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
11
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