Description
The Woodward Model 9907-173 is a precision electronic Load Sharing Module (LSM) designed to balance power distribution and manage active load across multiple generators or engines operating in parallel. Below are the ten core specification parameters detailing its build, origin, and technical ratings:
- Brand: WOODWARD
- Model Number: 9907-173 (Legacy Part No. equivalent: 8290-048)
- Series: LSM (Load Sharing Module) Series
- Product Name: Load Sharing Module
- Place of Production: United States / Global Facilities
- Condition State: Brand New / Factory Recertified Options Available
- Dimensions: Approx. 273.6 mm × 59.2 mm × 214.1 mm (10.77 in × 2.33 in × 8.43 in)
- Weight: Approx. 1.48 kg (3.26 lbs)
- Country of Origin: USA
- Power & Input Ratings: 100–240 VAC (50–400 Hz) input power supply, 20 W power consumption, 3–7 A RMS CT input, and \pm 3 VDC analog output type
⚙️ Operating Guidelines & Usage Methods
Proper integration of the Woodward 9907-173 module requires strict adherence to industrial electrical standards and precise wiring of potential transformers (PTs) and current transformers (CTs) for accurate load sensing. Operators must ensure that all control and measurement wiring utilizes shielded twisted-pair cables to mitigate electromagnetic interference (EMI) from adjacent high-voltage lines. Grounding must be implemented strictly in accordance with manufacturer guidelines to protect internal circuitry from ground loops and voltage transients. Voltage selection is handled via internal terminal jumpers.
During active operation, the module provides isochronous or droop load-sharing capabilities. Droop mode can be selected using an external droop switch or by leaving the auxiliary circuit breaker open. Maintenance personnel should periodically inspect terminal block connections and verify that ambient operating temperatures remain within specified industrial limits. Never attempt internal component repairs or adjustments while the unit is energized, as this can cause permanent electrical damage or severe personal injury.
⚡ Power-Up & Power-Down Sequence
Industrial control hardware demands a structured sequencing protocol to prevent voltage spikes, data corruption, and out-of-phase load distribution across parallel systems.
Startup Sequence:
- Verify that all external emergency stop circuits, safety interlocks, and auxiliary sensing lines are fully functional and in their normal standby states.
- Energize the control power distribution panel, ensuring the 100–240 VAC input supply to the module stabilizes within its operational window.
- Allow the module internal circuitry and self-test routines to complete fully.
- Bring the incoming generator up to rated speed and voltage, feeding the multi-phase CT and potential transformer sensing inputs correctly.
- Enable the load-sharing control loops to coordinate frequency and active power distribution across parallel units before placing them under heavy demand.
Shutdown Sequence:
- Command an orderly unloading cycle via the controller interface to ramp active electrical load down to zero or baseline safety limits.
- Open the main generator circuit breaker once the unit is safely unloaded.
- Command the prime mover shutdown sequence, allowing engine or turbine deceleration to a complete standstill.
- De-energize the module input power supply (100–240 VAC) by opening the main control circuit breakers.
- Lock out and tag out (LOTO) all power sources if physical maintenance or module replacement is required.
📖 Product Operating Instructions
The Woodward 9907-173 operates by processing current and potential transformer signals to monitor generator real power output, generating a precise \pm 3 VDC bias output signal to interface with engine speed controls and governors. It ensures proportional load sharing to improve system efficiency, stability, and reliability in multi-unit power generation setups. It is fully compatible with broader Woodward power generation accessories such as the SPM-A/SPM-D synchronizers, Automatic Generator Loading Control (AGLC), and Automatic Power Transfer and Loading Control (APTL). Note: Unlike other models in the series, this unit does not support manual output level adjustment via an external potentiometer.
❓ Frequently Asked Questions (Q&A)
Q1: How is the input voltage selected on the 9907-173 module?
A1: Jumpers are used to configure and select the appropriate voltage type for the input power supply on the module.
Q2: Does this model support manual output level adjustments using an external potentiometer?
A2: No. The 9907-173 is unique in its product series for omitting support for external potentiometer output-level adjustments.
Q3: How do you configure droop or isochronous operation on this unit?
A3: Droop mode is engaged using an external droop switch or automatically when the auxiliary circuit breaker is opened; otherwise, it operates in isochronous mode.
Q4: What speed control signal output does the 9907-173 provide?
A4: It outputs a \pm 3 VDC control signal to interface seamlessly with compatible engine speed governors.
