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

Setting parameters04/07 AWB8230-1541GBInterrupting the deceleration ramp -Excessively short deceleration ramps or high-inertia loads cancause unsynchronized operation during deceleration. The motorthen works regeneratively and charges up the internal DC link.Excessive voltage results in fault signal E 07.With PNU b130 you can automatically stop the deceleration rampwhen the DC link voltage reaches an excessive value duringdeceleration. The switching threshold is defined with PNU b131.Select this function if short deceleration times are required butchanging loads necessitate a longer deceleration time.Alternative: frequency inverter with braking device (DV51),a section “Regenerative braking”, page 122.PNU Designation RUN b031 =10Value Function DSb130b131Internal DC link, stopdeceleration ramp onovervoltage in the internal DClinkDeceleration ramp, switchingthreshold dependent on internalDC link voltage– j 00 Off: Disabled 00j j 330…395 V(U e =230V)01 On: Enabled: When activated, the decelerationramp is interrupted until the DC link voltage fallsbelow the value set with PNU b131 again.660…790 V(U e =400V)The default setting depends on the frequencyinverter’s rated voltage (U e ).380/760With parameter PNU b130 = 1 you can enable DC link voltagemonitoring during deceleration, a section “Regenerativebraking”, page 122. You can adjust the switching threshold withPNU b131. The default values are:• 380 V for DF51-32…• 760 V for DF51-34…U DCbU DC maxbb131When deceleration starts (STOP signal), a the output frequencyf 2 of the DF51 is reduced. If the motor speed is higher than thefrequency inverter’s output, the motor operates regeneratively andfeeds its surplus energy into the internal DC link of the <strong>DF51.</strong> Thisincreases the DC link voltage. f the DC link voltage exceeds thevalue b set under PNU b131 b, the reduction of output frequencyf 2 is stopped. The deceleration can resume only when the motorno longer operates regeneratively and the DC link voltage hasdropped below the value of PNU b131.f 2Figure 150:acMonitored DC link voltagecttU DC max = greatest permissible DC link voltage:395 V for DF51-32…790 V for DF51-34…136