21
ABB i-bus
®
EIB / KNX
The Fan Coil Controller can control the following valve drives:
– Electromotive valve drives
– Electrothermal valve drives
– EIB valve drives
Electromotive valve drives
Electromotive valve drives close and open valves via a small electric motor.
Electromotive valve drives are available as proportional, two-step or raise/
lower valve drives.
Proportional valve drives are controlled via an analogue signal (e.g. 0...10 V).
Continuous-action control is used as the control type (see Chapter 3.5.3).
Two-step or raise/lower valve drives are controlled via the switching of the
supply voltage. Proportional valve drives cannot be regulated with the Fan
Coil Controller.
Two-step valve drives are controlled via the commands “open” and
“closed”. The valve can only be fully opened or fully closed.
Two-step valves are controlled via two-step control or pulse width
modulation (see Chapter 3.5.3). Two-step valve drives can likewise not
be controlled with the Fan Coil Controller.
The Fan Coil Controller supports the control of electromotive raise/lower
valve drives. These valve drives are connected to the Fan Coil Controller
via three connecting cables: neutral conductor, switched phase for open,
switched phase for closed (see Fig. 12). With raise/lower valve drives, the
valve can be opened to any percentage value and this position is retained
for a longer period. If the valve is not moved, no voltage is applied at the
motor.
Fig. 12: Connection of electromotive raise/lower valve drives
The valve is opened so that precisely the right amount of hot or cold water
can flow through in order to bring the heat exchanger to the required
temperature. The valve is thus regulated via the valve opening (0...100 %).
Continuous-action control can be applied in most cases (see Chapter 3.5.3).
Alternatively, an electromotive valve drive can also be regulated via
two-step control or pulse width modulation. The valve is fully opened for
several minutes and then closed again (see Chapter 3.5.3).
Application and planning
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3.5
Valve drives, valves and
controllers
3.5.1 Valve
drives
