Danfoss VLT AQUA Drive FC 202 Design Manual

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525–690 VPower size [kW (hp)] Cable [m (ft)] Mains voltage[V]Rise time [μs] Peak voltage [V] dU/dt [V/μs]450–630 (450–650) 30 (98) 690 0.37 1625 349450 (164) 690 0.86 2030 1895710–800 (750–950) 5 (16) 690 0.25 1212 385020 (65) 690 0.33 1525 371250 (164) 690 0.82 2040 1996Table 10.20 IEC dU/dt Test Results for E1h–E4h with Unshielded Cables and No Output Filter, 525–690 VPower size [kW (hp)] Cable [m (ft)] Mains voltage[V]Rise time [μs] Peak voltage [V] dU/dt [V/μs]450–630 (450–650) 5 (16) 690 0.23 1450 521748 (157) 690 0.38 1637 3400150 (492) 690 0.94 1762 1502710–800 (750–950) 5 (16) 690 0.26 1262 389448 (157) 690 0.46 1625 2826150 (492) 690 0.94 1710 1455Table 10.21 IEC dU/dt Test Results for E1h–E4h with Shielded Cables and No Output Filter, 525–690 VNOTICETEST RESULTSNEMA does not provide dU/dt results for 690 V.10.14 Electromagnetic Compatibility (EMC) OverviewElectrical devices both generate interference and are affected by interference from other generated sources. The electro-magnetic compatibility (EMC) of these effects depends on the power and the harmonic characteristics of the devices.Uncontrolled interaction between electrical devices in a system can degrade compatibility and impair reliable operation.Interference takes the form of the following:• Electrostatic discharges• Rapid voltage fluctuations• High-frequency interferenceElectrical interference is most commonly found at frequencies in the range 150 kHz to 30 MHz. Airborne interference fromthe drive system in the range 30 MHz to 1 GHz is generated from the inverter, motor cable, and the motor.Capacitive currents in the motor cable, coupled with a high dU/dt from the motor voltage, generate leakage currents. SeeIllustration 10.16. Shielded motor cables have higher capacitance between the phase wires and the shield, and againbetween the shield and ground. This added cable capacitance, along with other parasitic capacitance and motor inductance,changes the electromagnetic emission signature produced by the unit. The change in electromagnetic emission signatureoccurs mainly in emissions less than 5 MHz. Most of the leakage current (I1) is carried back to the unit through the PE (I3),leaving only a small electromagnetic field (I4) from the shielded motor cable. The shield reduces the radiated interferencebut increases the low-frequency interference on the mains.Electrical Installation Con... Design GuideMG22B102 Danfoss A/S © 05/2017 All rights reserved. 8910 10