Danfoss VLT FCM Series Manual

Also see for VLT FCM 305: Quick setup

Contents

VLT ® FCM SeriesDescription of choice:Set the desired time.127 DC brake cut-in frequency(DC BRAKE CUT-IN)Value:0.0 - f MAX (PARAMETER 202) [0 -]0.0 Hz = OFF [0]DC braking see P132Function:This parameter is for setting the DC brake cut-infrequency at which the DC braking voltage (parameter132) is to be active, in connection with a Stop command.Description of choice:Set the desired frequency.128 Motor thermal protection(MOTOR THERM. PROTEC.)Value:✭Disable (DISABLE) [0]Enable (ENABLE) [1]Function:FCM always disable [0]Description of choice:If Disable [0] is selected no tripping is requiredwhen the motor is overloaded.132 DC braking voltage(DC BRAKE VOLTAGE)Value:0 - 100 % [v0-100]✭0 % [0]Function:DC braking:If the stator in an asynchronous is supplied withDC voltage, a braking torque will arise.The braking torque depends on the selectedDC braking voltage.For applying a braking torque by means of DCbraking the rotating field (AC) in the motor isexchanged with a stationary field (DC)The DC braking will be active when below cutin frequency and stop is activated at the sametime. P126, R127 and P132 are used for thecontrol of the DC braking.The DC braking can also be activated directlyby a digital input.Function:The braking torque depends on the selected DCbraking voltage. The DC braking voltage is stated asa percentage of maximum braking voltage.Description of choice:Set the desired voltage as a specified percentageof maximum braking voltage.NB!:The DC braking voltage cannot be usedas a holding brake.133 Start voltage(START VOLTAGE)Value:0.00 - 100.00 V [0-10000]✭Depends on motorFunction:You can set the motor voltage below the field weakeningpoint independently of the motor current. Use thisparameter to compensate too low starting torque.The start voltage is the voltage at 0 Hz.NB!:If the start voltage is set too high, it can leadto magnetic saturation and motor overheating;the FC motor may trip. Therefore takecare when using the start voltage.Description of choice:Set the desired start voltage.134 Load compensation(LOAD COMPENSATION)Value:0.0 - 300.0 % [0-3000]✭100.0 % [1000]Function:In this parameter, the load characteristic is set. Byincreasing the load compensation, the motor is given anextra voltage and frequency supplement at increasingloads. This is used e.g. in motors/applications in✭ = factory setting. () = display text [] = value for use in communication via serial communication portMG.03.H3.02 - VLT is a registered Danfoss trademark42