Technical data

VLT
®
2800 Series
■ General information about electrical installation
■ High voltage warning
The voltage of the frequency converter
is dangerous whenever the equipment is
connected to mains. Incorrect installation
of the motor or frequency converter may cause
damage to the equipment, serious injury or death.
Comply with the instructions in this manual, as well as
national and local rules and safety regulations.
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains:
Wait at least 4 minutes for current dissipate.
NB!:
It is the responsibility of the user or installer
to ensure correct earthing and protection in
accordance with national and local standards.
■ Earthing
Comply with the following at installation:
• Safety earthing: The drive has a high leakage
current and must be earthed properly for safety.
Follow all local safety regulations.
• High frequency earthing: Keep earthing
connections as short as possible.
Connect all earthing systems 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
earth reference plate. The drives must be fitted to the
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.
■ Extra protection
RCD relays, multiple protective earthing or earthing
can be used as extra protection, provided that local
safety regulations are complied with. In the case of an
earth fault, a DC content may develop in the faulty
current. Never use an RCD (ELCB relay), type A, as
it is not suitable for DC faulty currents. If RCD relays
are used, local regulations must be complied with.
If RCD relays are used, they must be:
- Suitable for protecting equipment with a DC content
in the faulty current (3-phase bridge rectifier).
- Suitable for a pulse-shaped, brief discharge
on power-up.
- Suitable for a high leakage current.
N must be connected before L1 for single phase 200
V reduced leakage current units (type code R4).
■ High voltage test
A high voltage test can be performed by
short-circuitingterminalsU,V,W,L1,L2andL3,
and applying max. 2160 V DC in 1 sec. between
this short-circuit and terminal 95.
MG.28.A9.02 - VLT is a registered Danfoss trademark
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