WOODWARD 9905-068 Replacement for 2301A Series

Product Overview

WOODWARD 9905-068 Replacement for 2301A Series: Smooth Transition & Legacy System Upgrade

The WOODWARD 9905-068 is a core load sharing and speed control module within the 2301A Series governor control platform, widely deployed across power generation, turbine control, and industrial drive systems. As original 9905-068 units reach end-of-life or become increasingly difficult to source, facilities running legacy WOODWARD 2301A control panels face mounting pressure to secure reliable replacements without triggering full system redesigns or extended outages.

This listing provides a verified replacement and upgrade solution for the WOODWARD 9905-068, engineered to deliver drop-in compatibility with existing 2301A Series control architectures. Whether your plant is managing a scheduled overhaul, responding to an unplanned failure, or executing a phased modernization program, this module is stocked, tested, and ready to ship from our Xiamen facility.

Compatibility Comparison Table

Seamless Upgrade Solutions

Replacing the 9905-068 module is rarely an isolated task. In most 2301A-based governor control panels, the speed control module operates alongside a network of interconnected components that must be evaluated during any retrofit or modernization project.

The WOODWARD 2301A actuator driver, typically paired with the 9905-068, governs the fuel valve or throttle actuator output signal. If the actuator driver board shows signs of drift or calibration loss, it is advisable to replace it concurrently to avoid re-entry into the panel after commissioning. Similarly, the magnetic pickup (MPU) speed sensor — which feeds the primary speed signal into the 9905-068 — should be inspected and replaced if signal amplitude is degraded, as a weak MPU signal is a common root cause of governor instability that is often misdiagnosed as a module fault.

For facilities integrating the 2301A system into a broader SCADA or DCS environment, the addition of a WOODWARD 2301D or 505 series digital governor controller may be considered as a longer-term upgrade path, offering RS-232 or CAN communication capabilities not available on the analog 9905-068 platform. In the interim, signal isolators and analog-to-digital converters can bridge the 9905-068’s discrete I/O outputs to modern PLC input cards without requiring panel rewiring.

Power supply integrity is critical in governor control applications. A dedicated 24 VDC regulated power supply module, sized appropriately for the 2301A panel load, should be verified before commissioning the replacement 9905-068. Voltage ripple or transient spikes from an aging panel power supply are a frequent cause of premature module failure. Terminal blocks and wiring ferrules within the control cabinet should also be inspected — corroded or loose terminations on the actuator output or speed reference circuits will produce erratic governor behavior regardless of module condition.

If the existing control cabinet also houses a WOODWARD 2301A load sharing module (separate from the speed control function), verify that the load sharing gain and droop settings are re-entered after module swap, as these parameters are stored locally on the module and are not retained across hardware replacements. For multi-generator paralleling applications, the load sharing lines between units must be re-verified for correct polarity and impedance matching after any module change.

Retrofit Guidance FAQ

Q: Is the wiring terminal layout identical to the original 9905-068?
A: Yes. The replacement unit uses the same screw terminal block layout as the original 2301A Series module. No rewiring is required. Terminal labels and wire numbers from the original panel drawings remain valid.

Q: Do I need to reprogram the replacement module?
A: The 9905-068 is a hardware-configured analog governor module — there is no software programming required. Speed reference, droop percentage, gain, and stability adjustments are made via onboard potentiometers, identical to the original unit. Refer to WOODWARD manual 82510 for calibration procedures.

Q: Is the replacement compatible with my existing magnetic pickup (MPU)?
A: Yes, provided the MPU output voltage is within the 1–25 Vrms range and frequency corresponds to the tooth count and shaft speed of your prime mover. No signal conditioning adapter is required for standard MPU installations.

Q: Can this module be used in a paralleling application with other 2301A units?
A: Yes. The load sharing circuit is fully compatible with existing 2301A load sharing bus wiring. Verify load sharing gain and polarity after installation.

Q: What is the physical installation space requirement?
A: The replacement unit matches the original 2301A module footprint. No panel cutout modification, additional DIN rail space, or bracket adaptation is required.

Q: How do I verify the module is functioning correctly after installation?
A: Apply rated DC supply voltage, connect the MPU signal, and verify actuator output current response to speed reference changes using a calibrated milliammeter. Confirm isochronous speed hold and load sharing response per WOODWARD commissioning procedures.

Warranty Assurance

Every WOODWARD 9905-068 replacement unit shipped from TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each module undergoes functional verification including power-on testing, actuator output current check, and speed input signal response validation. Units are packaged in anti-static protective enclosures with foam cushioning to prevent transit damage.

In the event of a confirmed module defect within the warranty period, TOPNLMS will arrange priority replacement dispatch to minimize your system downtime. Our technical support team is available to assist with installation queries, calibration guidance, and compatibility verification before and after purchase.

We maintain standing inventory of 2301A Series components at our Xiamen warehouse, enabling same-day or next-business-day dispatch for in-stock items. Express international freight options are available for urgent plant requirements.

For volume procurement, OEM supply agreements, or consignment stocking arrangements, please contact our industrial sales team directly.