Description
Product Overview
– Woodward 9905-204 is a **DSM Digital Speed Matching Synchronizer** – It matches generator speed to grid frequency automatically – The module also matches voltage within 1% accuracy – It uses a **small synchronization window** for precise connection – This device works with 115V or 230V AC systems – Use it for safe generator-to-grid or generator-to-generator sync
Key Technical Data
– **Brand**: Woodward – **Part Number**: 9905-204 – **Series**: 9900 – **Product Type**: DSM Synchronizer Module – **Voltage rating**: 115/230V AC – **Power supply option**: 125V DC – **Operating temperature**: -35°C to +65°C – **Board dimensions**: 33.0 cm high x 17.8 cm – **Module size**: 8.25 cm high x 4.27 cm – **Voltage matching accuracy**: 1% – **Sync window type**: Small window for tight control – **Frequency response**: 50/60 Hz grid compatible – **Sensitivity**: Microprocessor-based speed detection – **Resolution**: High precision for phase angle – **Environmental tolerance**: Wide temperature range for harsh sites – **Noise immunity**: Suitable for industrial electrical rooms
Installation Guide
– Mount the module in a dry, ventilated cabinet – Connect 115V or 230V AC power as marked – Use 125V DC supply if AC is not available – Keep wiring away from high-voltage cables – Follow local electrical codes for safety – Allow 5 cm clearance around the module for air flow
Debugging & Maintenance Convenience
– Front LEDs show sync status at a glance – The module supports manual override for testing – No special software needed for basic setup – Use a multimeter to verify voltage matching within 1% – Clean the board with dry air only. Do not use liquids
Compatibility
– Works with most diesel and gas generators – Compatible with Modicon Quantum PLC systems – Pairs with Woodward load sharing modules – Use with 115V or 230V AC generator controls – Small sync window suits modern digital governors
Certifications
– Meets industrial control standards – Designed for harsh temperature environments (-35°C to +65°C) – Voltage matching accuracy verified at 1%
Packing List
– 1 x Woodward 9905-204 DSM Module – 1 x Terminal connector set – Quick installation guide
Warranty & Shipping
– 12-month warranty from delivery date – Covers factory defects only – Shipping carriers: FedEx, UPS, DHL – Tracking provided within 24 hours
Typical Applications
– Generator synchronization to utility grid – Parallel operation of multiple generators – Marine vessel power systems – Remote mining or oil field power plants – Backup power for data centers
Diagnostic Capabilities
– Detects speed mismatch before closing breaker – Monitors voltage difference in real time – Outputs alarm if sync window conditions fail – Manual mode allows operator to verify each step – LED indicators show ready, sync, and alarm states
FAQ
What is a DSM synchronizer? DSM stands for Digital Speed Matching synchronizer. It matches generator speed and voltage to a live bus.
What does 1% voltage matching mean?
The module adjusts generator voltage until it stays within 1% of target voltage. This is very precise.
Can this run on DC power?
Yes. Use 125V DC as an alternative to 115/230V AC.
What is a small sync window?
A narrow window for breaker closure. It allows connection only when generator and grid are almost perfectly matched.
How cold can this module work?
Down to -35°C. Suitable for outdoor enclosures in winter.
How hot can it work?
Up to +65°C. Works in engine rooms or hot climates.
Do I need a separate load control module?
Yes for load sharing. This module handles speed and voltage only.
Is this module automatic?
Yes. It runs fully automatic. You can also switch to manual for testing.
My generator has 480V output. Will this work?
Use a potential transformer to step down to 115V or 230V AC.
How do I know if the module is ready to sync?
Check the front panel LED. Green means ready for breaker closure.
Can I use this with old analog governors?
Yes, if they accept a 0-10V or 4-20mA speed trim signal. Check your governor manual first.
What happens if voltage matching fails?
The module will not close the breaker. It prevents a bad connection.
Where can I find wiring examples?
Contact support with your generator model.
Buying Guide
– Check your generator output voltage. Use a step-down transformer for 480V systems – Choose this module when you need precise 1% voltage matching – For load sharing, buy a separate Woodward load control module – Confirm your operating temperature range. This module handles -35°C to +65°C – Select 115V AC version for North America. Use 230V AC for Europe and Asia – Verify your power source: 125V DC or AC as above – Order spare terminal connectors for faster installation – Contact us if your grid frequency is not 50 or 60 Hz
Contact Information
For inquiries: +86 158 8020 0923 (WhatsApp)
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