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10
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
2.3 Mechanical installation
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VLT 3575-3700 and 3542-3562 HVAC
VLT 3575-3700, 380/500 V and VLT 3542-3562, 230 V,
are supplied with a mounting bracket placed at the back
of the converter. The mounting bracket also serves as an
air duct for the heat sinks; the bracket must be mounted
on the frequency converter before operation. The
bracket does not need to be removed for installation
purposes. However, it is possible to remove it
temporarily by loosening the coupling bolts from the in-
side of the converter.
Remember to fasten the bracket again; otherwise there
will be a great risk of a trip because of overheating. The
4 drip-shaped holes in the mounting bracket make it
possible to fasten the attachment bolts to the wall or in
the panel before hanging the unit.
The attachment bolts are accessible through the top and
bottom of the bracket, since a need to adjust tension
may arise later on.
VLT 3575-3600 HVAC, 380/500 V and VLT 3542-3562
HVAC, 230V, are intended for wall installation only.
VLT 3625-3700 HVAC is supplied for wall installation as
standard, but can be mounted on a base.
VLT 3750-3800 is intended for floor installation only,
which is why the base is supplied as part of the fre-
quency converter.
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VLT 3500 HVAC can be installed with the flanges side by
side.
Drawing shows frequency converter seen from above.
Base VLT
3625-3800 HVAC
As an option to VLT 3625-3700 a base for floor instal-
lation can be supplied (ordering no.175L3047). VLT
3750-3800 is intended for floor installation only, which
is why the base is supplied as part of the frequency
converter. The base must be fastened to the floor by
means of 4 bolts before installing the frequency con-
verter. Unscrew the front plate of the base to fasten
the converter through the 4 top holes in the base.
See also the section on cooling.
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The enclosure of the frequency converter is
made of steel. To avoid getting metal chips
in the electronics, the drilling of holes for cables is
only to be carried out after the unit has been installed
in a vertical position.
Warning
VLT 3500 HVAC must always be
attached firmly to the wall or the floor
before further installation work is carried out, so as to
ensure that no injury or damage occurs. This rule
must be complied with, especially with regard to the
types of frequency converters that are top heavy.
EMC-correct installation
With respect to mechanical installation, reference is
also made to chapter 2.6 on EMC-correct installation.
General aspects
VLT 3500 HVAC is cooled by means of air circulation.
Consequently, the air needs to be able to move freely
above and below the frequency converter.
VLT 3502-3562 HVAC
This series must be installed on a plane surface to
ensure that the air flow is in contact with the heat sink
all the way from the bottom of the converter. VLT
3500 HVAC has mounting holes in the side flanges.
This means that two units can be installed flange to
flange. Frequency converters without side flanges but
with mounting holes at top and bottom (IP 20) can be
installed without any free space on the sides.
Mechanical installation
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