Capacity Distribution; Step Regulation; Speed Regulation - Danfoss ADAP-KOOL AK-PC 783 Design Manual

Capacity distribution

Step regulation

Cut-ins and cutouts are carried out sequentially. The last cut-in
unit will be cut out first.

Speed regulation

When an analog output is used the fans can be speed regulated,
e.g. with a frequency converter type VLT or a EC motor.
Joint speed regulation
The analog output voltage is connected to the speed regulation.
All fans will now be regulated from 0 to max. capacity. If an ON/
OFF signal is required for the frequency converter, so that the fans
can be stopped completely, a relay output can be defined.
Start
Min.
The controller starts the frequency converter when the capacity
requirement corresponds to the set starting speed. The controller
stops the frequency converter when the capacity requirement
becomes lower than the set minimum speed.
112 Capacity controller RS8GN202 © Danfoss 11-2013
Speed regulation + step regulation
Start
Min.
The controller starts the frequency converter and the first fan
when the capacity requirement corresponds to the set starting
speed.
The controller cuts in several fans step by step as the capacity
requirement grows and then adapts the speed to the new
situation.
The controller cuts out fans when the capacity requirement
becomes lower than the set minimum speed.
In the configuration of the controller's outputs it will be the output "FanA1"" that will start and
stop the frequency converter.
Speed regulation of first fan + step regulation of the rest
The controller starts the frequency converter and increases the
speed of the first fan.
If additional capacity is required, the next fan cuts in at the same
time as the first fan switches to minimum speed. From here, the
first fan can increase speed again, etc.
AK-PC 783