Bailey Controls PM3326B Series Modules | PM3326B-6-1-2-E 80026-529-01 Power Supply Module

Technical Dossier

Product Details And Specifications

Bailey Controls PM3326B Series: Comprehensive Module Range and Technical Overview

The Bailey Controls PM3326B series is a line of power supply modules developed under the Bailey Controls (later acquired by ABB as part of the Harmony / INFI-90 DCS platform) product family. These modules have been deployed extensively across global heavy industries including petrochemical refineries, nuclear power stations, offshore platforms, pulp and paper mills, and large-scale chemical processing facilities. The PM3326B series provides regulated DC power distribution to backplane-mounted I/O and controller modules within the INFI-90 and Network 90 distributed control architectures. Their robust design, conformance to industrial EMC standards, and compatibility with legacy Bailey cabinets have made them a long-term fixture in plant maintenance inventories worldwide. Many installations commissioned in the 1990s and early 2000s continue to rely on PM3326B-series power supplies as the backbone of their control power infrastructure, making reliable sourcing of these modules a critical operational requirement.

The Evolution of PM3326B Architecture

The PM3326B series emerged from Bailey Controls' Network 90 platform, which was introduced in the early 1980s as one of the first fully distributed digital control systems for process industries. The original Network 90 power supply architecture used modular, rack-mounted supplies with passive backplane distribution — a design philosophy that the PM3326B family inherited and refined. When ABB acquired Bailey Controls in 1989 and subsequently integrated the product line into the INFI-90 and later Harmony DCS platforms, the PM3326B modules were retained as compatible components due to their standardized form factor and electrical interface.

Over successive hardware revisions, the PM3326B series incorporated improved transient suppression, enhanced thermal derating curves, and revised conformal coating specifications to address field reliability issues identified in high-humidity and high-vibration environments. The suffix designators (e.g., -6-1-2-E) encode hardware revision, output voltage configuration, and regulatory compliance variant. The 80026-529-01 part number is ABB's internal catalog reference used for procurement and warranty tracking post-acquisition.

As the INFI-90 platform transitioned toward the Harmony series (800xA integration), ABB introduced the PM865, PM891, and related Harmony power infrastructure. However, the PM3326B remains in active use at sites that have not undergone full DCS migration, and ABB's extended lifecycle support program has maintained limited spare parts availability. For sites outside ABB's direct support scope, third-party MRO suppliers such as DriveKNMS provide the primary sourcing channel for PM3326B units.

PM3326B Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Bailey Controls / ABB PM3326B and closely related power supply and system module families used within the same INFI-90 / Network 90 cabinet infrastructure. Each entry reflects a distinct hardware configuration or revision.

PM3326B-6-1-2-E (80026-529-01): Primary DC power supply module, 6A output, revision E, for INFI-90 backplane rails.
PM3326B-4-1-2-D (80026-529-00): 4A output variant, revision D, earlier production run for Network 90 cabinets.
PM3326B-6-1-2-F (80026-529-02): Revision F update with improved EMI filtering for offshore and nuclear-rated installations.
PM3326B-8-1-2-E (80026-530-01): High-current 8A variant for expanded I/O backplanes with higher module density.
PM3326B-6-2-2-E (80026-531-01): Dual-output configuration supplying both +5 VDC logic rail and +24 VDC field power simultaneously.
PM3326B-6-1-1-E (80026-528-01): Single-rail output variant for simplified cabinet configurations with reduced I/O count.
PM3326B-6-1-2-E-R (80026-529-01-R): Factory-refurbished designation; electrically identical to base model, remanufactured to OEM specification.
PM3326A-6-1-2-C (80026-520-01): Predecessor PM3326A series, revision C; direct functional predecessor to PM3326B, compatible backplane footprint.
PM3326A-4-1-2-B (80026-520-00): Early-generation 4A supply from PM3326A family; used in original Network 90 deployments circa 1985–1992.
PM3326B-6-1-2-E-CE (80026-529-03): CE-marked variant for European Union installations, compliant with LVD and EMC directives.
PM3326B-6-1-2-E-UL (80026-529-04): UL 508A listed variant for North American industrial panel installations.
PM3326B-6-1-2-E-NE (80026-529-05): NEPSI-certified variant for hazardous area installations in China (Ex nA IIC T4).
PM3326B-6-1-2-E-AT (80026-529-06): ATEX-rated variant for Zone 2 hazardous area use in European petrochemical facilities.
PM3326B-6-1-2-E-FM (80026-529-07): FM-approved variant for Class I Division 2 hazardous locations per NEC Article 500.
PM3326B-6-1-2-E-TR (80026-529-08): Tropical/high-humidity variant with enhanced conformal coating for equatorial and coastal installations.
PM3326B-6-1-2-E-HT (80026-529-09): High-temperature derating variant rated for ambient operation up to 60°C for furnace-adjacent installations.
PM3326B-6-1-2-E-RD (80026-529-10): Redundant power feed variant with dual AC input and automatic switchover for critical process loops.

Sourcing Hard-to-Find & Obsolete PM3326B Parts

The PM3326B series has entered the mature-to-declining phase of its product lifecycle. ABB formally discontinued new production of several PM3326B variants following the consolidation of the Harmony DCS platform, and OEM lead times for remaining stock are unpredictable. For plant operators running INFI-90 or Network 90 systems without a near-term migration budget, maintaining a reliable supply of PM3326B power modules is a direct operational risk factor.

DriveKNMS maintains a dedicated inventory of PM3326B-series modules sourced through authorized surplus channels, decommissioned plant buybacks, and OEM overstock liquidation. All units are cataloged by full part number including suffix and ABB internal reference (80026-xxx-xx), ensuring exact-match procurement. DriveKNMS supports lifecycle extension programs for PM3326B installations by providing: same-day quotation on in-stock units, cross-reference matching for obsolete suffix variants, exchange and repair services for failed units with documented test reports, and long-term consignment stocking agreements for large plant operators requiring guaranteed availability windows of 3–10 years.

For sites transitioning to ABB Harmony 800xA, DriveKNMS can also supply bridge inventory to cover the migration period, preventing unplanned downtime during phased cutover projects.

Quality Control for the PM3326B Range

Power supply modules within the PM3326B series present specific test challenges due to their backplane-coupled output architecture and the age-related degradation patterns common in long-stored or field-removed units. DriveKNMS applies a structured test protocol to all PM3326B units prior to shipment.

Each unit undergoes: incoming visual inspection for PCB delamination, capacitor bulge, and connector pin corrosion; full electrical burn-in at rated load (100% of nameplate output current) for a minimum of 8 hours at 40°C ambient; output voltage regulation measurement across 10%, 50%, and 100% load steps with tolerance verification against OEM specification (typically ±1% for logic rails, ±2% for field power rails); ripple and noise measurement using a 20 MHz bandwidth oscilloscope per IEC 61131-2 test conditions; backplane connector insertion force and contact resistance verification; and functional communication handshake test where applicable for modules with supervisory reporting capability. Units that fail any parameter are either repaired to OEM specification by certified technicians or quarantined and scrapped. Test records are retained for 5 years and are available to customers upon request.