Danfoss VLT AQUA Drive FC 202 Design Manual page 179

Electrical Installation Con...
3.50
3.00
1
2.50
2.00
2
1.50
1.00
3
0.50
0
100
(328)
Motor cable length, m (ft)
1 Shielded cable with no filter
2 Unshielded cable with no filter
3 Unshielded cable with dU/dt filter
4 Shielded cable with dU/dt filter
Figure 10.19 Peak Voltages at Motor Terminals for Enclosures
E2h/E4h, 380–480 V
Test results for 525–690 V
NEMA does not provide dU/dt results for 690 V.
Power size [kW (hp)] Cable [m (ft)]
450–630 (450–650) 30 (98)
50 (164)
710–800 (750–950)
20 (65)
50 (164)
Table 10.35 IEC dU/dt Test Results for E1h–E4h with Unshielded Cables and No Output Filter, 525–690 V
Power size [kW (hp)] Cable [m (ft)]
450–630 (450–650)
48 (157)
150 (492)
710–800 (750–950)
48 (157)
150 (492)
Table 10.36 IEC dU/dt Test Results for E1h–E4h with Shielded Cables and No Output Filter, 525–690 V
Figure 10.21–Figure 10.24 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.
MG22B222
Design Guide
4
200 300
(656) (984)
Mains voltage [V]
690
690
5 (16) 690
690
690
Mains voltage [V]
5 (16) 690
690
690
5 (16) 690
690
690
Danfoss A/S © 01/2018 All rights reserved.
3.00
1
2.50
2.00
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
Figure 10.20 Peak Voltages at Motor Terminals for Enclosures
E2h/E4h, 380–480 V
Rise time [µs] Peak voltage [V]
0.37 1625
0.86 2030
0.25 1212
0.33 1525
0.82 2040
Rise time [µs] Peak voltage [V]
0.23 1450
0.38 1637
0.94 1762
0.26 1262
0.46 1625
0.94 1710
2
3
4
200 300
(656) (984)
dU/dt [V/µs]
3494
1895
3850
3712
1996
dU/dt [V/µs]
5217
3400
1502
3894
2826
1455
. When the drive operates in
line
177
10 10