Lenze i550

10.3 Sensorless vector control (SLVC)
Sensorless (eld-oriented) vector control for asynchronous motors is based on a decoupled
control for the torque-producing and the eld-producing current component. In addion, the
actual speed is reconstructed by means of a motor model so that a speed sensor is not
required.
Precondions
•
Sensorless vector control (SLVC) is only suitable for asynchronous motors.
•
Mul-motor operaon is not permied for sensorless vector control (SLVC).
CAUTION!
Do not operate with hoisng units!
Operaon of the sensorless vector control (SLVC) is not permissible for hoists!
▶
Do not operate the vector control with hoisng units.
Supported operang modes 0x6060 (P301.00):
•
"MS: Velocity mode [-2]"
•
"MS: Torque mode [-1]"
•
"CiA: Velocity mode [2]"
Details
Compared to the V/f characteriscs, the sensorless vector control (SLVC) serves to achieve
improved drive characteriscs thanks to:
•
higher torque throughout the enre speed range
•
higher speed accuracy and higher concentricity factor
•
higher eciency
Speed
Torque
Rated speed
Rated torque
①
Sensorless vector control (SLVC)
②
V/f characterisc control for asynchronous motor (VFC open loop)^ 176
10.3.1 Required commissioning steps
1.
Acvate motor control type: 0x2C00 (P300.00) = "Sensorless vector control (SLVC) [4]".
2.
Carry out opmisaon of the control circuits.
•
An opmum operaon of this motor control type requires an opmisaon of the
control loops!
•
Details: 4Opons for opmising the control loops ^ 213
3.
Oponally for a speed control with torque limitaon in operang mode 0x6060 (P301.00)
= "MS: Velocity mode [-2]":
•
Select the source in 0x2949:001 (P337.01) for the posive torque limit source and set it
accordingly.
•
Select the source in 0x2949:002 (P337.02) for the negave torque limit source and set
it accordingly.
4.
Alternavely, the inverter can be congured in this motor control type in such a way that it
controls a motor torque within a dened frequency range. For details, see chapter "Cong-
uring the torque control". ^ 149
Conguring the motor control
Sensorless vector control (SLVC)
Required commissioning steps
174