8
Basic Selection
3ADW000197R0101 DCS800-R Sel e a
tive mode with maximum 4 thyristors in parallel. In case there are more than 4 thy-
ristors in parallel per current direction there is no standard kit prepared; please con-
tact your local ABB organization.
To selecting the Rebuild kit, first the HARDWARE CONDITIONS must be checked
to become aware of critical limitations. If this is not a problem the DRIVE´S
DESIGN CONDITIONS will give some guidelines for the overall design. After that a
decision must be made for the functionality of the interface between the kit and the
Programmable Logic Controller. Depending on that, the Rebuild kit´s type code
can be fixed by using the type designations listed on the next pages. Afterwards
please check if all conditions are fulfilled as listed in CONDITIONS CAUSED BY
THE APPLICATION.
Hardware conditions
If a Rebuild kit is taken into consideration, the items listed afterwards will give
some help to decide whether a Rebuild kit or a converter module / enclosed con-
verter is the better solution.
- Before an existing DC power part is upgraded by the Rebuild kit, it should be
checked if a brand new module may be easier to install or may be a more reli-
able solution (tested power stack).
- The existing power bridge should be build up by max. 4 thyristors in parallel per
current direction (solution for more thyristors in parallel on request). It doesn't
matter whether the bridges have the same number of thyristors in parallel.
- The supply voltage used for the existing thyristor bridge has to be lower than
990 V because of the devices used to interface the electronics to the thyristors
(higher mains voltages on request).
- The thyristors actually used should be of a disk type. One single thyristor
bridge should be capable of running around 1000 A or more, if the converter is
built up by more than one bridge in parallel. If a single bridge cannot give this
current a brand new converter is probably the more economical solution.
- The ratio between reverse / forward blocking voltage of the thyristors and the
nominal line voltage should be factor 3 or higher the blocking voltage has to be
measured on a thyristor test stand if the actual blocking voltage gives a lower
ratio the thyristor(s) need to be replaced. In such a case, please check if a
complete new converter may be more economical.
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