This information is part of the Modelica Standard Library maintained by the Modelica Association.

This block models the functionality of a soft starter controller, controlling the output vRef in the range [0,1] with respect to nominal voltage.

Boolean input start = true causes the output vRef to be risen according to a ramp: vRef = vStart + (1 - vStart)*(time - t0)/tRampUp.

In case the current exceeds the specified maximum current iMax during the starting ramp, the ramp is stopped. When the current falls below the lower threshold of current control iMin < iMax, the ramp is continued.

Note: It is recommended to filter the measured current, e.g. using Modelica.Blocks.Continuous.Filter

Boolean input start = false causes the output vRef to be lowered according to a ramp: vRef = -(time - t0)/tRampDown.

tRampUp	Value: Type: Time (s) Description: Start ramp duration
vStart	Value: 0 Type: Real Description: Start voltage / nominal voltage
iMax	Value: Type: Real Description: Maximum current / nominal current
iMin	Value: 0.9 * iMax Type: Real Description: Lower threshold of current control
INominal	Value: Type: Current (A) Description: Nominal current
tRampDown	Value: Type: Time (s) Description: Stop ramp duration