ABB ACS880-304LC Series, Hardware Manual, Page: 23 / 178

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Overview diagram – 2×D8D, 6-pulse, external charging and
pre-magnetizing
The diagram shows a supply unit with two D8D modules in a 6-pulse connection. The
system has an external charging circuit combined with a transformer pre-magnetization
circuit. For more information, contact ABB.
Note: *) Each module must have its own input AC cable with the minimum length of 5 meters. Use
symmetrical supply cabling to ensure equal current sharing between parallel diode bridges.
External installation (outside supply module cubicle) A
Supply module cubicle B
Medium voltage/low voltage switchboard 1
Switchgear including: 2
• Disconnecting device
• Breaker/contactor
Combined transformer pre-magnetizing circuit and drive charging circuit 3
Supply transformer 4
Overcurrent and short-circuit protection of input cabling 5
AC fuses for protecting supply unit against short circuit
1)
6
Diode supply modules 2) 7
DC link 8
1)
Available through ABB or third party
2)
Available through ABB
Operation principle and hardware description 23