Description

Woodward 9905-020 – 2301A Load Sharing and Speed Control

Product Overview

The Woodward 9905-020 is a low-voltage 2301A Load Sharing and Speed Control unit designed for precise speed regulation of industrial prime movers. It is a forward-acting controller intended for a single actuator and operates from a 20-40 VDC power supply. The unit provides a 0-200 mA actuator output and includes an adjustable deceleration ramp, making it suitable for turbine and engine speed-control applications where actuator response must be coordinated with operating conditions. Woodward’s 2301A documentation places this model within the 9905/9907 series and distinguishes it from related versions by actuator current, forward/reverse action, tandem operation, and deceleration-ramp configuration.

Technical Specifications

Woodward specifies the low-voltage 2301A family for 20-40 VDC operation, with a minimum 15 W power capacity. The model table specifically identifies 9905-020 as a 0-200 mA, forward-acting, single-actuator version with deceleration ramp functionality.

Woodward 9905-020

Key Features and Benefits

• 20-40 VDC low-voltage supply for industrial control panels.
• 0-200 mA actuator output for compatible Woodward actuators.
• Forward-acting control characteristic.
• Designed for a single actuator rather than tandem actuator arrangements.
• Adjustable deceleration-ramp functionality for controlled speed reduction.
• Multiple selectable speed-frequency ranges accommodate different prime movers and magnetic pickup configurations.
• Suitable for legacy turbine, engine, and generator control systems where the original 2301A architecture remains in service.
• Four selectable speed ranges provide useful flexibility during commissioning and maintenance.

Personally, I would verify the actuator type and speed-sensor characteristics before approving a replacement. A similar-looking 2301A model may have a different actuator-current range or control direction, which can make it unsuitable even when the enclosure and terminals appear identical.

Related Models

9905-021 — Low-voltage 2301A version with the same 0-200 mA actuator range but reverse-acting control.

9905-022 — Forward-acting 20-40 VDC model with a higher 0-400 mA actuator output.

9905-024 — Forward-acting low-voltage version configured for tandem actuators.

9905-026 — Low-voltage 2301A variant using a 0-20 mA actuator output rather than the 0-200 mA range.

Installation and Maintenance

Before replacement, record the original speed-range switch setting, actuator wiring, magnetic pickup connections, load-sharing connections, speed-droop settings, gain settings, and other commissioning parameters. The 2301A controller is part of the prime-mover governing system, so incorrect configuration can directly affect speed regulation.

Verify that the DC supply is within the specified 20-40 VDC range and has at least the required power capacity. Wiring should be properly fused and routed according to Woodward installation requirements. Inspect actuator terminals, speed-sensor wiring, grounding, and control adjustments during preventive maintenance.

After installation, perform the manufacturer’s approved commissioning sequence. Confirm correct forward-acting response, stable speed feedback, actuator travel, load-sharing behavior where applicable, and controlled deceleration before returning the prime mover to normal service.

Product Warranty

Warranty coverage depends on supplier, stock condition, and purchase agreement. For legacy Woodward controls, confirm whether the unit is new old stock, refurbished, tested used, or surplus, and request the exact hardware revision, functional-test report, and warranty period before procurement.

The Woodward 9905-020 remains a valuable controlled spare for installations using the 2301A low-voltage governing architecture, particularly where exact actuator output and forward-acting configuration must be preserved.