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Changes for page 07 Adjustments

Last modified by Iris on 2025/07/24 11:03
From version 1.1
edited by Leo Wei
on 2022/06/08 12:57
Change comment: Imported from XAR
To version 7.1
edited by Joey
on 2022/06/10 15:29
Change comment: There is no comment for this version

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1 -XWiki.admin
1 +XWiki.Joey
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2 2  
3 3  The servo drive needs to make the motor faithfully operate in accordance with the instructions issued by the upper controller without delay as much as possible. In order to make the motor action closer to the instruction and maximize the mechanical performance, gain adjustment is required. The process of gain adjustment is shown in Figure 7-1.
4 4  
5 -[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_89da9be7ea621ab.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_89da9be7ea621ab.gif"]]
5 +(% style="text-align:center" %)
6 +[[image:image-20220608174118-1.png]]
6 6  
7 7  Figure 7-1 Gain adjustment process
8 8  
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28 28  
29 29  The load inertia ratio is an important parameter of the servo system, and setting of the load inertia ratio correctly helps to quickly complete the debugging. The load inertia ratio could be set manually, and online load inertia recognition could be performed through the host computer debugging software.
30 30  
31 -|[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6db94f5d0421f97a.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6db94f5d0421f97a.png"]]
32 32  |(((
33 +(% style="text-align:center" %)
34 +[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6db94f5d0421f97a.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6db94f5d0421f97a.png"]]
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33 33  **Before performing online load inertia recognition, the following conditions should be met:**
34 34  
35 35  The maximum speed of the motor should be greater than 300rpm;
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180 180  
181 181  The servo system consists of three control loops, from the outside to the inside are the position loop, the speed loop and the current loop. The basic control block diagram is shown as below.
182 182  
183 -[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_121534c3612a37b8.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_121534c3612a37b8.gif"]]
187 +(% style="text-align:center" %)
188 +[[image:image-20220608174209-2.png]]
184 184  
185 185  Figure 7-2 Basic block diagram of servo loop gain
186 186  
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335 335  
336 336  By setting the filter time constant, the torque instruction is attenuated in the high frequency range above the cutoff frequency, so as to achieve the expectation of suppressing mechanical resonance. The cut-off frequency of the torque instruction filter could be calculated by the following formula:
337 337  
343 +[[image:https://docs.we-con.com.cn/bin/download/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/07%20Adjustments/WebHome/40.png?rev=1.1]]
338 338  
339 -[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_b790fca20446a1fb.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_b790fca20446a1fb.gif"]]
340 -
341 341  **(2) Notch filter**
342 342  
343 343  The notch filter can achieve the expectation of suppressing mechanical resonance by reducing the gain at a specific frequency. When setting the notch filter correctly, the vibration can be effectively suppressed. You can try to increase the servo gain. The principle of the notch filter is shown in __[[Figure 7-3>>http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_c84670518f0b6362.gif?rev=1.1]]__.
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350 350  
351 351  The notch width grade is used to express the ratio of the notch width to the center frequency of the notch:
352 352  
353 -[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_81c5e241dc9592c2.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_81c5e241dc9592c2.gif"]] (7-1)
357 +[[image:https://docs.we-con.com.cn/bin/download/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/07%20Adjustments/WebHome/41.png?rev=1.1]]
354 354  
355 -In formula (7-1), [[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_1acf7c31dc319d0b.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_1acf7c31dc319d0b.gif"]] is the center frequency of notch filter, that is, the mechanical resonance frequency; [[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_d742f627f5179fb3.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_d742f627f5179fb3.gif"]] is the width of notch filter, which represents the frequency bandwidth with an amplitude attenuation rate of **-3dB** relative to the center frequency of notch filter.
359 +In formula (7-1), [[image:https://docs.we-con.com.cn/bin/download/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/07%20Adjustments/WebHome/42.png?rev=1.1]] is the center frequency of notch filter, that is, the mechanical resonance frequency; [[image:https://docs.we-con.com.cn/bin/download/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/07%20Adjustments/WebHome/43.png?rev=1.1]] is the width of notch filter, which represents the frequency bandwidth with an amplitude attenuation rate of **-3dB** relative to the center frequency of notch filter.
356 356  
357 357  **(2) Depth grade of notch filter**
358 358  
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360 360  
361 361  When the notch filter depth grade is 0, the input is completely suppressed at center frequency. When the notch filter depth grade is 100, the input is completely passable at center frequency. Therefore, the smaller the the notch filter depth grade is set, the deeper the the notch filter depth, and the stronger the suppression of mechanical resonance. But the system may be unstable, you should pay attention to it when using it. The specific relationship is shown in __[[Figure 7-4>>http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_10a8f8c1383fdf94.png?rev=1.1]]__.
362 362  
363 -[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_c84670518f0b6362.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_c84670518f0b6362.gif"]]
367 +(% style="text-align:center" %)
368 +[[image:image-20220608174259-3.png]]
364 364  
365 365  Figure 7-3 Notch characteristics, notch width, and notch depth
366 366  
372 +(% style="text-align:center" %)
367 367  [[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_10a8f8c1383fdf94.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_10a8f8c1383fdf94.png"]]
368 368  
369 369  Figure 7-4 Frequency characteristics of notch filter
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