Replacing The Precharging Rectifier - Siemens 6SL3845-7NN46-7AA2 Operating Instructions & Installation Instructions

Maintenance
9.5 Repair
Installing the precharging transformer
1. Remove the paint from at least one screw position on the base brackets. This is where the
2. Install the new transformer in the reverse order to when you removed it. Comply with the
3. Check that the precharger is working correctly.
9.5.12

Replacing the precharging rectifier

Removing modules
①
Figure 9-27
1. Remove all connecting leads. If necessary, remove the cable ties.
2. Remove the five plastic nuts
Installing a module
Install the new module in the reverse order to when you removed it.
168
transformer will be grounded.
specified torque (Page 149) of the fastening screws. When attaching the connecting cables
ensure that the cables do not twist.
Fastening nut
Replacing the precharging rectifier
Note
Noting the core markings
The cables are equipped with Faston connectors. Make a note of the core markings. When
installing the new module, note the core markings for the cables.
①
of the module.
Operating Instructions Rev.201910281345 EXAMPLE
SINAMICS SM150 6SL3845-7NN46-7AA2