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36 Electrical installation
Motor connection diagram (with option +H366)
￭
With option +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.
Inverter unit cubicle(s)
The recommended cable types are given in chapter Technical data.
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.
Procedure
￭
Refer to the drawings below.
WARNING!
Obey the instructions in Safety instructions for ACS880 liquid-cooled multidrive
cabinets and modules (3AXD50000048633 [English]). If you ignore them, injury
or death, or damage to the equipment can occur.
PE
W2
V2
U2
Bridging busbars
W2
V2
U2
M
W1
V1
3~
U1
PE
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