ABB PHARPS32 Power Supply Modules: PHARPS322000000

Technical Dossier

Product Details And Specifications

ABB PHARPS32 Series: Comprehensive Module Range and Technical Overview

The ABB PHARPS32 series is a family of redundant power supply modules engineered for deployment within ABB's Advant OCS / Master Bus 300 distributed control system architecture. These units are installed across critical continuous-process industries including petrochemical refineries, offshore oil and gas platforms, nuclear auxiliary systems, pulp and paper mills, and large-scale power generation facilities. The PHARPS32 series provides regulated DC power distribution to controller backplanes and I/O subsystems, supporting 24 VDC bus rails with built-in redundancy switching. Its modular form factor allows hot-swap replacement without process interruption, a requirement in facilities operating under IEC 61511 functional safety constraints. Global installed base spans facilities in Europe, the Middle East, and Asia-Pacific, many of which have operated continuous runs exceeding 20 years on this platform.

The Evolution of PHARPS32 Architecture

The PHARPS32 series was introduced as part of ABB's Advant Controller 450 (AC450) and AC410 ecosystem during the late 1980s and early 1990s, succeeding earlier RASK and DSPC power distribution modules from the PROCONTIC and MASTER lineages. The architecture is built around a passive backplane bus (MB300 bus) with the power supply acting as the primary bus voltage regulator and fault isolator.

Early revisions of the PHARPS32 used discrete linear regulation stages. Later hardware revisions incorporated switched-mode regulation with improved efficiency and tighter output tolerance (±1% on 24 VDC rail). The series supports parallel redundant operation via the PHARPS32R redundancy module, enabling N+1 configurations. Compatibility with the MB300 backplane is maintained across all hardware revisions, though firmware-level diagnostics vary between early and late production units. ABB formally discontinued active production of the PHARPS32 series as the platform transitioned toward the System 800xA architecture and AC800M controllers. The PHARPS32 is now classified as a mature/end-of-life product line; ABB no longer manufactures replacement units, making third-party MRO sourcing the primary supply channel for ongoing maintenance.

PHARPS32 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ABB PHARPS32 power supply and associated backplane power distribution family. Each entry reflects a distinct hardware configuration or accessory role within the MB300 bus architecture.

PHARPS322000000: 24 VDC redundant power supply module, standard output rating, MB300 bus compatible, hot-swap capable.
PHARPS321000000: Single-channel 24 VDC power supply, non-redundant configuration, for low-criticality subsystems.
PHARPS323000000: High-current output variant, supports expanded I/O backplane configurations with increased load capacity.
PHARPS32R: Redundancy switching module, pairs with dual PHARPS322000000 units for automatic failover on power fault.
PHARPS324000000: Extended temperature range power supply, rated for ambient operation up to 60°C, for non-climate-controlled enclosures.
PHARPS325000000: 48 VDC input variant, accepts wide-range DC bus input for battery-backed UPS integration.
PHARPS326000000: Diagnostic-enhanced revision with onboard LED fault annunciation and HART-compatible status output.
PHARPS32F: Fuse and protection module, provides overcurrent protection for individual backplane slots downstream of the main supply.
PHARPS32C: Capacitor buffer module, extends holdup time during momentary AC input interruptions, typically 20–50 ms.
PHARPS32T: Test and calibration adapter, used for bench verification of output voltage and current limit settings.
PHARPS321500000: Mid-range output power supply, positioned between single and dual-channel variants for medium-density I/O racks.
PHARPS32A: AC input variant, accepts 115/230 VAC directly without external AC/DC converter stage.
PHARPS32B: Backplane distribution board, routes power from PHARPS32 supply to individual module slots across a 16-slot rack.
PHARPS32D: Dual-output module, provides independent 24 VDC and 5 VDC rails for mixed-voltage backplane configurations.
PHARPS32E: EMC-hardened variant, includes additional filtering for installations in high-electromagnetic-interference environments such as motor control centers.
PHARPS32G: Ground fault detection module, monitors insulation resistance on the 24 VDC bus and triggers alarm on degradation below threshold.

Sourcing Hard-to-Find & Obsolete PHARPS32 Parts

DriveKNMS maintains a dedicated inventory program for ABB Advant and MB300 platform components, including the full PHARPS32 power supply family. As ABB has ceased production of this series, the primary sourcing channels are decommissioned plant equipment, authorized surplus distributors, and tested-used stock from controlled dismantling projects.

DriveKNMS sources PHARPS32 units through a verified supply chain that includes former ABB system integrators, refinery turnaround surplus, and direct acquisition from plant asset liquidations. All units are catalogued by hardware revision and production date code prior to listing. For customers requiring long-term maintenance agreements (LTMAs) covering multi-year PHARPS32 spare parts supply, DriveKNMS offers forward-stocking arrangements with guaranteed unit availability windows. This service is specifically designed for facilities that cannot migrate to System 800xA within their current capital planning cycle and must sustain the existing Advant platform for 5–15 additional years.

Quality Control for the PHARPS32 Range

Each PHARPS32 unit processed by DriveKNMS undergoes a structured inspection and functional test protocol before dispatch. The procedure addresses the specific failure modes documented in ABB's field service bulletins for this series, including capacitor degradation on the DC bus filter stage, relay contact wear on the redundancy switchover circuit, and corrosion on the MB300 bus edge connector.

Test procedure steps: (1) Visual inspection of PCB for corrosion, burn marks, and component displacement. (2) DC output voltage measurement at no-load and full-rated-load conditions, verified against ABB specification tolerance of ±1%. (3) Redundancy switchover simulation: primary supply is interrupted and failover time to secondary is measured; acceptable threshold is under 10 ms. (4) Ripple and noise measurement on the 24 VDC output rail using oscilloscope, compared against ABB's published ripple specification. (5) Thermal soak test at rated load for 2 hours minimum, with output voltage monitored for drift. (6) MB300 bus connector continuity and contact resistance test using four-wire Kelvin measurement. Units that pass all stages are issued a DriveKNMS test certificate with date, technician ID, and measured values recorded.