ABB ACS880-204LC, Руководство по оборудованию

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￭ Control electronics
Control unit
One BCU control unit is required per IGBT supply unit. The type of the control unit depends
on the number of IGBT supply modules as shown below. The control unit is delivered with
a memory unit containing the ACS880 IGBT supply control program.
Ordering code Control unit type Frame size
3AXD50000002937 BCU-02 R8i
3AXD50000015806 BCU-12 2×R8i…4×R8i
Note:
Fiber optic communication with another control unit (such as that of the inverter unit) requires
an RDCO-0x DDCS communication module. For more information, see
RDCO-0x DDCS
communication option modules user's manual (3AFE64492209 [English]).
For more information on optional modules, see appropriate option module manual.
Fiber optic cables
Each frame R8i module is connected to the control unit with a pair of fiber optic cables.
The following kits, each consisting of a pair of plastic fiber optic cables, are available from
ABB:
Ordering code Kit type designation Length
58988821 NLWC-02 2 m
58948233 NLWC-03 3 m
58948250 NLWC-05 5 m
58948268 NLWC-07 7 m
58948276 NLWC-10 10 m
Auxiliary measurement unit (BAMU)
BAMU is a measurement unit for precise voltage and current measurements.
Ordering code Unit type Frame size
3AXD50000045879 BAMU-12C All
For more information, see BAMU-12C auxiliary measurement unit hardware manual
(3AXD50000117840 [English]).
Note: You must have BCU-12 control unit to have enough fiber optic connections if you use
BAMU auxiliary measurement unit for 2×R8i IGBT supply modules.
Weak supply networks: In weaker supply networks with a short-circuit ratio less than 8, it
is highly recommended to add an additional BAMU auxiliary measurement unit to the drive.
In such kind of networks, there is risk of unnecessary DC overvoltage tripping due to
disturbances caused by probable high voltage THD in the supply voltage. Short-circuit ratio
is defined as the supply network’s apparent short-circuit power
S
k,net
related to the drive’s
nominal apparent power S
n
( S
k,net
/ S
n
< 8 ).
138 Ordering information