Woodward 8200-205 ProTech 203 Overspeed Protection System

Configured for overspeed detection in turbine control systems, the Woodward 8200-205 (8200-205 Overspeed Protection System) provides direct electrical execution of triple modular redundant (TMR) speed sensing and trip logic.

Hardware Specifications

Actuator Loop Feedback Response and Load Management

The 8200-205 utilizes a TMR architecture requiring three independent magnetic pickup inputs to monitor prime mover rotational frequency. The system performs continuous monitoring for overspeed conditions and loss-of-signal scenarios, utilizing de-energize-to-trip logic for fail-safe operation. The controller supports internal self-diagnostics to detect CPU and MPU failures, reporting status via the integrated display and keypad interface. To maintain signal integrity within the sensing loops, cable runs should be minimized, and shielding must be applied to prevent electromagnetic interference from inducing false speed readings. The operational environment must comply with IP54 and NEMA 4/4X standards to ensure the longevity of internal electronics against moisture and dust ingress.

Frequently Asked Questions

Q: Can the operational modes (PROGRAM vs. MONITOR) be accessed without the physical key?

A: No. Mode switching is strictly hardware-locked to prevent unauthorized configuration changes. Key lock access is mandatory for any adjustment to the internal protection parameters or turbine start/reset methods.

Q: How does the system handle a loss-of-signal condition in one of the three magnetic pickup channels?

A: The ProTech 203 system continually compares inputs across the three channels. A loss-of-signal in a single channel triggers an indication, allowing the system to maintain protection logic while identifying the faulty input sensor for maintenance intervention.

Field Installation Guidelines

• Mounting: Ensure the enclosure is mounted on a rigid, vibration-isolated surface. Adhere to NEMA 4/4X standards for enclosure integrity, utilizing appropriate cable glands for all conduit entries.
• Wiring: Connect the three magnetic pickups to the dedicated sensing inputs. Use high-quality shielded twisted-pair cabling for all speed signals, ensuring the shield is terminated to the common ground bus within the protection cabinet.
• Configuration: Upon installation, verify the selected turbine start method (separate start/reset or combined start/reset) according to the site-specific control requirements defined in manual 85205.
• Testing: Perform a low-speed simulation test prior to turbine startup to verify that the trip-point frequency ranges (250 Hz to 25 kHz) are correctly calibrated to the specific prime mover's speed characteristics.