 8 = Sensor 4 (e.g. Sensor return)
All Pt1000 temperature sensors are equipped with a platinum
measuring element in their tip. The electrical resistance of the
measuring element changes in relation to the temperature
(see table in chap. 5).
The difference between
FKP and FRP type sensors only lies in
the cable insulation material. The insulation material of FKP
type sensor cables resists a higher temperature, so that FKP
type sensors should be used as collector sensors. FRP type
sensors are best used as reference sensors in tanks or pipes.
L
N
R1
N
20
19
18
17
14
13
12
1 (1) A (100 ... 240) V~
R1
1
2
S1
S2
S3
3
4
5
6
Temp. Sensor
Pt1000
S4
7
8
Sensor terminals S1 ... S4
Grounding and load terminals