Twelve-Pulse Connection, Two Dsu Modules In Parallel - ABB ACS800 Hardware Manual

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Twelve-pulse connection, two DSU modules in parallel

L1
L2
L3
L1
L2
L3
Notes:
• No parallel cabling (for each module) is shown here.
It is also possible to connect all input power terminals of module 1 to the transformer Y-output and module 2 to the
transformer D-output. Note, however, that then the two bridges inside a single module do not form a 12-pulse
connection any more. This means that the benefits of the 12-pulse connection are not available during a temporary
operation with one module out of use (eg, for maintenance).
• Each input terminal of the supply modules must be fed through a dedicated fuse. The fuses are specified in
data.
• The secondaries of the transformer must not be grounded.
• When the same 12-pulse transformer is used to supply more than one module, connect the DC outputs of all modules
to a common DC link. Separate links will cause current unbalance fault trips due to circulating currents between the
modules.
)
* Contactors are optional.
Electrical installation
PE
PE
L11
L21
L31
L12
L22
L32
L11
L21
L31
L12
L22
L32
)
*
)
*
Technical