Siemens SINAMICS GL150 - Replacing the Thyristor Electronics and Thyristors; Check Components of the Thyristor Assembly

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Figure 9-7 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.
9.7.6 Replacing the thyristor electronics and thyristors
9.7.6.1 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.
Maintenance
9.7 Repairs
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE 139