Danfoss VLT Automation Drive FC 300 Operating Instructions Manual page 49

®
VLT Automation Drive FC 300
Operating Instructions High Power
Make the screen connections with the largest possible surface area (cable clamp). This is done by
using the supplied installation devices in the frequency converter.
Cable-length and cross-section:
The frequency converter has been tested with a given length of cable and a given cross-section
of that cable. If the cross-section is increased, the cable capacitance - and thus the leakage current
- may increase, and the cable length must be reduced correspondingly. Keep the motor cable as
short as possible to reduce the noise level and leakage currents.
Details can be found in the relevant Design Guide.
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 Par. 14-01.
Term.
no.
1) Protected Earth Connection
Illustration 3.70: Compact IP 00 (Chassis), enclo-
sure D3
96 97 98 99
U V W 1)
PE
U1 V1 W1
PE 1)
W2 U2 V2
U1 V1 W1 1)
PE
MG.33.U1.02 - VLT ® is a registered Danfoss trademark
Motor voltage 0-100% of mains voltage.
3 wires out of motor
Delta-connected
6 wires out of motor
Star-connected U2, V2, W2
U2, V2 and W2 to be interconnected separately.
NB!
In motors without phase insula-
tion paper or other insulation re-
inforcement suitable for opera-
tion with voltage supply (such
as a frequency converter), fit a
Sine-wave filter on the output of
the frequency converter.
Illustration 3.71: Compact IP 21 (NEMA 1) and IP
54 (NEMA 12), enclosure D1
3. How to Install
3
49