Woodward 9905-860 Peak 150 Steam Turbine Control

Woodward 9905-860 Peak 150 Steam Turbine Digital Control

Product Introduction

The Woodward 9905-860 delivers compact and budget-friendly digital control for steam turbines. You can use this Peak 150 unit for single-valve rack or single-valve steam turbine applications. It includes valuable features like Modbus communication and a protective NEMA 4 enclosure. This specific model runs on 24 VDC power. The 9905-860 communicates seamlessly with PLCs and other industrial systems while resisting water and dust ingress.

Key Technical Specifications

The 9905-860 consumes a maximum of 38W of power. It operates within a temperature range of -25 to +60°C. For storage, you should keep it between -40 and +85°C to protect internal components. Dimensions measure 483mm wide x 310mm high x 105mm deep.

This unit provides two identical magnetic pickup inputs with high-signal-selected operation. The 5-digit LED speed display shows current turbine speed clearly. Additionally, six LED status indicators monitor remote speed setting signal, shutdown status, MPU 1, MPU 2, CPU health, and overspeed test mode.

Front Panel Interface and Control

The front panel includes six keypad switches for essential functions. Specifically, you can raise or lower speed, start the turbine, trigger an emergency trip, reset alarms, and perform overspeed tests. These physical buttons provide reliable tactile feedback. Moreover, the layout follows standard turbine control conventions for easy learning.

Six LED indicators give you immediate visual status updates. For instance, you can quickly check if both magnetic pickups are receiving valid signals. The shutdown LED alerts you to any trip conditions. Therefore, operators can monitor turbine health without navigating complex menus.

Configuration and Programming

Setting up the Woodward 9905-860 requires a handheld programmer unit. Woodward designed this method to prevent unwanted changes to your system. You connect the programmer directly to the unit. Then you can adjust parameters, set speed references, and configure Modbus communication settings.

This approach reduces the risk of accidental misconfiguration. Unauthorized personnel cannot modify settings without the handheld programmer. Consequently, your turbine control remains secure from unintended adjustments. The programming process is straightforward for trained technicians.

Modbus Communication and Integration

The 9905-860 includes built-in Modbus connectivity. Therefore, you can integrate it with PLCs, SCADA systems, and other automation equipment. This allows remote monitoring of turbine speed, status indicators, and alarm conditions. You can also send setpoint changes or start commands from a central control room.

For system integrators, this feature adds significant value. You do not need separate communication converters or proprietary gateways. The Woodward 9905-860 speaks Modbus natively. Thus, it fits easily into existing industrial networks.

NEMA 4 Enclosure Protection

The NEMA 4 enclosure rating means this unit resists water splashes, hose-directed water, and dust ingress. You can install it in wash-down areas or humid environments without concern. For steam turbine applications, this protection is critical. Condensation, steam leaks, or cleaning procedures will not damage the 9905-860.

Additionally, the enclosure protects internal electronics from airborne contaminants. This improves long-term reliability and reduces maintenance costs. You can mount the unit directly on or near the turbine skid.

Installation Guidelines

First, mount the 9905-860 in a location that stays between -25 and +60°C. Ensure the NEMA 4 seal remains intact during installation. Use appropriate cable glands to maintain enclosure integrity. Next, connect 24 VDC power with proper overcurrent protection. Then wire your two magnetic pickups to the dedicated inputs. The unit automatically selects the higher signal from the two MPUs.

Connect the Modbus communication wires to the appropriate terminals. Set the Modbus address and baud rate using the handheld programmer. Finally, power on the unit and verify the 5-digit LED display shows a valid reading.

Why Choose This Woodward Model

The Woodward 9905-860 balances cost, features, and durability. It offers industrial-grade protection without a high price tag. The dual magnetic pickup inputs provide redundancy for critical speed sensing. Modbus connectivity simplifies integration with modern control systems. Furthermore, the handheld programmer prevents unauthorized changes.

For steam turbine operators, this unit delivers essential control functions. Start, stop, raise speed, lower speed, emergency trip, and overspeed test are all available from the front panel. LED indicators give immediate status feedback. Therefore, the 9905-860 is an excellent choice for single-valve steam turbine applications.

Packaging List

• Woodward 9905-860 Peak 150 digital turbine control unit (1 unit)

• NEMA 4 enclosure with front panel keypad and LED display

• Mounting brackets and hardware

• Terminal block connectors

• Quick reference guide

Note: Handheld programmer unit sold separately. No certificates or warranty documents are included.

Shipping

We ship the 9905-860 worldwide via FedEx, UPS, or DHL. Each unit receives anti-static and shock-resistant packaging. Tracking information is provided within 24 hours of shipment.

Frequently Asked Questions (FAQ)

1. What turbines work with the Woodward 9905-860?
The 9905-860 works with single-valve rack or single-valve steam turbines. It is not designed for multi-valve or complex extraction turbines.

2. Do I need a special programmer to set up this unit?
Yes, you need the Woodward handheld programmer unit. This tool prevents unauthorized or accidental configuration changes to your turbine control system.

3. Can the 9905-860 communicate with my existing PLC?
Yes, the built-in Modbus connectivity allows communication with most PLCs and SCADA systems. You just need to configure the address and baud rate.

4. What happens if one magnetic pickup fails?
The 9905-860 has two identical magnetic pickup inputs. It automatically selects the higher signal. If one fails, the unit continues operating with the remaining good signal.

5. Is the NEMA 4 enclosure suitable for outdoor use?
Yes, NEMA 4 provides protection against rain, splashing water, and dust. However, you should avoid direct prolonged exposure to extreme weather or direct sunlight for best longevity.