Planning the electrical installation
32
3ADW000194R0611 DCS800 Hardware Manual f us
Conclusion for the field supply
Basically, similar conditions apply for both field supply and armature-circuit supply.
Depending on the power converter used (half-controlled bridge, fully controlled 4-
quadrant bridge), some of the fault sources may not always be applicable. Due to
special system conditions, such as supply via an autotransformer or an isolating
transformer, new protection conditions may additionally apply.
The following configurations are very often used:
In contrast to the armature-circuit supply, fuses are never used on the DC side for
the field supply, since a fuse trip might under certain circumstances lead to greater
damage e.g. (small, but long-lasting overcurrent; fuse ageing; contact problems;
etc.).
Semiconductor fuse F3.1 (super-fast acting) should be used, if conditions similar to
those for armature-circuit supply (4-Q operation) are to apply, like for example
protection of the field supply unit and the field winding.
Configuration for field supplies
The F3.2 and F3.3 fuse types serve as line protectors and cannot protect the field
supply unit. Only pure HRC fuses or miniature circuit-breakers may be used.
Semiconductor fuses would be destroyed, for example, by the transformer’s starting
current inrush.
Configurations for field supplies
2
F3.1
ND30 /
built-in
F3.3
2
2
F3.2
F3.1
F3.1
FF_ASP_b.dsf
ND30 /
built-in
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