Voltage Precontrol - Siemens SINAMICS S120 Function Manual

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Voltage precontrol

Function description

Using voltage precontrol (p1703), the dynamic response of the q current controller can be

increased independent of the current 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

The individual steps for configuring the voltage feedforward control are described in the

Recommendation

As a result of the higher bandwidth of the current controller, higher frequencies can be excited

- and the phase position changes. As a consequence, after activating the voltage precontrol,

check the speed or position controller and if required - adjusted these as necessary.

Configuring the function

This "Voltage feedforward control" function is configured in the following steps:

Setting the adaptation characteristic

Proceed as follows to determine and set the adaptation characteristic:

1. Determine the q-inductance characteristic using a rotating measurement (p1959.5, p1960

and r1934, r1935).

2. When the identified data are accepted, the parameters of the adaptation characteristic

(p0356, p0391, p0392 and p0393) are appropriately set.

Additionally note the following parameter assignment examples:

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Servo control

5.23 Voltage precontrol