9.7.5 Replacing the precharging transformer
WARNING
Danger to life as a result of incorrect replacing the precharging transformer
Replacing the precharging transformer incorrectly can result in death, serious injury, or
material damage.
● Follow "the five safety rules (Page 13)".
● Before replacing the precharging transformer, open the safety disconnector for the 400 V
supply.
● Lift the transformer carefully because it is heavy (> 45 kg).
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 99) of the fastening screws. When attaching the connecting cables
ensure that the cables do not twist.
3. Check that the precharger is working correctly.
Maintenance
9.7 Repair
SINAMICS SH150 6SL3805
Operating Instructions 05/2020 103
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