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158 Maintenance
WARNING!
To avoid breaking the coolant pipes, do not overtighten the nuts of the unions.
Leave 2 to 3 millimeters (0.08 to 0.12 inches) of thread visible.
5.
Reconnect the control wiring to the module.
6.
Fill up the cooling system. For instructions, see section
internal cooling
7.
Close the swing-out frame (if present). Reinstall all shrouds removed earlier.
8.
If the module is an inverter module, and the Safe torque off function is in use, perform
a validation test as described under
Capacitors
The DC link of the drive contains several electrolytic capacitors. Operating time, load, and
surrounding air temperature have an effect on the life of the capacitors. Capacitor life can
be extended by decreasing the surrounding air temperature.
Capacitor failure is usually followed by damage to the unit and an input cable fuse failure,
or a fault trip. If you think that any capacitors in the drive have failed, contact ABB.
Reforming the capacitors
￭
The capacitors must be reformed if the drive has not been powered (either in storage or
unused) for a year or more. The manufacturing date is on the type designation label. For
information on reforming the capacitors, refer to
(3BFE64059629
[English]).
2...3 mm (0.08 ... 0.12")
circuit.
Filling up and bleeding the
Start-up including validation test (page
Capacitor reforming instructions
225).
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