1. Product Overview

Core Functions

• Manages 2 independent electro‑hydraulic servo valve closed‑loop position control loops to drive fuel/steam regulation actuators.

• Supports LVDT/LVDR linear displacement sensor excitation, signal conditioning, valve position feedback acquisition, and high/medium/low selection logic.

• Dual IONet Ethernet interfaces connect the Mark VIe controller and TSVO servo terminal board for distributed I/O control.

• Built‑in WSVO servo driver module provides servo current output, PID closed‑loop calculation, fault diagnosis and status monitoring.

• Supports Simplex / Triple Modular Redundant (TMR) configuration, compatible with Mark VIe safety control architecture, and supports online configuration and diagnosis.

• Integrates local power supply, temperature monitoring, LED status indication, and supports configuration and testing via ToolboxST software.

2. Key Technical Specifications

1. Control & Feedback Specifications

• Servo Channels: 2 independent servo control loops, single pack drives 2 electro‑hydraulic servo valves.

• Feedback Capacity: 3 LVDT/LVDR sensors per channel, total 6 feedback inputs, supports high/medium/low selection voting.

• Control Algorithm: Built‑in closed‑loop PID/position loop control, local real‑time calculation, servo loop update rate approx. 1kHz.

• Redundancy Mode: Supports Simplex and TMR (Triple Modular Redundancy), three‑channel voting, eliminates single‑point failure risk.

• Speed Input: Compatible with active/passive speed sensors, pulse input range 2Hz~14kHz.

2. Hardware & Communication

• Core Architecture: Based on Mark VIe distributed I/O architecture, WSVO servo driver module, Flash + RAM data storage.

• Communication Interfaces: Dual IONet Ethernet (ENet1/ENet2), connects controller and TSVO terminal board.

• Status Indicators: LED indicators (Power, Attn Alarm, ENA1/ENA2 Servo Enable, ENet1/ENet2 Network).

• Power Supply: 24VDC redundant power, built‑in local power module and temperature sensor, over‑temperature protection.

• Mounting: Installed in Mark VIe I/O rack, standard industrial component design, supports hot‑swap and online maintenance.

3. Environmental & Reliability

• Operating Temperature: 0°C to +60°C; Storage Temperature: -40°C to +85°C.

• Protection Rating: IP20 (for installation in control cabinets).

• Certifications: CE, UL, IEC 61010-1 and other industrial safety standards.

• Diagnostics: Power‑on self‑test, real‑time monitoring of channel status, communication, power supply and temperature; fault alarm output and trend recording.

• Testing Functions: Supports manual mode, position ramping, step current testing to verify servo performance.

3. Key Features & Benefits

1. 2‑Channel Precision Servo Control: Single pack realizes independent closed‑loop control for 2 servo valves, precisely controls fuel/steam flow to meet unit load and speed regulation requirements.

2. LVDT Multi‑Feedback Voting: 3 sensor inputs per channel + high/medium/low selection, improves feedback reliability with strong anti‑interference and anti‑drift capability.

3. Distributed Ethernet Architecture: Dual IONet networks enable distributed deployment, reduces wiring and improves system flexibility and anti‑interference performance.

4. Redundant & Highly Reliable Design: Native compatibility with Mark VIe TMR architecture, three‑channel voting, fault isolation, online replacement support to meet continuous operation requirements in power plants.

5. Comprehensive Diagnostics & Maintenance: Full‑status monitoring, intuitive LED indication, ToolboxST configuration/testing, fast fault location and reduced O&M costs.

4. Typical Applications

• Gas Turbines: Closed‑loop servo control of fuel control valves, ratio valves, natural gas regulating valves.

• Steam Turbines: Position control of main steam valves, control valves, extraction valves.

• Combined Cycle Power Plants, Industrial Turbine Units: Servo drive and safety protection control for key actuators.