DU/dt Filters
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DU/dt Filters filters DU/dt Filters - Protects the motor-reducing dU/dt value of the drive output voltage - Reduction of motor temperature - Increases the lifetime of the motor - Open frame design - UL listed materials used - Cable length up to 300m Motor winding insulation experiences higher voltage stress­es when used with a variable speed drive than when con­nected directly to the mains supply. The higher stresses de­pend on the motor cable length. The stresses are caused by the fastrising voltage pulses of the drive and transmission line effects in the cable. DU/dt filters reduce the insulation stress of the motors by lowering the dU/dt- value of the variable speed drive out­ put voltage. The reduced stress increases the lifetime of the motor windings. Schematic diagram DU/dt filters can be used with cable lengths up to 100-300m, depending on the model. DU/dt-filters are designed for a maximum switching fre­ quency of 4,0 kHz. The filters generate less heat with lower switching frequencies, so it is possible to use lower switch­ing frequencies. DU/dt- filters can also be used in retrofit applications, where the motor is not designed for use with a variable speed drive. According to IEC TS 60034-17, for motors rated at voltages up to 500Vac, the insulation system should typically have a satisfactory life time when subjected to peak voltages shown in the figure. Choose a filter with a rated current greater than the rated current of the motor. If the working frequency of the motor is greater than 70 Hz, use the derating curve to determine the maximum current allowed for the filter. For more information about other dU/dt limits, please read Gambica / Rema technical report No. 1, third edition, Variable speed drives and motors, Motor insulation voltage stresses under PWM inverter operation. Derating curve ofof dU/dtfilter Derating curve current DU/dt limit curves 120 100 I/In [%] 80 60 40 20 0 0 50 100 150 200 Working frequency f [Hz] 250 300 350 The waveform of the motor voltage without dU/dt- filter The waveform of the motor current with dU/dt- filter The typical voltage pulse shape in the terminals of the motor with dU/dt- filter The typical voltage pulse of the inverter output and the voltage pulse of the motor input with dU/dt- filter. Technical specifications Standards Design Operating voltage range Motor frequency Max switching frequency Typical overshoot Rated current [A] 12 25 55 80 130 210 280 350 420 600 820 1250 1500 2 x 1250 2 x 1500 Water cooled 1250 1500 EN 61558-2-20, LVD 2006/95/ EC, UL/Ur, RoHs, CE Open frame design 3x200-690 Vac ±10% 0-70 Hz without derating 70-320 Hz with derating 4 kHz 50 % of DC link voltage Voltage loss Ambient temperature Storage temperature Humidity Overload capacity Insulation temp. class Protection class Inductance [uH] 900 355 196 135 83,1 51,4 38,6 30,9 25,7 18,0 13,2 8,6 7,2 4,3 3,6 Typical losses [W] 50 70 110 130 180 260 350 480 510 690 950 1080 1329 2210 2708 Max. cable length [m] 100 100 150 150 200 250 250 300 300 300 300 300 300 300 300 8,6 7,2 1240 1440 300 300 < 5V at nominal current - 20 ... +40 °C in operation - 20 ... +70 °C <95 % RH, no condensation 1,5 rated current for 1min, once per 60min H 180 °C IP00 Cable type, max. cross section [mm2] 3x10+10 Cu 3x10+10 Cu 3x35+16 Cu 3x35+16 Cu 3x95+70 Cu 3x150+70 Cu 2x 3x120+70 Cu 2x 3x185 Al+57 Cu 2x 3x240 Al+72 Cu 4x 3x120 Al+41 Cu 4x 3x185mm2 Al+57 Cu 6x 3x240mm2 Al+72 Cu 6x 3x240mm2 Al+72 Cu 6x 3x240mm2 Al+72 Cu 6x 3x240mm2 Al+72 Cu 2x 6x 3x240mm2 Al+72 Cu 2x 6x 3x240mm2 Al+72 Cu Note! The maximum cable length is limited. When the cable length is over the maximum value the filter will overheat. If the cable length is not sufficient use a filter one size larger. filters / du/dt filters / 12-3000a, type dudt Mechanical data 12A - 25A Mechanical data 55A - 80A D D C C G G E F E A B A Mechanical data 130A - 820A F B Mechanical data 1250A - 1500A D D C C G G F A Rated current [A] Order code DUDT12 DUDT25 DUDT55 DUDT80 DUDT130 DUDT210 DUDT280 DUDT350 DUDT420 DUDT600 DUDT820 DUDT1250 DUDT1500 DUDT2x1250 DUDT2x1500 Water cooled DUDT1250W DUDT1500W E A B F B A [mm] B [mm] C [mm] D [mm2] E [mm] F [mm] G [mm] Weight [kg] 134 180 225 80 107 100 135 175 208 10 10 35 126 120 176 51 79 77 6x7 8x14 10x13 2,30 5,40 9,20 Cu 0,27 Al 0,28 Al 0,88 245 245 282 282 300 310 360 375 433 442 886 904 110 160 215 220 240 245 280 280 377 433 377 433 245 190 240 310 385 395 395 510 556 670 556 670 35 Busbar 7x11 Busbar Ø10 Busbar Ø10 Busbar Ø14 Busbar Ø14 Busbar Ø14 Busbar Ø14 Busbar 4xØ14 Busbar 4xØ14 Busbar 4xØ14 Busbar 4xØ14 176 176 200 250 250 250 250 250 153 143 153 143 78 88 117 135 154 158 164 164 337 393 377 393 10x13 10x13 11x20 11x20 11x20 11x20 11x20 11x20 13x18 13x18 13x18 13x18 12,90 16,80 26,60 38,80 50,00 55,00 72,00 98,00 132,00 166,00 279,00 347,00 Al 2,19 Al 2,19 Al 3,13 Al 3,29 Al 5,60 Al 6,29 Al 12,29 Al 12,81 Al 10,39 Al 17,30 Al 20,78 Al 34,60 390 390 370 375 546 573 Busbar 4xØ14 Busbar 4xØ14 108 108 330 335 13x18 13x18 85,00 105,00 Al 17,12 Al 18,39 Trafox is a brand of Muuntosähkö Oy. We develop, manufacture and customise high-quality transformers, chokes, filters and Trafox Superintend® monitoring devices for a large number of applications. – Muuntosähkö Oy Trafox P.O. Box 10 | FI-00621 Helsinki | Tel. +358 207 933 700 | Fax +358 207 933 746 | sales@trafox.fi Cu / Al weight [kg] VTO-11-00-850 rev6 05/2015 E
