Siemens Sinamics S120M, Equipment Manual, Page: 166 / 186

9.3 Forming the DC link capacitors
9.3.1 Central components (AM600)
Description
When DC link capacitors are formed, a defined voltage is connected to them and a defined
current flows so that the appropriate capacitor characteristics are restored for them to be re-
used as DC link capacitors.
NOTICE
Damage to components when operating the AM600 after an extended period in storage
If the AM600 is kept in storage for more than 2 years, the DC link capacitors must be re-
formed. If this is not performed, the units could be damaged when they are switched on.
● Form an AM600 after it has been in storage for more than two years.
● Make sure that the storage period is calculated from the date of manufacture and not from
the date that the equipment was shipped.
If the device is commissioned within two years of its date of manufacture, the DC link capacitors
do not need to be reformed. You will find the date of manufacture in the serial number on the
rating plate.
Date of manufacture
The date of manufacture can be determined from the following assignment to the serial number
(e.g. T-J92067000015 for 2017, September):
Table 9-1 Production year and month
Character Year of manufacture Character Month of manufacture
A 2010 1 to 9 January to September
B 2011 O October
C 2012 N November
D 2013 D December
E 2014
F 2015
H 2016
J 2017
K 2018
L 2019
M 2020
N 2021
P 2022
Service and maintenance
9.3 Forming the DC link capacitors
164
Manual, 06/2019, 6SL3097-5AW00-0BP1