ABB Triguard SC300E Gebruikershandleiding - Pagina 8
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Triguard SC300E
Figure 2-3 Field output connector J2 pinouts
Connector J3 pin 1c is connected to earth.
All other pins on J3 are connected to field supply return.
THEORY OF OPERATION
The channel output command information from the main processor follows three identical paths
through the MDO16GNS (see Figure 2-4 ), each path is controlled by its own microcontroller in
the common interface. In order to minimise the number of data connections across the 1kV
system-to-field barrier, the channel data are converted to serial form before entering the module
from the common interface. In this manner 16 output channels can be served by just three
paths instead of 48.
The three data streams are each applied to opto-isolators which mark the interface between
the system and field sides of the circuit and provide a system-to-field channel isolation of 1kV.
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MDO16GNS October 2005 – Issue 2