Vector Control - Siemens Sinamics S120 Function Manual

Vector control

Compared with vector V/f control, vector control offers the following benefits:
● Stability vis-à-vis load and setpoint changes
● Short rise times for setpoint changes (→ better control behavior)
● Short settling times for load changes (→ better response to disturbances)
● Acceleration and braking are possible with maximum available torque
● Motor protection due to variable torque limitation in motor and regenerative mode
● Drive and braking torque controlled independently of the speed
● Maximum breakaway torque possible at speed 0
Vector control can be used with or without an encoder.
The following criteria indicate when an encoder is required:
● High speed accuracy is required
● High dynamic response requirements
● Torque control is required in a control range greater than 1:10
● Allows a defined and/or variable torque for speeds below approx. 10% of the rated motor
With regard to setpoint input, vector control is divided into:
● Speed control
● Torque/current control (in short: torque control)
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
– Better command behavior
– Better disturbance characteristic
frequency (p0310) to be maintained.
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