Types Of Control - Lenze 8400 StateLine C Reference Manual

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
nTorqueMotLimit_a
nTorqueGenLimit_a

Stop!
Torque limitation is only active in the closed-loop controlled operation
(|n
Setpoint
• 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.
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
Information/possible settings
Torque limitation in motor mode
• Scaling: 16384 ≡ 100 % M
C00830/29 | INT
• Setting range: 0 ... +199.99 %
• If keypad control is performed: Parameterisable via C00728/1.
Torque limitation in generator mode
• Scaling: 16384 ≡ 100 % M
C00830/28 | INT
• Setting range: -199.99 ... 0 %
• If keypad control is performed: Parameterisable via C00728/2.
| > n )!
C00996
L
8400 StateLine C | Reference manual
Sensorless control for synchronous motors (SLPSM)
(C00057)
max
(C00057)
max
Motor control (MCTRL)
179