Voltage Boost - Siemens SINAMICS S120 Function Manual

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V/f control (vector control)

6.2 Voltage boost

Voltage boost

According to the V/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. There

are several reasons for the use of the "Voltage boost" function:

● Magnetization build-up of an induction motor at n = 0 rpm

● Build-up of a torque at n = 0 rpm, e.g. in order to hold a load

● Generation of a breakaway, acceleration or braking torque

● Compensation of ohmic losses in the windings and feeder cables

Types of voltage boost

Three types of voltage boost can be selected:

● Permanent voltage boost with p1310

● Voltage boost only while accelerating with p1311

● Voltage boost only while starting for the first time with p1312

Voltage boost total

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

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