PowerFlex 750-Series AC Drives User Manual

3-72 Programming and ParametersFileGroupRead-WriteData TypeNameNo. DescriptionValues636 Speed Reg BWSpeed Regulator BandwidthSets the speed loop bandwidth and determines the dynamic behavior of thespeed loop. As bandwidth increases, the speed loop becomes more responsiveand can track a faster changing speed reference. A change to this parameter willcause an automatic update of P645 [Speed Reg Kp], P647 [Speed Reg Ki] andP644 [Spd Err Filt BW]. The configuration settings for Inertia Adaption (productdependent) will also be automatically selected when this feature is enabled. Todisable the automatic gain and filter update, set this parameter to a value of zero.The maximum allowable value of this parameter will be limited by the ratio ofP646 [Spd Reg Max Kp] to P76 [Total Inertia], and the type of speed feedbacksource in use (encoder vs. open loop). For operation following an automatic tachswitchover, the bandwidth specified in P648 [Alt Speed Reg BW] will be used.Units:Default:Min/Max:R/SCalculated0.00 / CalculatedRW RealSPEED CONTROLSpeed Regulator637 SReg FB Fltr SelSpeed Regulator Feedback Filter SelectSelects the amount of filtering applied to the feedback channel of the speedregulator, and is only active in FV motor control modes (P35). When set to any ofthe custom settings (3, 4, or 5) the filter is configured using the values set in P638[Spd Ref Fltr BW] and P639 [Spd Ref FltrGain]. Settings 4 and 5 initialize thevalues for light and heavy respectively.638 SReg FB FltrGainSpeed Regulator Feedback Filter GainSets the gain of the speed regulator feedback filter when P637 [SReg FB Fltr Sel]is set to one of the “Custom” settings (3, 4, or 5).A gain value of zero results in a filter characteristic that behaves as a first orderlow pass. A gain value ranging between zero and one results in a lag type filter. Again value greater than one results in a lead type filter. A gain value of one willdisable (bypass) the filter.Default:Options:0 = “Off”0 = “Off”1 = “Light”2 = “Heavy”3 = “Custom”4 = “SetCustLight”5 = “SetCustHeavy”Default: 0.700Min/Max: –5.000 / 20.000RW 32-bitIntegerRW Real639 SReg FB Fltr BWSpeed Regulator Feedback Filter BandwidthSets the bandwidth of the speed regulator feedback filter when P637 [SReg FBFltr Sel] is set to one of the “Custom” settings (3, 4, or 5).A value of zero will disable (bypass) the filter.640 Filtered SpdFdbkFiltered Speed FeedbackDisplays the output of the filter that is applied by P637.Units: R/SDefault: 35.00Min/Max: 0.00 / 3760.00RW RealUnits:Default:Min/Max:HzRPM0.00–/+P27 [Motor NP Hertz] x 8–/+P28 [Motor NP RPM] x 8ROReal641 Speed ErrorSpeed ErrorDisplays the error (difference) between the P597 [Final Speed Ref] (+) and theP640 [Filtered SpdFdbk] (–). This error signal is the primary input for the Vectorcontrol mode speed regulator.Units: HzDefault: RPMMin/Max: 0.00–/+P27 [Motor NP Hertz] x 8–/+P28 [Motor NP RPM] x 8RORealPowerFlex 750-Series User Manual – Publication 750-UM001C-EN-P – September 2009