Woodward | 8200-204 | ProTech 203 Electronic Overspeed Protection System

Description

Model 8200-204 is an advanced digital overspeed trip device from Woodward’s ProTech 203 series. Its three independent units are connected in a two-out-of-three voting configuration so that if any single unit fails, the ProTech system will still provide the correct output. Designed to protect industrial prime movers such as gas, steam, and hydro turbines, the system continuously monitors speed via three independent magnetic pickups, ensuring maximum reliability and fail-safe operation.

📊 Technical Datasheet Parameters

⚙️ Operating Standards & Installation Methods

• Handling Precautions: Always follow standard electrostatic discharge guidelines when touching internal circuits or replacing modules. Ensure main power is disconnected before performing any wiring.
• Mounting Integration: Secure the lockable enclosure to a rigid, vibration-free structural panel or cabinet wall, ensuring proper clearance for airflow, terminal access, and cable entry.
• Wiring Verification: Confirm that all incoming 220 Vac power feeds, magnetic pickup sensor cables, and output trip relays are properly shielded, grounded, and fastened securely to their respective terminal blocks.

🔌 Strict Startup and Shutdown Sequence

• Pre-Power Inspection: Inspect all sensor clearances, external emergency stop configurations, and power line terminations to verify system readiness prior to energization.
• Startup Sequence:
  1. Energize the 220 Vac primary power input supplying the system modules.
  2. Observe the front-panel display and LED indicators during the automated internal self-diagnostic routine.
  3. Unlock the enclosure using the key switch to adjust configuration parameters if necessary, then return it to monitoring mode.
  4. Arm the primary safety trip loop once all three voting channels report normal operational status.
• Shutdown Sequence:
  1. Execute a controlled ramp-down or normal operational shutdown of the prime mover if performing routine maintenance.
  2. Initiate a manual trip test or let the protective logic drop out the trip outputs during emergency procedures.
  3. Disconnect the 220 Vac power supply feeds only after the turbine rotor has come to a complete physical standstill.

💡 Product Usage Guide & Maintenance Best Practices

• Online Testing Feature: Use the integrated frequency generator to test individual voting modules sequentially while the prime mover remains fully online and operational.
• Security & Diagnostics: Keep the front-panel enclosure locked to restrict unauthorized parameter modifications. Regularly check event and trip logs via the local digital interface.

❓ Frequently Asked Questions (Q&A)

• Q: What happens if one of the three units fails during operation?
  • A: Because the three units are configured in a two-out-of-three voting architecture, if any single unit fails, the system will still process signals correctly and maintain proper output without causing an unwarranted shutdown.
• Q: How does the system handle sensor inputs?
  • A: It samples prime mover speed independently through three separate magnetic pickups connected to its individual speed-sensing channels.
• Q: Can modules be tested without shutting down the turbine?
  • A: Yes, the built-in frequency generator allows operators to test individual units online while the remaining channels continue to safeguard the equipment.

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