3.20 Parameters: 30-** Special Features3.20.1 30-0* Wobble FunctionThe wobble function is primarily used for synthetic yarnwinding applications. The wobble option is installed in thefrequency converter controlling the traverse drive. The yarnmoves back and forth in a diamond pattern across thesurface of the yarn package. To prevent a build-up of yarnat the same points at the surface, this pattern must bealtered. The wobble option can accomplish this by contin-uously varying the traverse velocity in a programmablecycle. The wobble function is created by superimposing adelta frequency around a centre frequency. To compensatefor the inertia in the system, a quick frequency jump canbe included. Especially suitable for elastic yarn applications,the option features a randomised wobble ratio.175ZB001.10Par. 30-09: RANDOM FUNCPar 30-11: RANDOM MAXPar 30-12: RANDOM MINTDOWN T UPPar. 30-06: JUMP TIMEPar. 30-04 [Hz]: JUMP FREQPar. 30-09 [%] : JUMP FREQCENTER FREQPar. 30-07: WOBB TIMEFrequency[Hz]Time [s]Par. 30-01 [Hz]: DELTA FREQ.Par. 30-02 [%]: DELTA FREQ.(Par. 30-03)Par. 30-01 [Hz]Par. 30-02 [%](Par. 30-03:)Par. 30-*1: RAMP UPPar. 30-10: [RATIO TUP / TDOWN ]Par. 30-08: [INDEPENDENT UP and DOWN]Illustration 3.64 Wobble Function30-00 Wobble ModeOption: Function:NOTICEThis parameter cannot be adjusted whilerunning.The standard speed open loop mode inparameter 1-00 Configuration Mode is extendedwith a wobble function. In this parameter, it ispossible to select which method to be used forthe wobbler. The parameters can be set asabsolute values (direct frequencies) or asrelative values (percentage of other parameter).The wobble cycle time can be set as anabsolute value or as independent up and downtimes. When using an absolute cycle time, theup and down times are configured through thewobble ratio.[0]*Abs. Freq.,Abs. Time[1] Abs. Freq.,Up/ DownTime[2] Rel. Freq.,Abs. Time30-00 Wobble ModeOption: Function:[3] Rel. Freq.,Up/ DownTime3.20.2 Centre FrequencyNOTICEThe setting of “Centre Frequency” takes place via thenormal reference handling parameter group, 3-1*References.30-01 Wobble Delta Frequency [Hz]Range: Function:5 Hz* [0 -25 Hz]The delta frequency determines the magnitude ofthe wobble frequency. The delta frequency issuperimposed on the centre frequency.Parameter 30-01 Wobble Delta Frequency [Hz]selected both the positive and negative deltafrequency. The setting of parameter 30-01 WobbleDelta Frequency [Hz] must thus not be higher thanthe setting of the centre frequency. The initialramp up time from standstill until the wobblesequence is running is determined by parametergroup 3-1* References.30-02 Wobble Delta Frequency [%]Range: Function:25 %* [0 - 100%]The delta frequency can also be expressed aspercentage of the centre frequency and canthus be maximum 100%. The function is thesame as for parameter 30-01 Wobble DeltaFrequency [Hz].30-03 Wobble Delta Freq. Scaling ResourceOption: Function:Select which frequency converterinput should be used to scale thedelta frequency setting.[0] * No function[1] Analog Input 53[2] Analog Input 54[3] Frequency input 29 FC 302 only[4] Frequency input 33[7] Analog Input X30/11[8] Analog Input X30/12[15] Analog Input X48/230-04 Wobble Jump Frequency [Hz]Range: Function:0 Hz* [ 0 -20.0Hz]The jump frequency is used to compensate forthe inertia in the traverse system. If a jump inParameter Descriptions Programming GuideMG33MJ02 Danfoss A/S © Rev. 10/2014 All rights reserved. 1693 3