TT system (Page 77)
IT system (Page 78)
Precondition
Switch off the converter power supply before removing the functional grounding.
WARNING
Electric shock as a result of a residual charge in power components
After the power supply has been switched off, it takes up to 5 minutes until the capacitors in
the converter have discharged so that the residual charge is at a non-hazardous level.
Therefore, touching the converter immediately after powering off can result in electric shock
due to residual charge in the power components.
● Check the voltage at the converter connections before you remove the functional
grounding.
Removing screw for functional grounding, FSG
Disconnecting the basic interference suppression module, FSH/FSJ
If a converter FSH or FSJ is operated from a non-grounded line supply (IT system), the
connection to the basic interference suppression module of the Power Module must be opened.
Procedure
1. Open the left-hand housing flap of the converter by rotating latch ①.
2. Release the two captive screws ③ and ④.
3. Release the screws ②, ⑤, and ⑥, but do not remove the screws.
Wiring
4.1 Line supply and motor
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 79
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