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ABB i-bus
EIB / KNX
4.4
Operating mode:
"Heating actuator"
4.4.1
Parameter window:
"General"
© 2004 ABB STOTZ-KONTAKT GmbH
Project design and programming
The function "Heating actuator" switches an electronic relay which is
generally used to control an electrothermal valve drive. The device is
normally controlled by a room thermostat. Various types of control are
possible (e.g. continuous-action control).
Parameter: "Connected valve type"
It can be set in this parameter whether a valve should be controlled as
"normally closed" or "normally open". If the valve is normally closed, the
OPENING of the valve is achieved via the closing of the relay. If the valve is
normally open, the OPENING of the valve is achieved by the opening of the
relay.
Parameter: "Reaction on supply voltage failure"
On failure of the supply voltage, the Room Controller has no function. The
output can be set to a defined state with this parameter.
This parameter is only visible for the Switch Actuator Module SA/M 2.6.1.
The Electronic Switch Actuator Modules ES/M 2.xx.1 always switch off on
failure of the supply voltage (high-resistance).
Parameter: "Control telegram is received as"
The heating actuator can either be controlled via the 1-bit object "Switch" or
the 1-byte object "Control value (PWM)".
In 1-bit control, the heating actuator functions in a similar way to a standard
switch actuator: The room thermostat controls the heating actuator via
standard switching commands. A 2-step control or pulse width modulation of
the control value can be implemented in this way.
For 1-byte control, a value of 0..255 (corresponds to 0%..100%) is preset by
the room thermostat. This process is also known as "continuous-action
control". The valve is closed at 0% and fully opened at 100%. The heating
actuator controls intermediate values via pulse width modulation (see
diagram above).
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