Replacing The Snubber Circuit Capacitor - Siemens SINAMICS MV 9LD4110-7EX70-1AA0 Operating Instructions Manual

Removing the AVT combination module
1. Follow "the five safety rules (Page 11)".
2. Release the control cables
3. Remove the four fixing screws
Figure 9-3
Installing the AVT combination module
1. Use the screws
2. Reconnect the control lines
9.6.2

Replacing the snubber circuit capacitor

Electric shock hazard
The snubber circuit capacitors are not equipped with discharge resistors. The energy stored in
the capacitors is discharged via a circuit in the thyristor electronics. This circuit is interrupted
when the thyristor electronics are withdrawn.
Voltages of up to several 1000 V can occur and cause an electric shock. This can result in death,
severe injuries and significant material damage.
• In this case you should always handle the capacitors as if they were charged.
• Discharge the snubber circuit capacitors. Short-circuit the snubber circuit capacitors before
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
Example of an AVT combination module
②
to secure the AVT combination module.
WARNING
you withdraw the thyristor electronics.
①
. Carefully ensure that you do not kink the fiber optic cables.
②
of the AVT combination module.
①
. Do not bend the fiber-optic conductors.
Maintenance
9.6 Repairs
123