Danfoss VLT AutomationDrive FC 302 Design Manual page 165

Electrical Installation Con...
Illustration 10.17–Illustration 10.20 show the typical rate of rise voltage and peak voltages at the motor terminals for both
shielded and unshielded cables in various configurations.
These values are true to steady state operation and at RMS input voltage range of the drive V
braking mode, the intermediate DC-link voltage increases by 20%. This effect is similar to increasing the mains voltage by
20%. Consider this voltage increase when performing motor insulation analysis for braking applications.
3.50
1
3.00
2.50
2
2.00
1.50
1.00
3
0.50
0
100
(328)
Motor cable length, m (ft)
1 Unshielded cable with no filter
2 Shielded cable with no filter
3 Unshielded cable with dU/dt filter
4 Shielded cable with dU/dt filter
Illustration 10.17 dU/dt at Motor Terminals for Enclosures E1h/
E3h, 380–500 V
MG38C202
Design Guide
4
200 300
(656) (984)
Danfoss A/S © 01/2018 All rights reserved.
line
1
3.00
2.50
2.00
2
1.50
1.00
0.50
0
100
(328)
Motor cable length, m (ft)
1 Unshielded cable with dU/dt filter
2 Shielded cable with dU/dt filter
3 Shielded cable with no filter
4 Unshielded cable with no filter
Illustration 10.18 Peak Voltages at Motor Terminals for
Enclosures E1h/E3h, 380–500 V
. When the drive operates in
3
4
200 300
(656) (984)
163
10 10