Honeywell 2MLR-AC22 MasterLogic-200 Redundant Power Supply Module

The Honeywell 2MLR-AC22, also cataloged as the 2MLR-AC22 Redundant Power Supply Module, operates as a dedicated hardware component for dual-source 5 VDC backplane power distribution within MasterLogic-200 platforms.

Hardware Specifications

Channel Isolation and Power Bus Regulation

The 2MLR-AC22 module incorporates galvanic insulation and optical channel-to-channel isolation layers across its primary-to-secondary converter circuitry. Built-in filtering stage limits output ripple voltage to under 240 mVp-p, preserving signal integrity across 4-20 mA HART loop protocol instruments connected to adjacent I/O modules on the backplane bus. Internal sensing circuits automatically manage load sharing and immediate fault isolation in dual-power rack configurations to prevent logic bus disruption during line voltage drops.

Frequently Asked Questions

Q: What is the maximum current capacity supplied to the backplane by the 2MLR-AC22?

A: The module delivers a regulated 5 VDC output supplying up to 8.5 A of backplane logic power.

Q: Can the 2MLR-AC22 be replaced while the system remains powered by a redundant secondary module?

A: Yes, the unit supports live replacement when paired in a dual-redundant base setup, provided proper lock-out and terminal isolation safety steps are maintained.

Field Installation Guidelines

1. Ensure primary AC supply lines are disconnected and verified dead before inserting or removing power wiring from the module terminals.
2. Mount the module vertically into the designated power supply slot on the MasterLogic-200 base chassis until the locking latches click firmly into position.
3. Wire incoming 100-240 VAC power using properly rated conductors, ensuring the protective earth terminal is connected directly to the enclosure ground bar.
4. Maintain sufficient clear space above and below the module chassis to facilitate natural air cooling and prevent thermal buildup.