http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/RSS.ashxDanfoss Drives PagesMon, 19 Sep 2011 15:44:49 +0200http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/?Page=1http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/?Page=1MAKING MODERN LIVING POSSIBLE VLT® Power Option dU/dt Filter dU/dt filters reduce the dU/dt values on the motor terminal phase-to-phase voltage – an issue that is important for short motor cables. dU/dt filters are differential-mode filters which reduce motor terminal phase-to-phase peak voltage spikes and reduce the rise time to a level that lowers the stress on the insulation of motor windings. Compared to sine-wave filters, the dU/dt filters have a cut-off frequency above the switching frequency. The voltage at the motor terminals is still PWM pulse shaped, but the rise time and Upeak are reduced. They are smaller, weigh less and have a lower price compared to sine-wave filters. Furthermore, because of the smaller inductance and capacitance, the dU/dt filters introduce a negligible reactance between inverter and motor and are therefore suitable for high dynamic applications. Superior compared to output chokes Output chokes cause undamped oscillations at the motor terminals which increase the risk of double pulsing and over-voltages higher than twice the DC link voltage. The dU/dt filters are low-pass L-C filters with a well defined cut-off frequency. Therefore the ringing oscillations at the motor terminals are damped and there is a reduced risk of double pulsing and voltage peaks. Feature Reduces dU/dt stresses Lowers the magnetic interference propagation on surrounding cables and equipment Low voltage drop makes dU/dt filters the ideal solution for highly dynamic applications with flux vector regulation Quality and Design All dU/dt filters are designed and tested for operation with the VLT® AutomationDrive FC 302, VLT® AQUA Drive FC 202, and the VLT® HVAC Drive FC 102. They are designed to match the look and quality of the VLT® FC series drives. Advantages Compatible with all control principles, including flux and WC+ ■ Parallel filter installation is possible for applications in the high power range ■ Range 3 x 200 – 690 V (up to 880 A) Enclosures IP 00 and IP 20/23 enclosure in the entire power range. ■ IP 54 enclosure available up to 180 A. ■ Mounting Side by side mounting with the drive ■ Filters wall mounted up to 480 A (380 V) and floor mounted above that size ■ Perfect match for: – Applications with short motor cables (up to 150 m) – Applications with older motors – Aggressive environments – Applications with frequent braking Benefit Increases motor service interval Trouble-free operation Small size and cost compared to sine-wave filters Facts about our products2011-09-19T15:44:49+02:00http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/?Page=2http://danfoss.ipapercms.dk/Drives/DD/Global/SalesPromotion/Factsheets/OptionFactsheets/02MO015Axx/?Page=2Specifications Voltage rating Nominal current IN @ 50 Hz Motor frequency Ambient temperature Max. switching frequency Mounting Overload capacity Voltage and current without filter Enclosure degree Approvals 3 x 200 – 690 V 44 – 880 A @ 200 – 380 V, 40 – 780 A @ 460 V 32 – 630 A @ 600 V and 27 – 630 A @ 690 V for higher power modules can be paralleled 0 – 60 Hz without derating Max. 100 Hz (with derating) -25° to 45°C without derating fsw 1,5 kHz – 4 kHz depending on filter type Side-by-side 160% for 60 sec every 10 min. IP 00, IP 20/23 and IP 54 CE, UL508 dU/dt limit curves 1.8 1.6 1.4 Upeak V 1.2 1.0 0.8 0.6 0.4 15 m 50 m 150 m 50 m dU/dt filter 150 m dU/dt filter 15 m dU/dt filter IEC60034-25 A IEC60034-17 Voltage and current with filter 0.2 0 0 0.5 1 1.5 tr us 2.0 2.5 3 The dU/dt value decreases with the motor cable length whereas the peak voltage increases. Therefore it is recommended to use sine-wave filters in installations with motor cable lengths above 150 m. Performance Criteria Motor insulation stress Motor bearing stress EMC performance dU/dt filters Up to 100 m cable (shielded/unshielded) complies with the requirements of IEC60034-17* (general purpose motors). Above this cable length the risk of “double pulsing” increases. Slightly reduced, mainly in high power motors. Eliminates motor cable ringing. Does not change the emission class. Does not allow longer motor cables as specified for the frequency converter’s built-in RFI filter. 100 m . 150 m With guaranteed EMC performance: 150 m screened Without guaranteed EMC performance: 150 m unscreened Does not eliminate acoustic switching noise from the motor. 15 – 50% (depending on power size). 50% Sine-wave filters Provides a sinusoidal phase-to-phase motor terminal voltage. Complies with IEC-60034-17* and NEMA-MG1 requirements for general purpose motors with cables up to 500 m (1 km for frame size D and above). Reduces bearing currents caused by circulating currents. Does not reduce common-mode currents (shaft currents). Eliminates motor cable ringing. Does not change the emission class. Does not allow longer motor cables as specified for the frequency converter’s built-in RFI filter. With guaranteed EMC performance: 150 m shielded and 300 m unshielded (only conducted emissions). Without guaranteed EMC performance: up to 500 m (1 km for frame size D and above). Eliminates acoustic switching noise from the motor caused by magnetostriction. 100% 100% Max. motor cable length Acoustic motor switching noise Relative size Relative price *Not 690 V Danfoss VLT Drives, Ulsnaes 1, DK-6300 Graasten, Denmark, Tel. +45 74 88 22 22, Fax +45 74 65 25 80, www.danfoss.com/drives • info@danfoss.com MO015A02 VLT® is a trademark of Danfoss A/S PE-MMSC 2011.082011-09-19T15:44:49+02:00