EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 1 / 12Effective: 29.12.98ACS600 DU/DT FILTER SELECTION GUIDEOutput voltage of ACS6002Peak voltage and du/dt at the motor terminals 2Voltage vaweform3Applicable motors according to the service life of the insulation system 5Random wound motors 5Form wound motors 5du/dt filters6The enclosure class of the filters6A guide for adding the filter option to an Acknowledgement of Order 6Notes on installation of du/dt filter KITs 7Standard applications 7Other applications 9Pull-out torque with du/dt filter 11EMC 12CE12Bearing currents12APPENDIX 1: du/dt Filter Installation Guide12EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 2 / 12Effective: 29.12.98Output voltage of ACS600Peak voltage and du/dt at the motor terminalsThe output voltage waveform of an inverter creates voltage spikes at the motor terminals in excess to dc-bus voltage. The combination of these voltage spikes and high du/dt-value of IGBT inverter output means additional stresses to motor insulation. This may shorten the life of the motor.In the graphs below the peak value ?LL and the rate of change du/dt of the voltage mesured at the motor terminals are seen as a function of the motor cable length. ?LL is scaled to nominal line-to-line voltage U LLnom . The scale of du/dt is kV/µs.The values of the graphs are typical values measured for ACS600 feeding a nominal load (Udc ?1.35* U LLnom ) to a rated motor. In case of regenerating or braking the value of ?LL is appr. 20 %higher.The values seen in the first graph are mesured without any output filtering. In the second graph the values are measured with the du/dt filter available for ACS600.Graph 1. ?LL/ U LLnom and du/dt at the motor terminals without outputfiltering as a function of motor cable length.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE3 / 12Effective: 29.12.98Graph 2. ?LL/ U LLnom and du/dt at the motor terminals with du/dt filters.Voltage vaweformSome examples of measurements of the voltage at the motor terminals are shown below.U LLnom =690Vai:No output filtering & 30m motor cables.aii:No output filtering & 330m motor cables.bi:du/dt filters & 30m motor cables.bii:du/dt filters & 330m motor cables.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 4 / 12Effective: 29.12.98a i a ia iia iiFig. 1. Measurements without output filtering.b ib ib iib iiEJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 5 / 12Effective: 29.12.98Fig. 2. Measurements with du/dt filterApplicable motors according to the service life of the insulation systemThe motor cabability to withstand the additional stresses depends on the winding technique and insulation system used. When choosing a motor, the motor manufacturer should be consulted to find out whether the motor can be used directly or with du/dt filters. This is important especially in the case of implementing ACS600 to an existing installation. The motor used with ACS 600 must fulfill the following requirements cathegorized by the nominal mains voltage. (Given ?LLw and rise time* (∆t) values are the minimum withstand values of the motor insulation system. In general, the maximum ?LL and du/dt do not occur simultaneously as can be seen in the graphs 1 and 2 of the previous chapter).Random wound motors U LLnom ϒ 420 V ?LLw 3 1300 V.420 V < U LLnom ϒ 500 V?LLw 3 1300 V and du/dt Filter or?LLw 3 1600 V and ∆t ϒ 0.2 µs.500 V < U LLnom ϒ 600 V ?LLw 3 1600 V and du/dt Filter.600 V < U LLnom ϒ 690 V?LLw 3 1800 V and du/dt Filter.Form wound motors U LLnom ϒ 690 VInsulation system that fulfill ?LLw 3 2000 V and ∆t ϒ 0.3 µs can be used without du/dt filter.* Rise time (∆t) is defined as the interval, during which the voltage changes from 10% to 90% of the whole voltage range ∆u. Ref. eg. ¡°G u i de f o r app li ca t on o f cage i nducti on m o t o rs w hen fe from converters (revison of IEC 34-17)¡±, 2/938/CDVEJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 6 / 12Effective: 29.12.98du/dt filtersThere are two types of filters for ACS600: three-phase filters (NOCH0016-6X ... NOCH0070-6X)and single phase filters ( NOCH0120-6X...NOCH0400-6X ). The filters are designed to be cooled by natural convection. Three phase units are wall mounted and single phase types floor mounted unit. For mechanical dimension, see du/dt Filter Installation Guide.The enclosure class of the filtersThe last character of the du/dt Filter Type Code describes the enclosure class. The availableenclosure classes for each filter type are given in the table 1 below.Table 1.Example 1.NOCH0070-60enclosure class IP00A guide for adding the filter option to an Acknowledgement of Order ACS601 & ACS604For ACS601 and ACS604 the du/dt Filter option is external and must be ordered separately with the appropriate enclosure class.Example 1.001ACS60100206XXXXX2XX9XXX 1 pcs 002NOCH0030-60 KIT1 pcsExample 2.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 7 / 12Effective: 29.12.98001ACS60401206XXXXX2XX9XXX 1 pcs 002NOCH0120-60 KIT1 pcsKIT includes 1 three phase filter or 3 single phase filters plus du/dt Filter Installation Guide in a packaging box..ACS607For ACS607 the du/dt Filter option is internal and is added to the Type Code by choosing 5for the 20th character of Type Code. The enclosure class comes with the chosen enclosure class of the cabin.Example 3.001ACS60707606XXXXX2XX 5XXXNotes on installation of du/dt filter KITsWhen installing du/dt filter KITs, the following must be noted:ϒ The filters are designed to be cooled by natural convection.ϒ Free air flow must be arranged. 300 mm of free space must be left above, below (wall mounted types), left, right, front and back (floor mounted types) of the filter. Minimum 50 mm must be left between the single phase filters of a KIT.ϒ When installing a filter below an inverter unit, minimum 500mm free space must be left under the unit.ϒ For IP22 and IP54 filters, the maximum temperature rise of the enclosure surface is 40ϒ.ϒ Maximum cable length between the inverter and the filter is 3 m.ϒ IP00 filters must be enclosed by the customer to meet the local safety requirements.S tandard applications A n appropriate du/dt filter for standard applications for I N current can be chosen with the aid of table 1.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 8 / 12Effective: 29.12.98T able 1.A n appropriate du/dt filter for I NSQ current can be chosen with the aid of table 2. Note that the filter type in table 2 is not necessarily the same as the factory installed type in ACS607 (Table 1). In ACS607 the factory installed du/dt filter is mainly dimensioned for I N and I HD -currents. However,in ACS607 types 0100-3, 0140-3, 0170-3, 0260-3, 0120-5, 0170-5, 0210-5 and 0320-5 the factory installed du/dt filter can also be used with I NSQ current. See Table 2.T able 2.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 9 / 12Effective: 29.12.98N otes and limitations:ϒ du/dt filters are needed to protect the motor insulation because of the reasons explainedabove.ϒ Maximum motor cable lengths:NOCH0016-6X ... NOCH0070-6X :150 m (IP00, IP22) (300 m two filters in series) 50 m(IP54)(100 m two filters in series)NOCH0120-6X ... NOCH0400-6X :300 mϒ The cable length is cumulative in case of parallel connected motors.ϒ No restrictions to the cable types.ϒ Maximum output frequency is 120 Hz.ϒ For information on maximum cable lengths of inverters, see ACS600 Technical Catalogue .O ther applicationsF or other applications filters are chosen by the maximum thermal current Ith and the maximum energy E = ?C(U dc )2 according to table 3 below. The maximum losses per filterare also given in the table. I th:Total rms current of the filter.C :Total capacitance of the motor cable(s). ( Capacitance / length given in the cablecatalogue times the cumulative length of the motor cables ).U dc :Average dc-bus voltage.T able 3.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 10 / 12Effective: 29.12.98E xample 1.ϒ Three motors in parallel.ϒ 100 m MCMK 3x25+16; C = 0,45 µF / km;Ith1 = 62 A ϒ 150 m MCMK 3x25+16; C = 0,45 µF / km;Ith2 = 62 A ϒ 100 m MCMK 3X50+16; C = 0,6 µF / km;Ith3 = 91 AΤC = 0,250 x 0,45 µF + 0,1 x 0,6 µF = 173 nFIth = 215 Aϒ U = 510 VΤ Udc ? 1.35 x 510V = 689 V Τ E = 41 mJΤNOCH0260-60 KITN otes and limitations:ϒ Long-distance mode must be chosen.ϒ Maximum output frequency is 120 Hz.ϒ Maximum switching frequency is 2 kHzϒ Each separate cable (1-phase or 3-phase) is taken into account, when calculating the cumulative length of the motor cable(s).ϒ Above + 40ϒ C, the thermal current must be decreased 3.5% for every additional 1ϒC (up to + 50 ϒ C).ϒ For information on maximum cable lengths of inverters, see ACS600 Technical Catalogue .ϒ For other applications please contact ABB Industry for application design.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 11 / 12Effective: 29.12.98Pull-out torque with du/dt filterdu/dt filter is based on reactors and creates an additional voltage drop to the output voltage. The voltage drop decreases the pull-out torque. The decrease can be estimated by the following formula:T TN L L LkTTN L Lk =+====σσσpull -out torque with filter pull -out torque without filter motor transient inductance reactor phase inductanceAn adequate approximation of transient inductance is the sum of stator leakage inductance and rotor leakage inductance referred to stator.RsL σsLmL σr 'Rr ' / sU / ? 3σσσσσL L s L r L s L r ?+=='' ; transient inductance stator leakage inductancerotor leakage inductance referred to stator For reactor phase inductances see the table 4. belowdu/dt filter Lk / µHdu/dt filter Lk / µHNOCH0016-6X 150NOCH0120-6X 92NOCH0030-6X 140NOCH0260-6X 74NOCH0070-6X115NOCH0400-6X52Table 4.EJQ 29.12.1998MarkoVen?l?inenMatti LaitinenE 12 / 12Effective: 29.12.98Note:With long motor cables, the decrease of pull-out torque due to cable resistance and inductance is usually more important than that of caused by the filter.EMCWhen used together with ACS600, du/dt filters comply with relevant EMC standards. Additonally,du/dt filter decreases capacitive leakage currents and high frequency emission of the motor cable as well as high frequency losses at the motor.CEThe CE marking indicates that the product works in conformity with the directives that are valid for the product. The CE marking of du/dt filters indicates that the product works in conformity with the Low Voltage Directive and EMC Directive.Bearing currentsSingle phase du/dt filters ( NOCH0120-6X ... NOCH0400-6X ) effectively damp the bearing currents. For more information about the bearing currents refer to High frequency bearing currents in low voltage asynchronous motors. / ABB Industry Oy & ABB Motors OyAPPENDIX 1:du/dt Filter Installation Guide 3AFY 58933368。