Honeywell 2MLR-AC23 Power Supply Module | MasterLogic 200

Product Overview

The Honeywell 2MLR-AC23 is a power supply module designed for industrial PLC control systems. It accepts a nominal 220VAC input and provides a regulated 5VDC output. Its rated output current reaches 7.5A, with a maximum output power of 37.5W at 55°C. The module supports stable DC power distribution for compatible control hardware. It also provides a dedicated RUN status contact for external monitoring. Key features include:

• AC Input: 220VAC nominal voltage.
• DC Output: 5VDC regulated voltage.
• Rated Output Current: 7.5A.
• Output Power: 37.5W at 55°C.
• Voltage Monitoring: LED indication for normal output voltage.
• RUN Contact: External operating status monitoring.
• Protection: Built-in input fuses and output overcurrent protection.

Technical Specifications

Product Identification

Input Characteristics

Output Characteristics

Protection and Monitoring

RUN Contact Specifications

Mechanical and Wiring Specifications

Installation Guidelines

Proper installation helps maintain stable power delivery and reliable PLC operation. 1. Mounting Requirements

• Check the installation position before mounting.
• Confirm sufficient cabinet clearance.
• Maintain adequate ventilation around the module.
• Secure the module according to system instructions.
• Avoid locations with excessive vibration or moisture.

2. AC Input Wiring

• Verify the supply voltage before connection.
• Keep the input voltage within 176–264VAC.
• Use cables within the specified 0.75–2mm² range.
• Select suitable crimp terminals for the cable size.
• Check terminal tightness before energizing the system.

3. DC Output Wiring

• Verify output polarity before connecting the load.
• Confirm that connected equipment requires 5VDC.
• Keep the total load within the 7.5A rating.
• Check terminal connections for loose contacts.
• Prevent short circuits during installation.

4. RUN Contact Wiring

• Use the RUN contact for external status monitoring.
• Keep switching voltage within the 24VDC rating.
• Do not exceed the 0.5A rated switching current.
• Check external circuit requirements before connection.

Commissioning and Maintenance

A structured commissioning procedure helps identify wiring and loading problems. Initial Commissioning

1. Inspect the housing and terminals for physical damage.
2. Verify the AC input wiring and supply voltage.
3. Check the DC output connections and polarity.
4. Energize the module under controlled conditions.
5. Confirm that the voltage status LED turns ON.
6. Measure the output voltage with a calibrated multimeter.
7. Verify the RUN contact response through the external circuit.
8. Apply the operating load and check output stability.

Routine Maintenance

• Inspect terminal connections during scheduled maintenance.
• Check output voltage under normal operating loads.
• Monitor abnormal temperature increases.
• Investigate unexpected PLC power interruptions.
• Inspect the RUN monitoring circuit when signals become unreliable.

Field Troubleshooting

• LED OFF: Check AC input voltage, wiring, and internal protection status.
• Low DC Output: Measure output voltage under load and inspect connected circuits.
• Repeated Power Loss: Check input voltage fluctuations and load conditions.
• RUN Signal Abnormal: Test external wiring and contact switching circuits.
• Output Overload: Disconnect unnecessary loads and verify total current demand.

The internal fuse is not user-replaceable. Follow approved Honeywell service procedures when internal protection operates.

Compatibility and Selection Considerations

The Honeywell 2MLR-AC23 supplies 5VDC power for compatible control system hardware. Check the following conditions before ordering:

• Voltage Compatibility: Connected equipment must accept a 5VDC supply.
• Current Capacity: Total load must remain within 7.5A.
• Power Budget: Connected loads must respect the 37.5W rating at 55°C.
• Input Compatibility: The cabinet supply must support 176–264VAC.
• RUN Monitoring: External circuits must support the specified contact ratings.
• Mechanical Compatibility: Verify dimensions and mounting arrangements.
• System Compatibility: Confirm the module position and configuration against Honeywell hardware documentation.

Do not select a replacement based only on matching voltage and dimensions. Check connector assignments, mounting requirements, and system power architecture.

Certifications and Compliance

The supplied specifications identify the following fuse characteristics:

• AC Fuse: 250V / 3.15A, time-lag type, UL approved.
• DC Fuse: 125V / 10A, time-lag type, UL approved.

These approvals apply to the specified fuse components. They do not independently establish complete module certification. Confirm the applicable module certification documents before project approval.

Package Contents

Standard product package:

• 1 × Honeywell 2MLR-AC23 Power Supply Module.

Mounting accessories, cables, and additional documentation depend on the confirmed order configuration. Please verify package contents before purchase.

Frequently Asked Questions (FAQ)

Q1: What is the rated output of the Honeywell 2MLR-AC23? The module provides 5VDC output with a rated current of 7.5A. Its rated output power reaches 37.5W at 55°C.

Q2: Can the 2MLR-AC23 operate with a 200VAC input? Yes. Its specified input range covers 176–264VAC. A 200VAC supply falls within this range.

Q3: What should engineers check when the output voltage LED remains OFF? First, measure the AC input voltage. Then inspect the input wiring and connected load. Check for short circuits or abnormal loading. The internal fuse is not user-replaceable. Follow the approved service procedure if protection operates.

Q4: Can the RUN contact directly drive a large external relay or contactor? Not necessarily. The RUN contact supports 24VDC and 0.5A maximum switching ratings. Check the external device's coil current and switching characteristics. Use an appropriately rated interface relay when the load exceeds these limits.

Q5: How should engineers select a replacement for the 2MLR-AC23?

Start by checking the original module model and system configuration. Then verify the following:

• AC input voltage range.
• 5VDC output requirement.
• Minimum 7.5A rated current requirement.
• Output power and loading conditions.
• RUN contact specifications.
• Mechanical dimensions and terminal assignments.

A replacement must satisfy both electrical and system-level requirements. Do not rely on output voltage alone. 

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