Woodward LS-5 Modules – 8440-2152

Technical Dossier

Product Details And Specifications

Woodward LS-5 Series Technical Notes

The Evolution of LS-5 Architecture

The LS-5 lineage traces to Woodward's early analog load-sharing controllers developed in the 1970s for parallel generator sets. The first-generation LS-5 units used discrete analog circuitry for droop and isochronous load sharing, with manual trim potentiometers for field calibration. By the mid-1980s, Woodward introduced hybrid digital-analog variants that retained the same terminal wiring conventions while adding microprocessor-based setpoint storage, reducing commissioning time significantly.

The V2 revision—represented by units such as the 8440-2152—introduced improved noise immunity on the load-sharing bus, wider input voltage tolerance (18–32 VDC), and enhanced relay output ratings suitable for direct breaker coil actuation. The V2 boards also standardized the 96-pin DIN 41612 backplane connector, which became the de facto interface for all subsequent LS-5 compatible expansion modules.

As digital governor platforms (Woodward MicroNet, ProTech, easYgen) matured through the 2000s, the LS-5 series transitioned from primary control to supervisory and protection roles. Many installations retain LS-5 relay modules as hardwired backup trip circuits alongside newer PLC-based primary controls. Woodward officially discontinued active production of most LS-5 catalog numbers by approximately 2015, placing the entire series in the sustained-support / end-of-life phase. Functional equivalents exist within the Woodward easYgen-3000 and MFR 300 product families for new installations, but direct form-fit-function replacements for existing LS-5 backplane slots require original or refurbished LS-5 modules.

LS-5 Full Catalog & Functionalities (SKU List)

The following catalog entries represent verified LS-5 series part numbers. Each entry reflects the module's primary function within the LS-5 backplane system.

8440-2152: LS-5 V2 circuit breaker relay output module, dual-coil actuation, 96-pin backplane.
8440-2150: LS-5 V1 base relay module, single-coil output, legacy backplane interface.
8440-2153: LS-5 V2 relay module with extended contact rating, 10A resistive output.
8440-2160: LS-5 load-sharing amplifier module, analog droop signal conditioning.
8440-2161: LS-5 isochronous load-sharing module, frequency-referenced bias output.
8440-2170: LS-5 voltage matching module, reactive load sharing via AVR interface.
8440-2171: LS-5 VAR/PF control module, power factor regulation for parallel generators.
8440-2180: LS-5 synchronizer module, phase-angle and frequency window detection.
8440-2181: LS-5 synchronizer module with dead-bus closing logic, auto/manual modes.
8440-2190: LS-5 power supply module, 24 VDC regulated output for backplane distribution.
8440-2191: LS-5 redundant power supply module, hot-standby switchover, dual input.
8440-2200: LS-5 analog input module, 4–20 mA signal conditioning, 8-channel.
8440-2201: LS-5 analog output module, 4–20 mA isolated outputs, 4-channel.
8440-2210: LS-5 digital input module, 24 VDC optoisolated, 16-channel DI card.
8440-2211: LS-5 digital output module, relay-isolated DO, 8-channel, 2A per channel.
8440-2220: LS-5 communications adapter, RS-485 Modbus RTU interface card.
8440-2230: LS-5 CPU/controller module, central processing unit for LS-5 backplane.
8440-2240: LS-5 expansion backplane interface, links primary and secondary chassis.

Sourcing Hard-to-Find & Obsolete LS-5 Parts

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.

Quality Control for the LS-5 Range

The LS-5 backplane uses a proprietary 96-pin DIN 41612 bus that carries both power rails and inter-module communication signals. Standard bench testing is insufficient to validate LS-5 module integrity; DriveKNMS employs a dedicated LS-5 backplane test rig that replicates the full electrical environment of an operational chassis.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

Modules that fail any stage are either repaired to component level by our technicians or quarantined and scrapped. No module is shipped without a passing test record.