Mitsubishi FR-A740-00023-EC, Instruction Manual

Page: 146 / 474

136
Adjustment of real sensorless vector
control, vector control
4.7 Adjustment of real sensorless vector control, vector control
4.7.1 Speed detection filter and torque detection filter (Pr. 823, Pr. 827, Pr. 833, Pr.
837)
(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.
Purpose Parameter that should be Set Refer to Page
Stabilize speed and feedback signal
Speed detection filter
Torque detection filter
Pr. 823, Pr. 827, Pr. 833, Pr. 837 136
Change the excitation ratio Excitation ratio Pr. 854 137
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
Number
Name Initial Value Setting Range Description
823
*1
Speed detection filter 1 0.001s
0 Without filter
0.001 to 0.1s
Set the time constant of the primary delay filter
relative to the speed feedback signal.
827 Torque detection filter 1 0s
0 Without filter
0.001 to 0.1s
Set the time constant of the primary delay filter
relative to the torque feedback signal.
833
*1
Speed detection filter 2 9999
0 to 0.1s
Second function of Pr. 823 (valid when RT signal is
on)
9999 Same as the Pr. 823 setting
837 Torque detection filter 2 9999
0 to 0.1s
Second function of
Pr. 827
(valid when RT signal is
on)
9999 Same as the Pr. 827 setting
*1 This parameter can be set when the FR-A7AP (option) is mounted.
REMARKS
⋅
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 226.)
⋅
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.
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless
Vector Vector Vector