Wide-range AC or DC input, common specifications include: 85-264 V AC, 47-440 Hz, and/or 110-250 V DC. (Specific to this part number)
Output Voltages
Provides multiple isolated DC output rails, typical for control systems, such as: +5 V DC (logic), ±15 V DC (analog circuits), +24 V DC (for relays, solenoids, sensors).
Output Power Rating
Sufficient to power a chassis or group of modules within a Woodward system (e.g., 50W, 100W, 150W). Specific to 8901-457.
Regulation & Ripple
Tight voltage regulation and low output ripple/noise to ensure stable operation of sensitive control electronics.
Efficiency
High efficiency design to minimize heat dissipation within the enclosure.
Protections
Includes safeguards against: input undervoltage/overvoltage, output overvoltage, overcurrent, short circuit, and overtemperature.
Isolation
High isolation voltage between input and output, and often between different output rails.
Monitoring
May include status indicators (LEDs) for power good and fault conditions. May provide a relay contact or logic signal for remote monitoring of power supply health.
Cooling Method
Convection or forced air cooling, depending on power rating and design.
Mounting
Designed for DIN-rail or chassis mounting within a control cabinet.
Operating Temperature
Industrial temperature range, typically -20°C to +70°C.
Certifications
cULus, CE, and other relevant industrial safety and EMC standards.
The WOODWARD 8901-457 is a critical component within Woodward’s industrial control portfolio, specifically identified as a Power Supply Module. This module is designed to provide reliable, conditioned, and regulated DC power to other electronic control modules within a Woodward control system, typically for gas or steam turbine control, generator excitation, or engine governing applications. Its primary function is to convert raw input power—which may be an unregulated or variable AC or DC source from the plant—into the stable, isolated, and protected DC voltage rails required for the sensitive operation of digital and analog control boards, input/output modules, and communication interfaces. The 8901-457 ensures that the entire control system operates with a clean and uninterrupted power source, which is fundamental to the stability, accuracy, and reliability of the control loops managing critical rotating equipment.
The value of the WOODWARD 8901-457 lies in its robustness, reliability, and protective features. In industrial and power generation environments, power quality can be poor, with transients, sags, and electrical noise. This power supply module is engineered to withstand such conditions, providing isolation and filtering to protect downstream electronics. It often incorporates redundancy features or monitoring signals to indicate its health. For system integrators and maintenance personnel, a properly functioning 8901-457 module is essential for preventing nuisance trips or erratic controller behavior caused by power issues. It acts as the foundational electrical infrastructure for the control cabinet, directly contributing to the overall mean time between failures (MTBF) of the control system and, by extension, the availability of the turbine, engine, or generator it controls.
Technical Specifications
Parameter Name
Parameter Value
Product Model
WOODWARD 8901-457
Manufacturer
Woodward, Inc.
Product Type
Power Supply Module
Typical Input Voltage
Wide-range AC or DC input, common specifications include: 85-264 V AC, 47-440 Hz, and/or 110-250 V DC. (Specific to this part number)
Output Voltages
Provides multiple isolated DC output rails, typical for control systems, such as: +5 V DC (logic), ±15 V DC (analog circuits), +24 V DC (for relays, solenoids, sensors).
Output Power Rating
Sufficient to power a chassis or group of modules within a Woodward system (e.g., 50W, 100W, 150W). Specific to 8901-457.
Regulation & Ripple
Tight voltage regulation and low output ripple/noise to ensure stable operation of sensitive control electronics.
Efficiency
High efficiency design to minimize heat dissipation within the enclosure.
Protections
Includes safeguards against: input undervoltage/overvoltage, output overvoltage, overcurrent, short circuit, and overtemperature.
Isolation
High isolation voltage between input and output, and often between different output rails.
Monitoring
May include status indicators (LEDs) for power good and fault conditions. May provide a relay contact or logic signal for remote monitoring of power supply health.
Cooling Method
Convection or forced air cooling, depending on power rating and design.
Mounting
Designed for DIN-rail or chassis mounting within a control cabinet.
Operating Temperature
Industrial temperature range, typically -20°C to +70°C.
Certifications
cULus, CE, and other relevant industrial safety and EMC standards.
Key Features and Advantages
WOODWARD 8901-457 is distinguished by its industrial-grade robustness and reliability. Engineered for 24/7 operation in demanding environments like power plants and compressor stations, it uses high-quality components and conservative design margins to ensure long-term performance. Its wide-range input capability allows it to be deployed globally without modification, accommodating varying site voltages and tolerating significant line fluctuations. The multiple isolated outputs prevent noise from digital circuits from interfering with sensitive analog measurement and control loops, which is critical for maintaining control accuracy.
8440-1936
Comprehensive protection and diagnostic features are integral to its design. The module is not just a converter; it is a protective device. Built-in protections guard against common power anomalies, safeguarding both itself and the expensive control modules it powers. Features like overtemperature shutdown prevent thermal runaway. The inclusion of status monitoring (via LEDs or a contact) provides immediate local and remote indication of the power supply’s health, enabling predictive maintenance—replacing a power supply showing signs of degradation before it fails and causes an unplanned shutdown.
Seamless integration and design for serviceability within Woodward systems are key benefits. The module is physically and electrically designed to plug into or interconnect with other Woodward control hardware, ensuring compatibility and reliable mating. Its form factor often allows for easy replacement. In many systems, power supplies like the 8901-457 can be configured in a redundant (N+1) arrangement, where if one module fails, the other instantly picks up the full load without interruption, maximizing system availability. For system designers, this module provides a trusted, application-proven power foundation that minimizes risk, simplifies compliance with electrical standards, and contributes directly to the high availability of the overall control system.
Application Areas
The WOODWARD 8901-457 power supply module is deployed within Woodward control systems across a spectrum of industries that rely on precise control of prime movers.
Its primary application is in turbine control systems:
Gas Turbine Control (e.g., Woodward Micronet, NetCon, or Peak 150 systems): Provides clean power for the controller’s processor, I/O cards, and communication modules.
Steam Turbine Control: Powers the governing and control electronics.
Hydro Turbine Control.
It is also used in engine governing systems for large diesel and gas engines in power generation, marine, and rail applications. Within generator excitation systems (static exciters), it supplies power to the regulator electronics. Furthermore, it can be found in compressor control and anti-surge systems. Essentially, the 8901-457 is utilized wherever a Woodward electronic control system is employed to manage a critical rotating asset, requiring a dedicated, high-integrity internal power source to ensure continuous and fault-free operation of the control logic.
Related Products
Woodward Control Chassis/Rack: The enclosure that houses the power supply and other control modules.
Woodward Controller Modules (e.g., CPU modules): The primary processing units powered by the 8901-457.
Woodward I/O Modules (Analog & Digital): The input/output interfaces that rely on the stable voltages from the power supply.
Woodward Communication Gateways/Modules: Network interfaces also powered by this supply.
Redundant Power Supply Kits: Hardware to facilitate N+1 redundancy with multiple 8901-457 modules.
External AC/DC Power Source: The plant power feed that supplies the input to the 8901-457.
Power Distribution Block / Fuses: Upstream protection and distribution for the input power.
Woodward ToolKit Software: While primarily for controller configuration, system health monitoring may include power supply status.
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