Danfoss VLT AutomationDrive FC 302 Design Manual page 166

Electrical Installation Con...
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0
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
Illustration 10.19 Peak Voltages at Motor Terminals for
Enclosures E2h/E4h, 380–500 V
10 10
Test results for 525–690 V
NEMA does not provide dU/dt results for 690 V.
Power size [kW (hp)]
355–560 (400–600)
630–710 (650–750)
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)]
355–560 (400–600)
630–710 (650–750)
Table 10.36 IEC dU/dt Test Results for E1h–E4h with Shielded Cables and No Output Filter, 525–690 V
Illustration 10.21–Illustration 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.
164
VLT® AutomationDrive FC 302
1
2
3
4
100 200
(328) (656)
Motor cable length, m (ft)
Cable [m (ft)] Mains voltage [V]
30 (98)
50 (164)
5 (16)
20 (65)
50 (164)
Cable [m (ft)] Mains voltage [V]
5 (16)
48 (157)
150 (492)
5 (16)
48 (157)
150 (492)
Danfoss A/S © 01/2018 All rights reserved.
3.00
2.50
2.00
1.50
1.00
0.50
0
300
(984)
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 10.20 Peak Voltages at Motor Terminals for
Enclosures E2h/E4h, 380–500 V
Rise time [µs]
690 0.37
690 0.86
690 0.25
690 0.33
690 0.82
Rise time [µs]
690 0.23
690 0.38
690 0.94
690 0.26
690 0.46
690 0.94
1
2
100 200
(328) (656)
Motor cable length, m (ft)
Peak voltage [V] dU/dt [V/µs]
1625 3494
2030 1895
1212 3850
1525 3712
2040 1996
Peak voltage [V] dU/dt [V/µs]
1450 5217
1637 3400
1762 1502
1262 3894
1625 2826
1710 1455
. When the drive operates in
line
3
4
300
(984)
MG38C202