02.00 Maintenance
SIEMENS AG 6RX1700-0AD76 13-7
SIMOREG DC Master Operating Instructions
13.2.2 Replacement of PCBs
WARNING
PCBs may be replaced only by properly qualified personnel.
PCBs must not be removed or inserted when the power supply is connected.
Non-observance of the safety instructions can result in death, severe personal injury or
substantial property damage.
CAUTION
PCBs contains electrostatically sensitive devices. Before touching a PCB, the person carrying
out the work must himself be electrostatically discharged. The simplest way of doing this is to
touch an electrically conductive earthed object, e.g. socket outlet earth contact.
13.2.3 Replacement of thyristor modules in converters up to 1200A
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 used 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 and boards, also use screws with a metric thread and the same length
as the original screws and fixing elements (washer and spring lock washer).
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