2MLP-ACF2 Honeywell Free-Voltage AC Power Supply

Description

Product Model: 2MLP-ACF2
Product Brand: Honeywell
Product Series: MasterLogic-200 / Power Supply Modules

Key Features:

• Free-voltage AC input range (85 V to 264 V AC) for global operation
• Dual DC outputs: 5 V @ 6 A and 24 V @ 0.6 A to power CPU and I/O modules
• Built-in protections: overcurrent, overvoltage, short-circuit, and internal fuse
• LED voltage indicator and RUN relay contact (24 V DC, 0.5 A)

Product Role & System Fit

In the Honeywell MasterLogic-200 (ML200) PLC ecosystem, modules require a reliable power backbone. The 2MLP-ACF2 is one of the dedicated power supply modules that feed the I/O base, logic modules, expansion racks, and associated electronics. It is not a CPU or I/O card; instead, its job is to convert incoming AC to regulated DC power for the entire ML200 infrastructure.

Specifically, it takes a wide AC input (100–240 V) — often called “free-voltage” input — and produces stable 5 V DC at up to 6 A for the system. That 5 V rail serves logic boards, signal modules, and internal circuitry.

Because MasterLogic systems often include various expansion or I/O modules (analog, digital, communication), having a robust power module like 2MLP-ACF2 ensures that the system remains powered even under maximum load.

In many installations, designers choose 2MLP-ACF2 over its sibling modules (e.g. 2MLP-ACF1) when they anticipate heavier I/O loads or future expansion, since it provides higher current capacity on the 5 V rail.

However, 2MLP-ACF2 is now considered discontinued by Honeywell, meaning it is generally obtained via surplus, refurbished inventories, or repair channels.  When replacing or refurbishing ML200 systems, it is one of the common points of failure or bottleneck if modules were added beyond its original load capacity.

Technical Features & Benefits

Let’s unpack what makes 2MLP-ACF2 special (and what constraints to watch out for).

Input / Output Ratings

• AC Input Range: 100 to 240 V AC (free-voltage input), compatible with global mains standards.
• DC Output: 5 V DC, up to 6 A continuous. This is its key rating in most datasheets.
• Power Rating: Vendor listings cite 185 VA input spec as part of its design envelope.

Because power modules must tolerate fluctuations, the overdesign (VA > nominal 5 V × current) helps accommodate inrush, transient loads, and internal losses (inefficiency, internal regulation overhead).

Interface & Construction

The module uses screw terminal blocks (M3 screws) for AC input and DC output wiring. The terminals are made from PBT (a thermoplastic), and the terminal torque is specified at > 6.2 kgf·cm.
The weight of the module is modest: approximately 186 g.

Given its role, it is installed in the ML200 base or power module slot and integrates with the backplane to feed the base and modules.

Reliability & Legacy Considerations

• Because 2MLP-ACF2 is discontinued, sourcing relies on surplus or refurbishment sources.
• Many suppliers (e.g. Radwell) offer them with warranties or guarantee repairability. Radwell lists both “never used original packaging” and refurbished units, and an in-house 2-year warranty on parts they sell/repair.
• It is critical to match the module’s current capacity with the planned I/O load, as overloading the 5 V bus can cause voltage drop, module misbehavior, or instability.

Because the ML200 architecture places the 5 V supply at the heart of system logic, failure or undercurrent in the power module can cause widespread fault across logic and I/O modules.

Technical Specifications Table

Here’s a clean spec summary for 2MLP-ACF2, suitable for your catalog or reference. Always double-check with the actual unit’s label or service manual.

This table gives a dependable baseline for design, spares, and replacement checks.

Installation & Maintenance Insights

Power modules like 2MLP-ACF2 seem simple, but proper installation ensures long-term stability.

Mounting & Ventilation

Mount the module in a standard ML200 base/power slot with sufficient spacing. Don’t crowd it with high-heat modules — leave clearance for cooling.
Ensure ambient temperature stays within ML200 spec (commonly 0–55 °C) to avoid thermal stress.

Wiring & Connections

Use proper gauge wiring for AC input and 5 V output. Because the module handles up to 6 A, undervalued wiring can cause voltage drops.
Tighten terminal screws to recommended torque (≥ 6.2 kgf·cm) to avoid loose connections or contact resistance.
Maintain polarity correctness (AC input lines, DC 5 V output +/–) — though the module may accept wide AC input, correctness matters.

Load Balancing & Capacity

Sum up all I/O modules, logic modules, and accessories powered from the 5 V bus. Ensure total current draw stays below 6 A with margin. If you plan future expansion, consider oversizing or redundant power modules.
Avoid sudden large transient loads that might cause voltage drop or module protection trip.

Troubleshooting & Diagnostics

If modules downstream experience undervoltage, resets, or erratic behavior, test the 5 V line first. Use a multimeter under load to observe voltage stability.
Check for signs of heating, discoloration, or scorching at terminals — signals of overload or poor contact.
Because this module is discontinued, verifying part numbers, revision codes, and labeling is essential when replacing.

Spare / Replacement Strategy

Because 2MLP-ACF2 is discontinued, maintain one or more in spare stock. Use refurbished parts from reputable vendors with test guarantees.
Always verify that replacement modules have identical output current rating and wiring footprint to avoid compatibility issues.

Related Modules / Family

Within Honeywell’s ML200 power module family, several variants exist:

• 2MLP-ACF1 — similar AC input module but with lower output (5 V, 3 A plus 24 V 0.6 A)
• 2MLP-AC23 — designed for AC 220 V input, 5 V output at 8.5 A
• 2MLP-DC42 — DC-input power module (24 V DC in) for systems using DC supply infrastructure

These options allow tailoring the power infrastructure depending on plant supply (AC or DC), load capacity, and redundancy needs.