Siemens SINAMICS S120 Function Manual page 214

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Vector control

6.2 Vector control without encoder (SLVC)

As a consequence, the "Passive load" function is automatically activated.

If p0500 is parameterized when commissioning the motor, the calculation is carried out

automatically via p0340 and p3900. p0578is is then set automatically.

Closed-loop control without changeover between closed-loop and open-loop speed control is

restricted to applications with passive load:

A passive load only has a reactive effect on the drive torque of the driving motor at the starting

point, e.g. high inertia masses, pumps, fans, centrifuges, extruders, travel drives, or horizontal

Standstill without a holding current is possible for as long as required. Then, at standstill, only

the magnetizing current is impressed in the motor.

Generator operation

Steady-state generator operation at frequencies close to 0 Hz is not permissible in this

operating mode.

Vector control without an encoder

Blocking drives

If the load torque is higher than the torque limiting of the encoderless closed-loop vector control,

the drive is braked to zero speed (standstill). In order that the open-loop controlled mode is not

selected after the time p1758, p1750.6 can be set to 1. Under certain circumstances the "Motor

blocked delay time" (p2177) must be increased.

Exception for reversing drives

It is not permissible to use this setting if the load can force the drive to reverse.

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

Drive functions