ORAM LPS 850 Modules: 295-900913-00 740-805201-02 R36SSNA-R2-NS-NV-06 Power Supply Box Module

Technical Dossier

Product Details And Specifications

ORAM LPS 850 Series: Comprehensive Module Range and Technical Overview

The ORAM LPS 850 series represents a class of industrial power supply and distribution modules deployed extensively across heavy-process industries including petrochemical refineries, offshore platforms, nuclear auxiliary systems, and continuous-process chemical plants. These units serve as the backbone of distributed control system (DCS) power architectures, providing regulated, conditioned DC power to field I/O racks, controller backplanes, and communication subsystems. Their ruggedized design targets 24/7 continuous operation in Class I Division 2 and ATEX Zone 2 environments. The LPS 850 platform is recognized for its modular form factor, allowing hot-swap replacement without full system shutdown — a critical requirement in facilities where process interruption carries significant safety and financial consequences.

The Evolution of LPS 850 Architecture

The LPS 850 series emerged as part of ORAM's second-generation DCS power infrastructure strategy, succeeding earlier single-rail linear supply designs that lacked redundancy and remote diagnostics capability. Early LPS 850 variants (R1x revisions) provided basic 24 VDC regulated output with manual reset overcurrent protection. Subsequent revisions introduced dual-rail output configurations, passive current sharing for N+1 redundancy, and backplane bus communication for fault reporting to the host controller.

The R36SSNA-R2 revision — as represented by SKU 295-900913-00 / 740-805201-02 / R36SSNA-R2-NS-NV-06 — incorporates non-volatile (NV) fault logging and non-supervised (NS) alarm output modes, indicating its deployment in architectures where the DCS historian captures power events independently of the alarm management layer. Compatibility with legacy LPS 800 backplanes was maintained through the R2x generation, but R3x and later revisions introduced a revised connector pitch that requires adapter brackets when retrofitting older enclosures. Facilities running mixed-revision LPS 850 populations must verify backplane revision codes before ordering replacement units.

LPS 850 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ORAM LPS 850 power supply series, organized by functional sub-category:

Primary Power Supply Modules

• 295-900913-00: Main LPS 850 power supply box module, 24 VDC regulated output, R36SSNA-R2-NS-NV-06 revision
• 740-805201-02: Alternate part number / assembly revision for 295-900913-00; same functional specification
• 295-900912-00: LPS 850 base power supply, earlier R1x revision, single-rail output, no NV logging
• 295-900914-00: LPS 850 high-current variant, extended output capacity for high-density I/O racks
• 295-900915-00: LPS 850 redundant pair module, dual-output with active current sharing
• 295-900916-00: LPS 850 power supply with integrated EMI filter stage for sensitive analog I/O environments

Power Distribution & Bus Modules

• 295-900920-00: LPS 850 power distribution module, 8-channel fused output for field device loops
• 295-900921-00: LPS 850 bus termination and distribution card, DIN-rail mount
• 295-900922-00: LPS 850 backplane power interface module, bridges PSU output to controller rack bus
• 295-900923-00: LPS 850 field power isolator module, galvanic isolation for hazardous area loops

Monitoring & Diagnostics Modules

• 295-900930-00: LPS 850 power monitor module, real-time voltage/current telemetry to DCS historian
• 295-900931-00: LPS 850 fault annunciator card, hardwired alarm relay outputs for SIS integration
• 295-900932-00: LPS 850 NV event logger module, non-volatile fault capture, 512-event buffer

Ancillary & Replacement Components

• 740-805200-01: LPS 850 internal fuse assembly, field-replaceable, 10 A slow-blow
• 740-805202-00: LPS 850 connector housing kit, R3x backplane revision, includes locking clips
• 740-805203-00: LPS 850 fan tray assembly, forced-air cooling for high-ambient installations
• 740-805204-01: LPS 850 mounting bracket adapter, R1x-to-R3x backplane retrofit kit

Sourcing Hard-to-Find & Obsolete LPS 850 Parts

The ORAM LPS 850 series has entered the mature-to-declining phase of its product lifecycle. ORAM's official support window for R1x and R2x revisions has closed, and new production of several sub-assemblies has been discontinued. For facilities operating legacy DCS installations built around the LPS 850 platform, DriveKNMS provides structured lifecycle extension services:

• Verified surplus stock: DriveKNMS maintains a continuously updated inventory of tested LPS 850 modules sourced from decommissioned plant equipment, OEM overstock, and authorized distributor liquidations.
• Cross-reference matching: Multiple part numbers (e.g., 295-900913-00 and 740-805201-02) reference the same physical assembly at different revision stages. DriveKNMS engineers verify functional equivalence before shipment.
• Long-lead procurement: For SKUs not in immediate stock, DriveKNMS activates its global sourcing network across North America, Europe, and Asia-Pacific to locate units within defined lead times.
• Repair and refurbishment: Select LPS 850 modules are eligible for board-level repair, including capacitor replacement, connector reconditioning, and firmware re-flash where applicable.

Quality Control for the LPS 850 Range

LPS 850 power supply modules present specific test challenges due to their multi-rail output architecture, backplane bus communication interface, and NV memory subsystems. DriveKNMS applies the following test protocol to all LPS 850 units prior to dispatch:

• Load bank testing: Each unit is subjected to full-rated load for a minimum burn-in period to screen for latent component failures and thermal drift.
• Output regulation verification: DC output voltage is measured at no-load, 50% load, and 100% load conditions. Ripple and noise are measured against OEM specification limits.
• Backplane bus communication test: Where applicable, the module's serial diagnostic interface is exercised using a reference backplane fixture to confirm fault reporting and NV log read/write integrity.
• Overcurrent and overvoltage protection test: Protection circuits are verified by controlled fault injection. Reset behavior (auto-reset vs. manual-reset) is confirmed against the revision specification.
• Insulation resistance test: Hi-pot testing is performed between input, output, and chassis ground to verify dielectric integrity of isolation barriers.
• Visual and mechanical inspection: Connector pins, locking mechanisms, PCB surfaces, and enclosure integrity are inspected against a documented acceptance checklist.

All test results are documented and available upon request with each shipment.