Electrical Installation; Power Connections - Danfoss VLT AQUA Drive FC 200 Operating Instructions Manual

How to Install

4.6 Electrical Installation

4.6.1 Power Connections

Cabling and Fusing
NOTE
Cables General
All cabling must comply with national and local
regulations on cable cross-sections and ambient
temperature. UL applications require 75° C copper
conductors. 75 and 90° C copper conductors are thermally
acceptable for the frequency converter to use in non UL
applications.
The power cable connections are situated as shown below.
Dimensioning of cable cross section must be done in
accordance with the current ratings and local legislation.
See 8 General Specifications for details.
For protection of the frequency converter, the
recommended fuses must be used or the unit must be
with built-in fuses. Recommended fuses can be seen in the
tables of the fuse section. Always ensure that proper fusing
is made according to local regulation.
The mains connection is fitted to the mains switch if this is
included.
3 Phase
power
input
Term. no. 96 97
U V
U1 V1
W2 U2
U1 V1
1)
Protected Earth Connection
NOTE
In motors without phase insulation paper or other
insulation reinforcement suitable for operation with
voltage supply (such as a frequency converter), fit a Sine-
wave filter on the output of the frequency converter.
VLT AQUA Low Harmonic Drive Operating Instructions
91 (L1)
92 (L2)
93 (L3)
95 PE
98 99
W 1) Motor voltage 0-100% of mains voltage.
PE
3 wires out of motor
W1 Delta-connected
1)
PE
V2 6 wires out of motor
W1 1) Star-connected U2, V2, W2
PE
U2, V2 and W2 to be interconnected separately.
®
MG20T202 - VLT is a registered Danfoss trademark
NOTE
To comply with EMC emission specifications, screened/
armoured cables are recommended. If an unscreened/
unarmoured cable is used, see 4.6.13 Power and Control
Wiring for Unscreened Cables.
See 8 General Specifications for correct dimensioning of
motor cable cross-section and length.
Screening of cables:
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies. If it is
necessary to break the screen to install a motor isolator or
motor contactor, the screen must be continued at the
lowest possible HF impedance.
Connect the motor cable screen to both the de-coupling
plate of the frequency converter and to the metal housing
of the motor.
Make the screen connections with the largest possible
surface area (cable clamp). This is done by using the
supplied installation devices within the frequency
converter.
Cable-length and cross-section:
The frequency converter has been EMC tested with a given
length of cable. Keep the motor cable as short as possible
to reduce the noise level and leakage currents.
Switching frequency:
When frequency converters are used together with Sine-
wave filters to reduce the acoustic noise from a motor, the
switching frequency must be set according to the
instruction in 14-01 Switching Frequency.
4 4
35