FOXBORO CM902WM | 27.5 VDC 2.4A Industrial Power Supply

Description

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Product Introduction (Anti-Template)

When an I/A Series cabinet begins showing multiple unexplained power-related faults, the power module is worth checking before replacing individual control cards. FOXBORO CM902WM is an I/A Series industrial power module rated at 3 A, with selectable 100, 120, 220, or 240 VAC input and a documented 27.5 VDC output at 2.4 A continuous.

The unit belongs to the CM900 power-module family and uses a rear heat sink plus two front status LEDs for operating indication. It is also identified with the Astec AA16565 configuration in available technical references, which is useful when cross-checking legacy cabinet documentation.

FOXBORO–CM902WM label

Key Technical Specifications

The key electrical figures are the selectable AC input and 27.5 VDC / 2.4 A continuous output. These values are consistently reported for the CM902WM in available equipment references.

One procurement detail deserves attention: some inventory records identify the unit as CM902WM-A, while others simply use CM902WM. The available documentation associates CM902WM with the CM902 family and also lists CM902WL and CM902WX as related models. Match the complete nameplate and revision before treating variants as interchangeable.

FOXBORO–CM902WM front

Field Application & Technical Pitfalls (The Engineer’s Guide)

is a cabinet-level power component. That means one failing supply can create several apparently unrelated symptoms downstream—controller resets, communication interruptions, or multiple module faults at the same time.

1. I/A Series control cabinetsThe provides the DC power required by compatible I/A Series equipment. It is therefore more economical to verify the common power source before replacing several individual modules.
2. Legacy process-control installationsOlder I/A Series systems can remain operational for decades. For these installations, a tested spare can be valuable because a failed power module can create a much longer outage when the exact legacy replacement is difficult to source.
3. Power-distribution maintenanceThe 27.5 VDC output at 2.4 A continuous is the figure that matters when evaluating the load. Do not size the replacement based merely on the “3 A” family designation.

Three replacement pitfalls deserve particular attention:

• Input-selection error: Verify the input-voltage selector before energizing the unit. A module configured for 120 VAC should not simply be connected to a 240 VAC source because the housing looks identical.
• Output-load calculation: The documented continuous output is 27.5 VDC at 2.4 A. Check the actual cabinet load, especially if several downstream modules are powered from the same supply.
• Revision and variant mismatch: , -A, CM902WL, and CM902WX appear in legacy equipment records. Do not substitute solely on the CM902 prefix. Confirm the exact part and revision against the cabinet documentation.

Never change the AC input selector while the power supply is energized. Isolate the supply, verify the absence of voltage, and then confirm the selector position before reconnecting power.

Lesson learned: A technician replaces a failed and immediately gets an output voltage, so the repair appears successful. The cabinet later develops repeated resets because the replacement was configured for the wrong AC input and the upstream protection was operating abnormally.

FOXBORO–CM902WM backside

Quality Control (QC) SOP & Transparency

1. Inbound Verification
   • Verify the complete model marking .
   • Check for suffixes such as -A and record the exact revision.
   • Inspect the AC input selector and terminal arrangement.
   • Check the rear heat sink for damage or excessive corrosion.
   • Inspect both front LED indicators and the enclosure.
   • Record whether the unit is New Original, New Surplus, or Refurbished.
2. Live Rig Testing
   • Use a controlled AC source appropriate for the selected input configuration.
   • Verify the selector position before energization.
   • Confirm startup behavior and LED status.
   • Measure the DC output under no-load conditions.
   • Apply a controlled load and verify stable output at representative current levels.
   • Monitor the unit for abnormal heating, shutdown, or output instability.
3. Parameter Testing
   • Verify the selected AC input configuration.
   • Measure output voltage around the specified 27.5 VDC level.
   • Test continuous operation under an appropriate representative load.
   • Check output stability during load changes.
   • Inspect the two status indicators for normal operation.
   • Record voltage and current measurements in the QC report.
4. Final QA & Packaging
   • Record model, revision, serial information, input configuration, and test results.
   • Apply a QC-passed identification label.
   • Protect the terminals and selector from mechanical impact.
   • Use suitable electronic-equipment protective packaging.
   • Provide the applicable test record and a 12-month warranty under the agreed warranty terms.

Frequently Asked Questions (FAQ)

Q1. What is FOXBORO ?
It is a 3 A-class I/A Series industrial power module used to provide regulated DC power for compatible control-system equipment. Available technical references specify selectable 100/120/220/240 VAC input and 27.5 VDC at 2.4 A continuous output.

Q2. Is a controller or a power supply?
It is a power supply module, not a process controller or CPU. The CM900 family is specifically identified as industrial power modules for the I/A Series.

Q3. What output does it provide?
The documented output is 27.5 VDC at 2.4 A continuous. The “3 A” description refers to the module’s rated class and should not be interpreted as a 3 A continuous-output specification.

Q4. What AC input voltages are supported?
The is documented with selectable 100, 120, 220, and 240 VAC input. Verify the selector position on the actual unit before installation.

Q5. Is the same as CM902WX or CM902WL?
No. They are related members of the CM900 family, but you should not assume electrical interchangeability. CM902WL and CM902WX appear as separate models in the available product-family references.

Q6. Can be hot-swapped?
Do not assume it can. This is an AC-input power supply, and its output feeds control-system electronics. Unless the specific cabinet design and maintenance procedure explicitly permit live replacement, isolate the AC source before removing the module.

Q7. What warranty is available?
A 12-month warranty can be provided under the agreed supply terms. For a replacement order, I recommend confirming the existing revision, AC input setting, and cabinet application before shipment.

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