The IS200VAOCH1C is a PCB component designed by GE for their Mark VI system. The MKVI is one of the later “Speedtronic” steam/gas heavy-duty turbine management systems that was released by GE over the course of several decades.
The IS200VAOCH1C mounts into the VME rack and receives digital values over the VME backplane from the controller from the VCMI board. These values are converted to analog output currents and sent to the VAOC’s terminal board where they are measured and then fed back to the VAOC for control. It is important to note the IS200VAOCH1C is a second-generation VAOC board that supports higher load resistance on the first eight output circuits. This allows operation with a 800 Ω load resistance vs. the 500 Ω of the remaining eight output circuits.
The IS200VAOCH1C has several connectors on the board surface, including two backplanes. The board has sixteen relays located on the board near the front right corner. Each of these components includes a relay diagram. The board has several types of integrated circuits on its surface, including oscillating chips, FPGAs (field programmable gate arrays,) and SRAM chips. It has resistors, diodes, and capacitors of different resistance/capacitance, using various materials.
The IS200VAOCH1C has a faceplate attached to the board using three screw connections. The faceplate is home to three LED components that are labeled Run, Fail, and Status. These LEDs are green, red, and orange, respectively.
Alarm states, board configuration, and installation guidelines for the IS200VAOCH1C can be found in GE publication GEH-6421. Manuals and datasheets referencing this board number may also be helpful for guidance during installation or maintenance.
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