Allen-Bradley 1775-P2 PLC-3 Power Supply Module

The 1775-P2 is a single-slot multi-output power supply module manufactured by Allen-Bradley for the PLC-3 control system architecture. Designed to convert single-phase AC line voltage into regulated DC system power, it delivers up to 28 A of total maximum output current across three dedicated DC outputs. This chassis-mounted power supply unit provides line-to-DC galvanic isolation alongside internal protection circuitry to ensure stable system operation across industrial control enclosures.

Power Conversion and Protection Features

The module operates on a wide input range of 115 to 230 VAC single-phase power at 47 to 63 Hz, adapting easily to standard industrial supply grids. Primary input protection is provided by an internal fuse to safeguard internal electronics against line surges. On the secondary side, each of the three regulated DC output channels incorporates built-in short-circuit and overcurrent protection, preventing downstream component damage in the event of field wiring faults.

Chassis Mounting and Power Distribution

Occupying a single slot within a compatible PLC-3 system rack, the unit distributes regulated DC power directly across the backplane structure. Weighing approximately 21.75 lbs (9.87 kg), the module relies on robust mechanical latching to ensure reliable electrical contact with backplane bus connections while simplifying replacement during scheduled maintenance.

Frequently Asked Questions

Q: What AC input voltages are compatible with the 1775-P2 power supply? A: The module accepts single-phase AC input voltages ranging from 115 to 230 VAC at frequencies between 47 and 63 Hz.

Q: How many DC outputs does the 1775-P2 supply, and what is its maximum total output current rating? A: It provides 3 regulated DC outputs with a combined maximum current capability of 28 A.

Q: What protective features are built into the 1775-P2 power supply? A: The unit features an internal fuse for input line protection, line-to-DC galvanic isolation, and active overcurrent and short-circuit protection on its DC output channels.