Maintenance; Maintenance Schedule; Reforming The Capacitors - Danfoss VACON NXP FI9 Operating Manual

Operating Guide | VACON® NXI Inverters FI9-FI14

10 Maintenance

10.1 Maintenance Schedule

In normal conditions, VACON
conditions, load, line power, and process control must be within specifications, determined by the manufacturer.
Danfoss recommends annual maintenance inspections and certain component replacements based on specified operational and
environment conditions to ensure highest reliability and performance. Refer to the table for maintenance intervals.
We also recommend recording all actions and counter values with dates and time to follow up of maintenance.
Table 16: Maintenance Intervals and Tasks
Maintenance in‐ Maintenance task
terval
Reform the capacitors if the unit has not been used for 24 months (see
24 months (1)
If the unit was in store for much longer than 24 months and the capacitors were not charged, speak to the
factory to get instructions before connecting the power.
•
(2)
6–24 months
•
•
•
•
•
5–7 years Replace the cooling fans:
•
•
•
•
Replace the DC bus capacitors.
8–15 years (3)
1
If the unit is kept in store.
2
The interval is different in different environments.
3
The expected lifetime for the DC bus capacitor is between 8–15 years depending on the ambient temperature and the average load conditions. Expected service life is more than 15
years when the average load is 80% and the ambient temperature is 30 °.

10.2 Reforming the Capacitors

Context:
The electrolytic capacitors in the DC link rely on a chemical process to provide the insulator between the two metal plates. This process
can degrade over a period of years when the drive has been non-operational (stocked). The result is that the working voltage of the DC
link gradually falls.
90 | Danfoss A/S © 2019.11
®
NX Inverters are maintenance-free. To maintain trouble-free operation of the unit, environmental
Do a check of the tightening torques of the terminals.
Clean the heat sink.
Clean the cooling channel.
Make sure that the cooling fan operates correctly.
Make sure that there is no corrosion on the terminals, the busbars, or other surfaces.
If there is cabinet installation, do a check of the door filters.
the main fan
the fan of the LCL filter
the internal IP54 (UL Type 12) fan
the cabinet cooling fan/filter
Maintenance
10.2 Reforming the Capacitors.)
AQ304441431479en-000101 / DPD00909