ABB ACS880-17, Hardware Manual

Page: 103 / 244

Electrical installation 103
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Connection diagram (with H366)
With H366, the output busbars of the inverter modules within the same cubicle
are connected by bridging busbars. The bridging balances the motor current between the
modules, which allows more cabling options. For example, it is possible to use a number
of cables that could not otherwise be evenly distributed between the inverter modules.
WARNING! The bridging can carry the nominal output of one inverter module. In
case of three parallel modules, ensure that the load capacity of the bridging is not
exceeded. For example, if the cabling connects to the output busbars at one
module only, use the module in the middle.
Note: The +H366 option only interconnects the outputs of inverter modules within the
same cubicle, not modules installed in different cubicles. Therefore, when the drive has
more than three inverter modules, make sure that the load is distributed evenly between
the modules:
•
In case of two inverter cubicles of two modules, connect the same number of cables to
each cubicle.
•
In case of one inverter cubicle with three modules and another with two, each cubicle
requires a number of cables proportional to the number of modules within. For
example, connect three out of five (or six out of ten, etc.) cables to the cubicle with
three modules, the remaining two out of five (four out of ten) cables to the cubicle with
two modules.
Inverter unit cubicle
The recommended cable types are given in chapter Guidelines for planning the electrical installation .
PE
U2
V2
W2
U2
V2
W2
M
3~
U1
W1
V1
PE
Bridging busbars
(H366)