Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 163
8400 StateLine C | Reference manual
Motor control (MCTRL)
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
A speed setpoint is selected and the drive system is operated in a speed-controlled manner.
The operational performance can be adapted in the following ways:
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:
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
).
– Here, the total current injected into the motor does not exceed the max. currents in
motor and generator mode.
Slip compensation
( 207)
– Using a slip model, the slip of the machine is reconstructed.
– The slip compensation (C00021
) acts as the influencing parameter.
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.
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