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

Setting parameters04/07 AWB8230-1541GBOutput voltage and voltage boostIf the mass inertia moment or static friction of the connected loadis high, the output voltage must be increased (boosted) beyondthe normal U/f <strong>com</strong>ponent at low output frequencies. This<strong>com</strong>pensates for the voltage drop in the motor windings and canbe up to half of the motor’s nominal voltage. The voltage boost isdefined as a percentage value with parameters PNU A042 andA043.hOperation at low speeds over a longer period can causeoverheating of the motor. If the boost value is too high,A043 = 10the resulting higher current may cause a fault signal. Figure 72: Voltage boost characteristicsU[%]100A042 = 2005.0 25.0 50.0f [HzPNU A041 lets you select between a manual boost characteristic(PNU A041 = 00) and automatic voltage boost (PNU A041 = 01.Automatic voltage boost is added to the U/f characteristic valuedepending on the current load (determined by currentmeasurement).Parameter settings for manual voltage boost:A042 = 20 % of the output voltageA043 = 10 % of 50 Hz (A004) = 5 HzA044 = 00 (constant torque characteristic)A045 = 100 % (output voltage = mains voltage)PNU Designation RUN b031= 10Value Function DSA041 Voltage boost j j 00 Manual voltage boost 00A241characteristics01 Automatic voltage boostA042 Boost, manual j j 0…20 % Setting the voltage increase with manual boost. 1.8A242A043voltage boostBoost, j j 0…50 % Setting the frequency with the highest voltage boost as a percentage of 10A243transitionthe base frequency (PNU A003).frequency formaximumvoltage boostA044A045U/fcharacteristicU/fcharacteristic –output voltage– – 00 Constant torque curve 0001 Reduced torque curve– – 20…100 % U100[%]100A04520A2450f [Hz]If the rated motor voltage is lower than the mains voltage, enter themains voltage in PNU A082 (a page 69) and reduce the outputvoltage in PNU A045 to the rated motor voltage.Example: At 440 V mains voltage and 400 V rated motor voltage enter:PNU 082 = 440 V, PNU A045 = 91 % (= 400/440 x 100 %).70