Mitsubishi Electric FR-E800 Series Instruction Manual page 155

7
Adjustment during Real sensorless vector
control, Vector control, PM sensorless vector
control
Purpose
To stabilize speed feedback signal
To change excitation ratio
7.1
Speed detection filter
Vector Vector Vector
Set the time constant of primary delay filter for speed feedback signal.
Speed loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
Pr.
823
Speed detection filter 1
*1
G215
833
Speed detection filter 2
*1
G315
*1 The setting is 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.
 Employing multiple primary delay filters
• Use Pr.833 if changing filter according to application. Pr.833 is enabled when the Second function selection (RT) signal is
turned ON.
NOTE
• The RT signal is the 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 status. Set "3" in one of Pr.178 to Pr.189 (Input terminal function
selection) to assign the RT signal to another terminal.
154
7. Adjustment during Real sensorless vector control, Vector control, PM sensorless vector control
7.1 Speed detection filter
Speed detection filter
Excitation ratio
Name Initial value
0.001 s
9999
Parameter to set
P.G215, P.G315
P.G217
Setting range
0 Without filter
Set the time constant of primary delay filter for speed
0.001 to 0.01 s
feedback signal.
Second function of Pr.823 (enabled when the RT
0 to 0.01 s
signal is ON)
9999 Same as Pr.823 setting
Pr.823, Pr.833
Pr.854
Description
Refer to
page
154
155
page 334.)