Vacon nx User Manual

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Vacon nx User Manual Manual pdf 17 page image

RECEIPT OF DELIVERY vacon • 1724-hour support +358 (0)201 212 575 • Email: vacon@vacon.com 33.2 StorageIf the frequency converter is to be kept in store before use make sure that the ambient conditions areacceptable:Storing temperature –40…+70°CRelative humidity <95%, no condensationIf the converter is to be stored during longer periods power should be connected to the converter once ayear and kept on for at least 2 hours. If the storage time exceeds 12 months the electrolytic DC capacitorsneed to be charged with caution. Therefore, such a long storage time is not recommended. If longerstorage time is, however, necessary, follow the instructions in chapter 3.3.1 to recharge the capacitors.3.3 MaintenanceIn normal conditions, Vacon NX_ frequency converters are maintenance-free. However, regularmaintenance is recommended to ensure a trouble-free operation and a long lifetime of the drive. Werecommend to follow the table below for maintenance intervals.Maintenance interval Maintenance actionWhenever necessary • Clean heatsinkRegularly • Check tightening torques of terminals12 months (if unit stored) • Recharge capacitors (see chapter 3.3.1)6-24 months(depending on environment)• Check input and output terminals and controlI/O terminals.• Clean cooling tunnel.• Check operation of cooling fan, check for cor-rosion on terminals, busbars and other surfaces• Check door filters in case of cabinet installation5-7 years • Change cooling fans:- main fan- internal IP54 fan- cabinet cooling fan/filter5-10 years • Change DC bus capacitorsTable 3-1. Maintenance intervals3.3.1 Capacitor rechargeAfter a longer storage time the capacitors need to be recharged in order to avoid capacitor damage.Possible high leakage current through the capacitors must be limited. The best way to achieve this is touse a DC-power supply with adjustable current limit.1) Set the current limit to 300…800mA according to the size of the drive.2) Then connect the DC-power supply to the B+/B- terminals (DC+ to B+, DC- to B-) of the DC-link ordirectly to the capacitor terminals. NX converters with no B+/B- terminals (FR8/FR9) can be poweredconnecting the DC-supply between two input phases (L1 and L2).3) In drives FR8 to FR12: To ensure full recharge of capacitors, remove the fuses of the cooling fan. Askfactory for further instructions if necessary.4) Then set the DC-voltage to the nominal DC-voltage level of the unit (1.35*Un AC) and supply theconverter for at least 1h.If DC-voltage is not available and the unit has been stored much longer than 12 months deenergized,consult the factory before connecting power.