Siemens SINAMICS G120XA - Forming DC Link Capacitors; Production Year and Month; Forming the DC Link Capacitors

5.3.2 Forming DC link capacitors
Overview
You have to reform the DC link capacitors if the converter has been stored for more than one
year. Non-formed DC link capacitors can damage the converter in operation.
Precondition
The converter has not yet been used, and according to the production date it was made over
a year ago.
The production date of the converter is coded in the 3rd and 4th digit of the serial number on the
rating plate: S . . ③④…
● Example: Serial number S ZVK5375000118 → Production date May 2018
Table 5-1 Production year and month
Digit ③ Production year Digit ④ Month of manufacture
K 2018 1 ... 9 January ... September
L 2019 0 October
M 2020 N November
… … D December
Function description
You form the DC link capacitors by supplying the converter with a line voltage of ≤ 100% of the
rated voltage for a defined time.
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Figure 5-3 Forming the DC link capacitors
Commissioning
5.3 Preparing for commissioning
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 107