6. Remove the TAS board.
7. Remove the thyristor with the gate lead or the diode facing forwards.
Installing a thyristor
1. Clean the surfaces of the thyristors and heat sinks with ethanol.
2. Apply a thin coat of the contact oil provided to the thyristor surfaces.
– To do this, spray the contact oil onto a lint-free cloth.
– Apply this to the contact surfaces of the thyristor.
3. Then immediately install the thyristor.
NOTICE
Damage to the surface of the thyristor
The surface of the thyristor can be damaged by the TAS board holder while the thyristor is
being replaced.
● Make sure that the surface of the thyristor is not damaged.
4. Push the thyristor from the front against the plastic bolt on the heat sink. Make sure that the
thyristor is correctly seated and centered. Pay attention to the mounting position, especially
the polarity of the thyristor. The adhesive symbols on the clamping pressure plates show the
appropriate information.
5. Tighten the nuts
③
evenly and in small increments, max. 1/4 turn per increment. After each
increment, check whether the open-ended wrench can be removed. As soon as the open-
ended wrench can be removed, the clamping force is correctly set. The inner side of the
groove of the steel bolt can be used as an additional check. When the clamping force is
correctly set, this surface will be flush with the surface of the end plate.
6. Enter the thyristor numbers and the replacement data in the equipment installation log.
The first number on the thyristor label is the thyristor number.
7. Reinsert the TAS board.
8. Reconnect the gate lead. Ensure that the lead is correctly twisted.
9. Screw the fixing screw
①
back in.
10.Re-tighten the fixing screws
②
on the underside.
9.7.8.4
Disconnecting the fiber-optic cables
Tools required
You require a fiber-optic cable cutter (Order No. A5E02615209) to cut the fiber-optic cables to
length.
Maintenance
9.7 Repairs
SINAMICS GL150 6SL38502UM114PA0Z
Operating Instructions Rev.201910281441 EXAMPLE
125
