VLT
®
6000 HVAC Series
Introduction to
HVAC
■
Example of application - Speed control of
fan in ventilation system
The AHU installation is able to distribute air throughout
the building or to one or several parts of a building.
Normally, an AHU installation consists of a fan and
a motor that supply air, a fan scroll and a duct
system with filters. If centralised air distribution is
applied, the efficiency of the installation will increase
and major energy savings can be made.
A VLT 6000 HVAC enables excellent control and
monitoring, thereby ensuring perfect conditions
in the building at all times.
This example shows an application with
Run permissive
,
warning against no load and warning for filter change.
The
Run permissive
function ensures that the frequency
converter will not start the motor until the discharge
damper has opened. If the V-belt to the fan breaks
and if the filter is to be changed, this application
will also give a warning on an output.
Set the following parameters:
Par. 100
Configuration
Open loop [0]
Par. 221
Warning: Low current, I
LOW
Depends on unit
Par. 224
Warning: High frequency, f
HIGH
Par. 300
Terminal 16 Digital inputs
Run permissive [8]
Par. 302
Terminal 18 Digital inputs
Start [1]
Par. 308
Terminal 53, analogue input voltage
Reference [1]
Par. 309
Terminal 53, min. scaling
0 v
Par. 310
Terminal 53, max. scaling
10 v
Par. 319
Output
Output frequency greater than f
HIGH
par. 224
Par. 323
Relay 1
Start command active [27]
Par. 326
Relay 2
Alarm or warning [12]
Par. 409
Function at no load
Warning [1]
MG.61.A5.02 - VLT is a registered Danfoss trademark
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