Description
The WOODWARD 8237-1243 is a high-performance ProTech-SX safety programmable logic controller (PLC) specifically engineered for critical overspeed protection and equipment safety. This HV/HV (High-Voltage/High-Voltage) panel-mount model is designed to monitor turbine or engine speeds and process safety inputs to initiate rapid shutdowns, ensuring both personnel safety and operational reliability.
Technical Parameters & Datasheet Details
- Manufacturer: Woodward
- Series: ProTech-SX Integrated Overspeed Protection
- Model Number: 8237-1243
- Voltage Configuration: HV/HV (90–264 VAC / 100–150 VDC for both inputs)
- Response Time: ~12 milliseconds
- Speed Range: 0.5 to 32,000 rpm
- Inputs: 2 redundant speed inputs + 7 discrete/analog inputs
- Outputs: 5 configurable relay outputs + 1 speed meter output
- Operating Temperature: -20 to +60 °C
- Ingress Protection: IP56 (when flush-mounted)
- Dimensions: ~267 x 165 x 89 mm
- Certifications: IEC61508 SIL-2, API 670, API 612 compliant
Product Features
⚙️ Advanced Safety Logic: Functions as a stand-alone safety system that monitors for overspeed and acceleration events, issuing shutdown commands to protect steam, gas, or hydro turbines.
🛡️ High-Signal Select: Designed with redundant power inputs; the unit remains fully operational if either or both power sources are available.
⚡ Integrated Health Monitoring: Includes “trip valve” health monitoring and automatic periodic test routines to ensure the system is ready when a safety event occurs.
🖥️ Diagnostic Logging: Features non-volatile memory to log trips, alarms, and overspeed events, which can be viewed via the front panel or the ProTech-SX service tool.
🔌 Rugged Reliability: Built with conformal coating for resistance against sulfur contamination (H2S/SO2), making it suitable for harsh industrial environments.
Frequently Asked Questions (Q&A)
❓ What does “HV/HV” mean for this controller?
It indicates that the device is configured to accept high-voltage power inputs (90–264 VAC or 100–150 VDC) for both power sources, offering high-level voltage protection and stability in industrial power systems.
❓ Can the ProTech-SX operate independently?
Yes, it is a stand-alone safety PLC. It does not require a connection to a larger control system to perform its core safety and shutdown functions.
❓ Is the unit field-repairable?
While the device has modular features and service software for configuration and logging, major repairs or certifications typically require professional service to maintain SIL-2 safety compliance.
❓ How does it handle speed sensor inputs?
It features a special MPU (Magnetic Pickup) open-wire detection circuit to validate that speed sensors are properly connected, ensuring the integrity of speed data before and during operation.
Recommended Woodward Series Inventory
- 8237-1242 (ProTech-SX, HV/LV)
- 8237-1597 (ProTech-GII)
- 8440-2150 (LS-5 V2)
- 8440-2050 (easYgen-3400XT-P1)
- 8440-2051 (easYgen-3500XT-P1)
- 8440-2100 (LS-521)
- 8440-2101 (LS-522)
- 8440-1030 (LS441B)
- 8440-1006 (LS445B)
- 8440-1846 (GCP-32)
