Condition comparison
The synchronizer compares the generator-side electrical condition with the bus reference instead of issuing a close command from a single measurement.
WOODWARDINDUSTRIAL TURBINE CONTROL · 8440-2167
SPM-D2 · SYNCHRONIZER · BIAS CONFIGURATION
Woodward 8440-2167 / 8440-2168 SPM-D2 Synchronizer
GENERATOR VOLTAGE MATCHING · SPEED AND VOLTAGE BIAS
01 // B CONTENT
Product Details
Woodward 8440-2167 and Woodward 8440-2168 are SPM-D2 synchronizer variants for generator breaker closing control. They compare generator and bus conditions and provide the synchronizing function used to bring the generator into the configured electrical window before a close command.
At the wiring level, Woodward 8440-2167 and Woodward 8440-2168 differ in the SPM-D2 bias arrangement identified by their part numbers. The selected variant receives the specified sensing and bias connections, processes the synchronizing conditions and passes the ready-to-close result to the associated breaker control path.
The sensing path for Woodward 8440-2167 and Woodward 8440-2168 therefore links the generator and bus measurements to the selected bias terminals, and the resulting permissive continues into the breaker logic only after the configured window is met.
02 // ENGINEERING DATA
Specification Summary
| Technical Item | Specification |
|---|---|
| Brand | Woodward |
| Product type | SPM-D2 synchronizer |
| Model group | 8440-2167 / 8440-2168 |
| Series | SPM-D2 |
| Primary role | Generator-to-bus synchronizing |
| Measured relationship | Generator voltage, frequency and phase against bus reference |
| Control path | Synchronizing permissive to generator breaker circuit |
| Variant distinction | Part-number-specific bias and sensing arrangement |
| Installation boundary | Voltage and control wiring must follow the selected SPM-D2 variant |
| Commissioning focus | Sensing polarity, bias path and breaker permissive |
| 8440-2167 configuration | SPM-D2-1010B/YB, 110 VAC sensing; three-phase paralleling |
| 8440-2168 configuration | SPM-D2-1010B/X, 110 VAC sensing with analog speed/voltage bias |
| Control result | Synchronizing permissive to the generator breaker circuit |
03 // SYNCHRONIZING DUTY
Synchronizing Function
The SPM-D2 function in Woodward 8440-2167 and Woodward 8440-2168 is centered on matching the generator condition to the bus before breaker operation.
Bias control
The selected Woodward 8440-2167 or Woodward 8440-2168 wiring determines how the configured speed and voltage bias path is applied.
Close permissive
When the configured synchronizing window is satisfied, the module provides the permissive used by the breaker control circuit.
04 // SENSING AND BIAS
Bias Interface
Woodward 8440-2167 and Woodward 8440-2168 sit between the generator and bus sensing circuits and the breaker command path.
Generator inputs
The generator voltage and frequency signals enter the SPM-D2 sensing terminals assigned to the selected variant.
Bus reference
The bus measurement is kept as a separate reference so phase and frequency comparison can be resolved before closing.
Breaker interface
The permissive output is carried to the generator breaker logic; it is not a substitute for the breaker coil wiring or protection chain.
05 // FIELD QUESTIONS
Frequently Asked Questions
Which sensing relationship must be checked on Woodward 8440-2167 / 8440-2168 before synchronizing?
Check generator-to-bus voltage phase, frequency and polarity at the SPM-D2 terminals first. Woodward 8440-2167 and Woodward 8440-2168 require the selected variant wiring to remain consistent with that sensing relationship.
Can the bias wiring from Woodward 8440-2167 / 8440-2168 be interchanged?
Do not interchange the bias conductors solely because the connectors look alike. Verify the exact part-number wiring and confirm which path controls speed bias and which controls voltage bias.
Why can Woodward 8440-2167 / 8440-2168 show synchronism but not close the breaker?
Check the permissive path after confirming the generator and bus measurements. The SPM-D2 result still has to pass through the configured breaker logic and any external protection interlock.
What should be measured if Woodward 8440-2167 / 8440-2168 reports a persistent phase error?
Compare the generator and bus voltage phase at the module terminals, then check transformer polarity and terminal assignment. Do not correct a phase error by changing a bias setting before the sensing path is verified.
How is the correct SPM-D2 variant identified for Woodward 8440-2167 / 8440-2168?
Use the complete part number on the device and wiring record. The two numbers identify different bias or sensing arrangements, so a generic SPM-D2 label is not enough for replacement.
What commissioning record is useful for Woodward 8440-2167 / 8440-2168?
Record the generator and bus sensing terminals, the bias connections and the breaker permissive destination. This preserves the actual synchronizer path instead of only recording the enclosure label.
06 // OUR SERVICES
Our Services
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07 // CROSS-BRAND SELECTION
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Contact Details
Include the complete Woodward model and requested quantity so the enquiry remains tied to the correct configuration.
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