WOODWARD 9905-068
WOODWARD 9905-068
WOODWARD 9905-068
WOODWARD 9905-068

Woodward 9905-007 | SPM-A Series Synchronizer Module for Industrial Generator/Turbine Control

  • Model: 9905-007
  • Manufacturer: Woodward (USA)
  • Series: SPM-A (Synchronizer)
  • Type: Industrial Generator/Turbine Synchronization Module (Standard Version)
  • Key Feature: Automatic synchronization of generator speed/frequency/phase with utility bus; supports 120/240V AC input; integrated breaker closure signal for seamless parallel operation.
  • Primary Use: Enables reliable parallel operation of generators/turbines in power generation, marine propulsion, and industrial cogeneration systems.
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Part number: Woodward 9905-007
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Description

Product Overview

The Woodward 9905-007​ is a SPM-A series standard-model synchronization module​ designed for industrial generator and turbine control systems. It serves as a critical interface for synchronizing offline generators/turbines with an online system​ (e.g., utility grid or another generator) before paralleling. As part of Woodward’s SPM-A ecosystem—renowned for precision synchronization—the 9905-007 is optimized for standard industrial environments​ (e.g., power plants, marine engine rooms, industrial cogeneration facilities) where reliable grid compliance and uptime are essential.
Its core function is to match the offline unit’s frequency, phase, and voltage​ to the online system within strict tolerances, then send a contact closure signal to close the circuit breaker—enabling smooth power transfer without electrical faults (e.g., phase mismatch, frequency surges). The 9905-007 is positioned as a cost-effective solution for basic synchronization needs, sharing the SPM-A platform’s foundational reliability with variants like the 9905-028 (120/240V AC) and 9905-002 (115/230V AC).

Key Technical Specifications

Insights from Woodward SPM-A series documentation​ and industrial supplier listings​ (e.g., GlobalSpec, Machinio) reveal the following parameters for the 9905-007 (standard version):
  • Input Voltage: 120 VAC RMS or 240 VAC RMS (supports North American power standards).
  • Frequency Range: 50 to 60 Hz (compatible with global grid frequencies).
  • Synchronization Tolerances:
    • Frequency: ±0.1 Hz (matches online system frequency).
    • Phase Angle: ±10° (aligns generator phase with the online system).
    • Voltage: 1–5% (adjusts generator voltage to match the online system).
  • Output Options:
    • Breaker Closure Signal: Dry contact (24 Vdc, 2A) to trigger circuit breaker closing.
    • Status Indication: 3x LED indicators (power, sync ready, fault).
  • Power Consumption: ≤8 W (low-power design for continuous operation).
  • Operating Temperature: -20°C to +70°C (-4°F to +158°F) (suitable for indoor industrial environments).
  • Mounting: Panel-mounted (fits standard 19-inch control cabinets).
  • Certifications: CE, UL (compliant with international industrial safety standards).
  • Dimensions: ~250 mm × 180 mm × 80 mm (9.8in × 7.1in × 3.1in) – compact for space-constrained panels.
  • Weight: ~3.5 kg (7.7 lbs) – lightweight for easy handling.

    WOODWARD 9905-068

    WOODWARD 9905-068

Field Application & Problem Solved

In industrial power systems, improper generator synchronization​ (e.g., frequency mismatch, phase misalignment) can lead to:
  • Electrical Faults: Short circuits, voltage spikes, or equipment damage (e.g., generator windings).
  • Grid Penalties: Fines for frequency deviations (e.g., >±0.5 Hz from 50/60 Hz).
  • Downtime: Generator tripping, process interruptions, or delayed grid connection.
The 9905-007 addresses these challenges by:
  1. Automated Synchronization: Continuously monitors the online system’s frequency/phase and adjusts the offline generator’s speed via a control signal (e.g., to a Woodward 2301A governor).
  2. Tight Tolerance Control: Ensures frequency (±0.1 Hz) and phase (±10°) alignment, meeting basic grid code requirements.
  3. Seamless Breaker Closure: Sends a dry contact signal only when synchronization is achieved, preventing premature breaker closure.
Typical Applications:
  • Power Generation: Synchronizing standby diesel/gas generators to the utility grid during peak demand or outages.
  • Marine Propulsion: Synchronizing shipboard generators for auxiliary power.
  • Industrial Cogeneration: Paralleling turbine-driven generators with grid power to balance electrical/thermal loads.

Installation & Maintenance Pitfalls (Expert Tips)

To ensure reliable synchronization with the 9905-007:
  1. Verify Input Voltage:
    • Confirm the input voltage (120/240V AC) matches the module’s rating. Use a multimeter to check for voltage drops, which can disrupt synchronization.
  2. Check Phase Angle Settings:
    • Adjust the phase angle matching range (±10°) per application needs. For example, power plants may require a tighter tolerance (±5°) for grid compliance.
  3. Test Synchronization Logic:
    • After installation, simulate synchronization using a variable frequency drive (VFD) to adjust the generator’s speed. Verify the module sends a breaker closure signal only when all parameters are aligned.
  4. Perform Regular Maintenance:
    • Inspect annually for loose connections, cracked casings, or corroded terminals. Clean connectors with isopropyl alcohol to remove debris.

      WOODWARD 9905-068

      WOODWARD 9905-068

Technical Deep Dive & Overview

The 9905-007 operates on Woodward’s SPM-A base synchronization algorithm, a proven method for generator paralleling:
  1. Signal Reception: Measures the online system’s frequency, phase, and voltage via potential transformers (PTs) and current transformers (CTs).
  2. Comparison & Adjustment: Compares the offline generator’s parameters to the online system. If mismatched, it sends a control signal to the generator’s governor (e.g., 2301A) to adjust speed (frequency) or excitation (voltage).
  3. Phase Locking: Uses a phase-locked loop (PLL) circuit​ to align the generator’s phase with the online system once frequency/voltage are matched.
  4. Breaker Closure: When all parameters are within tolerance, the module energizes a dry contact to close the circuit breaker, paralleling the generator.
Distinction from Similar Models:
  • Input Voltage: 120/240V AC (North American focus) vs. 9905-002’s 115/230V AC (global focus).
  • Simpler Diagnostics: 3x LEDs vs. 9905-228’s 4x LEDs + fault logging (enhanced version).

Final Notes

The Woodward 9905-007​ is a cost-effective SPM-A series synchronizer for industrial generator/turbine control in standard environments. Its automated synchronization, tight tolerance alignment, and seamless integration with Woodward’s ecosystem make it ideal for basic grid-connection applications where advanced diagnostics are not required.
  • Upgrade Consideration: For enhanced diagnostics (fault logging, Modbus RTU), use the 9905-228​ (enhanced SPM-A); for global voltage compatibility, use 9905-002.
  • Maintenance: Follow Woodward’s SPM-A Series Synchronizer Manual (Document # SPM-A-OM-001)​ and consult certified technicians.

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