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How to select the correct size DS7 Soft Starter for standard duty applications.ApplicationThe DS7 is a two phase control soft starter utilizedto accomplish motor starting using the reducedvoltage method. Typically, the motor Horsepoweror kW rating is used to determine the required sizeof the soft starter. This document addresses otherfactors that require consideration in accomplishingthe proper match of soft starter to the load.OverviewSoft starter sizing is typically determined by theHorsepower or kW rating of the motor, coupledwith the mains operating voltage. Using this infor-mation, a table or graph is consulted to determinethe minimum size of the soft starter for the appli-cation. If the application is considered to be severeduty, it is commonplace to select the next sizelarger soft starter to accommodate the higher loadcurrents.The graphs and tables published for the DS7 arebased on an inrush value of 300% FLA or 400%FLA of the motor. If the actual inrush currentapproaches a value of 400% FLA, the maximumallowable ramp times are significantly affected.Additionally, the ramp times also must be consid-ered independently, as when the ramp times areincreased even though the inrush current does notchange, the maximum allowable current capacityis reduced. When selecting the size of the DS7soft starter, Tables 1 – 4 may be used if the antici-pated ramp times are 10 seconds or less. Pleasenote that either 300% or 400% Current Limitrefers to the maximum anticipated start current interms of motor FLA (3x or 4x). The DS7 does nothave a current limiter function. If the ramp timesare expected to be longer, Tables 5 – 11 should bereviewed to ensure that the soft starter is not sub-jected to excessive current resulting in SCR failure.The size of the soft starter may be required to beincreased specifically due to a longer ramp time.NThe DS7 Soft Starter may be incorrectly sized ifNote:based solely on motor Horsepower or kW rating andmains voltage alone.Tht DS7 SNfo Soarotr rtquirts ohao sptcificaootnoiNn is givtn oN owN facoNrse:Uloimaot lNad –• the maximum inrush currentthat the soft starter will transmit anytime duringthe start process.Ramp oimt –• the expected, or required, ramptime required for the motor to achieve synchro-nous speed.2Application Paper AP03901006EEffective December 2010How to select the correct size DS7 Soft Starter for standard duty applicationseAtOn cOrpOrAtiOn Examplt 17.5HP Motor (11A FLA) @ 460V Application, Maximum Current 300% FLA @ 40oC with an estimated start ramp time of 8 seconds and 4 starts per hour.Consulting Table 1, the DS7-340SX012NO-N soft starter shows an acceptable maximum motor size of 7.5HP . Please note that Tables 1 thru 4 indicate maximum allowable start ramp times of 10 seconds @ 1 start/hr for these selections. Consulting Table 8, the maximum allowable start current is noted as 36A, and the maximum allow-able start ramp time is 8 seconds. Under these conditions, a DS7-340SX012NO-N soft starter is the appropriate selection for this application.Examplt 2With the same operating conditions as in Example 1, it is deter-mined that the ramp time must be extended to 12 seconds for the motor to achieve synchronous speed. Consulting Table 8, the maximum allowable start current for 12 seconds (noted in Table 8 as 12.1 seconds) is indicated as 30A, less than the required 33A (3 x 11 amps). Under these conditions, the DS7-340SX012NO-N soft starter would not be an appropriate selection. Table 9 for the next higher size soft starter, lists the maximum allowable start current @ 12 sec-onds (interpolating between 11.9 and 12.9 seconds) as approximately 37A. Under these new conditions, the next size higher soft starter, DS7-340SX016NO-N is the suitable choice, as the maximum allow-able start current for these conditions is sufficient for proper opera-tion.Examplt 3With the same operating conditions as in Example 1, it is deter-mined that the inrush current requires a 400% Current Limit. This operating condition will also require a larger capacity soft starter (DS7-340SX016NO-N) to accommodate the higher operating current (44 amps) during the start ramp time.ManualsRtftrtnct NumbtrDS7 Instructional Leaflet DS7 CatalogPrNgram Filts nNnt Ouolint DrawingsnNntSupporting documentationAdditional helpIn the event additional help is needed, please contact the Technical Resource Center at 1-877-ETN-CARE. OpoiNn 2, Sub OpoiNn 2.3Application Paper AP03901006EEffective December 2010eAtOn cOrpOrAtiOn How to select the correct size DS7 Soft Starter for standard duty applications10 StcNnd Ramp, 1 Soaro ptr HNur, 300% Currtno Limio @ 40ºC.T ablt 1. MNoNr PNwtr (hp)Raotd Currtno Amps200V230V480VMaximum AllNwablt Brtaktr SiztMaximum AllNwablt Fust SiztRtcNmmtndtd XTOB OvtrlNadRtcNmmtndtd C440 OvtrlNadMMPDS7-340SX004NO-N 3.70.750.752HFD301515A Class RK5XTOB040DC11C440A1A005SAXXTPR004BC1DS7-342SX004NO-N DS7-340SX007NO-N 6.9 1.523HFD301515A Class RK5XTOB057DC11C440A1A020SAX XTPR6P3BC1DS7-342SX007NO-N DS7-340SX009NO-N 7.8225HFD302020A Class RK5XTOB065DC11C440A1A020SAX XTPR010BC1DS7-342SX009NO-N DS7-340SX012NO-N 11337.5HFD303020A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR012BC1DS7-342SX012NO-N DS7-340SX016NO-N 15.23510HFD303525A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR016BC1DS7-342SX016NO-N DS7-340SX024NO-N 2257.515HFD306040A Class RK5XTOB125GC1S 2C440A1A045SAX XTPR025BC1DS7-342SX024NO-N DS7-340SX032NO-N 327.51020HFD307050A Class RK5XTOB160GC1S 2C440A1A045SAX XTPR032BC1DS7-342SX032NO-N1 XTOBXDIND Panel Mounting Adapter must be used with this overload.2XTOBXTLL line and load lugs must be used with this overload.10 StcNnd Ramp, 1 Soaro ptr HNur, 400% Currtno Limio @ 40ºC.T ablt 2. MNoNr PNwtr (hp)Raotd Currtno Amps200V230V480VMaximum AllNwablt Brtaktr SiztMaximum AllNwablt Fust SiztRtcNmmtndtd XTOB OvtrlNadRtcNmmtndtd C440 OvtrlNadMMPDS7-340SX004NO-N 30.50.51.5HFD301515A Class RK5XTOB040DC11C440A1A005SAXXTPR004BC1DS7-342SX004NO-N DS7-340SX007NO-N 4.8113HFD301515A Class RK5XTOB057DC11C440A1A020SAX XTPR6P3BC1DS7-342SX007NO-N DS7-340SX009NO-N 6.9 1.523HFD302020A Class RK5XTOB065DC11C440A1A020SAX XTPR010BC1DS7-342SX009NO-N DS7-340SX012NO-N 9225HFD303020A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR012BC1DS7-342SX012NO-N DS7-340SX016NO-N 11337.5HFD303525A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR016BC1DS7-342SX016NO-N DS7-340SX024NO-N 17.55510HFD306040A Class RK5XTOB125GC1S 2C440A1A045SAX XTPR025BC1DS7-342SX024NO-N DS7-340SX032NO-N 2257.515HFD307050A Class RK5XTOB160GC1S 2C440A1A045SAX XTPR032BC1DS7-342SX032NO-N1 XTOBXDIND Panel Mounting Adapter must be used with this overload.2XTOBXTLL line and load lugs must be used with this overload.4Application Paper AP03901006EEffective December 2010How to select the correct size DS7 Soft Starter for standard duty applicationseAtOn cOrpOrAtiOn 10 StcNnd Ramp, 1 Soaro ptr HNur, 300% Currtno Limio @ 40ºC.T ablt 3. MNoNr PNwtr (kW)Raotd Currtno Amps230V400VMaximum AllNwablt Brtaktr SiztMaximum AllNwablt FustSiztRtcNmmtndtd XTOB OvtrlNadRtcNmmtndtd C440 OvtrlNadMMPDS7-340SX004NO-N 3.80.751.5HFD301515A Class RK5XTOB040DC11C440A1A005SAXXTPR004BC1DS7-342SX004NO-N DS7-340SX007NO-N 7 1.53HFD301515A Class RK5XTOB057DC11C440A1A020SAX XTPR6P3BC1DS7-342SX007NO-N DS7-340SX009NO-N 9 2.24HFD302020A Class RK5XTOB065DC11C440A1A020SAX XTPR010BC1DS7-342SX009NO-N DS7-340SX012NO-N 123 5.5HFD303020A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR012BC1DS7-342SX012NO-N DS7-340SX016NO-N 1647.5HFD303525A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR016BC1DS7-342SX016NO-N DS7-340SX024NO-N 24 5.511HFD306040A Class RK5XTOB125GC1S 2C440A1A045SAX XTPR025BC1DS7-342SX024NO-N DS7-340SX032NO-N 327.515HFD307050A Class RK5XTOB160GC1S 2C440A1A045SAX XTPR032BC1DS7-342SX032NO-N1 XTOBXDIND Panel Mounting Adapter must be used with this overload.2XTOBXTLL line and load lugs must be used with this overload.10 StcNnd Ramp, 1 Soaro ptr HNur, 400% Currtno Limio @ 40ºC.T ablt 4. MNoNr PNwtr (kW)Raotd Currtno Amps230V400VMaximum AllNwablt Brtaktr SiztMaximum AllNwablt FustSiztRtcNmmtndtd XTOB OvtrlNadRtcNmmtndtd C440 OvtrlNadMMPDS7-340SX004NO-N 2.50.331HFD301515A Class RK5XTOB040DC11C440A1A005SAXXTPR004BC1DS7-342SX004NO-N DS7-340SX007NO-N 3.80.75 1.5HFD301515A Class RK5XTOB057DC11C440A1A020SAX XTPR6P3BC1DS7-342SX007NO-N DS7-340SX009NO-N 7 1.53HFD302020A Class RK5XTOB065DC11C440A1A020SAX XTPR010BC1DS7-342SX009NO-N DS7-340SX012NO-N 9 2.24HFD303020A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR012BC1DS7-342SX012NO-N DS7-340SX016NO-N 123 5.5HFD303525A Class RK5XTOB100GC1S 2C440A1A020SAX XTPR016BC1DS7-342SX016NO-N DS7-340SX024NO-N 1647.5HFD306040A Class RK5XTOB125GC1S 2C440A1A045SAX XTPR025BC1DS7-342SX024NO-N DS7-340SX032NO-N 24 5.511HFD307050A Class RK5XTOB160GC1S 2C440A1A045SAX XTPR032BC1DS7-342SX032NO-N1 XTOBXDIND Panel Mounting Adapter must be used with this overload.2XTOBXTLL line and load lugs must be used with this overload.5Application Paper AP03901006EEffective December 2010eAtOn cOrpOrAtiOn How to select the correct size DS7 Soft Starter for standard duty applicationsT ablt 5. DS7-340SX004NO-N, DS7342SX004NO-N Soaro Currtno Soaro Ramp Timt (s)4 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy41135.0112.590.075.027.64 1.1110.291.873.560.022.75 1.291.576.261.048.819.15 1.377.064.251.340.316.36 1.465.654.743.733.814.06 1.556.547.137.628.612.26 1.649.140.932.724.410.77 1.743.035.828.621.09.57 1.837.931.625.318.38.48 1.933.628.022.416.07.68230.025.020.014.1 6.88 2.126.922.417.912.4 6.29 2.224.320.216.211.1 5.69 2.322.018.314.69.9 5.110 2.419.916.613.38.9 4.710 2.518.215.212.18.0 4.310 2.616.613.911.17.2 4.011 2.715.312.710.2 6.6 3.711 2.814.111.79.4 6.0 3.512 2.913.010.88.6 5.5 3.212312.010.08.0 5.0 3.012 3.110.58.87.1 4.5 2.713 3.29.37.7 6.3 4.0 2.413 3.38.2 6.8 5.6 3.6 2.214 3.47.3 6.1 5.0 3.2 1.914 3.5 6.5 5.4 4.5 2.9 1.814 3.6 5.9 4.9 4.1 2.7 1.615 3.7 5.3 4.4 3.7 2.4 1.515 3.8 4.8 4.0 3.4 2.2 1.316 3.9 4.4 3.6 3.1 2.0 1.21644.03.32.81.91.1T ablt 6. DS7-340SX007NO-N, DS7342SX007NO-N Soaro CurrtnoSoaro Ramp Timt (s)7 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy71135.0112.590.075.027.68 1.1110.291.873.560.022.78 1.291.576.261.048.819.19 1.377.064.251.340.316.310 1.465.654.743.733.814.011 1.556.547.137.628.612.211 1.649.140.932.724.410.712 1.743.035.828.621.09.513 1.837.931.625.318.38.413 1.933.628.022.416.07.614230.025.020.014.1 6.815 2.126.922.417.912.4 6.215 2.224.320.216.211.1 5.616 2.322.018.314.69.9 5.117 2.419.916.613.38.9 4.718 2.518.215.212.18.0 4.318 2.616.613.911.17.2 4.019 2.715.312.710.2 6.6 3.720 2.814.111.79.4 6.0 3.520 2.913.010.88.6 5.5 3.221312.010.08.0 5.0 3.022 3.110.58.87.1 4.5 2.722 3.29.37.7 6.3 4.0 2.423 3.38.2 6.8 5.6 3.6 2.224 3.47.3 6.1 5.0 3.2 1.925 3.5 6.5 5.4 4.5 2.9 1.825 3.6 5.9 4.9 4.1 2.7 1.626 3.7 5.3 4.4 3.7 2.4 1.527 3.8 4.8 4.0 3.4 2.2 1.327 3.9 4.4 3.6 3.1 2.0 1.22844.03.32.81.91.16Application Paper AP03901006EEffective December 2010How to select the correct size DS7 Soft Starter for standard duty applicationseAtOn cOrpOrAtiOn T ablt 7. DS7-340SX009NO-N, DS7342SX009NO-N Soaro Currtno Soaro Timt (s)9 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy91135.0112.590.075.027.610 1.1110.291.873.560.022.711 1.291.576.261.048.819.112 1.377.064.251.340.316.313 1.465.654.743.733.814.014 1.556.547.137.628.612.214 1.649.140.932.724.410.715 1.743.035.828.621.09.516 1.837.931.625.318.38.417 1.933.628.022.416.07.618230.025.020.014.1 6.819 2.126.922.417.912.4 6.220 2.224.320.216.211.1 5.621 2.322.018.314.69.9 5.122 2.419.916.613.38.9 4.723 2.518.215.212.18.0 4.323 2.616.613.911.17.2 4.024 2.715.312.710.2 6.6 3.725 2.814.111.79.4 6.0 3.526 2.913.010.88.6 5.5 3.227312.010.08.0 5.0 3.028 3.110.58.87.1 4.5 2.729 3.29.37.7 6.3 4.0 2.430 3.38.2 6.8 5.6 3.6 2.231 3.47.3 6.1 5.0 3.2 1.932 3.5 6.5 5.4 4.5 2.9 1.832 3.6 5.9 4.9 4.1 2.7 1.633 3.7 5.3 4.4 3.7 2.4 1.534 3.8 4.8 4.0 3.4 2.2 1.335 3.9 4.4 3.6 3.1 2.0 1.23644.03.32.81.91.1T ablt 8. DS7-340SX012NO-N, DS7342SX012NO-N Soaro CurrtnoSoaro Ramp Timt (s)12 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy121135.0112.590.075.027.613 1.1110.291.873.560.022.714 1.291.576.261.048.819.116 1.377.064.251.340.316.317 1.465.654.743.733.814.018 1.556.547.137.628.612.219 1.649.140.932.724.410.720 1.743.035.828.621.09.522 1.837.931.625.318.38.423 1.933.628.022.416.07.624230.025.020.014.1 6.825 2.126.922.417.912.4 6.226 2.224.320.216.211.1 5.628 2.322.018.314.69.9 5.129 2.419.916.613.38.9 4.730 2.518.215.212.18.0 4.331 2.616.613.911.17.2 4.032 2.715.312.710.2 6.6 3.734 2.814.111.79.4 6.0 3.535 2.913.010.88.6 5.5 3.236312.010.08.0 5.0 3.037 3.110.58.87.1 4.5 2.738 3.29.37.7 6.3 4.0 2.440 3.38.2 6.8 5.6 3.6 2.241 3.47.3 6.1 5.0 3.2 1.942 3.5 6.5 5.4 4.5 2.9 1.843 3.6 5.9 4.9 4.1 2.7 1.644 3.7 5.3 4.4 3.7 2.4 1.546 3.8 4.8 4.0 3.4 2.2 1.347 3.9 4.4 3.6 3.1 2.0 1.24844.03.32.81.91.17Application Paper AP03901006EEffective December 2010eAtOn cOrpOrAtiOn How to select the correct size DS7 Soft Starter for standard duty applicationsT ablt 9. DS7-340SX016NO-N, DS7342SX016NO-N Soaro Currtno Soaro Ramp Timt (s)16 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy161110.2101.356.328.123.018 1.191.082.646.923.719.019 1.276.468.639.720.315.921 1.365.057.734.117.613.522 1.456.049.229.715.511.724 1.548.742.426.113.810.226 1.642.836.823.112.48.927 1.737.932.220.711.27.929 1.833.728.418.610.27.030 1.930.225.216.89.4 6.332227.322.515.38.7 5.734 2.124.720.214.08.0 5.135 2.222.518.212.97.5 4.737 2.320.616.511.97.0 4.338 2.418.915.011.1 6.6 3.940 2.517.413.610.3 6.3 3.642 2.616.012.59.6 5.9 3.343 2.714.911.59.0 5.7 3.145 2.813.810.58.4 5.4 2.946 2.912.99.77.9 5.2 2.748312.09.07.5 5.0 2.550 3.110.88.1 6.8 4.7 2.251 3.29.87.3 6.2 4.4 2.053 3.38.9 6.6 5.7 4.1 1.854 3.48.1 6.0 5.2 3.8 1.656 3.57.3 5.5 4.8 3.6 1.558 3.6 6.7 5.0 4.4 3.4 1.359 3.7 6.2 4.6 4.1 3.2 1.261 3.8 5.7 4.2 3.8 3.0 1.162 3.9 5.2 3.9 3.5 2.9 1.06444.83.63.22.70.9T ablt 10. DS7-340SX024NO-N, DS7342SX024NO-N Soaro CurrtnoSoaro Ramp Timt (s)24 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy241110.2101.356.328.123.026 1.191.082.646.923.719.029 1.276.468.639.720.315.931 1.365.057.734.117.613.534 1.456.049.229.715.511.736 1.548.742.426.113.810.238 1.642.836.823.112.48.941 1.737.932.220.711.27.943 1.833.728.418.610.27.046 1.930.225.216.89.4 6.348227.322.515.38.7 5.750 2.124.720.214.08.0 5.153 2.222.518.212.97.5 4.755 2.320.616.511.97.0 4.358 2.418.915.011.1 6.6 3.960 2.517.413.610.3 6.3 3.662 2.616.012.59.6 5.9 3.365 2.714.911.59.0 5.7 3.167 2.813.810.58.4 5.4 2.970 2.912.99.77.9 5.2 2.772312.09.07.5 5.0 2.574 3.110.88.1 6.8 4.7 2.277 3.29.87.3 6.2 4.4 2.079 3.38.9 6.6 5.7 4.1 1.882 3.48.1 6.0 5.2 3.8 1.684 3.57.3 5.5 4.8 3.6 1.586 3.6 6.7 5.0 4.4 3.4 1.389 3.7 6.2 4.6 4.1 3.2 1.291 3.8 5.7 4.2 3.8 3.0 1.194 3.9 5.2 3.9 3.5 2.9 1.09644.83.63.22.70.98Application Paper AP03901006EEffective December 2010How to select the correct size DS7 Soft Starter for standard duty applicationseAtOn cOrpOrAtiOn T ablt 11. DS7-340SX032NO-N, DS7342SX032NO-N Soaro Currtno Soaro Ramp Timt (s)32 Amps1/hr 1/hr 4/hr 10/hr 20/hr Inrush25°C 40°C 40°C 40°C 40°C AmpsMuloiplt75% duoy75% duoy75% duoy75% duoy75% duoy321110.282.756.328.114.135 1.191.068.246.923.711.838 1.276.457.339.720.310.142 1.365.048.834.117.68.845 1.456.042.029.715.57.848 1.548.736.526.113.8 6.951 1.642.832.123.112.4 6.254 1.737.928.420.711.2 5.658 1.833.725.318.610.2 5.161 1.930.222.716.89.4 4.764227.320.515.38.7 4.367 2.124.718.514.08.0 4.070 2.222.516.912.97.5 3.774 2.320.615.411.97.0 3.577 2.418.914.111.1 6.6 3.380 2.517.413.010.3 6.3 3.183 2.616.012.09.6 5.9 3.086 2.714.911.19.0 5.7 2.890 2.813.810.48.4 5.4 2.793 2.912.99.67.9 5.2 2.696312.09.07.5 5.0 2.599 3.110.88.1 6.8 4.7 2.3102 3.29.87.3 6.2 4.4 2.2106 3.38.9 6.6 5.7 4.1 2.1109 3.48.1 6.0 5.2 3.9 1.9112 3.57.3 5.5 4.8 3.7 1.8115 3.6 6.7 5.0 4.4 3.5 1.7118 3.7 6.2 4.6 4.1 3.3 1.6122 3.8 5.7 4.2 3.8 3.1 1.6125 3.9 5.2 3.9 3.5 2.9 1.512844.83.63.22.81.44 Amp Raotd DS7-340SX004NO-N, DS7-342SX004NO-NFigurt 1e: Maximum Ramp Timt @ 300% Framt Sizt (3 x 4 = 12 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 10 seconds 4 Starts per hour (40°) = 8 seconds7 Amp Raotd DS7-340SX007NO-N, DS7-342SX007NO-NFigurt 2e: Maximum Ramp Timt @ 300% Framt Sizt (3 x 7 = 21 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 10 seconds4 Starts per hour (40°) = 8 seconds9Application Paper AP03901006EEffective December 2010eAtOn cOrpOrAtiOn How to select the correct size DS7 Soft Starter for standard duty applications9 Amp Raotd DS7-340SX009NO-N, DS7-342SX009NO-NFigurt 3e:Maximum Ramp Timt @ 300% Framt Sizt (3 x 9 = 27 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 10 seconds 4 Starts per hour (40°) = 8 seconds12 Amp Raotd DS7-340SX012NO-N, Figurt 4e:DS7-342SX012NO-NMaximum Ramp Timt @ 300% Framt Sizt (3 x 12 = 36 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 10 seconds 4 Starts per hour (40°) = 8 seconds16 Amp Raotd DS7-340SX016NO-N, Figurt 5e: DS7-342SX016NO-NMaximum Ramp Timt @ 300% Framt Sizt (3 x 16 = 48 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 9 seconds 4 Starts per hour (40°) = 7.5 seconds24 Amp Raotd DS7-340SX024NO-N, Figurt 6e:DS7-342SX024NO-NMaximum Ramp Timt @ 300% Framt Sizt (3 x 24 = 72 Amps) 1 Start per hour (25°) = 12 seconds 1 Start per hour (40°) = 9 seconds 4 Starts per hour (40°) = 7.5 secondsApplication Paper AP03901006E Effective December 2010EaoNn CNrpNraoiNnElectrical Sector1111 Superior Ave.Cleveland, OH 44114United States877-ETN-CARE (877-386-2273)© 2010 Eaton CorporationAll Rights ReservedPrinted in USAPublication No. AP03901006E / TN December 2010Eaton and PowerChain Management areregistered trademarks of Eaton Corporation.All other trademarks are property of theirrespective owners.How to select the correct size DS7 Soft Starter for standard duty applications32 Amp Raotd DS7-340SX032NO-N,Figurt 7e:DS7-342SX032NO-NMaximum Ramp Timt @ 300% Framt Sizt (3 x 32 = 96 Amps) 1 Start per hour (25°) = 12 seconds1 Start per hour (40°) = 10 seconds4 Starts per hour (40°) = 8 seconds。

技术资料控制产品－软起动器PSR•PSS••PST/PSTB（带力矩控制）Softstarter电压 Ｖ100 %电流 /力矩 /时间电动机转速电动机转速图中所示的是直接起动、星/三角起动和软起动在电动机电压 (V)、电动机电流 (I) 和电动机力矩 (T) 时的不同表现。

58 %70 %30 %电动机电压直接起动直接起动直接起动软起动软起动星 / 三角起动软起动可调节的起动斜坡曲线星 / 三角起动星 / 三角起动电动机电流电动机力矩软起动器当第一台电动机出现时，工程师就一直在寻找一种方法，避免在使用直接起动和星三角起动时出现的电气和机械问题。

自20世纪80年代初，ABB 就一直生产软起动器，并且拥有宝贵的经验。

如今这些经验也融入到产品系列的设计中。

最新推出的PST 系列是 ABB 在软起动技术上的一次重大进步。

应用了现代电力电子学中的智能电路和软件，ABB 开发出的软起动器可以出色地使用电子元件来控制电动机起动和停止时的电流和电压，同时还添加了几种设计特性。

机械和电气问题的解决方案交流电动机 — 被称做 "工业的驮马"，用于驱动风扇、压碎机、搅拌机、水泵、输送带等设备。

在全世界的生产中，它经常引发不必要的负荷高峰。

这些不良的起动方式造成多方面的损坏，其中包括：电气问题，在直接起动或星三角起动中产生的电压和电•流突变，带来了大量的电气问题。

这些突变现象可能使得本地电网过载，并产生不可接受的电压波动，从而影响与电网连接的其他设备。

机械问题，整条传动链 (从电动机到受驱动的设备) 都会•受到剧烈的应力。

运行问题，例如管道的压力、损坏输送带上的产品，以•及引起乘坐升降机的不舒适。

经济损失也应当受关注的：每个技术问题和故障后，以及因需要维修及停产所造成的大量损失。

解决这些问题的简单方法是安装ABB 的PSR 、PSS 或PST 型的软起动器。

有了ABB 软起动器，就可以顺畅地起动和停止，最大程度地减少机械上和电气上的冲击。

ABB软启动器的型号、选用说明以及功能一、三大系列。

普通型PSS智能型（带微处理器，不带内置旁路接触器）PST智能型（带微处理器，带内置旁路接触器）PSTB二、两种电压规格软启动器主回路电压，以PSS型为例，样本上红色标记的，主回路230-500V,对应的型号是-500系列；主回路400-690V,对应的型号是-690V系列。

通常我们国家的工业电压是380V,所以应该选-500系列。

-690V贵很多。

电机额定电压，有400V,500V,690V三种规格，通常我们国家是400V三、平时我们经常说额定功率，其实实际上是用额定电流来选型，样本上列出的是标准电机额定功率对应的额定电流。

四、内接还是外接内接可以降低一个容量来选用软启动器，或说可以启动高一个容量的电机。

以PSS18/30-500的软启动器为例，外接是18A的额定电流，对应的是7.5W的标准电机；内接是30A的额定电流，对应的是15W的标准电机。

五、软启动器的功能为了适应现代化生产，为减少对电网的冲击。

对机械的磨损。

减少对启动装置的维护。

可调启动电流。

可校调启动转矩。

可软停车的软启动器被广泛应用于鼠龙型电动机的启动，现以ABB公司软启动器为例：详细介绍其功能及特性。

ABB公司软启动器有以下规格型号：PSS03—25—500L两相控制适用于小型电机的紧凑设计。

这种小型软启动器具有内置的旁路触点。

可长期带负载运行。

PSSI8／30一PSS142／245适用于普通性负载。

同一装置可用“外接”和“内接”两种连接方法(图二)。

采用内接可减少42％流经软启动器的电流。

也就说使用户有可能用58A的软启动器来控制和运行IOOA的电机。

限流功能为可选件。

因此其启动特性有两种设定：1)无限定启动电流时：可设定启动时间(O一3os)，启动电压(3O％一70％Ue)其起动曲线见图三。

2)有限定启动电流：需外接数个电流互感器(变化为／1)，可设定启动时间，启动电流倍数。

供应ABB软启动器参数设置方法软启动器应用特点及选型软启动器工作原理软启动器采用三相反并联晶闸管作为调压器，将其接入电源和电动机定子之间.这种电路如三相全控桥式整流电路,主电路图见图1。

使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上,实现平滑启动，降低启动电流,避免启动过流跳闸.待电机达到额定转数时，启动过程结束，软启动器自动用旁路接触器取代已完成任务的晶闸管，为电动机正常运转提供额定电压,以降低晶闸管的热损耗，延长软启动器的使用寿命,提高其工作效率，又使电网避免了谐波污染。

软启动器同时还提供软停车功能,软停车与软启动过程相反,电压逐渐降低，转数逐渐下降到零，避免自由停车引起的转矩冲击软启动器的选用（1）选型:目前市场上常见的软启动器有旁路型、无旁路型、节能型等.根据负载性质选择不同型号的软启动器。

旁路型：在电动机达到额定转数时，用旁路接触器取代已完成任务的软启动器,降低晶闸管的热损耗，提高其工作效率。

也可以用一台软启动器去启动多台电动机. 无旁路型:晶闸管处于全导通状态,电动机工作于全压方式,忽略电压谐波分量，经常用于短时重复工作的电动机. 节能型:当电动机负荷较轻时，软启动器自动降低施加于电动机定子上的电压，减少电动机电流励磁分量，提高电动机功率因数。

（2）选规格：根据电动机的标称功率，电流负载性质选择启动器，一般软启动器容量稍大于电动机工作电流，还应考虑保护功能是否完备，例如：缺相保护、短路保护、过载保护、逆序保护、过压保护、欠压保护等。

3 Alt48软启动器的特点 Alt48软启动器启动时采用专利技术的转矩控制.转矩斜坡上升更快速，损耗更低。

具有电动机和软启动器综合保护功能,能全时连续检测电机电流,提供电机可靠和完整保护，这种保护功能在启动结束旁路后仍能起作用，这是其它软启动器都不具备的. Alt48在保持加速力矩的同时，实时计算定子和转子的功率。

2/16低压产品简明选用手册工业连接器接线端子装置按钮指示断路器空气用接触器切换电容器接触器建筑用中间继电器软起动器继电器插拔式接口监视继电器电子测量和转换器模拟信号继电器电子时间起动器电动机断路器塑壳接触器通用型继电器热过载开关电源继电器电子过载软起动器 - PST / PSTB型号说明及型号速查表型号速查表，具有更强的抗腐蚀性气体的能力，适合在污水处理、化工、造纸等行业应用PSTB ：智能型系列（带内置旁路接触器）2/17低压产品简明选用手册断路器空气用接触器切换电容器接触器建筑用中间继电器软起动器继电器插拔式接口监视继电器电子测量和转换器模拟信号继电器电子时间起动器电动机断路器塑壳接触器通用型继电器热过载开关电源继电器电子过载工业连接器接线端子装置按钮指示软起动器 - PST / PSTB配合选型表塑壳断路器若只使用塑壳断路器，则可达到类型1的要求。

（类型1：要求接触器和软起动器在短路条件下，不应对人及设备引起危害，在未修复和更换零件前，不允许继续使用。

）快速熔断器保护如要达到类型2要求，需使用快速熔断器。

（类型2：要求接触器和软起动器在短路条件下，不应对人及设备引起危害，且能够继续使用，允许触头熔焊，但制造厂应指明关于设备维修所采用的方法。

）隔离开关熔断器组用于所推荐的快速熔断器。

主回路接触器非必选元件，一般用于过载跳闸。

热过载继电器一般用于保护电动机。

电流互感器全系列已内置电流互感器。

旁路接触器使用旁路接触器，可减少软起动器功耗，同时也可增加每小时的起动次数。

所有软起动器可不带旁路接触器也能正常运行。

2/18低压产品简明选用手册断路器空气用接触器切换电容器接触器建筑用中间继电器软起动器继电器插拔式接口监视继电器电子测量和转换器模拟信号继电器电子时间起动器电动机断路器塑壳接触器通用型继电器热过载开关电源继电器电子过载工业连接器接线端子装置按钮指示PSTB570PSTB7201) 无开关熔断丝，可使用熔断丝支座。