Adjustment During Real Sensorless Vector Control, Vector Control, Pm Sensorless Vector Control; Speed Detection Filter And Torque Detection Filter; Excitation Ratio - Mitsubishi Electric FR-A800 Series Instruction Manual

5.6
Adjustment during Real sensorless vector control,
Vector control, PM sensorless vector control
Purpose
To stabilize speed and torque feedback
signal
To change excitation ratio
5.6.1

Speed detection filter and torque detection filter

Sensorless Sensorless Vector Sensorless Vector Vector
Set 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
Speed detection filter 1
*1
G215
827
Torque detection filter 1
G216
833
Speed detection filter 2
*1
G315
837
Torque detection filter 2
G316
*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.
 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 and Pr.837 if changing filter according to application. Pr.833, Pr.837 is enabled when the Second function
selection (RT) signal is turned ON.
NOTE
• The RT signal is a second function selection signal which 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.
5.6.2

Excitation ratio

Sensorless Sensorless Sensorless Vector Vector Vector
The excitation ratio can be lowered to enhance efficiency for light loads. (Motor magnetic noise can be reduced.)
332
5. PARAMETERS

5.6 Adjustment during Real sensorless vector control, Vector control, PM sensorless vector control

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Speed detection filter, torque
detection filter
Excitation ratio
PM PM PM
Name Initial value
0.001 s
0 s
9999
9999
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Parameter to set
P.G215, P.G216,
P.G315, P.G316
P.G217
Setting range
0 Without filter
Set the time constant of primary delay filter for speed
0.001 to 0.1 s
feedback signal.
0 Without filter
Set the time constant of primary delay filter torque
0.001 to 0.1 s
feedback signal.
Second function of Pr.823 (enabled when the RT
0 to 0.1 s
signal is ON)
9999 Same as Pr.823 setting
Second function of Pr.827 (enabled when the RT
0 to 0.1 s
signal is ON)
9999 Same as Pr.827 setting
Pr.823, Pr.827,
Pr.833, Pr.837
Pr.854
Description
page 525.)
Refer to
page
332
332