Woodward UMT1 UMT145B A3 LR20523 Modules

Technical Dossier

Product Details And Specifications

Woodward UMT Series Technical Notes

The Woodward UMT (Universal Microprocessor-based Turbine) series represents one of the most widely deployed turbine control platforms in global heavy industry. Installed across gas turbine power plants, steam turbine-driven compressors, combined-cycle facilities, petrochemical refineries, and nuclear auxiliary systems, the UMT architecture has maintained a continuous field presence since the early 1990s. Its modular backplane design, deterministic scan cycle, and compatibility with Woodward's proprietary communication protocols made it the reference standard for OEM turbine control packages from GE, Siemens, Solar Turbines, and Dresser-Rand. Installed base estimates place active UMT-controlled turbines in the tens of thousands globally, with significant concentrations in the Middle East, Southeast Asia, and North American LNG infrastructure.

The Evolution of UMT Architecture

The UMT series was introduced by Woodward as a successor to the analog-based EG and TG governor families. The first-generation UMT1 platform (circa 1991–1998) used a single-board CPU with discrete I/O expansion via a passive backplane. Communication was limited to RS-232/RS-485 serial links. The UMT2 generation (1998–2006) introduced redundant CPU configurations, expanded analog I/O density, and early Modbus TCP support. The UMT3 and subsequent MicroNet Plus transition (2006–present) added IEC 61131-3 programming compatibility, Ethernet-based supervisory links, and hot-standby redundancy.

Compatibility across generations is constrained by backplane bus architecture: UMT1 modules are not electrically compatible with UMT2 backplanes without adapter kits. Firmware versioning is critical — modules must match the application software revision loaded on the master CPU. Field engineers replacing modules must verify the hardware revision suffix (e.g., /A3, /B1) against the site-specific bill of materials. The LR20523 designation on the subject module (UMT145B/A3/LR20523) refers to Woodward's internal engineering release number, which tracks PCB revision history and component substitution approvals.

As of 2024, the UMT1 and UMT2 product lines are classified by Woodward as End-of-Life (EOL). Woodward no longer manufactures replacement modules for these series. Long-term maintenance support is exclusively available through authorized third-party MRO suppliers and independent service organizations (ISOs) such as DriveKNMS.

UMT Full Catalog & Functionalities (SKU List)

CPU / Controller Modules

• UMT145B A3 LR20523: Single-board turbine control CPU, UMT1 backplane, RS-485 comms, 16-bit processor
• 5466-1000: UMT2 master controller module, dual-redundant capable, Modbus RTU host
• 5466-1001: UMT2 redundant CPU module, hot-standby pair for 5466-1000
• 5501-470: MicroNet Plus CPU module, IEC 61131-3, Ethernet supervisory port
• 5501-471: MicroNet Plus redundant CPU, matched pair for 5501-470

Analog Input Modules

• 5417-379: 8-channel analog input module, 4–20 mA, 12-bit resolution, UMT2 bus
• 5464-653: 16-channel analog input, thermocouple/RTD configurable, UMT2/MicroNet
• 5464-414: 8-channel analog input, ±10 V / 4–20 mA selectable, isolated
• 5466-258: High-speed analog input module, 4-channel, 16-bit, for vibration monitoring

Digital Input / Output Modules

• 5466-026: 32-channel digital input module, 24 VDC, UMT2 backplane
• 9905-973: 16-channel digital output module, relay contact, 2A per channel
• 9907-164: 24-channel DI module, optically isolated, UMT1/UMT2 compatible
• 9907-167: 16-channel DO module, transistor output, 24 VDC sourcing
• 9907-838: Mixed I/O module, 8 DI + 8 DO, UMT1 series

Communication & Network Modules

• 5501-380: Modbus TCP/IP communication module, dual Ethernet ports, MicroNet bus
• 5501-427: DeviceNet adapter module, scanner mode, UMT2/MicroNet backplane
• 5464-335: PROFIBUS DP slave module, 12 Mbit/s, UMT2 series

Power Supply Modules

• 5466-512: 24 VDC power supply module, 10A, UMT2 backplane, redundant-capable
• 9907-205: Dual-redundant power supply module, UMT1 series, 5 VDC / 24 VDC rails

Sourcing Hard-to-Find & Obsolete UMT Parts

With Woodward's official EOL declaration for the UMT1 and UMT2 series, the primary supply channel for replacement modules has shifted entirely to the secondary market. DriveKNMS maintains a dedicated inventory of tested UMT series modules sourced from decommissioned turbine control panels, OEM overstock, and controlled teardowns of retired systems. All modules are catalogued by part number, hardware revision, and firmware version where applicable.

Quality Control for the UMT Range

UMT series modules present specific test challenges due to their proprietary backplane bus protocol and the absence of publicly available test fixtures. DriveKNMS employs a multi-stage verification process for all UMT modules entering inventory: