PDMA MTAP2 Modules: MTAP2 PCB-00322-REVD Motor Test Access Port —

Technical Dossier

Product Details And Specifications

PDMA MTAP2 Series: Comprehensive Module Range and Technical Overview

The PDMA MTAP2 series represents a purpose-built platform for motor test access and diagnostics, deployed across heavy industrial sectors including petrochemical refineries, offshore platforms, nuclear power generation facilities, and continuous-process chemical plants. The MTAP2 architecture provides standardized access port interfaces for motor control and diagnostic signal routing, enabling maintenance engineers to perform in-situ testing without interrupting production circuits. Its modular PCB-level design allows component-level replacement, a critical requirement in facilities where mean time to repair (MTTR) directly impacts operational revenue. The MTAP2 series has established a significant installed base in North American and European industrial facilities, where long equipment lifecycles (15–30 years) make spare parts availability a primary procurement concern.

The Evolution of MTAP2 Architecture

The MTAP2 platform was developed by PDMA Corporation to address the need for standardized motor test access in variable-speed drive and motor protection applications. Early revisions (REV A, REV B) established the core PCB form factor and signal interface standard, providing analog test point access for voltage, current, and speed feedback signals. REV C introduced enhanced EMI shielding and revised connector pinouts to address field-reported noise coupling issues in high-frequency drive environments. REV D (PCB-00322-REVD), the current reference revision, incorporates revised trace routing for improved signal integrity, updated component specifications for extended temperature range operation, and modified test point labeling conforming to IEC 60204-1 safety marking requirements.

Compatibility across revisions is generally maintained at the system interface level, but PCB-level substitution between REV A/B and REV C/D requires verification of connector pinout compatibility. Facilities operating mixed-revision installations should maintain revision-specific spare stock to avoid field substitution errors. As the MTAP2 series has entered the mature/end-of-production phase, PDMA no longer manufactures new units through standard distribution channels. Long-term maintenance support is now the primary procurement driver for this series.

MTAP2 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented MTAP2 series range, organized by functional category. Each entry reflects a distinct board revision or configuration variant within the PDMA MTAP2 platform.

Motor Test Access Port — Core PCB Assemblies

• MTAP2 PCB-00322-REVA: Original production revision; analog test point access board, standard pinout.
• MTAP2 PCB-00322-REVB: Minor BOM revision; updated passive component tolerances, same form/fit/function as REV A.
• MTAP2 PCB-00322-REVC: Enhanced EMI shielding; revised connector pinout; improved noise immunity for VFD environments.
• MTAP2 PCB-00322-REVD: Current reference revision; optimized trace routing; extended temperature range; IEC 60204-1 compliant labeling.
• MTAP2 PCB-00322-REVE: Late-production variant; component substitutions for EOL parts; functionally equivalent to REV D.

Signal Interface & Connector Sub-Assemblies

• MTAP2 PCB-00345-REVA: Auxiliary signal breakout board; extends test point access to secondary motor feedback channels.
• MTAP2 PCB-00345-REVB: Revised breakout board; updated terminal block specification for higher current rating.
• MTAP2 PCB-00356-REVA: Encoder interface sub-board; provides quadrature encoder signal conditioning for MTAP2 host assembly.
• MTAP2 PCB-00356-REVB: Encoder interface, REV B; added differential line driver output stage.
• MTAP2 PCB-00378-REVA: Analog output conditioning board; 4–20 mA signal conversion for process instrumentation integration.

Power Supply & Regulation Modules

• MTAP2 PCB-00401-REVA: Onboard DC/DC converter module; provides isolated 5 VDC and 15 VDC rails for MTAP2 signal circuitry.
• MTAP2 PCB-00401-REVB: Power module REV B; increased output current capacity; improved thermal management.
• MTAP2 PCB-00415-REVA: Bulk capacitor and filter board; input EMI filtering for MTAP2 power supply section.

Communication & Diagnostic Interface Boards

• MTAP2 PCB-00422-REVA: Serial diagnostic interface board; RS-232/RS-485 port for external test equipment connectivity.
• MTAP2 PCB-00422-REVB: Diagnostic interface REV B; added optoisolated RS-485 port; improved ground isolation.
• MTAP2 PCB-00435-REVA: Status indicator and alarm output board; discrete I/O for fault annunciation integration with plant DCS.
• MTAP2 PCB-00435-REVB: Alarm output board REV B; expanded I/O count; compatible with 24 VDC and 120 VAC annunciator systems.

Sourcing Hard-to-Find & Obsolete MTAP2 Parts

The MTAP2 series has reached end-of-production status with PDMA Corporation. Standard distribution channels no longer carry new inventory for most PCB-level assemblies, and lead times through OEM repair programs are extended or unavailable. DriveKNMS maintains a dedicated inventory of MTAP2 assemblies sourced through controlled secondary market channels, including decommissioned plant equipment, authorized surplus dealers, and direct acquisition from facilities undergoing technology upgrades.

All MTAP2 units in DriveKNMS inventory are subject to full incoming inspection and functional verification before being offered for sale. Revision-specific sourcing is available: customers requiring a specific REV level (e.g., PCB-00322-REVD) for direct board-level substitution can specify their requirement at the time of inquiry. DriveKNMS also supports cross-revision compatibility assessment for customers who need to substitute an unavailable revision with a functionally equivalent alternative. For facilities with long-term maintenance contracts requiring guaranteed MTAP2 spare parts availability, DriveKNMS offers consignment stock and reserved inventory programs.

Quality Control for the MTAP2 Range

MTAP2 PCB assemblies present specific test challenges due to their role as signal interface and conditioning boards operating in electrically noisy industrial environments. DriveKNMS applies the following test protocol to all MTAP2 units:

• Visual Inspection: Full board inspection under magnification for solder joint integrity, component condition, corrosion, and mechanical damage. Connector pins and test point hardware are individually inspected.
• Isolation Resistance Test: Megohmmeter test applied across isolated circuit sections to verify dielectric integrity of optoisolators and DC/DC converter isolation barriers.
• Power-On Functional Test: Board powered at rated input voltage; all DC rail outputs measured and verified against specification. Quiescent current draw compared to reference values.
• Signal Path Verification: Known test signals injected at input test points; output signals measured and compared to expected transfer function. Applicable to analog conditioning, encoder interface, and serial communication boards.
• Thermal Cycling: Selected units subjected to thermal cycling per IPC-9701 guidelines to screen for latent solder joint defects common in aged PCB assemblies.
• Revision Verification: PCB revision marking, component BOM, and connector pinout verified against PDMA documentation to confirm accurate revision identification prior to shipment.