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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
195
5
Motor control (MCTRL)
5.7
Sensorless vector control (SLVC)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.7.2
Types of control
The sensorless vector control can be operated in two different modes:
•
Speed control with torque limitation
(
bTorquemodeOn
= FALSE)
•
Torque control with speed limitation
(
bTorquemodeOn
= TRUE)
5.7.2.1
Speed control with torque limitation
When
bTorquemodeOn
= FALSE, the drive system is operated with a selected speed setpoint in a
speed-controlled manner.
The operational performance can be adapted in the following ways:
A. Overload limitation in the drive train
B. Motor current limitation
C. Slip compensation
Overload limitation in the drive train
The torque is limited via the torque setpoint.
• The torque setpoint is identical to the value at the output of the speed controller,
nOutputSpeedCtrl
.
• To avoid overload in the drive train, the torque in motor mode can be limited via the
nTorqueMotLimit_a
process input signal, and the torque in generator mode can be limited via
the
nTorqueGenLimit_a
process input signal:
Note!
From version 13.00.00
, the torque setpoint
nSpeedSetValue_a
is set to 0 by quick stop
(QSP) device-internally and the torque limit values
nTorqueMotLimit_a
and
nTorqueGenLimit_a
are set to 100 % to stop the drive quickly and safely anytime. The
previous behaviour can be set in
Designator
DIS code | data type
Information/possible settings
nTorqueMotLimit_a
| INT
Torque limitation in motor mode
• Scaling: 16384
≡
100 % M
max
(
)
• Setting range: 0 … +199.99 %
• If keypad control is performed: Parameterisable via
nTorqueGenLimit_a
| INT
Torque limitation in generator mode
• Scaling: 16384
≡
100 % M
max
(
)
• Setting range: -199.99 ... 0 %
• If keypad control is performed: Parameterisable via
Note!
To avoid instabilities during operation, the torque limit values are internally processed
as absolute values.