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 instal-
lation of the motor or drive may cause
damage to the equipment, serious injury
or death. Comply with the safety instruc-
tions 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 dis-
connected from the AC line. Wait at least
4 minutes for current to dissipate.
NOTE
It is the responsibility of the user or instal-
ler to ensure correct grounding and pro-
tection 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 con-
nections 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 con-
ductor 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 back-
plate 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-circuit-
ing terminals U, V, W, L1, L2 and L3, and applying a
max. of 2,160 V DC in 1 sec. between this short-circuit
and terminal 95.
Do not perform a high voltage test be-
tween the control terminals and the chas-
sis, because the voltage potential of the
control card cannot exceed approximately
100 volts with respect to chassis due to a
voltage limiting circuitry.
The terminals are protected against direct
hazardous access through barriers.
VLT
®
2800 Series
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark 11
Installation
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