Valve Drives, Valves And Controller; Electromotor Valve Drives; Electrothermal Valve Drives - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Planning and application
4.3

Valve drives, valves and controller

4.3.1

Electromotor Valve Drives

Electromotor Valve Drives open and close valves via a small electric motor. Electromotor valve drives are
offered as proportional or as 2 or 3-way valve drives.
Proportional valve drives are controlled via an analogue signal, e.g. 0...10 V. They can be controlled with
the device. 2 or 3-point valve drives are controlled via switching of the supply voltage.
2-point valve drives are controlled via the telegrams OPEN and CLOSE. The valve can only be completely
open or completely closed. 2-point valves are controlled via a 2-point control or pulse width modulation
(PWM). 2-point valve drives which require 2-point control cannot be controlled with the device.
The device supports the control of electric motor 3-point valve drives. These are normally connected via
three connection cables to the device: neutral conductor, switched phase for OPEN, switched phase for
CLOSE. Using 3-point valve drives, the valve can be opened to any desired percentage and the position
can be retained over an extended period. If the valve is not moved, no voltage is applied to the motor.
The valve is opened wide enough to allow the exact quantity of hot or cold water to flow that is required to
bring the heat exchanger to the required temperature. Thus the valve is controlled via the valve opening
(0...100%). The control usually used in most cases is continuous control.
4.3.2

Electrothermal Valve Drives

Electrothermal Valve Drives are adjusted by the thermal expansion of a material caused by a flow of
electric current. Electrothermal Valve Drives are controlled via pulse width modulation. The device
supports the control of Electrothermal Valve Drives via pulse width modulation.
Electrothermal Valve Drives are offered in the de-energized closed and de-energized opened variants.
Depending on the variant, the valve is opened when voltage is applied and closed when no voltage is
applied, or vice versa.
Electrothermal Valve Drives are connected via two connection cables to the device.
FCA/S 1.x.x.1 | 2CDC508134D0202 247