ABB 07KT92 Channel isolation module

Two digital anti-resonant low-pass filters ARF0 and ARF1 are included in the velocity loop. Their purpose is to lower the gain above fvc and especially at any resonant frequency > fvc so that oscillations do not occur. Recommended values are shown below:If the velocity loop bandwidth cannot be raised to an acceptable value without encountering a resonant oscillation, the procedure on the following page is recommended.

It would seem from the above that setting KVP

 is simply a matter of increasing its value to compensate for load inertia. Unfortunately, the following problems often interfere, particularly when the load inertia is large compared with the motor’s inertia: 1. Mechanical resonance between motor and load cause high frequency oscillation. 2. Backlash between motor and load effectively unload the motor over a small angle. Within this small angle the increased bandwidth results in oscillation. 3. Ripple in the velocity feedback signal results in large motor ripple current if KVP is large. As a general rule, any system with KVP set higher than 5 times the medium bandwidth setting will require adjustment to the default ARF0 and ARF1 settings.

Resonance 

Mechanical resonance is caused by springiness between motor inertia and load inertia. This may result from belts, flexible couplings, or the torsional stiffness of shafts. In general, the stiffer the couplings, the higher the resonance frequency and the easier it is to tune the system for good performance. If the velocity loop breaks into an oscillation at a frequency well above the calculated velocity loop bandwidth, a resonance problem may well exist. A second symptom is that the frequency of oscillation is relatively constant in the presence of changes to ARF0 and ARF1.

                                                                        

Brand display

 ABB、GE/FUANC、FOXBORO、TRICONEX 、BENTLY、A-B、EMERSON 、MOTOROLA、XYVOM、HONEYWELL 、REXROTH、KUKA、NI、DEIF、Yokogawa、WOODWARD、Reliance Electric、SCHNEIDER 、MOOG、PROSOFT、KOLLMORGEN、ICS TRIPLEX、HIMA

This article from the temporal Ming sheng automation equipment co., LTD., reproduced please attach this link: http://www.stockdcs.com/