Cameron AAP3798102-00031 Main Logic Module

Description

Product Introduction & Engineering Value

The Cameron AAP3798102-00031 belongs to the control architecture used on Cameron/Cooper Compression centrifugal compressor packages. It is not a generic PLC processor that should be substituted solely by matching voltage, communication ports, or physical dimensions. The controller’s application, stored configuration, and compatibility with the compressor’s control architecture are critical.

Historical parts documentation also associates this number with the Maestro Legend controller family and specifically lists it as a controller for the TA9000. That makes the exact part-number match more important than generic descriptions such as “DCS processor” or “universal I/O module.”

Technical Specifications

Important Specification Note

Public aftermarket pages contain conflicting descriptions for this part number. Some current listings call it a processor module, while another source incorrectly identifies it as a displacement-sensing component. Historical Cameron/Cooper documentation and multiple independent parts records instead identify AAP3798102-00031 as a Maestro Main Logic Module / logic module.

For that reason, specifications such as input voltage, processor type, RAM/ROM capacity, Modbus interface, operating temperature, IP rating, and I/O channel count should not be treated as verified specifications for AAP3798102-00031 unless they are confirmed from the actual Cameron documentation or the module’s identification plate.

Field Application & Engineering Use

Cameron TA9000 Compressor Control

Historical compressor-parts listings specifically associate AAP3798102-00031 with the Maestro Legend controller for the TA9000. In this application, the module forms part of the compressor control architecture rather than acting as a standalone generic PLC card.

Legacy Maestro Control Systems

The Maestro control system uses separate controller components. Historical documentation shows distinct User Interface Module (UIM) and Main Logic Module (MLM) assemblies, demonstrating why these part numbers should not be interchanged based only on similar physical appearance.

Compressor Retrofit and Obsolescence Support

For older centrifugal compressor installations, maintaining an original logic module can be important when the installed control architecture, application configuration, and field wiring are still serviceable. Bay Controls specifically lists AAP3798102-00031 among legacy Cameron replacement parts and identifies its own replacement as an MLM.

AAP3798102-00031

AAP3798102-00031

QA & Testing SOP

For a legacy controller such as AAP3798102-00031, a simple continuity check is not sufficient.

1. Part-number verification

• Confirm the complete marking: .
• Check manufacturer markings and board identification.
• Record revision or hardware identifiers before installation.

2. Physical inspection

• Inspect PCB surfaces for corrosion, contamination, cracked components, or unauthorized repair work.
• Check connectors, sockets, mounting hardware, and edge contacts.
• Look for evidence of previous overheating or liquid contamination.

3. Power-up inspection

• Use a controlled test fixture appropriate for the Maestro controller architecture.
• Verify startup behavior and abnormal current draw.
• Check diagnostic indicators where provided.

4. Controller-level testing

• Confirm the module is recognized by the compatible control system.
• Verify controller startup and communication with associated system components.
• Check available diagnostics and fault indications.

5. Application/configuration verification

• Preserve the existing controller configuration before replacement whenever the installed system permits it.
• Confirm that the replacement hardware is compatible with the existing compressor control configuration.
• Do not assume that a physically identical module contains the same application configuration.

6. Final system test

• Verify compressor control-system status before returning the machine to service.
• Confirm permissives, alarms, interlocks, sequencing, and operator-interface communication according to the approved commissioning procedure.

For New Surplus stock, authenticity should be established from the physical Cameron identification, part number, condition, traceability where available, and functional test records. A supplier’s “new” label alone does not prove OEM factory-new status.

Veteran’s Tech Trap Guide

⚠️ Trap 1 — Confusing the MLM with the UIM

The Maestro architecture uses separate control components. Historical documentation identifies UIM and MLM as different modules with different part numbers. Do not substitute an operator-interface module because the enclosure or connector arrangement looks similar.

⚠️ Trap 2 — Treating AAP3798102-00031 as a generic PLC CPU

This is a compressor-control-system spare, not a universal PLC processor. The correct replacement depends on the Cameron/Cooper control architecture and compressor application.

⚠️ Trap 3 — Trusting every online technical specification

Several aftermarket listings publish mutually incompatible specifications for this exact part number. One even describes it as a displacement sensor, while historical records identify it as a logic module. Those descriptions should not be mixed into an engineering specification sheet.

PRO TIP: When requesting a replacement, provide the complete AAP3798102-00031 number plus the compressor model, controller family, module revision, and photographs of the installed module. This gives the supplier enough information to distinguish the MLM from related Maestro components.

FAQ

What is Cameron AAP3798102-00031?

It is a Main Logic Module (MLM) associated with Cameron/Cooper Compression Maestro compressor control systems. Historical records also identify it as a Maestro logic module and associate it with centrifugal compressor equipment.

Is AAP3798102-00031 a PLC processor?

It performs the central logic/control role within the applicable Maestro architecture, but it should not be treated as a generic PLC CPU. Compatibility with the specific Cameron compressor control system must be verified before replacement.

Which compressor is associated with this part number?

Available parts records specifically associate AAP3798102-00031 with the Maestro Legend controller for the TA9000. Other Maestro configurations may use different AAP3798102 part numbers.

Is the UIM?

The strongest evidence indicates no. Historical documentation distinguishes the User Interface Module from the Main Logic Module, and Bay Controls identifies AAP3798102-00031 as an MLM. Some online listings incorrectly call it an operation panel or UIM, so the exact part number should take precedence over generic product titles.

Can I replace it with AAP3798102-00037?

Do not assume interchangeability. Bay Controls identifies AAP3798102-00037 as a UIM, while AAP3798102-00031 is identified as an MLM. They serve different roles in the control architecture.

Is AAP3798102-00031 still available from Cameron?

The part is primarily encountered through the legacy/industrial-spares market. Bay Controls states that replacement MLMs and UIMs for legacy V-Series controllers are no longer available as original OEM parts and offers replacement retrofit solutions.

What should be checked before purchasing New Surplus stock?

Verify the complete part number, physical label, hardware revision, compressor/control-system compatibility, storage condition, and available functional-test documentation. For a legacy control module, those checks are more meaningful than relying on a generic marketplace description.

What warranty should be specified?

The warranty should come from the actual supplier and be stated separately from any Cameron/OEM warranty claim. If the item is New Surplus, ask for the supplier’s wr