2 Engineering2.11 Motor connection44 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com2.11.4 Actuation of resistive loadsDS7 soft starters can also be used to drive resistive loads (example: electricalheating elements).Figure 27: Impermissible connection for resistive loadsQ1 = Cable and cableprotectionQ21 = Soft starterQ31 = Motor contactorF3 = optionalsemiconductor fuse fortype of coordination 2,R = Resistive load① Delta circuit② Star connectionFigure 26: Connecting resistive loads in a wye or delta circuit￫ Do not use the soft starters to drive solidly grounded wye circuitresistive loads, as a phase will be connected directly to themains voltage in this case!1L13L25L3PEPETOR- A2 EN + A1 13 14 24232T14T26T3L1L2L3PEQ1Q21① ②F3I > I > I >Q1RUN- U s + U s(+) U s24 V AC/DC, 120/230 V AC(–) U sL1 L3L1 L3L2L2T1 T2 T3
