Operation; Figure 1 Block Diagram -48V Fed Converter Shelf - ABB CPS2400U Product Manual

Operation

-48V power input is distributed in an A and B redundant fashion to each of the converter cards and the
alarm card. There are two +/-190V circuits on each converter card. The circuits both boost the voltage
and limit the current as prescribed by UL60950-21 and GR-1089-CORE.
Warning: Ground faults or short circuits on the output do not permanently disconnect the output. The
converter circuit tests the line every 4 seconds and will re-energize if the wiring fault is
cleared.
A serial communication bus links each converter to an alarm card at the end of each shelf.
The alarm card provides major and minor form C contacts, manages the converters and relays
information to an optional system controller using Galaxy Protocol over an RS485 bus. Up to 24 shelves
can be controlled and monitored by one system controller. The controller is WEB and SNMP capable.
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Figure 1 Block Diagram -48V Fed Converter Shelf