PowerFlex 750-Series AC Drives User Manual

3-52 Programming and ParametersFileGroupNo.NameDescriptionValuesRead-WriteData Type385 DB ExtPulseWattsDynamic Brake External Pulse WattsSets the thermal transient response of the external dynamic brake resistordefined by the maximum allowable power to the dynamic brake resistor for 1second without exceeding the resistor’s element temperature. This parameter isonly valid when an external dynamic brake resistor is selected (P382 [DBResistor Type] = 1 “External”). If this value is not available from the resistorvendor it can be approximated by 1 or 2 below:1. [DB ExtPulseWatts] = 75,000 x weight (lbs), where weight is the weight of theresistor wire in pounds (not the weight of the entire resistor).2. [DB ExtPulseWatts] = Time Constant x Brake Watts, where the Time Constantequals the amount of time to reach 63% of its rated temperature while themaximum power is applied to the resistor and Brake Watts is the maximumcontinuous power rating of the resistor.Important: If customer supplied protection is to be used in place of the drive’scalculated resistor thermal protection, set the [DB ExtPulse Watts] to itsmaximum value.Units: WattDefault: 2000.00Min/Max: 1.00 / 100000000.00RW Real388 Flux Braking EnFlux Braking EnableDisplays a value of 1 when flux braking is active and 0 when flux braking is notactive.Default:Options:0 = “Disabled”0 = “Disabled”1 = “Enabled”RW 32-bitInteger389 Flux Braking LmtFlux Braking LimitSets the limit on the desired motor voltage during flux braking as a percent of P25[Motor NP Volts].Units: %Default: 125.00Min/Max: 100.00 / 250.00RW RealDRIVE CFGBraking Features390 Flux Braking KiFlux Braking Integral GainFlux braking controller integral gain.391 Flux Braking KpFlux Braking Proportional GainFlux braking controller proportional gain.393 DC Brake Lvl SelDC Brake Level SelectSets link to source used for P394 [DC Brake Level].Default: 10000.0Min/Max: 0.0 / 1000000.0Default: 100.0Min/Max: 0.0 / 1000000.0Default: 394Min/Max: 1 / 159999RW RealRW RealRW 32-bitInteger394 DC Brake LevelDC Brake LevelDefines the DC brake current level injected into the motor when [Stop Mode x] =3 “DC Brake.” This also sets the braking current level when 6 “Fast Stop” isselected.The DC braking voltage used in this function is created by a PWM algorithm andmay not generate the smooth holding force needed for some applications.Units: AmpsDefault: [Rated Amps]Min/Max: P21 [Rated Amps] x 0.01 / Based onDrive RatingRW Real!ATTENTION: If a hazard of injury due to movement of equipment or material exists, an auxiliarymechanical braking device must be used.ATTENTION: This feature should not be used with synchronous or permanent magnet motors. Motors maybe demagnetized during braking.395 DC Brake TimeDC Brake TimeSets the amount of time DC brake current is “injected” into the motor.When the active stop mode, P370/371 [Stop Mode X] = 2 “Ramp to Hold,” thisparameter is ignored and DC braking is applied continuously.396 DC Brake KiDC Brake Integral GainSets the integral term used in the current regulator which controls the DC Brakefunction.Units: SecsDefault: 0.00Min/Max: 0.00 / 90.00Default: 10.0Min/Max: 0.0 / 1000.0RW RealRW RealPowerFlex 750-Series User Manual – Publication 750-UM001C-EN-P – September 2009