Description
WOODWARD SPM-D11 8440-1703 — Generator Synchronizing Unit
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | SPM-D11 |
| Part Number | 8440-1703 |
| Manufacturer | WOODWARD |
| Product Type | Synchronizing Unit |
| Package | LSR |
| Auxiliary Supply | 12/24 VDC |
| Generator Voltage Input | 100/120 VAC |
| Generator CT Input | 5 A secondary |
| Synchronization | Supported |
| Synch-Check | Supported |
| Breaker Control | 1 breaker |
| Isolated Operation | Supported |
| Dead-Bus Operation | Supported |
| Generator Protection | Over/undervoltage, over/underfrequency, overload, reverse power, reduced power |
| Load/VAR Control | Supported |
| Load/VAR Sharing | Supported |
| Discrete Control | Speed/load and voltage/power-factor raise/lower functions |
| Alarm Relays | 3 |
| Signalling Relays | 3 |
| Configuration | Front panel / PC configuration |
| Housing | Type 1 |
| Mounting | Flush mounting |
| Dimensions | Approx. 144 × 72 × 122 mm |
| Weight | Approx. 800 g |
| Protection | IP42 / IP21 depending on installation/configuration |
Woodward’s product specification identifies the SPM-D11 as a synchronizer with integrated generator power and load-sharing control. The 8440-1703 version is specifically listed under the 100 VAC measuring-input / 5 A CT configuration with 12/24 VDC supply.
Product Introduction
The WOODWARD SPM-D11 8440-1703 is a generator synchronizing unit designed to coordinate generator voltage, frequency, phase relationship, and circuit-breaker closing during synchronization. The SPM-D11 platform also incorporates control functions for generator power levels and load sharing, allowing it to serve as more than a simple synch-check relay. Woodward documentation lists synchronization, synch-check, black-start, load/VAR control, and load/VAR sharing among the available functions.
The WOODWARD SPM-D11 8440-1703 is specifically an /LSR 12/24 VDC version with 100/120 VAC voltage measurement and 5 A current-transformer inputs. This configuration matters when replacing an existing unit because other part numbers use different CT/PT combinations or the LSXR package.
SPM-D11 8440-1703
Application Scenarios & Field Pitfalls (Engineer’s Perspective)
The 8440-1703 is suited to generator paralleling, diesel-generator synchronization, standby power systems, industrial power-generation switchgear, and generator load-sharing applications. It can control the synchronization process and provide breaker-related logic while also supporting generator protection and load/VAR control functions.
Field pitfalls:
- Confirm the CT ratio before installation. 8440-1703 belongs to the 5 A CT configuration. Woodward also produced variants for 1 A CT inputs, so the part number cannot be selected solely from the designation.
- Check the PT/voltage-input configuration. The 8440-1703 version uses the 100/120 VAC measurement configuration. Other variants support different voltage-transformer secondary configurations, including 400 VAC versions.
- LSR versus LSXR matters. The LSXR package provides additional controller functionality, including analog controller outputs. Do not assume an LSXR unit is an equivalent replacement for an LSR installation.
- Synchronization settings are application-specific. Slip frequency, voltage matching, frequency matching, breaker closing time, dead-bus logic, and synchronization limits need to correspond to the generator and switchgear.
- Preserve the existing configuration. Before replacing an operating , document the parameter settings and relay/output assignments. A replacement unit that has the correct hardware part number can still behave differently if configuration parameters are not restored correctly.
- Do not confuse it with a speed governor. Some secondary listings incorrectly label the 8440-1703 as a speed-control module. Woodward’s own documentation identifies the as a synchronizing unit.
Related Products
- WOODWARD 8440-1702 — /LSR version with 100 VAC measurement and 1 A CT input; CT configuration differs from 8440-1703.
- WOODWARD 8440-1705 — LSXR version using the 100 VAC / 1 A measurement configuration.
- WOODWARD 8440-1706 — LSXR 12/24 VDC version with 100/120 VAC measurement and 5 A CT input; package differs from 8440-1703.
- WOODWARD 8440-1708 — 24 VDC LSR variant with 100 VAC / 1 A measurement configuration.
- WOODWARD 8440-1686 — LSR 12/24 VDC version using the 400 VAC / 5 A measurement configuration.
- WOODWARD 8440-1666 — LSXR 12/24 VDC version with 400 VAC / 5 A measurement configuration.
- WOODWARD 8440-1709 — LSR 24 VDC variant with 100/120 VAC and 5 A measurement configuration.
- WOODWARD 8440-1713 — LSXR 24 VDC version with 100/120 VAC and 5 A measurement configuration.
Procurement Note
For 8440-1703, the critical identification points are:
+ LSR + 12/24 VDC + 100/120 VAC measurement + 5 A CT input
Do not replace it solely with another . The CT secondary rating, voltage-transformer configuration, LSR/LSXR package, auxiliary supply, and configured control functions need to match the installed generator system. Woodward’s documentation specifically distinguishes these variants by part number.
Before commissioning a replacement, verify synchronization parameters, breaker timing, generator/PT/CT wiring, dead-bus logic, and load-sharing settings against the existing installation and approved generator protection procedure.
