Vacon NX Active Front End User Manual

Contents

3vacon • 12 Receipt of deliveryTel. +358 (0) 201 2121 • Fax +358 (0)201 212 2053.4 StorageIf Vacon ® NX Active Front End is to be stored before use, make sure that the ambient conditions areacceptable:When the Active Front End unit is stored without voltage being applied, the recharging of thecapacitors should be done at least once a year by connecting voltage into the unit and keeping itpowered at least for 1hour.If the storing time is much longer than one year, the recharging of the capacitors has to be carriedout so that the possible high leakage current through the capacitors is limited. The best alternativeis to use DC-power supply with adjustable current limit. Current limit has to be set for example to300…500 mA and DC-power supply has to be connected to the B+/B- terminals (DC supplyterminals). DC-voltage must be adjusted up to nominal DC-voltage level of the unit (1.35*U n AC) andshall be supplied at least for 1 hour.If DC power supply with current limiting is not available and unit has been stored much longer than1 year de-energized, consult factory before connecting the power.Storage temperature –40…+70 °CRelative humidity <95%, no condensation