Product Overview

Core Working Principle

1. Load Signal Collection

2. Each 2301/2301A speed controller outputs analog load signal to the shared LSM bus. The LSM module samples load feedback from all paralleled gensets simultaneously.

3. Average Load Calculation

4. Internal analog summing circuit computes the average active load value of the whole parallel group automatically.

5. Load Bias Compensation

6. If one generator carries heavier or lighter load than average, the LSM sends proportional correction bias signal to its speed control:

• Overloaded unit: Send slow-down bias to reduce fuel supply and cut output power

• Underloaded unit: Send speed-up bias to raise fuel rack and increase power output

1. Closed-Loop Dynamic Balance

2. Continuous real-time adjustment keeps all gensets running at identical load percentage under isochronous constant frequency mode. When matched with SPM-A synchronizer, the whole system realizes full automatic workflow: synchronizing → breaker close → stable equal load sharing.

Key Product Features

1. Perfect Compatibility with Classic Woodward Analog Ecosystem

• Native matching with 2301 & 2301A analog speed control amplifiers (8270 series amplifier)

• Seamless signal interconnection with SPM-A Synchronizer (PN 9905 / 9907 series) low-impedance speed bias output port

• Supports EG / EGB proportional hydraulic actuators driven by 2301 series governors

1. High Precision Analog Load Balancing

2. Analog summing circuit delivers smooth, jitter-free load correction without digital lag; adjustable internal gain potentiometer adapts to diesel, gas engine and turbine dynamic response characteristics, eliminating load hunting and power oscillation during load step changes.

3. Multiple Model Specifications for Diversified Site Demands

4. Three mainstream part numbers cover mainstream power grid parameters and parallel scale:

• 9907-173: Standard 50/60Hz, low voltage signal version for small 2–4 genset parallel systems

• 9907-252: Wide-range industrial grade, supports up to 8 paralleled gensets, general factory & marine standard model

• 9907-838: Heavy-duty extended version, high noise immunity design for offshore, mining and harsh off-grid environments

1. Synchronizer Coordination Function

2. LSM load bus shares signal loop with SPM-A synchronizer. During pre-paralleling synchronization, SPM-A outputs speed matching signal to the LSM bus; after breaker closes, LSM takes over load balance control automatically without extra wiring switching.

3. Industrial Rugged Hardware Design

4. Metal enclosed PCB structure, full ESD protection conforming to Woodward Manual 82715 static handling standard. Wide ambient operating temperature range, strong anti-electromagnetic interference performance, suitable for switchgear cabinet back panel installation. All terminals adopt screw locking structure for stable long-term field wiring.

5. Simple On-Site Calibration

6. Front panel accessible adjustment potentiometers for load gain, dead band and offset compensation. No dedicated configuration software required; technicians complete commissioning via simple multimeter measurement and on-engine dynamic test.

Matching System Architecture (LSM + 2301A + SPM-A)

1. Prime mover control core: Woodward 2301A speed control with 8270 series amplifier

2. Synchronization unit: SPM-A Synchronizer (phase & frequency matching before paralleling)

3. Load balance core: LSM 9907 series load sharing module (equal load distribution after closing breaker)

4. Peripherals: MPU magnetic speed pickup, proportional EG/EGB actuator, generator potential transformer (PT)

5. System workflow:

6. Start genset → SPM-A detects bus voltage & phase → SPM sends speed trim signal to 2301A → Frequency & phase align within window → Breaker close command output → LSM module takes over load bus, continuously balance active power of all online gensets.

Typical Application Scenarios

1. Marine Vessel Auxiliary Power Systems

2. Multiple shipboard diesel generators running in parallel under isochronous mode, stable load sharing during navigation and berth switching.

3. Industrial Factory Backup Power Plants

4. Multi-unit diesel standby gensets for production line uninterrupted power supply, avoiding single unit overload during grid outage.

5. Off-Grid Mining & Remote Island Power Stations

6. Isolated grid parallel generation without utility grid connection, LSM maintains equal load distribution to extend engine service life.

7. Data Center Critical UPS Backup Power

8. High-reliability analog parallel system for legacy genset equipment retrofitting, compatible with original 2301A control without full cabinet replacement.

9. Small Gas Turbine Co-generation Systems

10. Synchronize multiple turbine prime movers, coordinate with SPM-A to realize automatic parallel and balanced power output.

Quick Selling Bullet Points (Sidebar Highlight)

• Three mainstream PN options: 9907-173 / 9907-252 / 9907-838 for different parallel scales

• Classic analog load balancer matched with Woodward 2301 / 2301A governor & SPM-A synchronizer

• Real-time isochronous equal load sharing without speed droop loss

• Smooth analog correction circuit to eliminate genset load hunting

• Direct signal compatibility with SPM-A synchronizer speed bias bus

• Adjustable gain & deadband potentiometers for engine dynamic tuning

• Rugged metal cabinet, ESD & EMI industrial compliance

• Simple field calibration without PC configuration software

• Ideal retrofit part for legacy Woodward analog parallel power systems

• Supports diesel engine, gas engine and small steam/gas turbine prime movers

Installation & Compatibility Notice

1. Wiring requirement: Use twisted shielded cables for LSM load sharing bus; shield grounding only at control cabinet side per Woodward Manual 25070 wiring specification.

2. When matching SPM-A synchronizer, select low-impedance output terminal of SPM-A to connect LSM load bus for normal speed matching signal transmission.

3. Each parallel genset must be equipped with independent 2301/2301A governor; one set of LSM module serves the whole parallel group.

4. Static protection mandatory during maintenance: Operators discharge body static before touching internal PCB to avoid component burnout following Manual 82715.

5. For units over 8 parallel gensets, deploy multi-group separated LSM bus topology to prevent signal attenuation and load imbalance.

Service & Replacement Guidance