2 Engineering2.4 Power connectionDS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com 352.4 Power connectionThe power section should be protected according to the connection formused.Cable and device protection on the supply side:• Input AC… via standard fuses for cable protection or via motor-protectivecircuit-breaker.• Fuses in UL compliant systems must be UL-approved.• The rated operating voltages of the fuses must be suitable for the localmains voltage.• No fuses are required on the motor side.The following figure shows the basic connection of motor and powersection.Figure 18: Connecting the power section and motorF3 = optional semiconductor fuseQ1 = Cable protection + motor protectionQ21 = Soft starterM1 = MotorAt the output of the soft starter (terminals 2T1, 4T2, 6T3) you must not• Connect any capacitive load (e.g. phase compensation capacitors),• Connect several soft starters in parallel,• Feed a mains voltage or a voltage from a variable frequency drive or othervoltage source.M3 ~1L12L33L51T22T43T6L1L2L3PEQ1Q21F3M1I > I > I >≦ 32 A1L12L33L5EPEP1T22T43T6Q21≧ 41 A
