Reference Model - Siemens SINAMICS G150 Operating Instructions Manual

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Setpoint channel and closed-loop control

7.4 Vector speed/torque control with/without encoder

The ramp-up and ramp-down times should always be set to values larger than the startup

Setting the ramp-function generator

The ramp-up and ramp-down times (p1120; p1121) of the ramp-function generator in the

setpoint channel should be set accordingly so that the motor speed can track the setpoint

during acceleration and braking. This will optimize the function of speed controller pre-

Acceleration pre-control using a connector input (p1495) is activated by the parameter

settings p1400.2 = 1 and p1400.3 = 0. p1428 (dead time) and p1429 (time constant) can be

set for balancing purposes.

Function diagram

Reference model

The reference model is activated with p1400.3 = 1.

The reference model is used to emulate the speed control loop with a P speed controller.

The loop emulation can be set in p1433 to p1435. It becomes effective if p1437 is connected

to the output of the model r1436.

Precontrol balancing reference/acceleration model

Rated motor speed

Rated motor torque

Motor moment of inertia

Ratio between the total and motor moment of inertia

Rated motor startup time

Acceleration pre-control source

Speed pre-control balancing dead time

Speed pre-control balancing time constant

Acceleration pre-control scaling

Acceleration torque

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Operating Instructions, 07/2016, A5E03347396A

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