Maintenance and service
6.5 Forming the DC link capacitors
Air-Cooled Chassis Power Units - supplement to Motor Module 6SL3320-1TG41-5AA3
80
Equipment Manual, 10/2020, A5E50422764A
Procedure in the event of repair or replacement
Replacement Motor Modules or the corresponding replacement power block must be
reformed after being in storage for a period of more than two years.
The DC link capacitors are formed by connecting the line voltage without any load connected
for at least 30 minutes.
To do this, the DC link must be precharged (i.e. the Line Modules switched on), while the
controller for the existing Motor Modules must not be enabled for the specified length of
time.
Procedure for re-forming outside the drive line-up
Replacement power units which have to be held ready for immediate use in the event of
repair or replacement can also be re-formed individually and outside the drive line-up.
For this, the equipment must be connected to the forming circuits described in the following.
Components for the forming circuit (recommendation)
•
1 fuse switch 3-phase 690 V / 10 A
•
Six incandescent lamps 230 V / 100 W for a line voltage of 3 AC 500 to 690 V, where two
incandescent lamps must be connected in series in each supply phase.
Alternatively, use three resistors of 1 k
Ω
/ 160 W each (e.g. GWK200J1001KLX000 from
Vishay) instead of the incandescent lamps.
•
Various small components, such as lamp sockets, cable 1.5 mm
2
, etc.
WARNING
Electric shock when lamp sockets are installed so that they are not insulated
If two incandescent lamps connected in series are used, the insulation of the lamp
sockets is not designed for a high voltage of 3 AC 500 to 690 V. Touching live parts can
result in death or serious injury.
•
For a line voltage of 500 to 690 V 3-ph AC, install the two lamp sockets connected in
series so that they are carefully insulated - and protect them so that they cannot be
touched.