Siemens SINAMICS S120 Manual page 306

Maintenance and servicing
7.6 Forming the DC link capacitors
Date of manufacture
The date of manufacture can be determined as follows:
Table 7- 4
Character
Procedure in the event of repair or replacement
A replacement Line Module or Motor Module has to 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 reformed 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 400 V / 10 A or 690 V / 10 A
● 3 incandescent lamps 230 V / 100 W for a line voltage of 380 to 480 V 3 AC.
Alternatively, use 3 resistors of 1 kΩ / 100 W each (e.g. GWK150J1001KLX000 from
Vishay) instead of the incandescent lamps.
304
Production year and month
Year of manufacture
A 2010
B 2011
C 2012
D 2013
E 2014
F 2015
H 2016
J 2017
K 2018
L 2019
M 2020
N 2021
P 2022
R 2023
Character Month of manufacture
1 to 9 January to September
O
N
D
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A
October
November
December