Table 52: The maintenance intervals and tasks
Maintenance interval
Maintenance task
Whenever necessary
Clean the heat sink.
Regularly
Do a check of the tightening torques of the terminals.
12 months (if the AC drive is kept in store)
Reform the capacitors (see Chapter 8.6.1 Capacitor
reforming)
6-24 months (The interval is different in different envi-
ronments.)
Do a check of the mains cable terminal, motor cable
terminal and the control terminals.
Clean the cooling tunnel.
Make sure that the cooling fan operates correctly.
Make sure that there is no corrosion on the terminals,
the busbars or other surfaces.
Do a check of the door filters, if you have a cabinet
installation.
5-7 years
Change the cooling fans:
•
the main fan
•
the internal IP54 (UL Type 12) fan
•
the cabinet cooling fan/filter
5-10 years
Change the DC bus capacitors.
8.6.1
CAPACITOR REFORMING
After a long storage time, it is necessary to reform the capacitors to prevent damage to the
capacitors. To make sure that the possible high leakage current through the capacitors stays
in minimum, use a DC-power supply with an adjustable current limit.
1
Set the current limit to 300-800mA to agree with
the size of the drive.
2
Connect the DC-power supply to the B+/B-
terminals (DC+ to B+, DC- to B-) of the DC-link or
directly to the capacitor terminals. In the NX AC
drives with no B+/B- terminals (FR8/FR9), connect
the DC-supply between 2 input phases (L1 and L2).
3
In drives FR8 to FR11: To make sure that the
capacitors are fully charged, remove the fuses of
the cooling fan. If necessary, speak to the factory to
get more instructions.
4
Set the DC-voltage to the nominal DC-voltage level
of the AC drive (1.35*Un AC) and give the AC drive
power for 1 hour, at minimum.
If the AC drive was in store for much longer than 12 months and the capacitors were not
charged, speak to the factory to get instructions before you connect the power.
VACON · 128
COMMISSIONING AND ADDITIONAL INSTRUCTIONS
8
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