Operating instructions

3.24 Main Menu - Analog I/O Option
MCB 109 - Group 26
The Analog I/O Option MCB 109 extends the functionality of
VLT HVAC Drive frequency converters, by adding a number of
additional, programmable analog inputs and outputs. This
could be especially useful in Building Management System
installations where the frequency converter may be used as
de-central I/O, obviating the need for an outstation and thus
reducing cost.
Consider the diagram:
This shows a typical Air Handling Unit (AHU). As can be seen,
the addition of the Analog I/O option offers the possibility to
control all of the functions from the frequency converter, such
as inlet-, return- and exhaust dampers or heating/cooling coils
with temperature and pressure measurements being read by
the frequency converter.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 177
3
3