Raio-01; Charging Circuit; Safety Functions - ABB ACS800 Series Hardware Manual

also contains a data logger for collecting and storing real-time data from the module
power stages to help fault tracing and analysis.

RAIO-01

Analog Expansion Module (RAIO) is an extended module for the RMIO board. The
inlet air temperature of ACU can be read through RAIO.

Charging circuit

Resistor R1, fuses F15 and contactor K2 form a part of the charging circuit located
on the slide-out frame. Charging circuit is required during the start-up procedure to
avoid high in-rush current, which can be dangerous for wind turbine converter and its
components. After receiving the start command, the grid-side converter closes the
charging contactor which connects the intermediate DC link capacitors to the AC
supply via the charging resistors. The intermediate DC link voltage rises and when it
is high enough, the main contactor/breaker is closed and the charging contactor is
opened. The contactors are controlled by the grid-side converter control board
(RMIO) via relay outputs RO1 and RO3.

Safety functions

ACU cabinet contains special circuits for securing the start-up conditions and
monitoring the shutdown process of the converter.
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Hardware description