Danfoss VLT 6002-6011 Installation, Operation And Maintenance Manual

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Danfoss VLT 6002-6011 Installation, Operation And Maintenance Manual Manual pdf 63 page image

63Feedback Signals in Open LoopIn some drives, feedback signals and feedback parameters are onlyused in closed loop operation. In the VLT 6000, the feedback signalsare also active in open loop operation. Although they don’t effect thespeed of the drive, they can be displayed on the drive’s meters.Parameters 227 and 228 can set high and low limits for the feedbacksignals, which can activate warnings.For open or closed loop operation, the feedback signal is scaled inparameters 413 and 414 Minimum and Maximum Feedback, and theunit displayed is chosen in parameter 415, Process Units.413 Minimum Feedback (MIN. FEEDBACK)Value:-999,999.999 to Maximum Feedback, Parameter 414 0.000Function:Parameters 413 Minimum Feedback and 414 Maximum Feedback,are used to scale the feedback signal.Description of choice:Set the value to be shown on the display when the feedbck signal is atits minimum value.414 Maximum Feedback (MAX. FEEDBACK)Value:Minimum Feedback to 999,999.999 100.000Function:See the description of parameter 413, Minimum Feedback.Description of choice:Set the value to be shown on the display when the feedback signal is atits maximum.415 Units Relating to Closed Loop(REF. / FDBK. UNIT)Value:No unit [0] °C [21] % [1] GPM [22]rpm [2] gal/s [23]ppm [3] gal/min [24]pulse/s [4] gal/h [25]l/s [5] lb/s [26]l/min [6] lb/min [27]l/h [7] lb/h [28]kg/s [8] CFM [29]kg/min [9] ft3/s [30]kg/h [10] ft3/min [31]m3/s [11] ft3/h [32]m3/min [12] ft/s [33]m3/h [13] in wg [34]m/s [14] ft wg [35]mbar [15] PSI [36]bar [16] lb/in2 [37]Pa [17] HP [38]kPa [18] °F [39]m wg [19]kW [20]Function:Selects the unit shown on the feedback display.The selected unit is used if Reference [unit] or Feedback [unit] hasbeen selected in one of the parameters 007 through 010, as well as inthe Display Mode. It will be the unit for Minimum/Maximum Feedback.In Closed Loop, the unit is also used as the unit for Minimum/MaximumReference and Minimum/Maximum Feedback, as well as Setpoint 1and Setpoint 2.Description of choice:Select the unit for the reference/feedback signal.✭ Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.