ABB i-bus KNX Product Manual page 72

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ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Commissioning
This step time is used if the actual value still varies greatly from the setpoint.
Otherwise the step time for slow approach is used.
For further information see:
Note
The step time may not be selected to be less than the delay of the control
circuit. This is comprised of the detection speed of the Light Sensor and
the dynamic response of the luminaries. If the step time is less than the
delay of the control circuit, the Light Controller will set the brightness
beyond the target value and oscillation will occur in the lighting control.
In this case the change in brightness due to a control step will only be
achieved after sending the next control step.
Step time for slow approach
Options: 1/2...4*...9/10 s
* Default value if control parameterised as a master
This parameter defines the step time of a control step when approaching
the actual value. The larger the step time, the longer until the brightness of
the control step is set. The Light Control slowly approaches the setpoint.
This step time is used when the actual value is relatively near to the setpoint.
Otherwise the step time for fast approach is used.
For further information see:
Control deviation for medium dimming speed
Options: 10...20...50
This value represents the control divergence (difference between the
setpoint and actual value) at which there is a change between fast and slow
approach to the setpoint. Above this control divergence there is a fast
approach (small increments of the control step), below it there is slow
approach with a large step time.
At the same time the response of the lighting control is slower with larger
values, whereby they do not respond too sensitively to brightness changes
caused by clouds or temporary changes, e.g. persons in the detection area
of the Light Sensor in the room.
For further information see:
Maximum brightness change
Options: 1...5*...10
* Default value if control parameterised as a master
This value defines the maximum increment size of a control step. This is the
maximum brightness difference that the Light Controller can perform per
control step. In this way the Light Controller can approach the setpoint value
in large steps. There is a danger however than the setpoint is exceeded and
the light control circuit will be unstable.
For further information see:
Control deviation for high increments (max. control step)
Options: 10...30...255
This value represents the control divergence (difference between the
setpoint and actual value) up to which the maximum increment can be
controlled.
Constant lighting control
Constant lighting control
Constant lighting control
Constant lighting control
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