Efficient Networks S120 Band-stop with defined notch depth, Band-stop with defined reduction

Servo control 3.7 Current setpoint filter

Band-stop with defined notch depth

Table 3-4 Example of band-stop with defined notch depth

STARTER filter parameters	Amplitude log frequency curve
Blocking frequency fSp = 500 Hz
Bandwidth fBB = 500 Hz
Notch depth K = -20 dB
Reduction Abs = 0 dB
		. G%

Phase frequency curve

Simplified conversion to parameters for general order filters: No reduction or increase after the blocking frequency Defined notch at the blocking frequency K[dB] (e.g. -20 dB) ● Numerator frequency fZ = fSp

	I
'=	%%
	.

● Numerator damping		6S
		I  

● Denominator natural frequency fN = fSp

			%%
	'1		I
● Denominator damping			6S
			I

Band-stop with defined reduction

Table 3-5 Example of band-stop

STARTER filter parameters	Amplitude log frequency curve
Blocking frequency fSP = 500 Hz
Bandwidth fBB = 500 Hz
		$EVG%
Notch depth K = -∞ dB
Reduction ABS = -10 dB

Phase frequency curve

General conversion to parameters for general order filters:

● Numerator natural frequency I= = ω= = I6S

2π

		1	⎛		1		⎞2	I 2
	.		⎜				⎟
'= = 10 20 •			• ⎜1	−			⎟ +	%%
						$EV			$EV
		2	⎜				⎟
● Numerator damping			⎝		10 20		⎠	I6S2 • 10 10

Drive Functions	81
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4