Mitsubishi Electric 800 Series Instruction Manual page 179

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
Torque bias operation (Pr.844, Pr.845)
• The torque start-up can be made slower by setting Pr.844 Torque bias filter ≠ "9999". The torque start-up operation at this
time is the time constant of the primary delay filter.
• Set the time for continuing the output torque simply by using the command value for the torque bias in Pr.845 Torque bias
operation time.
Speed
Torque bias
Torque bias filter
primary delay time
constant
Output torque
Time when torque is
generated by
torque bias setting
∗1
Pre-excitation LX
Start signal

When pre-excitation is not performed, the torque bias functions at the same time as the start signal.
NOTE
• When torque bias is enabled and Pr.868 ="6", terminal 1 operates as a torque command instead of a frequency setting
auxiliary. When override compensation is selected using Pr.73 Analog input selection and terminal 1 is the main speed, no
main speed (main speed=(0Hz) is set.
• The torque bias is valid for the first motor. When applying the second motor (RT signal is ON), the torque bias function is not
performed.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to ???????
Pr.73 Analog input selection
Pr.178 to Pr.189 (Input terminal function selection)
Pr.919, Pr.920 (torque setting voltage (current) bias/gain)
178
PARAMETERS
Pr. 844
Pr. 845
page 393
page 415
page 407