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Operation
8.5 Functions
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
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
● In comparison with speed control without an encoder, the dynamic response of drives with
Function diagrams
● 1590
● 1610
● 6010
● 6030
● 6040
● 6050
● 6060
● 6490
142
(p0310) must be maintained.
speed to be maintained.
an encoder is significantly increased. The reason is that the speed is measured directly and
used for the model formation of the current components.
SINAMICS GM150 6SL3810-2LN31-8AA2
Operating Instructions Rev.201910281332 EXAMPLE
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