Installing the precharging transformer
1. Remove the paint from at least one screw position on the base brackets. This is where the
transformer will be grounded.
2. Install the new transformer in the reverse order to when you removed it. Comply with the
specified torque (Page 149) of the fastening screws. When attaching the connecting cables
ensure that the cables do not twist.
3. Check that the precharger is working correctly.
9.5.12 Replacing the precharging rectifier
Removing modules
① Fastening nut
Figure 9-27 Replacing the precharging rectifier
1. Remove all connecting leads. If necessary, remove the cable ties.
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.
2. Remove the five plastic nuts ① of the module.
Installing a module
Install the new module in the reverse order to when you removed it.
Maintenance
9.5 Repair
SINAMICS SM150 6SL3845-7NN46-7AA2
168 Operating Instructions Rev.201910281345 EXAMPLE
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