Description

Woodward 8237-1369

Woodward 8237-1369 is an overspeed protection device in the ProTech-GII series, primarily used for equipment such as steam, gas, and hydraulic turbines to ensure their operational safety.

Technical Parameters

• Dimensions: 330mm×445mm×159mm.
• Electromagnetic Compatibility: Complies with EN 61000-6-4 (Emission) and EN 61000-6-2 (Immunity) standards.
• Enclosure Type: IP56 protection level when properly installed.
• Input Voltage: High voltage nominal values: 115V AC/240V AC/125V DC; low voltage nominal value: 24V DC, with DC reverse polarity protection.
• Operating Temperature: -20°C to +60°C (-4°F to +140°F).
• Relative Humidity: Up to 95% (non-condensing).
• Storage Temperature: -20°C to +65°C (-4°F to +158°F).
• Weight: 23 pounds before shipment.
• Speed Reading: 4-20mA current signal, proportional to the measured speed.
• Communication Protocol: Supports Modbus communication protocol.

Working Principle

• Overspeed Detection: Continuously monitors the turbine speed through devices such as magnetic sensors, converting the speed signal into an electrical signal (4-20mA current signal) for processing and analysis. When the detected speed exceeds a pre-set limit, the device triggers a safety shutdown procedure to prevent equipment damage or even catastrophic failures caused by overspeed.
• Multiple Protection Mechanisms: Adopts a three-module design (A, B, and C modules) with dual-redundant trip relays using a "two-out-of-three" voting architecture, meaning at least two relays must trip to initiate the shutdown procedure, reducing the risk of false trips and improving system reliability. Additionally, some models may provide three independent non-voting trip relays with individual alarm relays for more precise control. The device also features MPU detection and regularly performs self-checking procedures to ensure normal operation of all modules.

Operation Guide

• Parameter Configuration: Set parameters such as overspeed thresholds and response time via the front-panel 15-key keyboard or external communication interfaces (e.g., Modbus) according to the specific characteristics and operational requirements of the turbine.
• Status Monitoring: View the current turbine speed, device operating status, and alarm information through the front-panel display or connected monitoring system.
• Routine Maintenance: Regularly inspect the device for physical damage or loose connections, clean dust from its surface, and perform functional tests at specified intervals to ensure normal operation.

Common Faults and Solutions

• False Overspeed Alarms: May be caused by faulty speed sensors, improper installation positions, or unreasonable parameter settings. Solutions include checking whether the sensor is damaged and replacing it if necessary; adjusting the sensor installation position to ensure accurate speed detection; and re-evaluating and adjusting parameters such as the overspeed threshold.
• Communication Failures: May result from poor communication line connections, incorrect communication protocol settings, or module failures. Check if communication lines are properly plugged in and undamaged; confirm that communication protocol settings match those of the connected device; if a module failure is suspected, contact professional maintenance personnel for repair or replacement.
• Device Fault Indicator Light On: May be due to internal circuit failures, power supply issues, or abnormalities in a module. First, check if the power supply is normal (e.g., whether the voltage is within the specified range); then refer to the equipment manual to check the specific meaning of the fault code and carry out further troubleshooting and repairs as prompted, such as replacing the faulty module.