Planning And Application; Introduction; Valve Drives, Valves And Controller; Electromotor Valve Drives - ABB i-bus KNX Product Manual

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ABB i-bus KNX

Planning and application

12 Planning and application
12.1

Introduction

In this chapter you will find some tips and application examples for practical use of the device.
Application examples and practical tips on the topic of temperature control, valve drives, characteristic
curve adjustment etc., can be found in the Application manual Heating/Ventilation/Air-Conditioning
at www.abb.com/knx.
12.2

Valve drives, valves and controller

12.2.1

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 analog signal, e.g. 0...10 V. 2 or 3-point valve drives are
controlled via switching of the supply voltage.
2-point valve drives are controlled via the values Open and Close. The valve knows only the states "Open"
and "Closed". 2-point valves are controlled via a 2-point control or pulse width modulation (PWM).
3-point valve drives are connected via three connecting cables. The opening and closing lines are
connected to terminals A and B. Using 3-point valve drives, the valve can be opened by any desired
percentage and this position can be retained without further energy expenditure. If the valve does not
move, no voltage is applied to the motor.
The control usually used in most cases is continuous control.
The VC/S can actuate electromotor valve drives only via PWM because there is only one valve output
available on each channel.
12.2.2

Electrothermal Valve Drives

Electrothermal Valve Drives are adjusted due to heat expansion of a material caused by a flow of electric
current. Electrothermal Valve Drives are controlled by pulse width modulation or two-point control.
Electrothermal Valve Drives are offered in the de-energized closed and de-energized open 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.
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 231