8
•
vacon receipt of delivery
2
2.3 Maintenance
In normal operating conditions, Vacon 20 frequency converters are maintenance-
free. However, regular maintenance is recommended to ensure a trouble-free oper-
ating and a long lifetime of the drive. We recommended to follow the table below for
maintenance intervals.
2.3.1 Capacitor recharge
After a longer storage time the capacitors need to be recharge in order to avoid ca-
pacitor damage. Possible high leakage current through the capacitors must be lim-
ited. The best way to achieve this is to use a DC-power supply with adjustable current
limit.
1) Set the current limit to 300…800 mA according to the size of the drive.
2) Then connect the DC-power supply to the input phase L1 and L2.
3) Then set the DC-voltage to the nominal DC-voltage level of the (1.35*Un AC) and
supply the converter for at least 1 h.
If DC-voltage is not available and the unit has been stored much longer than 12
months deenergized, consult the factory before connecting power.
Maintenance interval Maintenance action
Whenever necessary
• Clean headsink*
Regular
• Check tightening torques of terminals
12 months (If stored)
• Check input and output terminals and con-
trol I / O terminals.
• Clean cooling tunnel.*
• Check operation of cooling fan, check for
corrosion on terminals, busbars and other
surfaces.*
6 - 24 months (depending on environment)
• Check and clean and clean cooling fans:
Main fan
*
Interminal fan
*
* Only for frame 4 and frame 5
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