Siemens SINAMICS GM150, Operating And Installation Instructions, Page: 167 / 258

Benefits of vector control with an encoder
A speed encoder is only required in the following conditions:
● A separately excited motor is used.
● Highest speed accuracy is required.
● The most stringent demands on the dynamic response are required.
● Better command behavior is desired.
● The shortest possible settling times during disturbances are required.
● Torque control in a range greater than 1:10 is required.
● A defined and/or variable torque for speeds below approx. 5% of the rated motor frequency
(p0310) must be maintained.
Open-loop and closed-loop control methods (p1300):
● V/f control with linear characteristic.
● I/f control with fixed current.
● Speed control.
● Torque/current control (in short: torque control).
Vector control with encoder
Benefits of vector control with an encoder:
● The speed can be controlled right down to 0 Hz (standstill).
● Stable control response throughout the entire speed range.
● Allows a defined and/or variable torque for speeds below approx. 10% of the rated motor
speed to be maintained.
● In comparison with speed control without an encoder, the dynamic response of drives with
an encoder is significantly increased. The reason is that the speed is measured directly
and used for the model formation of the current components.
Function diagrams
● 1590
● 1610
● 6010
● 6030
● 6040
● 6050
● 6060
● 6490
Operation
8.4 Functions
SINAMICS GM150 6SL3815-2LN41-4AA2
Operating Instructions 04/2017
167