3. How to Install
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.
3
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.
1)
Protected Earth Connection
Illustration 3.70: Compact IP 00 (Chassis), enclo-
sure D3
48
96
97
98
99
no.
U
V
W
PE
U1
V1
W1
PE
W2
U2
V2
U1
V1
W1
PE
MG.20.P1.02 - VLT
VLT AQUA High Power Operation Instructions
1)
Motor voltage 0-100% of mains voltage.
3 wires out of motor
Delta-connected
1)
6 wires out of motor
1)
Star-connected U2, V2, W2
U2, V2 and W2 to be interconnected separately.
Illustration 3.71: Compact IP 21 (NEMA 1) and IP
54 (NEMA 12), enclosure D1
®
is a registered Danfoss trademark
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.