Vacon NXI, User Manual

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3
3.2 Storage
If the inverter is to be stored before use, make sure that the ambient conditions are acceptable:
Storage temperature –40…+70 ° C
Relative humidity <95%, no condensation
When inverter units are stored without voltage being applied, the recharging of the capacitors
should be done at least once a year by connecting voltage into the unit and keeping it powered at
least for 1 hour.
If the storing time is much longer than one year, the recharging of the capacitors has to be carried
out so that the possible high leakage current through the capacitors is limited. The best alternative
is to use DC-power supply with adjustable current limit. Current limit has to be set for example to
300…500mA and DC-power supply has to be connected to the B+/B- terminals (DC supply terminals).
DC-voltage must be adjusted up to nominal DC-voltage level of the unit (1.35*Un ac) and shall be
supplied at least for 1 hour.
If DC-voltage is not available and unit has been stored much longer than 1 year de-energized,
consult factory before connecting the power.
3.3 Maintenance
All technical devices, drives as well, need a certain amount of care-taking and failure preventive
maintenance. To maintain trouble-free operation of the drive, environmental conditions, as well as
load, line power, process control, etc. have to be within specifications, determined by manufacturer.
If all conditions are in accordance with the manufacturer's specifications, there are no other
concerns, but to provide a cooling capacity high enough for the power- and control circuits. This
requirement can be met by making sure, that the cooling system works properly. Operation of
cooling fans and cleanness of the heat sink should be verified regularly.
Regular maintenance is recommended to ensure trouble free operation and long lifetime of the
drive. At least the following things should be included in the regular maintenance.