MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
44
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How to install your VL
T
Prefuses
Prefuses must be installed in the supply feeding the
frequency converter.
The correct sizes and ratings can be found in the
Technical Data section.
What cables to use
Cables for the control signals and the brake cable
must be screened in order to comply with EMC
specifications.
The maximum cable length and the maximum cable
cross section is specified under Technical Data.
Any motor cable screening is connected to the
screen termination bracket in the frequency converter
(bottom) and the motor.
If non-screened cables are used, the control inputs
can occasionally be subject to signal disturbances.
Normally such a disturbance will not affect the
frequency converter.
For the North American market
CAUTION:
It is the responsibility of the user or person installing the
drive to provide proper grounding and branch circuit
protection for incoming power and motor overload
according to National Electrical Codes (NEC) and local
codes.
The Electronic Thermal Relay (ETR) in UL listed VLT's
provides class 20 motor overload protection in
accordance with NEC in single motor applications,
when parameter 315 is set to
Trip
[2] and parameter
107 is set to nominal motor (nameplate) current.
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Mechanical installation
The VLT 2000 Series is cooled by natural convection.
Therefore air must be able to pass freely under and
over the unit.
The frequency converter must be mounted on a flat
vertical surface. This will ensure that the air flow
follows the heat reduction.
To enable the frequency converter to get rid of the
cooling air, you must allow free air space both above
and below the frequency converter.
The ambient temperature must not exceed 40°C so
that the VLT frequency converter can dispose of its
power loss.
Enclosure
IP 20 *)
A
100 mm
*) The unit is for panel mounting. It should be placed
so that it is easily accessible according to Pr
EN 50178
Side by side mounting
The VLT frequency converters can be installed side by
side. There is no need for any space for convection
along the side of the enclosure.
High voltage test
You can perform a 2.5 kV DC test for 1 second after
short-circuiting terminals U, V, W, L
1
, L
2
and L
3
. Testing
is according to the unit’s chassis.
It is important to ensure that the filter capacitors have
been discharged after the test.
Extra protection
As extra protection, error voltage relays or neutral
grounding can be used. However, the installation
must comply with local health and safety standards.
A ground fault can introduce a direct current in the
discharge current.
Terminal 95 (earthscrew) intended for reinforced
earthing. Any RCD-relays used must comply with
local regulations.The relays must be suitable to
protect three-phase equipment with bridge rectifier
and short discharge on power-up.
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