9 Accessory devices9.11 Motor Choke DX-LM3…150 DE1… Variable Speed Starter 11/16 MN040011EN www.eaton.com9.11 Motor Choke DX-LM3…It is recommended to use a motor choke if using long cable lengths and/orconnecting several motors in parallel. The motor choke needs to be placed atthe DE1... variable speed starter’s output. Its rated operational current mustalways be equal to or greater than the variable speed starter’s rated opera-tional current.Figure 91: Motor Choke DX-LM3…Advantages of using a motor choke• Limits the dV/dt value• Reduces voltage peaks• Reduces bearing currents• Improves motor characteristics (insulation, bearings)Motor cable lengths if no motor chokes are used• unscreened: 125 m• screened: 65 m (+ approx. 50 % with motor choke, max. 150 m)It is also recommended to use a motor choke at the DE1... variable speedstarter’s output if several motors with identical or different rated operationaldata are being run in parallel. In this case, the motor choke will compensatefor the total resistance and total inductance decreases caused by the parallel-ing link and will attenuate the cables’ higher stray capacitance.￫ Take into account the maximum permissible motor cablelengths specified in IEC/EN 61800-3 for the relevant EMC inter-ference category (C1, C2, C3 in first and second environments).Further information and technical data on the motorchokes of the DX-LM3… series is provided in instructionleaflet IL00906003Z.a
