V/f control (vector control)
6.2 Voltage boost
Drive functions
302 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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
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 Voltage boost total
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