Fan Operation - Danfoss Optyma Plus User Manual

Fan operation

The controller will control the fan so that the condensing
temperature is maintained at the desired value above the outdoor
temperature.
The user may select from different ways to control the fan:
• Internal speed regulation
Here the fan is speed-controlled via terminal 5-6.
At a need of 95% and above, the relay on terminal 15-16 are
activated, while 5-6 are deactivated.
• External speed regulation
For larger fan motors with insufficient internal outlet, an external
speed regulation can be connected to terminal 54-55. A 0-10 V
signal indicating the desired speed is then sent from this point.
The relay on terminal 15-16 will be active when the fan is in
operation.
In menu 'F17' the user can define which of the two controls to use.
Fan speed at start
When the fan is re-started after an idle period, it will be started
at a speed that is set in the 'Jog Speed' function. This speed is
maintained for 10 seconds, after which the speed changes to the
regulation need.
Fan speed at low loads
At low loads between 10 and 30%, the speed will remain at that
which is set in the 'FanMinSpeed' function.
Fan speed at low ambient temperatures
To avoid frequent start/stops in low ambient temperatures in
which the fan's capacity is high, the internal amplification factor is
lowered. This provides a smoother regulation.
The 'Jog speed' is also lowered in the area from 10°C and down to
-20°C.
At temperatures below -20°C the 'Jog Low' value can be used.
Optyma Plus
TM
User Guide RS8GD602 © Danfoss 2015-10
Speed
Jog
Min.
Speed
Jog
Jog low
Required
capacity
3