Danfoss VT2800 Series Design Manual

Contents

VLT ® 2800 Series327 Pulse reference/feedback the maximumpulse feedback frequency is set.Pulse input is selected if a specific number of pulsesmust lead to a Precise stop, see parameter 343Precise stop and parameter 344 Counter value.Selection of Setup, lsb and Selection of Setup,msb gives the possibility to select one of thefour setups. It is, however, a condition thatparameter 004 is set to Multisetup.Reset and start can be used as a start function.If 24 V are connected to the digital input, this willcause the frequency converter to reset and the motorwill ramp up to the preset reference.Pulse counter start is used to start a counterstop sequence with a pulse signal. The pulsewidth must at least be 14 ms and not longerthan the count period. See also parameter 343and the instruction, MI28CXYY.308 Terminal 53, analogue input voltage(AI [V]53FUNCT.)Value:No function (NO OPERATION) [0]✭Reference (REFERENCE) [1]Feedback (FEEDBACK) [2]Wobble (WOBB.DELTA FREQ [%]) [10]Function:In this parameter it is possible to select the functionrequired to be connected to terminal 53. Scaling of theinput signal is made in parameter 309 Terminal 53, min.scaling and parameter 310 Terminal 53, max. scaling.Description of choice:No function [0]. Is selected if the frequency converteris not to react to signals connected to the terminal.Reference [1]. If this function is selected, the referencecan be changed by means of an analogue referencesignal. If reference signals are connected to more thanone input, these reference signals must be added up.If a voltage feedback signal is connected, selectFeedback [2] on terminal 53.Wobble [10]The delta frequency can be controlled by the analoginput. If WOBB.DELTA FREQ is selected as analoginput (par. 308 or par. 314) the value selected inpar. 702 equals 100 % analog input.Example: Analog input = 4-20 mA, Delta freq. par.702 = 5 Hz → 4 mA = 0 Hz and 20 mA = 5 Hz.If this function is chosen, see Wobble InstructionMI28JXYY for further information.309 Terminal 53 Min. scaling(AI 53 SCALE LOW)Value:0.0 - 10.0 Volt ✭ 0.0 VoltFunction:This parameter is used for setting the signal valuethat is to correspond to the minimum reference orthe minimum feedback, parameter 204 Minimumreference, Ref MIN / 414 Minimum feedback, FBMIN .Description of choice:Set the required voltage value. For reasons ofaccuracy, compensation should be made for voltageloss in long signal cables. If the Time out function is tobe used (parameter 317 Time out and 318 Functionafter time out), the value set must be higher than 1 Volt.310 Terminal 53 Max. scaling(AI 53 SCALE HIGH)Value:0 - 10.0 Volt ✭ 10.0 VoltFunction:This parameter is used for setting the signal value thatis to correspond to the maximum reference valueor maximum feedback, parameter 205 Maximumreference, Ref MAX / 414 Maximum feedback, FBMAX.Description of choice:Set the required voltage value. For reasons ofaccuracy, compensation should be made forvoltage losses in long signal cables.314 Terminal 60, analogue input current(AI [MA] 60 FUNCT)Value:No function (NO OPERATION) [0]Reference (REFERENCE) [1]✭Feedback (FEEDBACK) [2]Wobble (WOBB.DELTA FREQ [%]) [10]Function:This parameter allows a choice between the differentfunctions available for the input, terminal 60.Scaling of the input signal is effected in parameter✭ = factory setting. () = display text [] = value for use in communication via serial communication portMG.28.E9.02 - VLT is a registered Danfoss trademark90