Lenze 8400 - Torque Control with Speed Limitation

5 Motor control (MCTRL)
5.7 Sensorless vector control (SLVC)
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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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Motor current limitation
A cross current setpoint is calculated from the torque setpoint which is limited depending on the
magnetising current, the max. current in motor mode (C00022
) and the max. current in generator
mode (C00023
). The total current injected into the motor does not exceed the max. currents in
motor mode and in generator mode.
Slip compensation
The slip of the machine is reconstructed using the slip model. An influencing parameter is the slip
constant (C00021
). Slip compensation ( 271)
5.7.2.2 Torque control with speed limitation
When bTorquemodeOn = TRUE, a torque-controlled operation is activated. The setpoint torque
directly follows the default value nTorqueSetValue_a.
Due to its speed limitation, the torque-controlled drive can only rotate within a speed range whose
positive speed is limited by nSpeedHighLimit_a and whose negative speed is limited by
nSpeedLowLimit_a.
• From version 13.00.00, the bLimSpeedTorquemodeOn status signal is used to show that the
speed limitation is active.
• The speed is defined by the process.
• The torque setpoint is calculated directly from nTorqueSetValue_a.
• From version 12.00.00 onwards, the torque limitation is active via nTorqueMotLimit_a and
nTorqueGenLimit_a in this control mode, too, for the torque setpoint to be limited. The
torque limitation can be deactivated in C2865/1
via bit 0 to obtain the previous function.
 Note!
• Absolute speed limitation to speed 0 rpm (nSpeedLowLimit_a or
nSpeedHighLimit_a = 0) is only possible from version 12.00.00.
• Quick stop (QSP) is used to switch over to Speed control with torque limitation
.
• From version 13.00.00, the torque setpoint nSpeedSetValue_a is set to 0 by quick
stop (QSP) device-internally and the two 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.
Designator
DIS code | data type
Information/possible settings
nTorqueSetValue_a
C00830/27 | INT
Torque setpoint / additive torque
• Scaling: 16384 ≡ 100 % M
max
(C00057)
nSpeedHighLimit_a
C00830/88 | INT
Upper speed limit for the speed limitation
• During torque-controlled operation only (bTorquemodeOn = TRUE)
• Scaling: 16384 ≡ 100 % rated speed (C00011
)
nSpeedLowLimit_a
C00830/23 | INT
Lower speed limit for speed limitation
• During torque-controlled operation only (bTorquemodeOn = TRUE)
• Scaling: 16384 ≡ 100 % rated speed (C00011
)