Solution Softstarter

Solution:

1.   From table: VStart = 40%, TRamp = 20 s

2.   Pmech = T * n / 9550   =>  TN = Pmech * 9550 / nN  =  15 kW * 9550 / 1435 min-1  = 99,83 Nm

3.   T proportional to V2 => without Softstarter:  TStart = 2,8 * TN = 2,8 * 99,83 Nm  = 279,524 Nm

=>    With Softstarter: TStart Softst. = 0,42 * TStart = 0,16 * 279,524 Nm = 44,724 Nm  > 40 Nm

=>  breakaway is possible

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