Forming The Dc Link Capacitors - Siemens SINAMICS S120 Combi User Manual

Service and maintenance

14.5 Forming the DC link capacitors

14.5 Forming the DC link capacitors
If the S120 Combi Power Modules and the Motor Modules Booksize Compact have been
kept in storage for more than two years, the DC link capacitors have to be reformed. If the
capacitors are not reformed, then there is a danger that the components could be damaged
when switching on.
If the cabinet is commissioned within two years of its date of manufacture, the DC link
capacitors do not need to be reformed. The date of manufacture can be taken from the serial
number on the rating plate.
Note
The storage period is calculated from the date of manufacture and not from the date that the
equipment was shipped.
A defined voltage and a limited current are applied to the DC link capacitors when forming
them. As a consequence, the internal relationships required for the DC link capacitors to
function correctly are re-established.
Date of manufacture
The date of manufacture can be determined from the following assignment to the serial
number (e.g. T-XN2067000015 for 2009, November):
Table 14- 6 Production year and month
Character
X
A
B
C
D
The serial number is found on the rating plate.
278
CAUTION
Year of manufacture
2009
2010
2011
2012
2013
Character
1 to 9
O
N
D
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
Month of manufacture
January to September
October
November
December
SINAMICS S120 Combi