Overview
The Woodward 9907-345 belongs to the ProTech 203 overspeed protection series. It monitors prime mover speed using three magnetic pickups and activates a trip relay during overspeed. With its two-out-of-three voting system, the controller ensures reliable shutdown even if one unit fails.
Key Features
- Three independent speed-sensing channels for redundancy
- Two-out-of-three trip logic improves system safety
- Real-time digital display of actual and highest probe speed
- Online modular replacement possible without shutting down all units
- LED indicators for functional status, trip alarms, and MPU failure
Applications
The ProTech 203 series offers two versions:
- De-energize-to-trip configuration (recommended for safety)
- Energize-to-trip configuration (not advised due to power-loss risks)
Technical Specifications
| Specification | Details |
|---|---|
| Model Number | 9907-345 |
| Series | ProTech 203 Overspeed Protection |
| Enclosure | Type 4 and 4x approved (NA), IP54 rated (EU) |
| Speed-Sensing Units | Three independent units with 2oo3 voting logic |
| Remote Reset | Supported |
| Contact Input | Configurable as remote start or speed sensing |
| Built-In Self-Test | Frequency generator for online testing |
| Key Lock | Prevents unauthorized programming or testing |
| Replacement | Individual subsystems replaceable during operation |
| Alarm and Shutdown Outputs | Separate alarm output and LED trip status |
| MPU Failure Indications | LED signals for sensor or wiring failure |
| MPU Input Frequency Range | 100 Hz to 32 kHz |
| Trip Point Frequency Range | 250 Hz to 25 kHz |
| MPU Input Amplitude | 1 Vrms min (100–25 kHz), 2 Vrms min (25–32 kHz), max 25 Vrms |
| MPU Measurement Input Impedance | 2 kΩ |
| Accuracy | ±(0.05% × Trip Point in Hz + 2 Hz) |
| Operating Temperature | –25 to +60 °C (–13 to +140 °F) |
| Display Operating Temperature | –15 to +60 °C (+5 to +140 °F) |
| Sampling Time | Every 5 ms |
| Total Response Time | ≤40 ms |
| Humidity | MIL-STD-810D, Method 507.2 compliant |
| Vibration | MIL-STD-810D, Method 516.3 compliant |
| Voltage Input (9907-345 configuration) | 24 VDC for Unit A, B, and C |
Voltage Ranges for Model 9907-345
| Part Number | Unit A | Unit B | Unit C |
|---|---|---|---|
| 9907-345 | 24 VDC | 24 VDC | 24 VDC |
Compliance and Safety
The Woodward 9907-345 complies with North American Type 4/4x and European IP54 environmental ratings. It includes strict CPU and MPU monitoring, supporting industry standards for safety-critical turbine overspeed protection.
Details
| Weight | 3.2 kg |
|---|
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