Description
The Woodward Model 9907-252 is a precision electronic Load Sharing Module (LSM) designed to balance power distribution and manage active load across multiple engine-generator sets operating in parallel. It is engineered to allow seamless load sharing across both Woodward and non-Woodward equipped engines. Below are the ten core specification parameters detailing its build, origin, and technical ratings:
- Brand: WOODWARD
- Model Number: 9907-252
- 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: Standard Industrial Panel-Mount Form Factor
- Weight: Approx. 1.35 kg (2.98 lbs)
- Country of Origin: USA
- Power & Input Ratings: 24 VDC supply voltage, multi-phase CT current inputs, and +0.5 to +4.5 VDC analog output type
⚙️ Operating Guidelines & Usage Methods
Proper integration of the Woodward 9907-252 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.
During active operation, the module provides reliable isochronous or droop load-sharing capabilities to maintain proportional power distribution across parallel generators. 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 DC control power distribution panel, ensuring the 24 VDC 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 (24 VDC) 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 9907-252 operates by processing current transformer and potential transformer signals to monitor generator real power output, generating a precise +0.5 to +4.5 VDC analog output type to interface with electronic speed controls and engine governors. It provides both isochronous and droop load sharing modes, ensuring balanced power distribution and system stability. A key advantage of this unit is its versatility: it is engineered to allow effective load sharing across mixed generator setups containing both Woodward and non-Woodward equipped engines.
❓ Frequently Asked Questions (Q&A)
Q1: What power supply voltage does the 9907-252 module require? A1: This specific variant operates on a 24 VDC supply voltage.
Q2: What analog output signal type does the unit generate to interface with governors? A2: It outputs a +0.5 to +4.5 VDC analog signal to control engine speed and manage load distribution.
Q3: Can this module be used in systems with non-Woodward equipment? A3: Yes. The 9907-252 is explicitly designed to allow load sharing across mixed configurations involving both Woodward and non-Woodward equipped engines.
Q4: What load-sharing modes are supported by this controller? A4: It supports both isochronous (constant speed/frequency with proportional sharing) and droop load-sharing modes.
