Receipt of delivery vacon • 15
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3
3.5 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 VACON
®
NX Active Front End,
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
VACON
®
NX Active Front End. At least the following things should be included in the regular
maintenance.
It is also recommended to record all actions and counter values with dates and time for follow up of
maintenance.
Table 6. Maintenance interval
Interval Maintenance
12 months (if unit is stored) Capacitor reforming, see Chapter 3.4.
6 - 24 months (The interval is different in
different environment.)
Check tightening torque of the input and output
terminals and I/O terminals.
Clean the heat sink.
Clean the cooling tunnel.
Check operation of the cooling fan, check for
corrosion on terminals, bus bars and other
surfaces.
Check the door filters.
5 - 7 years
Change the cooling fans.
• Main fan of the unit.
• Fan of the LCL filter.
• Internal IP54 (UL Type 12) fan.
• Cabinet cooling fan/filter.
5 - 10 years
Change the DC bus capacitors if DC voltage ripple is
high.
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