Danfoss VT2800 Series Design Manual

Contents

VLT ® 2800 Series427 U3 voltage(U3 VOLTAGE)Value:0.0 - 999.0 V ✭ par. 103Function:See parameter 423 U1 voltage.Description of choice:Set the output voltage (U3) that is to match the thirdoutput frequency (F3), parameter 428 F3 frequency .428 F3 frequency(F3 FREQUENCY)Value:Par. 426 F2 frequency - 1000 Hz✭ Par. 104 Motor frequencyFunction:See parameter 423 U1 voltage.Description of choice:Set the output frequency (F3) that is to match the thirdoutput voltage (U3), parameter 427 U3 voltage .NB!:Parameters 437-444 are only usedif in parameter 100 Configuration aselection has been made of Processregulation, closed loop. [3].437 Process PID normal/inverse control(PROC NO/INV CTRL)Value:✭Normal (NORMAL) [0]Inverse (INVERSE) [1]Function:It is possible to choose whether the process regulatoris to increase/reduce the output frequency if thereis a deviation between the reference/setpointand the actual process mode.Description of choice:If the frequency converter is to reducethe output frequency in case the feed-back signal increases, select Normal [0].If the frequency converter is to increase theoutput frequency in case the feedback signalincreases, select Inverse [1].438 Proces PID anti windup(PROC ANTI WINDUP)Value:Not active (DISABLE) [0]✭Active (ENABLE) [1]Function:It is possible to select whether the process regulator isto continue regulating on a deviation even if it is notpossible to increase/reduce the output frequency.Description of choice:The factory setting is Enable [1], which means thatthe integration link is initialised in relation to theactual output frequency if either the current limit, thevoltage limit or the max./min. frequency has beenreached. The process regulator will not engageagain until either the error is zero or its sign haschanged. Select Disable [0] if the integrator is tocontinue integrating on the deviation, even if it is notpossible to remove the fault by such control.NB!:If Disable [0] is selected, it will mean that whenthe deviation changes its sign, the integratorwill first have to integrate down from thelevel obtained as a result of the former error, beforeany change in output frequency occurs.439 Process PID start frequency(PROC START VALUE)Value:f MIN - f MAX (parameter 201/202)✭ Par. 201 Output frequency, low limit, f MINFunction:When the start signal comes, the frequency converterwill react in the form of Open loop and will notchange to Closed loop until the programmed startfrequency is reached. This makes it possible to set afrequency that corresponds to the speed at which theprocess normally runs, which will enable the requiredprocess conditions to be reached sooner.Description of choice:Set the required start frequency.✭ = factory setting. () = display text [] = value for use in communication via serial communication portMG.28.E9.02 - VLT is a registered Danfoss trademark104