Speed Detection Filter And Torque Detection Filter; Stabilizing Speed Detection; Stabilizing Torque Detection; Employing Multiple Primary Delay Filters - Mitsubishi FR-A800 Instruction Manual

Real sensorless vector control, vector control, PM sensorless vector control adjustment
5.6
Real sensorless vector control, vector
control, PM sensorless vector control
adjustment
Purpose
To stabilize speed and torque
feedback signal.
To changes excitation ratio
5.6.1
Speed detection filter and torque detection
filter
Set the time constant of primary delay filter for speed feedback signal and torque feedback signal.
Speed loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
Pr. Name
823
Speed detection filter 1
G215

827
Torque detection filter 1
G216
833
Speed detection filter 2
G315

837
Torque detection filter 2
G316

These parameters are available when FR-A8AP (option) is installed.
Stabilizing speed detection (Pr.823, Pr.833)
• Speed loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
If there is speed ripple due to high frequency disturbance, adjust until speed stabilizes by gradually raising the setting.
Speed is oppositely destabilized if the setting value is too large.
• This setting is valid under vector control only.
Stabilizing torque detection (Pr.827, Pr.837)
• Current loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
If there is torque ripple due to high frequency disturbance, adjust until speed stabilizes by gradually raising the setting.
Speed is oppositely destabilized if the setting value is too large.
Employing multiple primary delay filters
• Use Pr.833, Pr.837 if changing filter according to application. Pr.833, Pr.837: Second function selection (RT) signal
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to
• The RT signal is assigned to the terminal RT in the initial setting. Set "3" in any of Pr.178 to Pr.189 (input terminal function
selection) to assign the RT signal to another terminal.
254
PARAMETERS
Speed detection filter
Torque detection filter
Excitation ratio
Sensorless Vector Sensorless Sensorless Vector Vector PM PM PM
Initial
value
0
0.001 s
0.001 to 0.1 s
0
0 s
0.001 to 0.1 s
0 to 0.1 s
9999
9999
0 to 0.1 s
9999
9999
Parameter to set
P.G215, P.G216,
P.G315, P.G316
P.G217
Setting
range
Without filter
Set the time constant of primary delay filter for speed
feedback signal.
Without filter
Set the time constant of primary delay filter torque
feedback signal.
Second function of Pr.823 (enabled when RT signal ON)
Same as Pr.823 setting
Second function of Pr.827 (enabled when RT signal ON)
Same as Pr.827 setting
Refer
to page
Pr.823, Pr.827,
254
Pr.833, Pr.837
Pr.854 255
Description
page 434.)