WOODWARD | 8237-2600 | ProTech-GII Overspeed Protection Device

Product Description

The Woodward 8237-2600 is a ProTech-GII overspeed protection device designed to monitor turbine speed and initiate a protective trip when configured overspeed or acceleration limits are exceeded. It is the preferred panel-mount replacement model for the earlier 8237-1600 configuration.

The ProTech-GII uses three independent protection modules with a 2-out-of-3 voting architecture. Each module receives its own speed input, processes the signal independently, and contributes to the voted trip decision. This arrangement helps reduce the risk of a spurious trip while maintaining protection against dangerous turbine overspeed conditions.

The 8237-2600 configuration features high-voltage/low-voltage power options, voted trip relays, and voted speed inputs. It is suitable for turbine protection applications where independent speed monitoring and safety-related shutdown functions are required.

Product Parameters

• Brand: Woodward
• Model: 8237-2600
• Product Series: ProTech-GII
• Product Name: Panel-Mount Overspeed Protection Device
• Device Type: Triple-modular-redundant turbine protection system
• Protection Function: Overspeed and over-acceleration protection
• Architecture: Three independent modules, 2-out-of-3 voting
• Speed Inputs: Three independent input channels
• Input Sensor Types: Magnetic pickup or compatible proximity probe, subject to system configuration
• Relay Configuration: Voted trip relays
• Power Configuration: HV/LV
• High-Voltage Supply: 90–264 VAC or 100–150 VDC
• Low-Voltage Supply: 18–32 VDC
• Speed Range: 0.5–32,000 rpm, depending on configuration
• Safety Certification: SIL 3 capability under applicable installation and certification requirements
• Place of Manufacture: Woodward manufacturing facility; confirm from product label
• Product Status: Preferred replacement model for 8237-1600
• Dimensions: Confirm from the installed panel and product revision
• Weight: Confirm from the actual unit and shipping package
• Country of Origin: Refer to the product nameplate
• Discontinued: Not identified as the non-preferred predecessor; verify current supply status with Woodward

 

Installation and Commissioning

1. Confirm the complete part number, hardware revision, and power-supply configuration before installation.
2. Verify that the panel cutout, mounting arrangement, grounding, and environmental conditions meet the equipment requirements.
3. Check each speed sensor and its wiring independently. Confirm signal polarity, cable shielding, and sensor clearance where applicable.
4. Connect the HV and LV power circuits only to their specified terminals and verify supply voltage before energizing.
5. Check trip-relay wiring, alarm circuits, and connections to the turbine shutdown system against the approved drawings.
6. Configure the speed reference, overspeed trip setpoint, acceleration limits, and other protection parameters in accordance with the turbine protection design.
7. Perform the manufacturer’s prescribed channel, voting, alarm, and trip-function tests before returning the turbine to service.
8. Record configuration values, test results, firmware information, and commissioning approval.

 

Daily Maintenance and Care

• Review channel status, alarm indications, and diagnostic messages during routine inspections.
• Check for loose terminals, damaged wiring, contamination, moisture, and abnormal panel temperature.
• Confirm that all three speed channels report plausible and consistent readings.
• Inspect sensor cables and shielding for electrical interference or mechanical damage.
• Review trip and alarm event records after any abnormal operating condition.
• Keep configuration backups and maintenance records in a controlled location.
• Perform proof testing at the interval specified by the safety lifecycle plan and applicable Woodward documentation.

 

Troubleshooting and Common Problems

1. Speed Signal Missing

• Inspect the magnetic pickup or proximity probe and its cable.
• Check sensor installation, wiring continuity, and terminal connections.
• Compare the readings from all three channels to identify an isolated sensor or wiring fault.

2. Speed Readings Are Unstable

• Inspect cable shielding, grounding, routing, and proximity to high-current conductors.
• Check sensor clearance and mechanical condition.
• Verify that the sensor type and input configuration are correct.

3. Alarm or Channel Fault

• Review the module diagnostic indication and event records.
• Check the affected channel’s power supply, sensor input, and internal status.
• Replace or service a module only after confirming the fault and checking hardware compatibility.

4. Unexpected Trip

• Review the recorded speed values and trip events from all three modules.
• Check the configured trip setpoint and acceleration limits against approved settings.
• Inspect the voted relay circuit and downstream shutdown wiring.
• Do not bypass the protection function to keep the turbine running.

5. Device Does Not Power Up

• Measure the HV and LV supplies at the specified terminals.
• Check protective devices, terminal connections, and supply polarity where applicable.
• Confirm that the installed power configuration matches the unit’s nameplate.

 

Safety Precautions

• Installation, configuration, and testing must be performed by qualified turbine-control or instrumentation personnel.
• Isolate electrical power and follow site lockout/tagout procedures before wiring or servicing.
• Never change overspeed trip settings without formal engineering authorization.
• Do not bypass, defeat, or disable the turbine overspeed protection system during normal operation.
• Verify the complete shutdown chain and trip logic using an approved test procedure.
• Confirm the exact model, revision, wiring, and certification requirements before replacing an existing protection device.

 

Recommended Woodward Models

1. 8237-1600 – Earlier ProTech-GII panel-mount HV/LV model with voted relays and voted inputs.
2. 8237-1601 – Panel-mount HV/HV version with voted relays and voted inputs.
3. 8237-1598 – Panel-mount HV/LV version with independent relays and voted inputs.
4. 8237-1599 – Panel-mount HV/HV version with independent relays and voted inputs.
5. 8237-1594 – Bulkhead HV/LV version with independent relays and voted inputs.
6. 8237-1595 – Bulkhead HV/HV version with independent relays and voted inputs.
7. 8237-1596 – Bulkhead HV/LV version with voted relays and voted inputs.
8. 8237-1597 – Bulkhead HV/HV version with voted relays and voted inputs.
9. 8237-2594 – Preferred ProTech-GII bulkhead HV/LV configuration with independent relays and voted inputs.
10. 8237-2595 – Preferred ProTech-GII bulkhead HV/HV configuration with independent relays and voted inputs.
11. 8237-2596 – Preferred ProTech-GII bulkhead HV/LV configuration with voted relays and voted inputs.
12. 8237-2597 – Preferred ProTech-GII bulkhead HV/HV configuration with voted relays and voted inputs.
13. 8237-2598 – Preferred ProTech-GII panel-mount HV/LV configuration with independent relays and voted inputs.
14. 8237-2599 – Preferred ProTech-GII panel-mount HV/HV configuration with independent relays and voted inputs.
15. 8237-2601 – Preferred ProTech-GII panel-mount HV/HV configuration with voted relays and voted inputs.