Safety clamp
If the galvanic isolation (PELV) between
control terminals and high-voltage termi-
nals is to be maintained, the accompany-
ing safety clamp must be fitted to VLT
2803-2815, 200-240 V, and VLT
2805-2815, 380-480 V.
Pre-fuses
For all unit types, external pre-fuses must be fitted in
the mains supply to the frequency converter. For UL/
cUL applications with a mains voltage of 200-240 Volt,
use pre-fuses type Bussmann KTN-R (200-240 Volt)
or Ferraz Shawmut type ATMR (max. 30A). For UL/
cUL applications with a mains voltage of 380-480 Volt,
use pre-fuses type Bussmann KTS-R (380-480 Volt).
See
Technical data
for correct dimensioning of pre-
fuses.
Mains connection
Please note that at 1 x 220-240 Volt the neutral wire
must be attached to terminal N
(L2)
and the phase wire
must be connected to terminal L1
(L1)
.
No. N
(L2)
L1
(L1)
(L3)
Mains voltage 1 x 220-240 V
N
L1
No.
95
Earth connection
No. N
(L2)
L1
(L1)
(L3)
Mains voltage 3 x 220-240 V
L2
L1
L3
No.
95
Earth connection
No. 91 92
93 Mains voltage 3 x 380-480 V
L1 L2
L3
No. 95
Earth connection
NB!
Please check that the mains voltage fits
the mains voltage of the frequency con-
verter, which can be seen from the name-
plate.
400-Volt units with RFI-filters may not be
connected to mains supplies in which the
voltage between phase and earth is more
than 300 Volts. Please note that for the IT
mains and the delta earth the mains volt-
age can exceed 300 Volts between phase
and earth. Units with type code R5 can be
connected to mains supplies with up to
400 V between phase and earth.
See
Technical data
for correct dimensioning of cable
cross-section. See also the section entitled
Galvanic
isolation
for further details.
Motor connection
Connect the motor to terminals 96, 97, 98. Connect
earth to terminal 99.
No. 96 97
98
Motor voltage 0-100% of mains
voltage.
U
V
W
3 wires of motor
U1
W2
V1
U2
W1
V2
6 wires out of motor, Delta con-
nected
U1 V1 W1 6 wires out of motor, Star con-
nected
U2, V2, W2 to be interconnec-
ted separely (optional terminal
block)
No. PE
Earth connection
See
Technical data
for correct dimensioning of cable
cross-section.
All types of three-phase asynchronous standard mo-
tors can be connected to a frequency converter. Nor-
mally, small motors are star-connected (230/400 V,
∆
/ Y). Large motors are delta-connected (400/690 V,
∆
/ Y). The correct connection mode and voltage can
be read from the motor nameplate.
NB!
In motors without phase insulation paper,
an LC filter should be fitted on the output
of the frequency converter.
MG.27.E2.02 - VLT is a registered Danfoss trademark
49
In
s
ta
lla
ti
on
