ABB ACS880-304LC Series, Hardware Manual, Page: 65 / 178

Connection diagram – 2×D8D, 12-pulse, external charging and pre-magnetizing
The diagram shows 2×D8D modules in a 12-pulse connection with external charging
of the drive. The external charging circuit is combined with the transformer
pre-magnetization circuit. For more information, contact ABB.
In this manual, external charging stands for drive charging circuit outside the supply
unit cubicle.
Supply unit cubicle B External installation (outside supply module
cubicle) A
DC link 6 Medium voltage/low voltage switchboard 1
Supply modules 7 Switchgear including: 2
• Disconnecting device
• Breaker/contactor
AC fuses for protecting supply unit against
short circuit 8 Combined transformer pre-magnetizing cir-
cuit and drive charging circuit 3
360 degrees grounding. See section Selecting
the supply transformer .
9 Supply transformer 4
Overcurrent and short-circuit protection of
input cabling 5
Note: *) Use symmetrical supply cabling to ensure equal current sharing between parallel diode bridges.
Required minimum length of the cables is 5 meters. See section
Input AC cabling (page 60) .
Ground the cable shield 360 degrees at the cable entry (recommendation). For grounding instructions,
see section
Connection procedure (page 66) .
Use a separate PE conductor in addition if the conductivity of the shield does not meet the requirement
for the PE conductor. See
ACS880 liquid-cooled multidrive cabinets and modules electrical planning
instructions (3AXD50000048634 [English]).
For cable selection instructions, see Selecting the power cables (page 60) .
Electrical installation 65
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