Siemens 6SL38503UM114PA0Z, Operating Instructions & Installation Instructions

Page: 128 / 150

3. Loosen the clamping screw
④
with the socket wrench
③
.
This releases the heat sink/thyristor assembly. As you do this, the heat sinks and thyristors
move downwards until they are held in a defined position by holding bolts.
Note
The stack is fully released when the lowest heat sink is held by the holding bolt.
4. Remove the thyristor with the gate lead or the diode facing forwards.
The holding bolts and the distances traveled are matched to each other so that you can
easily remove the thyristor from the clamped assembly after releasing the clamping bolt.
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 in the following sequence:
– 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.
– Tighten the clamping screw
④
with the socket wrench
③
until the open-ended
wrench
①
can be easily removed.
The clamping force has been correctly set when the groove of the steel bolt is flush with
the surface of the upper plate.
– Enter the thyristor numbers and the replacement data in the equipment installation log.
The first number on the thyristor label is the thyristor number.
– Reconnect the gate lead. Ensure that the lead is correctly twisted.
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 6SL38503UM114PA0Z
128
Operating Instructions Rev.201910301420 MUSTER