Operating instructions

Supporting software tool
Software tools are available to help
design a system with minimal
harmonics and best energy effi ciency.
Protection mode
As soon as the system detects a critical
status (e.g. over-current or over-
voltage) the frequency of the VLT®
HVAC Drive will automatically be
reduced and the modulation process
adjusted.
Due to its ability to limit its switching
operations the VLT® HVAC Drive is
extremely reliable and robust.
The protection mode will – if
allowable – end after 10 seconds and
the frequency will be restored under
control.
Minimum 98% effi ciency
The VLT® HVAC Drive sets new
standards with a minimum 98%
effi ciency at full load. This reduces
initial costs and operating costs due to
the smaller heat load/air conditioning
requirement in the switchroom/
plantroom, thereby maximizing
energy effi ciency. Every kW of losses
requires another ~0.5 kW of energy to
remove the heat.
Installed in an air conditioned switch-
room, lower losses can easily result in
operating cost savings >5% – 10% of
the cost of the drive every year (based
on a typical load profi le, with the drive
operating 24/7). Also energy
consumption and CO
2
emission is
reduced.
High Ambient
Temperatures
VLT® HVAC Drive is designed to
operate in ambient temperatures
up to 50
o
C with an autoderate
capability for higher temperatures in
order to maintain reduced operation
in extreme climate conditions.
In most cases, the VLT® HVAC Drive
will handle abnormal situations
without needing attention.
VLT® HVAC Drive will manage the loss
of a mains phase or a high mains
imbalance by autoderating speed and
load to maintain a period of reduced
operation, enabling technicians to
respond to the situation.
NEW!
The Danfoss EC+ concept...
... enables the use of PM motors in
IEC-standard sizes with Danfoss
VLT® frequency converters.
After entering the relevant motor
data, you benefi t from the high
engine effi ciency at EC technology
level in all applications.
Necessary control method has
been embedded in dedicated
VLT® series drives.
Benefi ts of the EC + concept:
■ Free choice of motor tech-
nology: PM or asynchronous
with same frequency converter
■ Operation and installation of
the VLT® drive remain the same
■ Vendor-independent election
of all components
■ Best system effi ciency by
combining effi ciency-optimized
components
■ Retrofi t of existing plant
■ Support a broad range of
standard and PM motors
GOAL
effi ciency
Our goal is the highest effi ciency
with the lowest energy consump-
tion and with the lowest overall
system cost for our customers
= “The Benefi t of Ownership”.
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