MG.60.C4.02 – VLT is a registered Danfoss trademark
5
VLT
®
6000 HVAC
■
■
■
■
■
High voltage warning
The voltage of the frequency converter
is dangerous whenever the
equipment is connected to mains.
Incorrect installation of the motor or the
frequency converter may cause damage to
the equipment, serious personal injury or
death.
Consequently, the instructions in this Design
Guide, as well as national and local safety
regulations, must be complied with.
Touching the electrical parts may be fatal -
even after disconnection from mains:
Using VLT 6002-6005 wait at least 4 minutes
and using VLT 6006-6550 wait at least 15
minutes.
NB!
It is the user's or certified electrician's
responsibility to ensure correct earthing
and protection in accordance with
applicable national and local norms and
standards.
■
■
■
■
■
Earthing
The following basic issues need to be
considered when installing a frequency
converter, so as to obtain electromagnetic
compatibility (EMC).
•
•
•
•
•
Safety earthing:
Safety earthing:
Safety earthing:
Safety earthing:
Safety earthing: Please note that the
frequency converter has a high leakage
current and must be earthed
appropriately for safety reasons. Apply
local safety regulations.
•
High-fr
High-fr
High-fr
High-fr
High-frequency earthing:
equency earthing:
equency earthing:
equency earthing:
equency earthing: Keep the
earth wire connections as short as
possible.
Connect the different earth systems at the
lowest possible conductor impedance. The
lowest possible conductor impedance is
obtained by keeping the conductor as short as
possible and by using the greatest possible
surface area. A flat conductor, for example,
has a lower HF impedance than a round
conductor for the same conductor cross-
section C
VESS
.
If more than one device is installed in
cabinets, the cabinet rear plate, which must
be made of metal, should be used as a
common earth reference plate. The metal
cabinets of the different devices are mounted
on the cabinet rear plate using the lowest
possible HF impedance. This avoids having
different HF voltages for the individual devices
and avoids the risk of radio interference
currents running in connection cables that
may be used between the devices. The radio
interference will have been reduced.
In order to obtain a low HF impedance, use
the fastening bolts of the devices as HF
connection to the rear plate. It is necessary to
remove insulating paint or similar from the
fastening points.
■
Cables
Control cables and the filtered mains cable
should be installed separate from the motor
cables so as to avoid interference
overcoupling. Normally, a distance of 20 cm
will be sufficient, but it is recommended to
keep the greatest possible distance wherever
possible, especially where cables are installed
in parallel over a substantial distance.
With respect to sensitive signal cables, such
as telephone cables and data cables, the
greatest possible distance is recommended
with a minimum of 1 m per 5 m of power
cable (mains and motor cable). It must be
pointed out that the necessary distance
depends on the sensitivity of the installation
and the signal cables, and that therefore no
precise values can be stated.
If cable jaws are used, sensitive signal cables
are not to be placed in the same cable jaws
as the motor cable or brake cable.
If signal cables are to cross power cables, this
should be done at an angle of 90 degrees.
Remember that all interference-filled in- or
outgoing cables to/from a cabinet should be
screened/armoured or filtered.
■
■
■
■
■
General information about electrical
installation
