Voltage Precontrol; Configuring The Voltage Precontrol - Siemens SINAMICS S120 Function Manual

Servo control

4.21 Voltage precontrol

4.21 Voltage precontrol
4.21.1

Configuring the voltage precontrol

Using voltage precontrol (p1703), the dynamic response of the q current controller can be
increased independent of the controller setting - all the way up to the limit that is physically
possible. This means that the current setpoint is established as quickly as possible. Together
with the speed-torque precontrol (p1402.4 = 1, p1517 = 0 ms, p1428, p1429), the bandwidth
of the speed controller dynamic response can be increased.
Especially for synchronous motors, the motor q-inductance (p0356) changes significantly
with the torque-generating current. This response must be taken into account for the
precontrol model.
Configuring the voltage precontrol step-by-step with simple diagrams is subsequently
described.
Step 1: Setting the adaptation characteristic
1. Determine the q-inductance characteristic using a rotating measurement (p1959.5, p1960
and r1934, r1935).
2. Correct the parameters of the adaptation characteristic (p0356, p0391, p0392, p0393)
with the objective of achieving the smallest possible deviation between the measured and
parameterized characteristic.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions