Mains Connection; Pre-Fuses; Motor Connection; Direction Of Motor Rotation - Danfoss VLT FCD 311 Design Manual

Mains connection

No. 91 92 93 Mains voltage 3 x 380-480 V
L1 L2 L3
PE Earth connection
NB!:
Please check that the mains voltage fits
the mains voltage of the frequency converter,
which can be seen from the nameplate.
See Technical data for correct dimensioning of cable
cross-section.

Pre-fuses

See Technical data for correct dimensioning of pre-
fuses.

Motor connection

Connect the motor to terminals 96, 97, 98. Connect
earth to PE- terminal.
No. 96 97 98 Motor voltage 0-100% of
mains voltage
U V W 3 wires out of motor
U1 V1 W1 6 wires out of motor, Delta
W2 U2 V2 connected
U1 V1 W1 6 wires out of motor, Star con-
nected
U2, V2, W2 to be intercon-
nected separately (optional
terminal block)
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.
Normally, small motors are star-connected (230/400
1
V, / Y). Large motors are delta-connected (400/690
1
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.04.A1.02 - VLT is a registered Danfoss trade mark
®
VLT FCD Series

Direction of motor rotation

The factory setting is for clockwise rotation with the
frequency converter transformer output connected
as follows:
Terminal 96 connected to U-phase.
Terminal 97 connected to V-phase.
Terminal 98 connected to W-phase.
The direction of rotation can be changed by switch-
ing two phases on the motor terminals.

Parallel connection of motors

39