VLT® 2800 Series
■ General information about electrical installation
■ High voltage warning
The voltage of the adjustable frequency
drive is dangerous whenever the drive
is connected to the AC line. Incorrect
installation of the motor or drive may cause damage
to the equipment, serious injury or death. Comply
with the safety instructions in this manual as well
as local and national rules and safety regulations.
Touching electrical parts may be fatal - even after the
equipment has been disconnected from the AC line.
Wait at least 4 minutes for current to dissipate.
NOTE
It is the responsibility of the user or installer
to ensure correct grounding and protection in
accordance with national and local standards.
■ Grounding
Comply with the following at installation:
• Safety grounding: The drive has a high leakage
current and must be grounded properly for safety.
Follow all local safety regulations.
• High frequency grounding: Keep grounding
cables as short as possible.
Connect all grounds to ensure the lowest possible
conductor impedance. The lowest possible conductor
impedance is achieved by keeping the conductor as
short as possible and by grounding with the greatest
possible surface area. If multiple drives are installed
in a cabinet, the cabinet backplate, which must be
made of metal, should be used as a joint ground
referenceplate. Thedrivesmustbefittedtothe
backplate at the lowest possible impedance.
To achieve low impedance, connect the drive to the
backplate with the drive fastening bolts. Remove
all paint from the contact points.
■ High voltage test
A high voltage test can be performed by short-circuiting
terminalsU,V,W,L1,L2andL3,andapplying
max. 2160 V DC in 1 sec. between this
short-circuit and terminal 95.
MG.28.A8.22 - VLT is a registered Danfoss trademark
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