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Art. No. SC 1000 KNX
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The parameter "Level limit" is not checked for plausibility in the ETS, meaning that an
implausible parameterisation is possible. For this reason, care should be taken to ensure
that there is no limit level in the configuration which is higher than the actual fan levels. If a
higher limit level is configured, then the limit has no effect.
Forced fan position
The controller provides the option of activating a forced fan position via the bus. With an active
forced position, the fan levels can neither be controlled nor switched over in either automatic or
manual mode. The fan remains in the forced state until the forced position is removed using the
bus. In this manner, it is possible to switch the fan to a locked and controlled state, for example
for servicing purposes.
As soon as a "1" telegram is received via the 1-bit object "Ventilation, forced position", the
controller immediately sets the fan level configured in the ETS without delay. The fan can also
be completely switched off. The only special feature when activating the forced position is the
fact that the fan controller is in automatic operation and a waiting time elapses, due to a
previous level change-over. In this case, the fan controller only switches to the forced position
level without the waiting time elapsing.
The forced position is dominant. For this reason, if connect be overdriven from automatic mode,
manual mode, the level limit or fan protection. Only when the forced position is removed does
the fan control begin to control the fan levels according to the active operating mode.
The removal takes place when a "0" telegram is received via the
object "Ventilation, forced position". The fan always switches itself off first. In automatic
operation, the controller then evaluates the active command value and, when the waiting time
configured in the ETS has elapsed, switches to the required fan level, taking an optionally-
configured switch-on level into account. In manual operation, the fan first remains switched off.
The fan level is only raised when the manual control button is pressed again. If a switch-on level
is configured, the controller will, when a button is pressed, switch to the switch-on level and
remain there until further operation occurs.
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The parameter "Behaviour with forced position" is not checked for plausibility in the ETS,
meaning that an implausible parameterisation is possible. For this reason, care should be
taken to ensure that there is no fan level in the configuration which is higher than the actual
fan levels. If a higher level is configured for behaviour in a forced position than the number
of fan levels, then the fan controller with start up the maximum possible level when the
forced position is activated.
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The forced fan position does not influence the control algorithm integrated in the controller.
The command values of the PI feedback control continue to be transmitted to the bus, even
with a forced fan.
Command value limiting values and command value offset
In automatic operation, the command value of the controller is used internally in the device to
control the fan levels, according to the fan operating mode. As a transition between the levels,
there are threshold values, defined according to the command value of the controller, which can
be set using parameters in the ETS. The evaluation of the controller command values can be
specially influenced for automatic fan control.
The command value to be evaluated for the fan controller can be influenced by the "Command
value is 0% until internal command value is greater than" parameter in the lower command
value range. The fan controller only evaluates the command value according to the configured
threshold values when the internal command value of the controller exceeds the configured
limiting value. With smaller command values, the fan remains at a standstill.
Similarly, the command value to be evaluated for the fan controller can be limited by the
"Command value is 100% as soon as internal command value is greater than" parameter in the
upper command value range. In this case, the controller evaluates command values which
exceed the configured limiting value as 100%. This means that the fan works at full power even
with command values not at the maximum.
The "Command value offset" parameter allows configuration of a constant command value
Page 218 of 347
Software "Smart Control 501511"
Functional description