Description
Product Overview
The Woodward SPM-D2-1010B/YB is a microprocessor-based synchronizing unit designed to coordinate an AC generator with a bus or another electrical system. Before a generator circuit breaker closes, the synchronizer evaluates the electrical conditions of the two systems and supports adjustment of generator frequency, phase, and voltage. This helps ensure that the generator reaches the configured synchronization limits before connection to the bus. The unit is intended for use with compatible speed governors and automatic voltage regulators, making it suitable for power-generation installations that require controlled generator paralleling.
The Woodward SPM-D2-1010B/YB, cataloged as Woodward part number 8440-2167, belongs to the SPM-D2-10 family. The model designation identifies a 100 VAC potential-transformer secondary input variant, no current-transformer inputs, flush mounting, and the YB power-supply package. The YB version uses a nominal 24 VDC supply, with a specified tolerance of ±25%. Its three-phase measurement configuration supports comparison of the relevant system voltages, while discrete outputs provide raise/lower commands to compatible speed and voltage control equipment. Depending on the installed configuration and enabled functions, the unit can also support synch-check and dead-bus start.
For maintenance and procurement teams, the Woodward SPM-D2-1010B/YB must be matched to the actual voltage-transformer secondary, control wiring, breaker interface, and generator-control arrangement. Do not confuse it with the NYB variant, which uses a wide-range AC/DC power supply, or with 400 VAC sensing variants that have different measuring-input configurations. During replacement, preserve the existing configuration and verify the rated system frequency, voltage scaling, phase sequence, breaker closing circuit, and governor/AVR response. Incorrect voltage-transformer settings or wiring can prevent synchronization or allow an unsafe breaker-close command. Commissioning should include a documented check of the configured limits and operating sequence before the unit is returned to service.
Product Introduction — Practical Field Focus
The SPM-D2-1010B/YB is intended for generator systems where automatic synchronization and breaker-closing supervision are required. It works as part of a larger control arrangement rather than replacing the governor, AVR, generator protection relays, or circuit breaker.
Before installation, verify the 100 VAC measuring-input configuration, 24 VDC supply, terminal assignments, and the existing synchronization settings. After replacement, test the sensing circuits and control outputs under the approved commissioning procedure. Keep the breaker-close circuit isolated during initial checks until phase sequence, voltage matching, frequency matching, and synchronization limits have been verified.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | SPM-D2-1010B/YB |
| Woodward Part Number | 8440-2167 |
| Manufacturer | Woodward |
| Product Type | Generator synchronizing unit |
| Control Function | Automatic generator synchronization |
| Measuring Configuration | Three-phase voltage measurement |
| PT Secondary Designation | 100 VAC variant |
| Current Transformer Inputs | None in this model configuration |
| Power Supply | 24 VDC nominal, ±25% |
| Measuring Frequency | 40–70 Hz |
| Voltage Measurement Accuracy | Class 1, per the SPM-D2-10/YB manual |
| Control Outputs | Relay-based discrete raise/lower speed and voltage commands |
| Synchronization Output | Relay output for circuit-breaker close command |
| Additional Functions | Synch-check and dead-bus start, subject to configuration |
| Mounting | Flush panel mounting |
| Dimensions | Approximately 144 × 72 × 122 mm |
| Ambient Temperature | −20°C to +70°C for the YB package |
| Configuration | Front-panel settings; verify software and configuration requirements for the installed revision |
| Related Wide-Range Supply Variant | SPM-D2-1010B/NYB; not electrically identical in power-supply requirements |
Woodward SPM-D2-1010B/YB
Related Products
The following Woodward models and components are relevant to generator synchronization and power-management applications. Confirm electrical and functional compatibility before substitution.
- Woodward SPM-D2-1040B/YB (8440-2176) — Related SPM-D2-10 synchronizer with a 400 VAC PT-secondary configuration.
- Woodward /NYB (8440-2177) — Related 100 VAC sensing model with a wide-range power supply.
- Woodward SPM-D2-1040B/NYB (8440-2189) — Related 400 VAC sensing configuration with a wide-range supply.
- Woodward /XN (8440-2172) — Related variant with analog speed/voltage bias options and a wide-range supply; verify the exact suffix and ordering number.
- Woodward SPM-D2-10 Series — Synchronizer family for generator voltage, frequency, and phase matching.
- Woodward easYgen Series — Generator-control family that may be considered in a broader modernization project; it is not automatically a drop-in substitute.
- Woodward speed governors — Compatible governor equipment can receive speed-adjustment commands from the synchronizer.
- Woodward automatic voltage regulators — Compatible AVR equipment can receive voltage-adjustment commands during synchronization.
Frequently Asked Questions
Q1. What does the Woodward /YB do?
It synchronizes a generator with a bus by monitoring electrical conditions and commanding adjustments to generator frequency and voltage before breaker closure. It can also provide synch-check functionality when configured appropriately.
Q2. What is the correct Woodward part number?
The published ordering number associated with /YB is 8440-2167. Check both the model designation and ordering number on the nameplate before procurement.
Q3. What power supply does the YB version require?
The YB version uses a nominal 24 VDC supply with a ±25% tolerance. Do not apply the wide-range AC/DC supply intended for the NYB version unless the exact unit documentation explicitly permits it.
Q4. What does the 1010 designation indicate?
In the model code, the “1” identifies the 100 VAC PT-secondary variant, the next “0” indicates no CT inputs, and “B” identifies flush mounting. The YB suffix identifies the relevant package configuration.
Q5. Can this synchronizer directly replace an older SPM-D unit?
Woodward documents the SPM-D2 family as a drop-in replacement for the corresponding SPM-D family, with matching wiring I/O and configuration masks. However, confirm the exact legacy model, voltage-sensing variant, power supply, and application settings before replacement.
Q6. Does the /YB support dead-bus start?
The SPM-D2-10/YB manual describes dead-bus start as a supported function using the appropriate discrete inputs. Confirm the required package, configuration, interlocks, and site operating procedure before enabling it.
Q7. What should be verified before commissioning?
Check the voltage-transformer ratios and secondary ratings, phase sequence, rated frequency, generator and bus voltage settings, governor and AVR response, breaker-close output wiring, and configured synchronization limits. Keep the breaker-close circuit isolated during initial testing until the sensing and control checks are complete.
Q8. What documentation should accompany a replacement?
Request the exact model and part-number confirmation, unit revision, condition report, configuration backup or parameter record where available, and test documentation. Verify that the offered unit is the 100 VAC sensing, 24 VDC YB configuration rather than a visually similar variant.
