Description

The Honeywell FS-PSU-UNI2450U is a high-capacity switch-mode power supply module designed for use within Honeywell Safety Manager architecture and industrial control systems. Operating as a core power conversion element, it converts single-phase AC or DC mains voltage into a regulated 24–28 V DC output to supply field devices, Control Processor chassis, and I/O modules in critical safety instrumented systems (SIS).

Engineered to deliver up to 1200 W output power, the FS-PSU-UNI2450U features active Power Factor Correction (PFC), short-circuit and overvoltage protection, and a built-in alarm relay contact for continuous status monitoring. The module supports flexible system topologies and can be deployed in non-redundant (N), redundant (N+1), or fully redundant (Nx2) power supply configurations to ensure maximum operational uptime.

The front panel includes a mechanical power switch, a four-position output voltage selector switch, status LEDs, and test points for output voltage verification. Designed for cabinet or carrier mounting in industrial automation environments, the unit incorporates active fan cooling to maintain stable continuous operation across demanding load profiles.

Features

• High-Power Capacity: Delivers continuous output power up to 1200 W with a maximum current rating of 50 A at 24 V DC.
• Selectable Output Voltage: Four-position rotary selector switch provides adjustable output settings for 25.0 V, 26.0 V, 27.0 V, and 28.0 V DC.
• Wide Input Voltage Range: Accepts 100–240 V AC nominal (85–265 V AC limits) and 110–250 V DC input sources.
• Active Power Factor Correction: Built-in active PFC ensures high energy efficiency with a power factor exceeding 0.95 at 230 V AC full load.
• Integrated Alarm Monitoring: Dry contact alarm relay triggers on low output voltage (<22 V DC) or overtemperature conditions.
• Redundancy Support: Compatible with N, N+1, and Nx2 redundant power supply and feeder topologies in Safety Manager systems.
• Protective Features: Includes electronic short-circuit protection, overvoltage shutdown, and thermal protection with auto-recovery.

Applications

• Main 24 V DC system power supply for Honeywell Safety Manager cabinets.
• Power source for Control Processor chassis, I/O chassis, and Field Termination Assemblies (FTAs).
• Power distribution in Safety Instrumented Systems (SIS), Emergency Shutdown (ESD) systems, and Fire and Gas (F&G) protection architecture.
• Redundant field instrument and output loop power supply.

Technical Specifications

General

Input Electrical Ratings

Output Electrical Ratings

Protection and Diagnostics

Environmental and Cooling

Connections / Interfaces

Installation Guidelines

1. Safety Pre-Installation Verification: Confirm that incoming mains power supply matches the rated input specifications (85–265 V AC or 110–250 V DC) and that the main breaker is locked out before installation.
2. Mounting: Securely mount the module within the designated Safety Manager cabinet or power rack. Ensure unobstructed airflow at both top and bottom ventilation openings to maintain optimal fan cooling.
3. Protective Earth Grounding: Wire the Protective Earth (PE) terminal directly to the cabinet ground bus prior to making any power connections.
4. Input and Output Wiring: Connect incoming AC or DC supply cables to the input terminal block using recommended wire gauges capable of handling up to 15 A continuous current. Connect the DC output terminals to the main power rail or feeder unit using high-current conductors.
5. Voltage Selection: Adjust the 4-position rotary selector switch to the desired system voltage level (25 V, 26 V, 27 V, or 28 V DC) before energizing the system.
6. Alarm Contact Integration: Wire the potential-free alarm contact to the system monitoring channel or watchdog board to capture fault signals such as output undervoltage or overtemperature.
7. Commissioning Inspection: Measure output voltage across front-panel test sockets using a calibrated digital multimeter before applying power to downstream processors or I/O modules.