Danfoss VT2800 Series Design Manual

Contents

VLT ® 2800 SeriesFunction:In these parameters 302-307 Digital inputs it is possibleto choose between the different enabled functionsrelated to the digital inputs (terminals 18-33).Description of choice:No operation is selected if the frequency converter isnot to react to signals transmitted to the terminal.Reset resets the frequency converter after analarm; however, a few alarms cannot be reset(trip locked) without first disconnecting the mainssupply and reconnecting it. See table under Listof warnings and alarms. Reset is activated onthe leading edge of the signal.Coasting stop inverse is used for making the frequencyconverter "let go" of the motor immediately (outputtransistors are "turned off"), which means that the motorruns freely to stop. Logic ’0’ leads to coasting to stop.Reset and coasting inverse are used to activatemotor coast simultaneously with reset. Logical’0’ means motor coast stop and reset. Resetis activated on the falling edge.Quick stop inverse is used for activating the quick-stopramp down set in parameter 212 Quick stopramp-down time. Logic ’0’ leads to quick stop.DC-braking inverse is used for stopping the motor byenergizing it with a DC voltage for a given time, seeparameters 126, 127 and 132 DC brake. Please notethat this function is only active if the value in parameter126 DC braking time and 132 DC brake voltage isdifferent from 0. Logic ’0’ leads to DC braking.Stop inverse, a logic ’0’ means that the motor speedis ramped down to stop via the selected ramp.None of the stop commands mentionedabove are to be used as repair switches.Note that the frequency converter has morevoltage inputs than L1, L2 and L3 when the DC busterminals are used. Check that all voltage inputs aredisconnected and that the prescribed time (4 mins.)has passed before repair work is commenced.Start is selected if a start/stop command is required.Logic ’1’ = start, logic ’0’ = stop.Latched start, if a pulse is applied for min. 14 ms,the frequency converter will start the motor, providedno stop command has been given. The motor canbe stopped by briefly activating Stop inverse.Reversing is used for changing the direction ofrotation of the motor shaft. Logic ’0’ will not leadto reversing. Logic ’1’ will lead to reversing. Thereverse signal only changes the direction of rotation,it does not activate the start. Is not active at Processregulation, closed loop . See also parameter 200Output frequency range/direction.Reversing and start is used for start/stop and forreversing with the same signal. No active startcommand is allowed at the same time. Acts aslatch start reversing, provided latch start has beenchosen for terminal 18. Is not active for Processregulation, closed loop. See also parameter 200Output frequency range/direction.Start clockwise is used if you want the motor shaft onlyto be able to rotate clockwise when started. Shouldnot be used for Process regulation, closed loop.Start anticlockwise is used if you want the motorshaft only to be able to rotate anticlockwisewhen started. Should not be used for Processregulation, closed loop. See also parameter 200Output frequency range/direction.Jog is used to override the output frequencyto the jog frequency set in parameter 213 Jogfrequency. Jog is active regardless of whether astart command has been given, yet not when Coaststop, Quick-stop or DC braking are active.Freeze reference freezes the present reference.The reference can now only be changed viaSpeed up and Speed down. If freeze referenceis active, it will be saved after a stop commandand in the event of mains failure.Freeze output freezes the present output frequency(in Hz). The output frequency can now only bechanged via Speed up and Speed down .✭ = factory setting. () = display text [] = value for use in communication via serial communication portMG.28.E9.02 - VLT is a registered Danfoss trademark88