Emerson P188.R2 Power Supply Module

The Emerson P188.R2 is a field-proven AC/DC power supply designed specifically for DeltaV distributed control systems. It provides reliable 24 VDC power to controllers, I/O modules, and field devices, ensuring stable operation even in demanding industrial environments.

Input and Output Specifications

This module accepts a universal input of 100–240 VAC, 50/60 Hz, and delivers a regulated output of 24 VDC at up to 10 A continuous current. The output is protected against overcurrent, overvoltage, and short circuits, with automatic recovery upon fault clearance. The P188.R2 features a green LED for power OK indication and an alarm relay contact that signals loss of output to the control system.

Redundancy and Reliability

For critical applications, two P188.R2 units can be configured in 1+1 redundancy using external diode OR-ing modules. This ensures uninterrupted power to the load even if one supply fails. The module has a mean time between failures (MTBF) exceeding 500,000 hours and is designed for continuous duty. It includes input transient protection and meets SEMI F47 voltage sag immunity standards.

Mechanical and Environmental

The P188.R2 mounts on a standard DeltaV power supply carrier and occupies a single slot width. Its extruded aluminum housing aids heat dissipation, allowing operation from -40°C to +70°C without derating. The unit is rated IP20 for indoor use and is compliant with RoHS and WEEE directives.

Applications

It is widely used to power DeltaV controllers like the VE3008, I/O banks, and field instruments such as transmitters and positioners. In petrochemical facilities, the P188.R2 ensures that safety shutdown systems remain energized. Its robust construction makes it suitable for offshore platforms and remote pipeline stations.

Certifications

The power supply carries UL 508, CSA C22.2 No. 14, and CE markings. It is also certified for Class I, Division 2 hazardous locations, making it suitable for installation in areas with flammable gases or vapors.

Conclusion

The Emerson P188.R2 power supply combines high efficiency, ruggedness, and redundancy capabilities to provide clean and reliable DC power for DeltaV automation systems, forming the backbone of any secure control architecture.