Art. No. SC 1000 KNX
as "Fan run-on time, heating" or "Fan run-on time, cooling", providing that these run-on times
are configured in the ETS. If, during the run-on time, the manual control button is pressed again,
the controller will terminate the run-on time. The fan switches off briefly and then switches
immediately to level 1.
i The 1-bit object "Ventilation, auto/manual" only allows change-over between automatic and
manual operation. It is not possible to switch the fan levels on using the object. This
function is reserved solely for local control.
i When changing from manual operation to automatic operation, the waiting time configured
in the ETS is taken into account in the case of a connected level change.
i The parameter "Fan level on change-over to manual" 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 level in the configuration which is higher than the
actual fan levels. If a level which does not exist is to be configured for the change-over to
manual control, then the fan controller changes over to the maximum possible level when
changing over to manual operation.
i In manual operation, the switch-on level only functions in certain situations (see next
section "Switch-on level").
Switch-on level
The fan can, if it was switched off before and should now start up, be switched on at a defined
switch-on level. This switch-on level can be any of the available fan levels, and is set in the ETS
using the "Start-up via level" parameter. The switch-on level is generally one of the higher fan
levels of a fan coil unit, so that at the beginning of a heating or cooling process the fan can start
up correctly (reliable start-up of the fan motor through transfer of a higher torque, and thus a
higher fan speed).
The switch-on level remains active for the "Waiting time on level change-over" configured in the
ETS. In automatic operation, the controller only switches to the fan level specified by the
command value, when the waiting time has elapsed. There is no change-over if, after the
waiting time has elapsed, the fan level specified by the command value equals the switch-on
level.
i If the controlled fan requires a longer period of time for the start-up, then the waiting time in
the ETS should be configured to higher values (possible time range 100 ms ... 25.5 s). It
should be noted that the waiting time is also taken into account on each level change-over
in automatic operation!
The switch-on level is always taken into account by the fan controller in automatic mode on
switching the fan on (if it was previously switched off by the command value evaluation) and, in
certain situations, after activation of manual operation. On changing over to manual operation,
the behaviour of the fan depends on the settings of the parameter "Fan level on changing over
to manual" and "Start-up via level" and the previous fan level in automatic operation as follows...
- If, due to the "Fan level on change-over to manual" parameter, a defined level from level 1
to level 8 is requested, the controller will set this level on activating manual operation. In
this case, the parameter "Start-up via level" is not taken into account if the fan was most
recently switched off in automatic operation.
Page 216 of 347
Software "Smart Control 501511"
Functional description
To Next Page
Loading...
Need help?
General
