About the IC3600KVSA1C
The Zero Speed Relay Board marked IC3600KVSA1C is a component designed to fit into the Mark I/Mark II Speedtronic series for steam/gas turbine management. The philosophy used in designing the Speedtronic system focused on minimizing machine shutdowns resulting from control system failures. Therefore, a large degree of redundancy was worked into the design, with the failure of one redundant system causing annunciation (alarming) but not the shutdown of the system. Where full redundancy was not practical, the designers used one functional system to back up another. For example, the temperature control will control the turbine if the speed control fails.
The IC3600KVSA1C is built with a single relay placed near the center of the board. This is a reed relay. This type of relay tends to be fast, lightweight and small. The relay is marked on its top surface with the GE logo, with a relay diagram, and with the codes 68A997168A02 abd NP68A997229 P2. The relay has a rating of 28 VDC and 50 VA. Several colored wires (green/red/black/yellow) run from one end of the relay and connect to the line of right-angled pins placed along the edge of the board.
The IC3600KVSA1C is built with five transistors. Q1, Q2, and Q3 are one type of transistor and Q4/Q5 another type. The board has one integrated circuit. The board has a single trim potentiometer. It uses ceramic resistors as well as carbon composite resistors. Capacitors may be made of ceramic material or may be aluminum electrolytic capacitors. The board communicates with the Speedtronic system via wiring attached to the line of pins on its edge.
