Honeywell 2MLR-AC23 Redundant Power Supply Module AC 220V 8.5A

Product Overview

The Honeywell 2MLR-AC23 is a high-capacity redundant power supply module for the MasterLogic-200R (ML200R) PLC system. It accepts AC 220V input and delivers regulated DC 5V at 8.5A to power redundant CPU racks, I/O modules, and communication interfaces. With active-active load sharing and hot-swap capability, it ensures continuous power delivery for the most demanding critical control applications in power generation, oil & gas, and chemical processing.

Key Specifications

• Product Type: Redundant Power Supply Module (High Capacity)
• Series: MasterLogic-200R (Redundant)
• Input Voltage: AC 220V (200–240V range)
• Output Voltage: DC 5V (regulated ±2%)
• Output Current: 8.5A
• Redundancy Type: Active-Active (parallel sharing)
• Switchover Time: Zero (seamless failover)
• Efficiency: >85%
• Protection: Overvoltage, overcurrent, short-circuit, thermal shutdown
• Run Contact: SPDT relay contact (250V AC / 2A) for status indication
• Hot-Swappable: Yes
• Dimensions (W x H x D): 122 mm x 35 mm x 100 mm
• Weight: Approx. 0.45 kg
• Operating Temperature: 0°C to +55°C
• Certifications: CE, RoHS

Features & Benefits

• 8.5A high capacity — 55% more power than the 5.5A AC22, supporting fully loaded 12-slot redundant racks with high-density I/O and multiple communication modules
• 220V AC input for international sites — designed for European, Asian, and Australian mains voltage standards, eliminating step-down transformers
• Active-active redundancy — dual 2MLR-AC23 modules share the load; failure of one supply results in instantaneous, bumpless transfer to the surviving unit
• Hot-swap maintenance — defective power supplies can be extracted and replaced while the process continues to run, maximizing system availability
• Built-in run contact — dry contact output interfaces with BMS, SCADA, or annunciator panels for immediate power fault notification

Typical Applications

• Large steam turbine control and protection systems
• Petrochemical refinery safety instrumented systems (SIS)
• Nuclear power plant auxiliary control
• Offshore platform topside process control
• Pharmaceutical multi-reactor batch control
• Any fully loaded 12-slot ML200R rack requiring maximum power margin

Installation Guide

1. Confirm mains voltage — verify your site provides AC 220V (200–240V). For AC 110V sites, use 2MLR-AC13 (8.5A) instead.
2. Install in redundant power slots — mount two 2MLR-AC23 modules in the dedicated power supply slots of the ML200R main base (2MLR-M02P or 2MLR-M06P).
3. Wire independent feeds — connect each power supply to a separate AC circuit breaker and distribution panel to achieve true power source diversity.
4. Connect earth ground — bond the PE terminal to the cabinet earth bus with 2.5 mm² wire.
5. Wire run contacts — connect the SPDT relay contacts to your alarm system or PLC diagnostic input for remote monitoring.
6. Test failover — energize both supplies, confirm load sharing, then remove one supply and verify the second maintains 5V output without CPU fault.

FAQ

Q: What is the difference between 2MLR-AC23 and 2MLR-AC22?
A: The 2MLR-AC23 provides 8.5A output. The 2MLR-AC22 provides 5.5A output. Both accept AC 220V input. Choose AC23 for fully loaded 12-slot racks; choose AC22 for 2-slot and 6-slot racks.

Q: Can I mix AC22 and AC23 in the same rack?
A: No. Honeywell recommends using identical power supply models in redundant pairs to ensure equal load sharing and prevent circulating currents.

Q: Is this compatible with non-redundant ML200 bases?
A: No. The 2MLR-AC23 is mechanically and electrically designed for ML200R redundant bases only (2MLR-M02P, 2MLR-M06P).

Q: What is the efficiency and heat dissipation?
A: At >85% efficiency, a fully loaded 2MLR-AC23 dissipates approximately 25–30W as heat. Ensure 50 mm clearance above and below the module for convective cooling.

Selection Tips

• Select 2MLR-AC23 for AC 220V sites with fully loaded 12-slot redundant racks.
• For smaller racks (2-slot or 6-slot), the 2MLR-AC22 (5.5A) is more cost-effective.
• For AC 110V sites, choose 2MLR-AC13 (8.5A) or 2MLR-AC12 (5.5A).
• Always install two identical power supplies per rack — never run redundant systems with a single supply.
• Calculate your total 5V bus load (CPU + I/O + communication modules) before ordering; a 12-slot rack with high-density I/O typically requires 8.5A.