Honeywell FC-PSU-UNI2450U Universal Safety Manager Power Supply Unit

Technical Overview

The FC-PSU-UNI2450U is a high-performance, industrial-grade power conversion module specifically engineered for the Honeywell Safety Manager and FSC systems. This unit provides a stabilized DC output from a wide-range AC input, ensuring that critical safety logic and field instrumentation remain powered during fluctuating line conditions.

Equipped with dual overvoltage protection and a substantial hold-up time of 100 ms, the FC-PSU-UNI2450U is designed to bridge momentary power interruptions, preventing nuisance trips in Safety Instrumented Systems (SIS). Its robust thermal management allows for operation in high-temperature cabinet environments, while its low ripple and noise characteristics protect sensitive electronic components from electromagnetic interference.

Technical Specifications

• Manufacturer Honeywell

• Model Designation FC-PSU-UNI2450U

• Equipment Type Universal Power Supply Unit (PSU)

• Input Voltage Range 110 V AC to 240 V AC (Universal)

• Input Frequency 47 Hz to 63 Hz

• Inrush Current < 15 A (Cold start)

• Idle Power Consumption 13 W (No load condition)

• Nominal Output Voltage 25 V DC (Factory Default)

• Configurable Output Range 25 V DC / 28 V DC

• Peak Ripple and Noise < 40 mVpp

• System Efficiency > 87% at 230 V AC

• Hold-up Performance 100 ms at 100% Load

• Safety Protection Dual-layer overvoltage protection circuitry

• Operating Temperature -5°C to +70°C (23°F to +158°F)

• Storage Temperature -25°C to +85°C (-13°F to +185°F)

• Net Unit Weight 5.7 kg

• Total Shipping Weight 7.0 kg

Installation and Safety Application

The FC-PSU-UNI2450U is typically installed in redundant pairs within a Safety Manager rack to provide high-availability power. Its 5.7 kg mass reflects the heavy-duty filtration and heat-sinking required for 24/7 mission-critical industrial service. Engineers should ensure adequate clearance for airflow to maintain the +70°C peak operating rating without derating.

Technical FAQ

Why is the output voltage set to 25 V DC instead of a standard 24 V DC?

The FC-PSU-UNI2450U defaults to 25 V DC to compensate for potential voltage drops across long field cables and backplane distribution networks, ensuring that end-of-line devices receive a steady 24 V DC signal.

Does this unit support parallel redundancy?

Yes, this power supply is designed to work in a load-sharing or redundant configuration when integrated into the appropriate Honeywell power distribution backplane.

What happens during a short-term AC power loss?

Thanks to the 100 ms hold-up time, the module can maintain a stable DC output during brief switchovers or voltage sags, which is significantly higher than standard commercial power supplies.