Emotron VS10 - Torque Control W; Freq. Limit

7.4.4.8. Torque control w/ freq. limit
In general, the inverter is operated in a mode that controls the motor frequency.
Alternatively, the inverter can be configured in such a way that it controls a motor torque
within a defined frequency range.
Typical applications for such a torque control with frequency limitation are winders and
packaging machines.
Preconditions
A torque control is only possible in the motor control type 0x2C00 (P300.00) = "Sensorless
vector control (SLVC) [4]". Thus, first this motor control type must be configured. For
details see chapter "Sensorless vector control (SLVC)".
 115
After configuring the sensorless vector control (SLVC), one of the following optimisations
must be carried out for a torque control as precise as possible:
 Automatic motor identification (energized)  139
 Automatic motor calibration (non-energized)  140
Details
Setpoint selection:
• Instead of a frequency setpoint in [Hz], a torque setpoint has to be defined for the
torque control. This can be either a value in percent with reference to the rated motor
torque set in 0x6076 (P325.00) or a value in [Nm] if defined via network.
• The standard setpoint source for the torque control can be selected in 0x2860:003
(P201.03) (default setting: Analog input 1).
• Corresponding functions make it possible to change over to other setpoint sources
during
operation.Setpoint change-over  378
Limitation of the torque range:
• The positive and negative torque limit can be set independently of each other.
• Frequency limitation / speed limitation:
• The adjustable speed limits serve to protect against very high speeds. High speeds can
occur if a pure torque is selected without a counter torque being available (load-free
machine).
• The torque control controls the assigned torque setpoint within the set speed limits.
The
actual speed results from the load conditions of the application. If the actual speed
reaches the set speed limits, it is kept on the respective limit value. This protective
function is also called "speed limitation".
• The lower and upper speed limit for speed limitation can be set independently of each
other. They can also be defined via analog inputs or network.
In the following, the steps required for configuring the torque control with frequency
limitation are described.