Grundfos Direct Sensors (Vfs); Pwm Outputs; Power Supply - Sonnenkraft SKSC2HE Manual Del Usuario

1.2.1. Grundfos Direct Sensors (VFS)

The controller is equipped with 1 input for a dig-
ital Grundfos Direct Sensor (VFD) for measuring

1.2.2. PWM outputs

The speed of a HE pump is adjusted through a
PWM signal. In addition to connection to the re-
lay, the pump must be connected to one of the
PWM outputs of the controller.
Power is supplied to the HE pump by switching
the corresponding relay on or off.

1.2.3. Power supply

the flow rate and the temperature. Connection
is made at the terminals VFD2 (bottom left).
The terminals marked „PWM / 0-10 V" are control
outputs for pumps with PWM control input.
PWM 1/2 (upper left):
In Arrangement 3, the second PWM output is
used as a 0-10 V output for a modulating boiler
demand.
The power supply is effected to the clamps:
19 = neutral conductor N
20 = conductor L
12 = protective earth conductor
The controller comes with a VBus
munication and energy supply of external mod-
ules. The connection is effected with optional
polarity at the clamps marked with „VBus". Via
this data Bus you can install one or more VBus
modules, e.g.:
• large display GA3 / SD3
• Data logger, DL2
GB
for data com-
®
®
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