Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 179
8400 StateLine C | Reference manual
Motor control (MCTRL)
Sensorless control for synchronous motors (SLPSM)
5.8.2 Types of control
Sensorless control for synchronous motors can only be executed in the "Speed control with
torque limitation" (bTorquemodeOn =FALSE) mode.
Speed control with torque limitation
A speed setpoint is selected and the drive system is operated in a speed-controlled manner.
For adapting the operational performance, the overload in the drive train can be limited:
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:
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
.
Stop!
Torque limitation is only active in the closed-loop controlled operation
(|n
Setpoint
| > n
C00996
)!
• It must be prevented that the actual speed value is braked into the non-
observable area due to the torque limitation!
Note!
To avoid instabilities during operation, the torque limit values are internally
processed as absolute values.
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