Description
The ProTech 203 Model 8200-202 digital overspeed trip device is an advanced safety system designed to sense prime mover speed through three independent magnetic pickups (MPUs). Engineered for critical industrial rotating machinery, it provides reliable protection by preventing hazardous overspeed conditions. The unit incorporates robust fault-tolerant architecture and diagnostic capabilities to ensure maximum availability and safety compliance in harsh industrial environments.
⚙️ Product Datasheet & Technical Parameters
• Brand: Woodward (ProTech 203)
• Model Number: 8200-202
• Series: ProTech Series Safety Systems
• Product Name: Digital Overspeed Trip Device
• Origin: United States
• Production Status: Active / Industrial Standard
• Dimensions: Standard Enclosure / Panel Mount Configuration
• Weight: Approximately 1.5 kg
• Country of Origin: United States
• Power Consumption: 24 VDC (Nominal)
🔌 Operating Guidelines and Usage Methods
The ProTech 203 Model 8200-202 is mounted in control panels near the prime mover or within central control rooms. Proper installation requires connecting all three magnetic pickup (MPU) sensors with shielded cables properly grounded at one end to prevent electrical noise interference. Operators configure safety setpoints, trip parameters, and voting logic using the local user interface or configuration software. Routine testing procedures can be performed online to verify the integrity of the voting logic and trip circuits without shutting down the machinery.
🔄 Power-On and Power-Off Sequence
Power-On Sequence: First, verify that all three MPU sensor connections, external safety interlocks, and wiring are secure. Next, energize the 24 VDC primary and auxiliary power supply inputs. Allow the processor to complete its internal self-tests and diagnostic checks. Once system health is confirmed on the display and status indicators, arm the output trip relays.
Power-Off Sequence: First, inhibit or bypass the critical trip output signals if maintenance requires powering down while the machine is offline, or perform the shutdown during a scheduled unit outage. Next, disconnect external sensor input lines if servicing local hardware. Finally, cut the 24 VDC supply voltage to the device.
📝 Product Description and Operation Manual
The device continuously monitors rotational speed by processing frequency signals received from three independent MPU sensors. It implements a 2-out-of-3 voting architecture to process speed data, effectively eliminating nuisance trips caused by single-sensor or single-channel failures while ensuring high reliability during actual overspeed events. Real-time speed metrics, alarm conditions, and system health status are shown on the integrated digital display. In the event of an overspeed condition, the unit instantly commands the trip output relays to shut down the fuel or steam valves.
💡 Frequently Asked Questions (Q&A)
Q: Why does the unit display a dual or single MPU failure alarm?
A: This happens when one or more magnetic pickup sensors fail, have improper air gaps, or suffer from loose wiring connections. Inspect the sensor terminals and verify the gap distance relative to the target gear.
Q: How does the 2-out-of-3 voting logic function?
A: The system reads speed inputs from all three MPU sensors simultaneously. A trip command is initiated only when at least two of the three channels independently detect that the speed has crossed the pre-configured overspeed threshold.
Q: Are configuration settings retained during a power failure?
A: Yes, all safety setpoints, calibration parameters, and configuration data are stored in non-volatile memory, ensuring they are preserved when power is interrupted.
Q: Can the ProTech 203 be tested while the turbine is running?
A: Yes, the system supports online proof-testing features that allow operators to verify individual channel responses and relay operations safely while the machine remains in service.
🚀 Recommended Woodward ProTech Series Models
- 8200-200
- 8200-201
- 8200-203
- 8200-204
- 8200-205
- 8200-206
- 8200-207
- 8200-208
- 8200-209
- 8200-210
