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64 Electrical installation
Connection diagram – 2×D8D, 6-pulse, external charging and pre-magnetizing
The diagram shows 2×D8D modules in a 6-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.
A
External installation (outside supply module
cubicle)
1
Medium voltage/low voltage switchboard
2
Switchgear including:
• Disconnecting device
• Breaker/contactor
3
Combined transformer pre-magnetizing cir-
cuit and drive charging circuit
4
Supply transformer
5
Overcurrent and short-circuit protection of
input cabling
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
Ground the cable shield 360 degrees at the cable entry (recommendation). For grounding instructions,
see section
Connection procedure (page
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
B
Supply unit cubicle
6
DC link
7
Supply modules
8
AC fuses for protecting supply unit against
short circuit
9
360 degrees grounding. See section
the supply
66).
Selecting the power cables (page
transformer.
Input AC cabling (page
60).
60).
Selecting
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