Commissioning via the built-in BOP
5.6 Function commissioning
SINAMICS V20 Converter
90 Operating Instructions, 10/2019, A5E34559884-012
5.6.2.3 Setting the voltage boost
Functionality
For low output frequencies, the V/f characteristics only give a low output voltage. The ohmic
resistances of the stator winding play a role at low frequencies, which are neglected when
determining the motor flux in V/f control. This means that the output voltage can be too low in
order to:
● implement the magnetization of the asynchronous motor
● hold the load
● overcome losses in the system.
The output voltage can be increased (boosted) in the converter using the parameters as
shown in the table below.
P1310 Continuous boost
[%]
This parameter defines boost level relative to P0305 (rated motor current) applicable to
both linear and quadratic V/f curves.
Range: 0.0 to 250.0 (factory default: 50.0)
The voltage boost is effective over the complete frequency range whereby the value
continually decreases at high frequencies.
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