The acceleration time of a drive with a soft starter results from
the settings of the start voltage (UStart) and the ramp time (tStart)
for the linear increase up to full mains voltage (ULN). The start
voltage determines the breakaway torque of the motor. High
start voltages and short ramp times correspond approximately
to the direct-on-line start. In practice, the required breakaway
torque (UStart) and then the shortest possible ramp time (tStart)
are initially set for the required soft start.