Forming - Siemens PM330 Hardware Installation Manual

5.2

Forming

Forming the DC link capacitors
If inverters were not operational for longer than a year (if possible: storage temperature
< 40 °C), the DC link capacitors should be formed. The date of manufacture and therefore
the storage time can be determined based on the Power Module serial number. You can
take the details about the measures required when forming from the following diagram.
①
②
③
Figure 5-1
Note
Forming function
The DC link capacitors are formed using a function in the device firmware.
Review the corresponding documentation on this topic (Operating Instructions SINAMICS
G120 and G120P with CU230P-2 Control Units).
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
Storage times less than 1 year: No measures required
Storage times of between 1 and 2 years: Connect voltage for one hour before switching on
Storage times of between 2 and 3 years: Form corresponding to the curve before switching on
Storage times of 3 and more years: Form corresponding to the curve before switching on
Measures when forming the DC link capacitors
Service and maintenance
5.2 Forming
65