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Front-End Units
The front-end units convert a mains AC voltage and current
into a DC voltage and current. The power is transferred from the
mains to a common DC bus (and, in certain cases, vice versa).
The SPA (active front end) unit is a bidirectional
(regenerative) power converter for the front end of a common DC
bus drive line up. An external LCL filter is used at the input.
This unit is suitable in applications where low mains harmonics
are required. The SPN (non-regenerative front-end) unit is a
unidirectional (motoring) power converter for the front-end of a
common DC bus drive line-up. The device operates as a diode
bridge using diode/thyristor components. A dedicated external
choke is used at the input. The unit has the capacity to charge
a common DC bus. This unit is suitable as a rectifying device
when a “normal” level of harmonics is accepted and no
regeneration to the mains is required.
Inverter Unit
The SPI9000 Inverter Unit is a bidirectional DC-fed power
inverter for the supply and control of AC motors. The inverter
is supplied from a common DC bus drive line-up. A charging
circuit is needed in case a connection to a live DC bus is
required. The DC side charging circuit is integrated up to 75 kW
(FR4 – FR8) and external for higher power ratings (FI9 – FI14).
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