Master Lock XR20 Manual de Serviço Página 106

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The phase detector senses input line voltage on each phase. Upon detection of a problem, the
control board is signaled to shutdown the system. The control board, which is referenced to earth
ground, contains optically isolated amplifiers to sense output voltage and current. This circuitry
allows the output to be referenced ±1000 Vdc above earth ground.
The display board contains light-emitting diodes for displaying diagnostic conditions and
provides an interface for meters and switches.
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