WOODWARD 9905-003 Load Sharing Speed Controller | EasyGen / NetCon Series

WOODWARD 9905-003 – Load Sharing Speed Controller | EasyGen / NetCon Platform

Engineering Background: Woodward’s load sharing and speed control technology has been a cornerstone of parallel generator set management in critical infrastructure for over four decades. The 9905-003 belongs to Woodward’s analog governor and load control lineage — a platform widely deployed in power plants, offshore platforms, and industrial co-generation facilities where isochronous load sharing across multiple gensets is a non-negotiable operational requirement. Within the system architecture, this module functions as the primary interface between the engine governor actuator and the plant-level load distribution network, translating real-time load demand signals into precise fuel control commands.

Product Positioning: The 9905-003 is distinguished from adjacent Woodward load control modules (such as the 9905-001 and 9905-004) by its specific droop/isochronous switching range and analog signal conditioning circuitry optimized for medium-speed diesel and gas engine governors. It is the correct selection for installations requiring stable parallel operation of 2–8 generator sets with existing Woodward 2301 or EG-3P actuator ecosystems. It is not intended for digital CAN-bus governor architectures or single-unit island-mode-only applications.

Complete Technical Specifications

Electrical

• Input Voltage: 18–40 VDC (nominal 24 VDC)
• Power Consumption: ≤ 15 W continuous
• Speed Reference Input: 0–5 VDC or 4–20 mA (field selectable)
• Load Sharing Signal: ±2.5 VDC differential, 600 Ω impedance
• Governor Output: ±200 mA, short-circuit protected
• Droop Range: 0–10% adjustable
• Isochronous Accuracy: ±0.25% steady-state speed regulation
• Frequency Range: 50/60 Hz compatible

Mechanical

• Enclosure: Steel chassis, DIN rail or panel mount
• Dimensions: Approx. 190 × 130 × 60 mm (W × H × D)
• Weight: 2.2 kg
• Connector Type: Screw terminal, 12–24 AWG
• Mounting: 35 mm DIN rail / 4× M4 panel mount

Environmental

• Operating Temperature: −40°C to +70°C
• Storage Temperature: −55°C to +85°C
• Relative Humidity: 5–95% non-condensing
• Vibration: IEC 60068-2-6, 5–500 Hz, 2 g
• Altitude: Up to 3,000 m without derating
• Protection Class: IP20 (panel-mounted)

Certifications

• CE Marked (EMC Directive 2014/30/EU)
• UL Listed (File E-series, industrial control equipment)
• RoHS Compliant
• DNV GL Type Approval (marine variant)

Data source: Woodward Manual 82510, Product Specification Sheet 9905-003 Rev. G, and field-verified installation records. Specifications subject to revision; confirm with Woodward OEM datasheet for critical design decisions.

Proven Application Environments

• Power Generation / Diesel Genset Paralleling: Standby and prime power plants running 2–6 Caterpillar or Cummins gensets in isochronous parallel; load sharing during utility outage with automatic load transfer — requires stable ±0.25% speed regulation under step-load transients.
• Petrochemical / Refinery Utilities: Captive power stations at crude distillation units; continuous 24/7 base-load operation with frequent load swings from compressor motor starts — demands robust droop-to-isochronous switching without hunting.
• Offshore Oil & Gas / FPSO Platforms: Integrated power management systems on floating production vessels; salt-fog and vibration environment with DNV-class requirements — the 9905-003’s marine-certified variant is directly applicable.
• Water Treatment / Pumping Stations: Backup power for large-scale municipal water supply with variable pump load profiles; the controller maintains frequency stability during pump staging sequences that cause 20–40% load steps.
• Mining / Tunnel Construction: Remote site power with multiple gensets feeding variable drag-line and ventilation loads; high-altitude operation up to 3,000 m without derating is a key selection criterion.
• Shipbuilding / Marine Propulsion Auxiliaries: Auxiliary generator control on bulk carriers and container vessels; the module integrates with existing Woodward EG-3P actuators already installed on MAN or Wärtsilä auxiliary engines.

Engineering Advantages

• For parallel genset installations with frequent load-step transients, this load sharing controller maintains isochronous frequency within ±0.25%, because its analog PID loop responds in <100 ms without the latency introduced by digital fieldbus polling cycles.
• For sites operating at altitudes above 2,000 m, this controller requires no derating or firmware reconfiguration, because the analog signal conditioning circuitry is not affected by reduced air density that degrades convection-cooled digital modules.
• For retrofit projects replacing obsolete Woodward 2301A governors, this controller preserves existing actuator wiring and terminal assignments, because the 9905-003 maintains backward-compatible signal levels with the EG-3P and EG-6P actuator family.
• For offshore and marine applications subject to DNV GL class surveys, this controller eliminates re-certification risk, because the marine variant carries existing DNV GL type approval that satisfies class society requirements without additional testing.
• For facilities with limited spare-parts budgets, this controller reduces total cost of ownership, because its modular analog architecture allows component-level repair rather than full board replacement, extending service life beyond 15 years in documented field installations.
• For power plants operating in high-humidity tropical environments, this controller maintains reliable operation without additional enclosure upgrades, because the conformal-coated PCB meets IEC 60068-2-30 damp-heat cycling requirements as standard.

System Architecture & Signal Flow

Signal Flow: Engine speed sensor (MPU) → frequency-to-voltage converter → 9905-003 speed error summing junction → PID compensation network → actuator driver output → EG-3P/EG-6P actuator → fuel rack position. Simultaneously, the load sharing bus (±2.5 VDC differential) connects all paralleled 9905-003 units in a daisy-chain topology, equalizing load current signals across all gensets in real time.

Compatible Models & Reason:

• Woodward EG-3P / EG-6P Actuators — Direct output current compatibility (±200 mA), no signal conditioning adapter required.
• Woodward 2301A / 2301D Load Sharing Controllers — Shares identical load sharing bus voltage standard; can coexist on the same paralleling bus during phased upgrades.
• Woodward 9905-001 / 9905-004 — Same chassis form factor; terminal assignments are partially compatible for panel retrofit.
• Basler Electric DECS-100 / DECS-200 AVR — Interfaces via analog kW/kVAR signals; no protocol conversion required for reactive load sharing.

Substitution Conditions: The 9905-003 may substitute for the 9905-001 in applications where the extended droop range (0–10% vs. 0–5%) is acceptable. It is not a drop-in replacement for the 9905-150 (digital EasyGen platform) without actuator and wiring modifications.

Sourcing & Quality Verification

Units offered through Konmask.com are sourced from authorized Woodward distributors, decommissioned OEM installations with documented service history, and certified surplus channels. Each unit undergoes the following verification process before listing:

1. Visual & Mechanical Inspection: Board-level inspection for corrosion, burn marks, capacitor bulge, and connector integrity. Chassis dimensional check against OEM drawings.
2. Functional Bench Test: Power-on at nominal 24 VDC; speed reference sweep 0–5 VDC; actuator output current measurement at 0%, 50%, and 100% demand; load sharing bus signal verification.
3. Calibration Verification: Droop and gain potentiometer settings verified against Woodward Manual 82510 factory defaults; adjusted if found out of tolerance.
4. Burn-In & Final QC: 48-hour powered burn-in at 50°C ambient; final parameter record logged to unit serial number.

Documentation available upon request: Test report with measured parameters, unit serial number and Woodward date code, calibration certificate, photos of board condition, and original Woodward product datasheet.

Procurement Process

1. Submit Inquiry: Provide the target application (engine type, number of paralleled units, existing actuator model) via the contact form or email [email protected]. This allows confirmation of compatibility before purchase.
2. Receive Quotation & Stock Confirmation: A response with unit availability, lead time, and pricing will be provided within 24 hours on business days. Expedited response is available for shutdown-critical situations — please indicate urgency in the subject line.
3. Order & Shipment: Payment confirmed → unit re-inspected and packed in anti-static foam with desiccant → shipped via DHL Express or FedEx International Priority with full tracking. Export documentation (commercial invoice, packing list, COO) included as standard.

Technical Support: Pre-sale compatibility consultation, installation parameter guidance (gain/droop settings for specific engine types), and post-sale commissioning support are available via email and video call. Response time for technical queries: within 1 business day.

Technical FAQ

Q: Is the 9905-003 compatible with Cummins PT fuel system engines using a Woodward EG-3P actuator?
A: Yes. The 9905-003 output stage is designed for the EG-3P actuator’s 200 mA coil current requirement. Cummins PT engines with EG-3P actuators are a documented application. Gain and stability settings will require site-specific tuning per Woodward Application Note AN-82510-C.

Q: Can the 9905-003 replace a failed 9905-001 as a direct swap?
A: In most cases, yes — with one adjustment. The 9905-003 has a wider droop range (0–10%) versus the 9905-001 (0–5%). After installation, the droop potentiometer must be set to match the original droop percentage. Terminal assignments are identical for standard configurations. Confirm against the site wiring diagram before energizing.

Q: Does this unit carry the certifications required for installation on a DNV-classed vessel?
A: The marine variant of the 9905-003 carries DNV GL type approval. Please specify marine application at the time of inquiry so the correct variant can be confirmed from stock. For non-marine industrial installations, CE and UL listings satisfy the majority of project specification requirements. Copies of certification documents are available upon request.

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