Mitsubishi Electric FR-A800, Instruction Manual

Page: 297 / 1042

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
FR-A800 5 - 117
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".
I001517E
Fig. 5-32: Torque output
NOTES 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 = (0 Hz) 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 => page 5-389
Pr. 178 to Pr. 189 (input terminal function selection) => page 5-422
C16 to C19
(Pr. 919, Pr. 920)
(torque setting voltage (current) bias/gain) => page 5-409
Speed
Torque bias
Pr. 844
Pr. 845
Torque bias filter primary
delay time constant
Output torque
Time when torque is generated by
torque bias setting
Start signal
Pre-excitation LX
When pre-excitation is not performed, the torque bias functions at the same time as the start signal.