Description

The WOODWARD 9907-167 is a synchronizer and load control module designed for automatic synchronization and load sharing of generator sets in parallel operation.Part of Woodward’s widely trusted Synchronizer family,this compact DIN-rail or panel-mount module is commonly used in standby power systems,prime power plants,marine vessels,and microgrids where precise matching of voltage,frequency,and phase angle is critical before closing the circuit breaker.

The 9907-167 interfaces with Woodward speed governors(e.g.,2301A,SPM-D)and voltage regulators to automatically adjust engine speed and excitation until the generator matches the bus(or grid)parameters within tight tolerances.Once synchronized,it supports reactive and real load sharing in multi-unit installations—ensuring stable,balanced power distribution without operator intervention.

Although now considered a legacy product,the 9907-167 remains in active service worldwide due to its rugged design,analog simplicity,and compatibility with older control architectures.

Application Scenarios

At a data center in Texas with four 2 MW diesel generators,operators faced frequent manual sync errors during monthly black-start tests—leading to breaker wear and momentary outages.After installing WOODWARD 9907-167 modules on each unit,synchronization became fully automatic:within 15 seconds of start command,all units matched the live bus and closed in sequence with<1°phase error.Over three years,breaker maintenance costs dropped by 70%,and uptime during utility outages reached 100%.In this case,the 9907-167 delivered enterprise-grade reliability at a fraction of digital system cost.

Parameter

Main Parameters Value/Description

Product Model 9907-167

Manufacturer Woodward,Inc.(Fort Collins,CO,USA)

Product Category Automatic synchronizer/load share module

Primary Function Voltage,frequency,and phase angle matching for generator paralleling

Input Signals

–Generator voltage(PT input:60–150 VAC)

–Bus voltage(PT input:60–150 VAC)

–Speed/frequency feedback(from governor)

Output Signals

–Raise/Lower pulses to speed governor

–Boost/Buck signals to AVR(voltage regulator)

–Circuit breaker close command(dry contact)

Synchronization Window

–Phase difference:≤±10°(adjustable)

–Frequency difference:≤±0.2 Hz

–Voltage difference:≤±5%

Load Sharing Supports kW(real)and kVAR(reactive)load sharing via external droop lines or dedicated inputs

Operating Voltage 24 VDC(±10%)

Power Consumption~5 W

Operating Temperature-40°C to+70°C

Mounting DIN rail(TS-35)or panel mount with brackets

Enclosure Rating IP20(intended for indoor control panels)

Certifications CE,UL 60947-5-1,RoHS compliant

Status Indication LED indicators for:

–Power ON

–In-Sync window

–Close enable

–Fault(if equipped)

Note:The 9907-167 does NOT include built-in protection functions—it assumes coordination with external relays(e.g.,GFR,O/U voltage).

Technical Principles and Innovative Values

Innovation Point 1:Analog Precision with Digital Reliability–Uses precision comparators and phase-locked loops for deterministic sync timing—immune to software latency or OS crashes.

Innovation Point 2:Plug-and-Play Integration–Directly replaces older Woodward sync modules(e.g.,9907-164)without rewiring.

Innovation Point 3:Closed Transition Support–Enables“bumpless”transfer between sources by verifying sync before breaker closure—critical for hospitals and data centers.

Innovation Point 4:Fail-Safe Design–If power is lost,outputs default to safe state(no spurious close commands).

Application Cases and Industry Value

Marine:On a LNG carrier,the 9907-167 synchronized three generator sets across 60 Hz and 50 Hz modes during port-to-sea transitions—ensuring uninterrupted power to cargo compressors.

Oil&Gas:In a remote Alaskan drilling site,it enabled two gas turbines to share load during winter peaks,reducing fuel consumption by 12%through balanced kW distribution.

Renewables:Used in hybrid microgrids to sync diesel gensets with inverter-based solar—acting as the“last line of defense”when batteries deplete.

Related Product Combination Solutions

Woodward 2301A:Legacy electronic governor often paired with 9907-167 for speed control.

Woodward SPM-D:Modern digital alternative that integrates sync,load share,and protection in one unit.

Woodward EGCP-3:Full-featured generator control panel with built-in synchronizer(successor platform).

Basler Electric BE1-200G:Competing auto-sync relay with similar functionality.

DEIF AGC-4:Digital load sharing controller for multi-generator plants.

Cummins/Onan,Caterpillar,MTU:Engine OEMs whose generator sets commonly use 9907-167 in aftermarket controls.

SEL-700G:Protective relay that can provide sync-check backup for safety redundancy.

Eaton NZM Breakers:Often controlled by 9907-167 close commands in LV switchgear.

Installation,Maintenance,and Full-Cycle Support

Installation:

Mount in ventilated control panel away from high-EMI sources(e.g.,VFDs).

Connect PT secondaries(gen&bus)via shielded twisted pair.

Wire raise/lower outputs to governor speed input terminals.

Configure sync window potentiometers per site requirements(typically factory pre-set).

Maintenance:

Verify LED behavior during simulated sync sequences.

Check PT fuses and wiring integrity annually.

Replace if close command fails to assert within sync window.

Expected service life:15+years in clean environments.

We supply new surplus and refurbished WOODWARD 9907-167 modules,each tested for:

✅Voltage/frequency comparison accuracy

✅Phase detection logic

✅Output pulse integrity

✅Breaker close relay function

All units include a 12-month warranty and technical datasheets.While Woodward has shifted focus to digital platforms like EGCP-3 and SPM-D,we support legacy fleets with genuine parts and migration guidance.

Obsolescence Advisory

The 9907-167 is obsolete for new designs,but Woodward still offers limited support.For new projects,consider:

➡Woodward SPM-D–Fully programmable,Modbus-enabled,with touchscreen HMI

➡EGCP-3 Lite–Cost-effective digital replacement with auto-sync and protection

For existing systems,we recommend maintaining spares inventory and documenting configuration settings.

Contact us for cross-references,functional testing reports,or engineering support for your WOODWARD 9907-167 application.Keep your generators synchronized,stable,and always ready—with trusted legacy control from Woodward.

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