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3
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.
.
Table 1. Proactive maintenance schedule
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 corrosion 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
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