Danfoss VLT AutomationDrive FC 360 Programming Manual

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Danfoss VLT AutomationDrive FC 360 Programming Manual Manual pdf 29 page image

3.3 Parameters: 2-** Brakes2-00 DC Hold/Motor Preheat CurrentRange: Function:50 %* [0 -160 %]Set holding current as a percentage of therated motor current IM,N 1-24 Motor Current. Thisparameter holds the motor function (holdingtorque) or pre-heats the motor. This parameteris active if [0] DC hold is selected in 1-72 StartFunction, or if [1] DC hold/pre-heat is selected in1-80 Function at Stop.NOTEThe maximumm value depends on therated motor current. Avoid 100% currentfor too long. It may damage the motor.2-01 DC Brake CurrentRange: Function:50 %* [0 - 150%]Set current as % of rated motor current,1-24 Motor Current. DC brake current is appliedon stop command, when speed is below thelimit set in 2-04 DC Brake Cut In Speed; whenthe DC Brake Inverse function is active; or viathe serial port. See 2-02 DC Braking Time forduration.NOTEThe maximum value depends on the rated motor current.Avoid 100% current for too long. It may damage themotor.2-02 DC Braking TimeRange: Function:10 s* [0 - 60 s] Set the duration of the DC braking current setin 2-01 DC Brake Current, once activated.2-04 DC Brake Cut In SpeedRange: Function:0 Hz* [ 0 - 400Hz]This parameter is for setting the DC brakecut in speed at which the DC brakingcurrent 2-01 DC Brake Current is to beactive, in connection with a stop command.NOTE2-01, 2-02 and 2-04 will not have effect when 1-10 MotorConstruction = [1] PM, non salient SPM.3.3.1 2-1* Brake Energy Funct.Parameter group for selecting dynamic braking parameters.Only valid for frequency converters with brake chopper.2-10 Brake FunctionOption: Function:[0] Off No brake resistor is installed.[1] ResistorbrakeA brake resistor is incorporated in the system fordissipation of surplus brake energy as heat.Connecting a brake resistor allows a higher DClink voltage during braking (generatingoperation). The brake resistor function is onlyactive in frequency converters with an integraldynamic brake.[2] AC brake Improves braking without using a brake resistor.This parameter controls an over-magnetisation ofthe motor when running with a generatoric load.This function can improce the OVC-function.Increasing the electrical losses in the motor,allows the OVC-function to increase brakingtorque without exceeding the voltage limit.NOTEThe AC brake is not as efficient as dynamicbraking with resistor.AC brake is for VVCplus mode in both openand closed loop.2-11 Brake Resistor (ohm)Range: Function:Sizerelated*[ 0 -65535Ohm]Set the brake resistor value in Ω. Thisvalue is used for monitoring the powerto the brake resistor. 2-11 BrakeResistor (ohm) is only active infrequency converters with an integraldynamic brake. Use this parameter forvalues without decimals.2-12 Brake Power Limit (kW)Range: Function:Sizerelated*[0.001- 2000kW]2-12 Brake Power Limit (kW) is the expectedaverage power dissipated in the brake resistorover a period of 120 s. It is used as themonitoring limit for 16-33 Brake Energy /2 minand thereby specifies when a warning/ alarmis to be given.To calculate 2-12 Brake Power Limit (kW), thefollowing formula can be used.Pbr,avgW =Ubr2V ×tbrsRbrΩ ×TbrsPbr,avg is the average power dissipated in thebrake resistor, Rbr is the resistance of theParameter Descriptions VLT® AutomationDrive FC 360 Programming GuideMG06C102 - VLT® is a registered Danfoss trademark 273 3