ABB i-bus
£
KNX
Planning and application
© 2010 ABB STOTZ-KONTAKT GmbH
137
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 not be controlled with the Fan Coil Actuator. 2 or 3-point valve
drives are controlled via switching of the supply voltage.
2-point valve drives are controlled via the commands OPEN and CLOSE.
The valve can 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 can not be
controlled with the Fan Coil Actuator.
The Fan Coil Actuator supports the control of electric motor 3-point valve
drives. These are connected via three connection cables to the Fan Coil
Actuator: Neutral conductor, switched phase to OPEN, switched phase for
CLOSE. Using 3-point control valve drives, the valve can be opened by any
desired percentage and the position can be retained over an extended
period. If the valve does not move, 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 is used in most cases is continuous control.
Alternatively, an electric motor valve drive is controlled via pulse width
modulation. Thereafter, the valve is opened fully each time for a few minutes
and then it is closed again.
4.3.2 Electro-thermal
valve drives
Electro-thermal drives are adjusted due to heat expansion of a material
caused by a flow of electric current. Electro-thermal valve drives are
controlled by pulse width modulation.
The Fan Coil Actuator supports the control of electro-thermal valve drives via
pulse width modulation.
Electro-thermal valve drives are offered in the
de-energised 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.
Electro-thermal valve drives connected via two connection cables to
the Fan Coil Actuator.
Summary of Contents for i-bus KNX FCA/S 1.1M
Page 1: ...ABB i bus KNX Fan Coil Actuator FCA S 1 1M Product Manual ...
Page 2: ......
Page 6: ......
Page 158: ......
Page 162: ...ABB i bus KNX Appendix 2010 ABB STOTZ KONTAKT GmbH 160 Notes ...
Page 163: ......