Notch Filter - Mitsubishi Electric 800 Series Instruction Manual

Speed control under Real sensorless vector control, vector control, PM sensorless vector
5.3.10

Notch filter

The response level of speed control in the resonance frequency band of mechanical systems can be lowered to avoid
mechanical resonance.
Pr. Name
1003
Notch filter frequency
G601
1004
Notch filter depth
G602
1005
Notch filter width
G603
Pr.1004
Notch filter depth
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,
vibration may increase. Adjust by starting from the shallowest value.
Setting 3 2

Depth Shallow
Gain -4dB -8dB
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 selection
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Sensorless Sensorless Sensorless Vector Vector
Initial Setting
value range
0
0
8 to 1250 Hz
0 0 to 3
0 0 to 3
Gain
Notch filter frequency
0dB
1 0

Deep
-14dB -40dB
page 137
PM PM PM
No notch filter
Set the frequency for the center of gain attenuation.
0 (Deep)  3 (Shallow)
0 (Narrow) 3 (Wide)
Pr.1003
Pr.1005
Notch filter width
control
Description
Frequency
PARAMETERS
5
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