Pm Sensorless Vector Control Adjustment - Mitsubishi Electric FR-A820-00046 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.
823
G215
827
G216
833
G315
837
G316
These parameters are available when a vector control compatible 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
NOTES The RT signal is a second function selection signal. The RT signal also enables other second func-
tions. (Refer to page 5-428.)
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.
5 - 186
Parameter to set
Speed detection filter
Torque detection filter
Excitation ratio
Name
Speed detection filter 1
Torque detection filter 1
Speed detection filter 2
Torque detection filter 2
P.G215, P.G216,
P.G315, P.G316
P.G217
Initial Setting
Description
value range
0 Without filter
0.001 s
Set the time constant of primary delay filter for speed
0.001 to 0.1 s
feedback signal.
0 Without filter
0 s
Set the time constant of primary delay filter torque
0.001 to 0.1 s
feedback signal.
Second function of Pr. 823 (enabled when RT signal
0 to 0.1 s
ON)
9999
9999 Same as Pr. 823 setting
Second function of Pr. 827 (enabled when RT signal
0 to 0.1 s
ON)
9999
9999 Same as Pr. 827 setting
Parameters
Pr. 823, Pr. 827, Pr.
833, Pr. 837
Pr. 854
Sensorless Vector Sensorless Sensorless Vector Vector PM PM PM
Refer
to
page
5-186
5-187