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

Twelve-pulse connection, two DSU modules in parallel

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Notes:
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.
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Fuses are not required if the input power line is constructed of busbars that withstand the transformer short circuit current,
or the input cables will be protected by some other means, eg, by a circuit breaker at the primary side of the transformer.
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No bridging (connecting 1L1 to 2L1, 1L2 to 2L2, and 1L3 to 2L3) is allowed!
There are two separate incoming cubicles – one for terminals 1L1, 1L2 and 1L3, the other for 2L1, 2L2 and 2L3 – if
a) the unit is equipped with main breakers, b) the drive is UL listed, or c) the incoming cubicle is designed for a busbar
connection.
The cable lead-through details (number and size of holes), and cable connection details (number and dimensions of
busbars, tightening torque) are given in chapter
PE PE
1L1
1L2
1L3
2L1
2L2
2L3
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Incoming cubicle
Technical
Switching, breaking,
disconnecting and
grounding devices
Switching, breaking,
disconnecting and
grounding devices
Supply module cubicle
data, section Input power connection.
85
Electrical installation