Adjustment Of Real Sensorless Vector Control, Vector Control; Speed Detection Filter And Torque Detection Filter (Pr. 823, Pr. 827, Pr. 833, Pr. 837) - Mitsubishi Electric FR-A760 Series Instruction Manual

Adjustment of real sensorless vector
control, vector control

4.7 Adjustment of real sensorless vector control, vector control

Purpose
Stabilize speed and feedback signal
Change the excitation ratio
4.7.1 Speed detection filter and torque detection filter (Pr. 823, Pr. 827, Pr. 833, Pr.
837)
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless
Set the time constant of the primary delay filter relative to the speed feedback signal and torque feedback signal.
Since this function reduces the speed loop response, use it with the initial value.
Parameter
Name
Number
823 Speed detection filter 1
*1
827 Torque detection filter 1
833 Speed detection filter 2
*1
837 Torque detection filter 2
*1 This parameter can be set when the FR-A7AP (option) is mounted.
(1) Stabilize speed detection (Pr. 823, Pr. 833 )
⋅ Since the current loop response reduces, use it with the initial value.
Increase the setting value gradually and adjust the value to stabilize the speed when speed ripples occur due to
harmonic disturbance, etc. A too large value will run the motor unstably.
⋅ Pr. 823 and Pr. 833 are valid only during vector control
(2) Stabilize speed detection (Pr. 827, Pr. 837 )
⋅ Since the current loop response reduces, use it with the initial value.
Increase the setting value gradually and adjust the value to stabilize the speed when torque ripples occur due to
harmonic disturbance, etc. A too large value will run the motor unstably.
(3) Use multiple primary delay filters.
⋅ Use Pr. 833 and Pr. 837 to change the filter accroding to applications. Pr. 833 and Pr. 837 are valid when the RT
signal is on.
REMARKS
⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 221.)
⋅ The RT signal is assigned to the RT terminal in the initial setting. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal function
selection) , you can assign the RT signal to the other terminal.
130
Parameter that should be Set
Speed detection filter
Torque detection filter
Excitation ratio
Vector Vector Vector
Initial Value Setting Range
0.001s
0s
9999
9999
Pr. 823, Pr. 827, Pr. 833, Pr. 837
Pr. 854
0 Without filter
Set the time constant of the primary delay filter
0.001 to 0.1s
relative to the speed feedback signal.
0 Without filter
Set the time constant of the primary delay filter
0.001 to 0.1s
relative to the torque feedback signal.
Second function of Pr. 823 (valid when RT signal is
0 to 0.1s
on)
9999 Same as the Pr. 823 setting
Second function of Pr. 827 (valid when RT signal is
0 to 0.1s
on)
9999 Same as the Pr. 827 setting
Refer to Page
130
131
Description