Art. No. ..5192KRMTSD
Art. No. ..5194KRMTSD
Table 11: Value meaning for 1 byte fan level object
Due to fan motors' inertia, as a rule there is a limit to how short the time intervals for switching
the fan levels can be, i.e. there is a limit to how quickly the fan speed can be varied. Often the
technical information for a fan coil unit specifies change-over times that the fan controller must
maintain for each fan level change-over. The change-over direction, i.e. whether the level is
being increased or decreased, does not play any role here.
With a change-over via the 1-bit objects, when the fan level is changed by the controller, the
active fan level is first switched off before the new level is switched on. If the fan controller is
working in automatic mode, the settable "Waiting time on level change-over" is maintained on
change-over of the levels. For this short time, the fan level objects all receive the status "0 - Fan
off". A new level is only then switched on when the waiting time has elapsed. Only one fan level
output is ever switched on (changeover principle).
With change-over via the 1-byte object, on changing the fan level, the change-over takes place
directly into the new level, without setting the "OFF" status. If the fan controller is working in
automatic mode, the settable "Waiting time on level change-over" (dwell time) is always taken
into account before change-over of the levels. With rapid level change-over, the change to the
new level only takes place once the waiting time has elapsed.
i
The change from level 1 to OFF always takes place immediately, without a waiting time. An
optionally-configured switch-on level is applied directly.
i
In manual mode, the "Waiting time on level change-over" is only significant for the switch-
on level (Start-up via level). Here, the fan levels can be switched over without a delay
through manual operation.
i
When changing from manual operation to automatic operation, the waiting time is taken
into account in the case of a connected level change.
The fan level active in the current controller operating state is shown with using the fan icon in
the display of the device. In both automatic and manual operation (for a function description,
please see the section "Automatic operation / manual operation"), the display takes place via
arc segments in the fan icon in the following manner:
Ŝ
Fan OFF
ŝ
Fan level 1 active
Ş
Fan level 2 active
...
ş
Fan level 8 active
With up to 8 fan levels each individual fan level is identified in the fan icon by an individual arc
segment. The arc is closed when all 8 fan levels are switched on.
If the number of fan levels is reduced in the ETS (e.g. "3"), adjacent arc segments are joined
into groups, so that, when the largest fan level ("3" -
ş
) is activated, all of the arc segments of
the fan icon are illuminated. For smaller fan levels, fewer group segments are illuminated in like
manner
Optionally, the active fan level can be indicated via all 8 status LEDs by means of the temporary
fan level display. Temporary fan level display takes place in manual mode only.
Page 147 of 309
Software "Room controller display compact module 146x11"
Functional description
