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Inverter unit hardware
General
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An inverter unit contains the components required to control one motor. These include one
or more inverter modules connected in parallel, together with the necessary auxiliary
equipment such as control electronics, fusing, cabling and switchgear.
ACS880-107LC inverter units range from 355 to 6000 kW in power. The units employ
ACS880-104LC (frame R8i) modules. Up to approximately 800 kW, inverter units consist
of one module only; higher power ratings are achieved by connecting multiple modules in
parallel.
All inverter modules have coated circuit boards as standard.
Inverter module hardware
Frame R8i and multiples
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Frame R8i modules are used to achieve output powers from approximately 350 kW upwards
in single or parallel configurations.
The DC connection of the module is by busbars and located at the top. The motor connection
is via a quick connector at the back of the module that couples when the module is inserted
into the cubicle. Each parallel-connected module is cabled separately to the motor, or
connected by busbars to adjacent modules to reduce the number of cables. It is also possible
to build an AC bus from each module to a separate output cubicle.
Internal du/dt filtering is mandatory with all 690 volt units and all parallel-connected modules.
690 volt modules have internal du/dt filtering as standard.
BCU control unit of frame R8i and multiples
Inverter units consisting of one or several R8i modules employ a separate control unit (BCU)
that contains the BCON board with basic I/Os and slots for optional I/O modules. A fiber
optic link connects the BCU to each inverter module. Any safety circuits utilizing the built-in
Safe torque off functionality are connected to the BCU. The forwarding connector of the
BCU is wired to the inverter module(s).
Operation principle and hardware description 17
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