Regin REGIO ARDO, Manual, Page: 37 / 134

Control functions
Figure 2-32 An example of fan boost control behaviour for an EC fan in auto mode, which provides a perceived
cooling effect until the cooling distribution from the cooling valve establishes. The P-band for the fan boost controller
has a lower value (higher gain) than the P-band for the temperature controller.
2.5.4 Fan kick-start
Fan kick-start is a control function that can be used to ensure that the EC fan starts even when the controller
outputs a low-voltage control signal.
When using today’s energy-saving EC fans, there is always a risk that the fan does not start due to a too low
control voltage that prevents the fan from exceeding its starting torque. The fan then remains at a standstill
while power still flows through it, which may cause damage to the fan. The fan kick-start function ensures
that the fan output is at its maximum for a set period of time, thereby making sure that the starting torque is
exceeded.
The fan kick-start function is enabled by configuring the Fan kick-start time setting to a value that is greater
than zero.
The fan kick-start function is activated when the fan starts from standstill, in manual or auto mode.
When the fan kick-start function is active, the controller sets the fan speed output signal to its maximum for
the period of time specified by the
Fan kick-start time configuration setting.
After the fan kick-start time has expired, the controller reverts to normal fan control, that is, auto or manual
mode.
The fan kick-start configuration settings are described in Table 2-20 .
100%
0%
Time (sec)
80%
60%
40%
20%
Fan speed signal
Fan output (0-10 V)
60 0 180 240 300
Temperature control signal
P band = 10 °C
I time = 300 sec
At T sec, the open
cooling valve starts
to reduce the error.
120 10 90 T
At 0 sec, presence is detected,
or the occupancy button in the
room unit is pressed and the
controller changes to bypass
state. The fan speed signal is
set to its maximum for 10 sec.
After the fan boost time has expired, the fan
speed signal correponds to the temperature
control signal, regardless if the fan boost
control signal is greater than the
temperature control signal.
At 300 sec, the
error is reduced
to zero.
After 10 sec, the fan speed
signal correponds to
whichever of the fan boost
or temperature control
signal that has the greatest
value.
Fan boost control signal
P band = 5 °C
Regio Ardo manual, Rev. D 37