12 • vacon
RECEIPT OF DELIVERY
3.3 Storage
If the frequency converter is to be kept in store before use make sure that the ambient conditions
are acceptable:
Storing temperature –40…+70 C
Relative
humidity
<95%,
no
condensation
The environment should also be free from dust. If there is dust in the air the converter should be
well protected to make sure dust does not get into the converter.
If the converter is to be stored during longer periods the power should be connected to the converter
once in 24 months and kept on for at least 2 hours. If the storage time exceeds 24 months the
electrolytic DC capacitors need to be charged with caution. Therefore, such a long storage time is
not recommended.
If the storing time is much longer than 24 months, 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 a DC-power supply with adjustable current limit. The current limit has to be set for example
to 300…500mA and the DC-power supply has to be connected to the B+/B- terminals (DC supply
terminals).
DC-voltage must be adjusted to nominal DC-voltage level of the unit (1.35*Un AC) and supplied at
least for 1 hour.
If DC-voltage is not available and the unit has been stored de-energized much longer than 1 year
consult factory before connecting power.
3.4 Maintenance
In normal conditions, Vacon NX frequency converters are maintenance-free. However, we
recommend to keep the converter clean, e.g. by cleaning the heatsink with compressed air
whenever necessary.
In IP54 units, the air filters in the door and in the roof should be cleaned or replaced regularly.
We also recommended to follow proactive maintenance schedule to ensure the highest possible
utilization rate of the cabinet drive.
Maintenance interval
Maintenance action
12 months (if unit stored)
Reform capacitors (see separate instruction)
6-24 months
(depending on environment)
Check I/O terminals
Check tightness of mains connection
Clean cooling tunnel
Check operation of cooling fan, check for cor-
rosion on terminals, busbars and other surfaces
Check door and roof filters
5-7 years
Change cooling fans:
-
main fan
-
fan of the LCL filter
5-10 years
Change DC bus capacitors if DC voltage ripple
is high
Table 3-1. Proactive maintenance schedule
Clearwater Tech - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.clrwtr.com - Email: [email protected]
