Frequency Inverter DF51... - Moeller.com.tr

Setting parameters04/07 AWB8230-1541GBPNU Designation RUN b031=10sValue Function DSA051 DC braking – j 00 Off: Disabled 00A052 DC braking –startingfrequencyA053 DC braking –waiting timeA054 DC braking –braking torqueA055 DC braking –brakingdurationA056 DC braking –behaviour onactivation ofthe digitalinput (DB)01 On: Enabled– j 0…60 Hz When PNU A51 is set to 01, DC braking is activated when the actualfrequency falls below the frequency entered here.– j 0…5 s When the frequency set with PNU A052 is reached, the motor coasts forthe time duration entered here before DC braking is activated.– j 0…100 % Adjustment range for the level of braking torque. 0.– j 0…60 s The time during which DC braking is active. 0.0– j 00 Timed braking according to value of PNU A055 0101 Continuous operation0.50.0Regenerative brakingIn regenerative braking, the energy from the motor is fed back intothe internal DC link of the <strong>DF51.</strong> There, this energy increases theDC link voltage. The DF51 monitors the highest permissible DC linkvoltage. At excessive values, the DF51 switches off with faultsignal E07. The regenerative energy flow can be reduced withlonger deceleration times (T b = PNU F003, a page 74).To avoid overtemperatures in the inverter:• The proportion of regenerative braking (T b ) to the operatingcycle (T c ) should not exceed 10 %.• The times for T b and T c should be f 0.1 s.• The time for T b should be F 10 s.f 2T bT cFigure 134: Braking time (T b ) / cycle time (T c )A higher dynamic braking power allows extreme braking devices(DE4-BU4-1) with braking resistors or the use of vector frequencyinverters (DV51, DV6) with built-in braking transistors and brakingresistors.122