Woodward 9905-068 2301A Speed Controller Module

Product Details

9905-068 2301A Product Description

The Woodward 9905-068 is a dedicated load sharing and speed control module engineered for seamless integration within the 2301A governor control architecture. Designed for industrial turbine-driven generator sets, compressors, and pump drive systems, this controller delivers precise isochronous speed regulation and real-time load sharing across parallel generating units. Its architecture-native design ensures direct compatibility with Woodward's broader 2301A ecosystem, enabling engineers to deploy, commission, and maintain a fully coordinated control platform without cross-brand compatibility compromises.

At the core of the 9905-068 is a high-resolution analog speed sensing circuit paired with a proportional-integral-derivative (PID) control loop optimized for turbine governor response. The module accepts magnetic pickup (MPU) speed signals and processes them through a configurable droop or isochronous control mode, making it suitable for both standalone prime mover applications and multi-unit paralleling configurations. Load sharing is achieved through a dedicated load sharing line that synchronizes output signals across all participating 2301A-series controllers, ensuring balanced real power distribution without manual trimming.

Within a layered industrial control architecture, the 9905-068 occupies the control layer, interfacing upward with supervisory SCADA or DCS platforms and downward with actuator drivers, fuel valve positioners, and speed sensors. Its analog output signal is compatible with Woodward's EG-3P and EG-10P actuators, as well as third-party electro-hydraulic actuators operating on standard 4–20 mA or ±200 mA control signals. This broad actuator compatibility reduces system integration risk and simplifies retrofit deployments in legacy turbine control panels.

System coherence is further enhanced when the 9905-068 is deployed alongside complementary Woodward components. The 2301A Digital Control (P/N 9907-018) provides the primary digital governor function, while the 9905-068 extends the platform with dedicated load sharing capability. Power supply stability is maintained by Woodward's 9905-075 power supply module, which conditions incoming AC or DC plant power to the regulated DC levels required by the control electronics. For multi-unit paralleling, the 9905-068 load sharing line interfaces directly with the 2301A Parallel/Droop Kit (9905-292), enabling plug-and-play expansion of the generating fleet without rewiring the control cabinet.

Communication and diagnostics within the 2301A architecture are supported through Woodward's 723 Digital Control and MicroNet TMR platforms for applications requiring higher redundancy. In critical power generation facilities, the 9905-068 can be integrated into a redundant control scheme where a hot-standby 2301A controller monitors system health and assumes control upon primary controller fault detection. This redundancy layer is essential for continuous-process industries including petrochemical plants, offshore platforms, and data center backup power systems where unplanned turbine trips carry significant operational and financial consequences.

Installation of the 9905-068 follows standard DIN rail or panel-mount configurations consistent with the 2301A product family. Terminal block wiring is clearly labeled and follows Woodward's standardized I/O mapping, reducing commissioning time for engineers familiar with the 2301A platform. Calibration is performed via front-panel potentiometers for speed reference, droop percentage, load sharing gain, and stability, with all adjustments accessible without removing the module from service. This in-service tunability is particularly valuable during initial load acceptance testing and during periodic maintenance windows.

For process industries requiring integration with distributed control systems, the 9905-068 analog outputs can be monitored by Yokogawa CENTUM VP DCS I/O modules or ABB System 800xA remote I/O stations, providing plant-wide visibility of turbine speed and load status without dedicated governor HMI hardware. Alarm and trip signals from the 9905-068 can be wired to Woodward's 505 Digital Control or to third-party safety relay modules such as the Phoenix Contact PSR series, ensuring that overspeed, underspeed, and load imbalance conditions trigger appropriate protective responses at the plant safety layer.

Long-term maintainability is a defining characteristic of the 9905-068 platform. The module's analog circuit design, based on proven operational amplifier technology, offers exceptional mean time between failures (MTBF) in industrial environments rated to IEC 60068 temperature and vibration standards. Spare module inventory management is simplified by the 9905-068's direct interchangeability with other 2301A load sharing controllers, allowing maintenance teams to maintain a single spare that covers multiple turbine units across a facility. All units supplied by NANKMOS undergo pre-shipment functional testing against Woodward factory acceptance criteria, with test records provided upon request.

NANKMOS maintains ready stock of the Woodward 9905-068 with standard lead times of 3–5 business days for in-stock units. Each module is covered by a 12-Month Warranty against manufacturing defects and operational failures under normal service conditions. Technical support for system integration, wiring verification, and commissioning parameter setup is available through our engineering team at [email protected].

The Woodward 9905-068 achieves its full performance potential when deployed as part of a coordinated automation platform. At the governor control layer, it operates in concert with the Woodward 2301A Digital Control (9907-018), which provides the primary speed reference and PID governor function, while the 9905-068 manages the load sharing bus to balance real power across parallel units. Power conditioning for the control cabinet is handled by the Woodward 9905-075 Power Supply Module, which delivers regulated 24 VDC to all 2301A-series modules and eliminates noise-induced control instability.

Actuator interfacing is accomplished through the Woodward EG-3P Electro-Hydraulic Actuator or the Woodward EG-10P for higher-torque fuel valve applications, both of which accept the 9905-068's ±200 mA output signal directly. For multi-unit paralleling, the Woodward 9905-292 Parallel/Droop Kit extends the load sharing bus to additional generating units, enabling fleet-wide isochronous load sharing without additional signal conditioning hardware.

At the I/O and signal conditioning layer, Phoenix Contact MACX MCR signal isolators protect the 9905-068's analog inputs from ground loops and common-mode voltage transients common in turbine control environments. For supervisory integration, Yokogawa CENTUM VP Remote I/O (NFAI141) modules collect the 9905-068's 4–20 mA status outputs and relay turbine speed and load data to the plant DCS historian. Safety and protection functions are coordinated through Woodward 505 Digital Control for overspeed trip logic, with hardwired backup provided by Phoenix Contact PSR-SCP safety relays at the protection layer. Industrial Ethernet connectivity for SCADA visualization is provided by Moxa EDS-308 managed switches, which segment the control network and ensure deterministic communication latency for real-time governor monitoring.

Power Generation: The 9905-068 is the standard load sharing controller for natural gas, diesel, and steam turbine generator sets in industrial power plants, cogeneration facilities, and island-mode microgrids. Its isochronous load sharing capability ensures stable frequency and balanced real power distribution across parallel generating units, meeting IEEE 1547 grid interconnection stability requirements.

Oil, Gas & Petrochemical: In offshore platform power systems and onshore gas compression stations, the 9905-068 governs turbine-driven compressor trains where load sharing between multiple driver units is critical for process throughput stability. Its wide operating temperature range and vibration tolerance meet the environmental demands of Zone 2 hazardous area control rooms.

Water & Wastewater Treatment: Municipal water authorities deploy the 9905-068 on turbine-driven high-lift pump stations where variable load demand requires continuous speed adjustment. The module's droop control mode enables smooth load transfer between duty and standby pump drives during peak demand periods.

Mining & Minerals Processing: In mine site power systems operating in islanded grid configurations, the 9905-068 provides the load sharing backbone for diesel generator fleets powering crushing, grinding, and ventilation loads. Its robust analog design withstands the high-vibration, high-dust environments typical of underground and open-cut mining operations.

Marine & Offshore: Shipboard power management systems utilize the 9905-068 for generator paralleling on vessels requiring dynamic positioning (DP) capability, where precise load sharing between shaft generators and auxiliary diesel sets is mandated by class society rules (DNV, Lloyd's Register).

Q1: Is the Woodward 9905-068 directly interchangeable with other 2301A load sharing controllers in an existing panel?Yes. The 9905-068 is designed as a direct form-fit-function replacement within the 2301A product family. Terminal block pinouts, power supply requirements, and load sharing line connections are standardized across the 2301A series, allowing module swap without panel rewiring. Recalibration of speed reference, droop, and load sharing gain potentiometers is recommended after replacement to match the specific turbine's governor response characteristics.

Q2: Can the 9905-068 be integrated into a DCS-supervised control architecture alongside Yokogawa or ABB systems?Yes. The 9905-068's 4–20 mA analog outputs are universally compatible with DCS analog input modules from Yokogawa (CENTUM VP, ProSafe-RS), ABB (System 800xA, AC500), and Siemens (S7-300/400 AI modules). The controller operates as a standalone governor at the field device layer, with its speed and load status signals monitored by the DCS at the supervisory layer. No proprietary communication protocol is required, making it straightforward to integrate into multi-vendor control architectures.

Q3: What does the 12-Month Warranty cover, and what is the process for warranty claims?The 12-Month Warranty provided by NANKMOS covers all manufacturing defects, component failures, and operational malfunctions occurring under normal service conditions as defined in the Woodward 9905-068 installation and operation manual. The warranty period commences from the date of shipment. To initiate a warranty claim, contact NANKMOS at [email protected] with the order reference number, a description of the fault symptom, and the operating conditions at the time of failure. NANKMOS will arrange return merchandise authorization (RMA) and provide a replacement or repaired unit within the agreed service lead time.