9905-003
9905-003
9905-003
9905-003
9905-003
9905-003
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    Discontinued / Obsolete by OEM
    Apter Power supports 9905-003 remaining-stock sourcing and non-drop-in replacement planning.

9905-003

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Woodward 9905-003 is an SPM-A synchronizer that matches generator and bus conditions before issuing a circuit-breaker close command.
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Technical specifications for 9905-003

  • Manufacturer:
    Woodward
  • Part Number:
    9905-003
  • Product Family:
    Woodward SPM-A Synchronizer
  • Product Type:
    SPM-A Synchronizer
  • Stock:
    1
  • System Frequency:
    50/60 Hz
  • Input Voltage:
    115 or 230 VAC RMS
  • Phase Window:
    ±10°
  • Voltage Matching:
    5%
  • Power Consumption:
    Maximum 5 W
  • Operating Temperature:
    -45°C to +70°C
  • Weight:
    2.2 kg
  • Estimated shipping dimensions:
    38.7x18.1x6cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Sync Decision Control Modes Breaker Interface Applications

Features:

  • Three-condition decision: Frequency, phase and voltage are evaluated before breaker closure.
  • Commissioning modes: RUN, CHECK, PERMISSIVE and OFF separate testing from automatic operation.
  • Adjustable close stability: Dwell selection requires acceptable conditions to persist before the relay acts.
9905-003 is the Woodward SPM-A device used to bring an incoming generator into agreement with an energized bus.

It does more than compare meters: the synchronizer biases the prime-mover control and supervises the close window.

CHECK and PERMISSIVE modes give engineers ways to observe or qualify the decision before granting full automatic breaker closure.

Apter Power can help confirm Woodward 9905-003 voltage class, output interface, operating mode and breaker-control scope before quotation.
9905-003 Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Frequency comparison: Generator speed is guided toward bus frequency.
  • Phase comparison: Closure is allowed only inside the selected phase relationship.
  • Voltage matching: Generator and bus voltage must satisfy the permitted difference.
  • Dwell requirement: Conditions remain acceptable for the selected interval before the close output.
  • RUN mode: Enables the full automatic synchronizing sequence.
  • CHECK mode: Lets technicians observe operation without a normal breaker-close result.
  • PERMISSIVE mode: Provides a synchronism permission within the engineered control scheme.
  • OFF mode: Removes synchronizer action during isolated testing or maintenance.
  • Close relay: The output must match the breaker control-circuit load.
  • Bias output: Output impedance is selected for the connected speed governor interface.
  • Polarity control: Reversed generator or bus sensing can invalidate the closing decision.
  • Inhibited proof: Sensing and mode behavior are checked before the breaker is allowed to close.
  • Generator-to-bus paralleling: Brings an incoming set into a safe close window.
  • Multiple-generator plants: Synchronizes another generator to an energized common bus.
  • Standby power systems: Supports controlled return or paralleling where the switchgear permits it.
  • Legacy synchronizer service: Restores an installed SPM-A function while non-drop-in alternatives are engineered separately.
Description
9905-003 compares generator and bus frequency, phase and voltage so a breaker closes only when the selected synchronizing window is satisfied. It supports 50 or 60 Hz systems and provides run, check, permissive and off operating modes for different commissioning and control arrangements.

9905-003 uses a phase-locked control approach to guide the generator toward the bus before closure. Its practical advantage is a complete synchronizing decision in one device, including selectable dwell time and voltage matching, while the plant control retains authority over breaker and operating-mode permissives.
Alternative Names
SPM-A 9905-003
Technical notes
Before replacing 9905-003, record generator and bus voltage inputs, speed-bias output type, breaker relay wiring, operating mode and dwell setting. Prove voltage and phase sensing with the breaker inhibited, then use CHECK mode before enabling closure. Stop if polarity, frequency selection or breaker-command logic differs from the approved generator diagram.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What does 9905-003 verify before it closes a breaker?
It compares generator and bus frequency, phase and voltage, then requires the acceptable condition to persist for the selected dwell time before issuing the close command.
How should 9905-003 be tested without closing the breaker?
Use the documented CHECK arrangement with the breaker close path inhibited, observe the synchronizing response, and confirm that the decision matches independent voltage and phase measurements.
Can 9905-003 drive any breaker closing coil directly?
No. Compare the close-circuit voltage, steady current and inductive duty with the relay rating, and use an interposing relay when the switchgear load exceeds that boundary.
A 9905-003 installation drives the generator away from synchronism. What should be checked?
Stop the test and verify generator/bus sensing, phase rotation and the polarity and impedance of the governor bias connection before changing stability adjustments.
What should be recorded before removing 9905-003?
Record voltage selection, frequency, all terminals, bias-output connection, phase and voltage settings, dwell, operating mode and the breaker interlock logic.
Can a listed successor replace 9905-003 without wiring changes?
Woodward identifies alternatives that are not drop-in replacements. Treat selection, wiring, setup and functional validation as an engineered conversion rather than a direct swap.

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