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The Textile Magazine
JUNE 2012
dramatically.
Using a ducted back-channel, air is allowed to pass
over the unit’s heat sink with minimal air passing
through the electronics area. This way 90 per cent of
the heat generated by the drive is exhausted directly
outside of the enclosure, improving reliability and pro-
longing the lifetime of the unit. An IP54 seal between
the back channel cooling duct and the electronics area
of the VLT drive helps to significantly reduce tempera-
ture rise and contamination of the electronic compo-
nents.
w
Danfoss’
new D-frame VLT drives
are really energy-efficient
new products
Up to 67 per cent smaller than their predecessors, the
new Danfoss D-Frame drives are optimised for high
performance, reliability and compact dimensions in
the 90-315 kW power range. In addition to the VLT’s
energy efficiency, the drive helps to reduce initial panel
and switch-room cooling costs with the innovative
back-channel cooling concept.
With the increasing demands of improved efficiency
and reliability in drive technology, OEMs, panel build-
ers and end users are looking for new technologies that
can save energy, reduce costs and complexity in a solu-
tion that will provide trouble-free operation for years.
The new D-Frame VLT drives are not only among
the smallest in their class, they also include an array
of efficiency and safety enhancing options as stand-
ard features, enabling customers and end users to
reduce both initial and ongoing operating costs.
90-315kW with cost reducing
features
Available in a power range from 90-315kW,
the new units are factory-fitted with optional
semi-conductor fuses. Additional options will
also be available, including basic input options
such as mains disconnect, contactor and circuit
breaker, eliminating the need to install basic
options externally.
For robust protection all drives come stand-
ard with coated printed circuit boards which,
together with the optional heat sink access
panel, help to extend drive lifetime and relia-
bility. The new drives are available with IP20,
IP21 or IP 54 enclosure protection ratings.
The new D-Frame drives use Danfoss’
unique and innovative back-channel cooling
concept to keep electronics safely within op-
timal operation temperatures. The big advan-
tage of back-channel cooling is that system
installation and operating costs can be reduced