The GE IS220PSVOH1A is a Servo Control Pack part of the Mark VIe series, designed for steam and gas turbine control systems. It acts as an electrical interface connecting a TSVO servo terminal board to 1-2 I/O Ethernet networks, using the WSVO servo driver module to control two servo valve position loops. Critical for precise turbine actuation, it integrates seamlessly into GE's Mark VI and Mark VIe architectures.

• Servo Control Function: Manages two servo valve position loops via the WSVO driver module, enabling accurate turbine control in steam and gas applications.
• Connectivity & Hardware: Equipped with dual Ethernet ports for network communication, a CPU board with flash memory, RAM, input power connectors, local power supply, and an internal temperature sensor.
• Diagnostics & Indicators: Front faceplate features LEDs for Ethernet status, Power, Attn, and ENA1/2; includes an unused infrared port for potential local diagnostics.
• Reconfiguration Flexibility: Supports auto-reconfiguration when replaced; manual reconfiguration required after terminal board changes.
• Testing Capabilities: Allows servo performance testing via manual actuator stroking, position ramping, or step current, with trend recorders capturing stroke irregularities for troubleshooting.