Notch Filter - Mitsubishi Electric FR-A800 Series Instruction Manual

NOTE
• The deceleration check is enabled in the speed control of the Vector control.
• If the protective function (E.OSD) operates due to deceleration check, check whether the Pr.369 Number of encoder pulses
setting is correct.
Parameters referred to
Pr.285 Overspeed detection
Pr.369 Number of encoder pulses, Pr.851 Control terminal option-Number of encoder

5.3.10 Notch filter

Sensorless Vector Vector Vector
Sensorless Sensorless
The response level of speed control in the resonance frequency band of mechanical systems can be lowered to avoid
mechanical resonance.
Pr.
1003
Notch filter frequency
G601
1004
Notch filter depth
G602
1005
Notch filter width
G603
 Pr.1003 Notch filter frequency
• This sets the frequency for the center when attenuating the gain. If the mechanical resonance frequency is unknown, lower
the notch frequency in order from the highest. The point where the resonance is smallest is the optimum setting for the
notch frequency.
 Pr.1004 Notch filter depth
• A deeper notch depth has a greater effect in reducing mechanical resonance, but because the phase delay is larger,
swinging may increase. Adjust by starting from the shallowest value.
Setting
Gain -4 dB
(depth) (Shallow)
 Pr.1005 Notch filter width
• This sets the width of the frequency to which to apply the notch filter. The setting can be adjusted according to the width
of the frequency range to be excluded.
• If the width is too wide, the response level of speed control will drop, and the system may become unstable.
NOTE
• If a value higher than 500 Hz is set in Pr.1003 while the response speed is normal (Pr.800 = any of "0 to 5 and 9 to 14"), the
inverter operates at 500 Hz.
Parameters referred to
Pr.800 Control method
Downloaded from ManualsNet.com
frequencypage 736
PM PM PM
Initial
Name
value
0
0
0
Gain
0dB
Pr.1004
Notch filter depth
3 2 1
-8 dB -14dB
selectionpage 221
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
search engine
pulsespage 94
Setting range
0 No notch filter
8 to 1250 Hz Set the frequency for the center of gain attenuation.
0 to 3 0 (Deep) → 3 (Shallow)
0 to 3 0 (Narrow) → 3 (Wide)
Pr.1003
Notch filter frequency
Pr.1005
Notch filter width
0
-40 dB
(Deep)
Description
Frequency
1
2
3
4
5
6
7
8
9
10
271
5. PARAMETERS