Voltage Boost - Siemens SINAMICS S120 Function Manual

6.1

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
Figure 6-2
Note
The voltage boost affects all V/f characteristics (p1300).
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Voltage boost total
U/f control (vector control)
6.1 Voltage boost
267