Replacing The Thyristor Electronics And Thyristors; Check Components Of The Thyristor Assembly - Siemens SINAMICS MV 9LD4110-7EX70-1AA0 Operating Instructions Manual

Figure 9-6 Removing the current transformer
Installing the current transformer
To install the current transformer, proceed as follows:
1. Carry out the removal steps in reverse order.
2. Screw the screws into the busbars with a tightening torque of 25 Nm.
3. After installing the current transformer, check that it works properly.
9.6.6

Replacing the thyristor electronics and thyristors

9.6.6.1

Check components of the thyristor assembly

In the event of a thyristor assembly failing, establish which component has failed:
• Thyristor (by resistance measurement)
When a thyristor fault message is output, the fault value indicates which thyristor is
affected. Check the thyristor resistance while it is installed.
• Thyristor electronics (by replacement)
Send the replaced thyristor electronic boards to the manufacturer for testing.
• Fiber-optic cables
Replace the fiber-optic cables according to the instructions for laying fiber-optic cables.
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
Maintenance
9.6 Repairs
127