Lenze 8400 TopLine - Manual (Page 196)

5 Motor control (MCTRL)
5.7 Sensorless vector control (SLVC)
196
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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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 C2865/1 via bit 12 and bit 13.
Identifier
DIS code | data type
Information/possible settings
nTorqueMotLimit_a
C00830/29 | INT
Torque limitation in motor mode
• Scaling: 16384 ≡ 100 % M
max
( C00057 )
• Setting range: 0 … +199.99 %
• If keypad control is performed: Parameterisable via C00728/1 .
nTorqueGenLimit_a
C00830/28 | INT
Torque limitation in generator mode
• Scaling: 16384 ≡ 100 % M
max
( C00057 )
• Setting range: -199.99 ... 0 %
• If keypad control is performed: Parameterisable via C00728/2 .

Note!
To avoid instabilities during operation, the torque limit values are internally processed
as absolute values.