STIEBEL ELTRON SOM 9s - Manual (Page 68)

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SOM 9s
Electrical connection of a high-efficiency pump (HE pump)
Speed control of a HE pump is possible via a PWM signal.
For this purpose, the pump has to be connected to the relay
as well as to one of the PWM outputs of the controller (see
page 4). In the PUMP adjustment channel one of the
PWM control types has to be selected.
note:
For more information about pump control, see
page 79.
R1
S2
S1
Temp. Sensor
Pt1000
L R3 R2 R1
GND
S1 S2 S3 S4 S5 VBus PWM
1
PWM
2
N
R4 V40 L'
VFS
RPS
out in