9905-976 | Woodward Overspeed Protection System

Description

The Woodward 9905-976 ProTech 203 Overspeed Protection System monitors prime mover speed using three magnetic pickups, performing individual speed calculations. These calculations are processed through a two-out-of-three hardware vote to detect overspeed conditions, minimizing downtime. The system features a modular design with a fast response time of 40 ms max.

Electrical & Mechanical Specifications

• Input Voltage: 120 Vac/dc (88–132 Vac, 90–150 Vdc)
• Power Consumption: 7.25W
• Dimensions: W482.6 x H310.4 x D142.7 mm
• Keypad/Display: 12 keys and 1 knob per module

Operating Conditions

• Temperature Range: -25°C to +60°C

Protection & Control

• Response Time: 40 ms max
• Overspeed Detection: 2-out-of-3 hardware voting mechanism
• Trip Mechanism: Energize-to-trip

Compatibility & Configuration

• Input: Magnetic pickups (MPU)
• Units: A, B, and C are identical and must be set with identical parameters for proper function

Additional Features

• Standards: CPU Fail Indication