Siemens 6SE7086-4AH85-1BA0 operating instructions Maintenance, Thyristor replacement

8 Maintenance

WARNING

The warning notes for "air-cooled units" apply.

Installation and maintenance work relating to the water-equipment is only to be done when the installation is off load.

8.1Thyristor replacement

d

s

a

f g f

1.) Remove reference spacer a (accuracy: ± 0.1 mm)

2.) Loosen lock nut (SW 46) s .

3.) Unscrew adjusting screw (SW 22) d max. four turns.

4.) Carefully press apart the contact rails f of the corresponding thyristor.

5.) Remove thyristor disc g.

6.) Using a spatula, apply a thin layer of contact grease (Elektrolube 2A-X) to the new thyristor disc.

7.) Insert new thyristor disc. Make sure it is positioned correctly (polarity and terminals)! Connect firing cables.

8.) Screw in adjusting screw (M30x1.5) d until the reference gauge a has been reached.

9.) Firmly tighten s lock nut.

The position of the thyristor and its diameter may not be the same as in the diagram! After a thyristor defect, check the fuse indicators at the least.

For further information and warnings, see the operating instructions for air-cooled rectifier or rectifier/regenerating units.