Lenze E84DSxxx - Manual (Page 139)

Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
139
5 Motor control (MCTRL)
5.6 Sensorless vector control (SLVC)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.6.2 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)
5.6.2.1 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 ( 160)
• 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.