Siemens SIMOTRAS 6SG7050, Operating Instructions Manual

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Maintenance 01.04
13-8
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
13.2.3 Replacement of thyristor modules on D400 / 60 – 680 Mre converters
The thyristor modules are mounted by means of self-tapping screws. When a module is replaced,
the support surfaces on the heatsink must be cleaned and a new layer of thermo-lubricant applied
to the thyristor module. To fix the modules always use screws with a metric thread of the same
length as the original screws and fixing elements (washer and spring lock washer). When screwing
the modules to the busbars, also use screws with a metric thread and the same length as the
original screws and fixing elements (washer and spring lock washer).
NOTICE
The layer of thermo-lubricant (silicone-free, type H-T-C made by Electrolube) applied to the modules must
be so thin and even that the baseplate is still clearly visible underneath!
Module design
Tightening torque on module: 3,5 Nm
Tightening torque of current terminals: 3 Nm
Tightening torque on module: 3,5 Nm
Tightening torque of current terminals: 5 Nm
Tightening torque on module: 6 Nm
Tightening torque of current terminals: 12 Nm
Tightening torque on module: 6 Nm
Tightening torque of current terminals: 15 Nm