Voltage Boost - Siemens Sinamics S120 Function Manual

U/f control (vector control)

5.1 Voltage boost

Function diagram
● FP 6300 U/f characteristic and voltage boost
Parameter
● p1300[0...n] Open-loop/closed-loop control operating mode
5.1 Voltage boost
According to the U/f characteristic, at an output frequency of 0 Hz, the control supplies an
output voltage of 0 V. This means that at 0 V, the motor cannot generate any torque. The
voltage booster function is used to
● magnetize an induction motors at n = 0 rpm,
● establish a torque at n = 0 rpm, e.g. in order to hold a load,
● generate a breakaway, acceleration or braking torque,
● to compensate for resistive losses in the windings and feeder cables.
Three types of voltage boost can be selected:
1. Permanent voltage boost with p1310
2. Voltage boost only while accelerating with p1311
3. Voltage boost only while starting for the first time with p1312
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Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions