Operating Instruction - Frequency Inverter 230V / 400V ... - opis.cz

ParameterSettingsNo. Description Min. Max. Fact. sett.671 Mains Failure Threshold -200.0 V -50.0 V -100.0 V672 Reference Mains Support Value -200.0 V -10.0 V -40.0 VNote:The frequency inverter reacts to the signals at the control inputs bothwhen the power failure regulation is switched on and in normal operation.A control via externally supplied control signals is only possible in the caseof a no-break supply. As an alternative, supply through the frequencyinverter is to be used.Operation mode mains failure regulation (continued)Ud, fUd676672671f673 or 683Mains voltage675Power failure Off tThe DC link voltage which is available in the case of a power failure is supplied by themotor. The output frequency is continuously reduced and the motor with its rotatingmasses is switched over to generator operation. The maximum reduction of the outputfrequency is done at the current set by the parameter Gen. Ref. Current Limit683 or the ramp Mains Support Deceleration 673 until the frequency limit ShutdownThreshold 675 is reached. If the energy of the system for bridging the mains failure isnot sufficient, the delay occurs at maximum ramp gradient as from the ShutdownThreshold 675.The time required until the motor has come to a standstill results from the regenerativeenergy of the system which results in an increase in the DC link voltage. The DClink voltage set with the parameter Reference Shutdown Value 676 is used by thevoltage controller as a control figure and kept constant. The voltage rise enables optimizationof the braking behavior and the time until the drive has come to a standstill.The behavior of the controller can be compared to stopping behavior 2 (Shutdown +Stop), as the voltage controller brings the drive to a standstill at the maximum decelerationramp and supplies it with the remaining DC link voltage.If the mains voltage is restored after the shutdown of the drive but before the undervoltageswitch-off has been reached, the frequency inverter signals a fault. The controlunit displays the fault message "F0702".If the mains failure without shutdown (Shutdown Threshold 675 = 0 Hz) takes solong that the frequency has been reduced to 0 Hz, the drive is accelerated to the referencefrequency when the mains supply is restored.02/06 147