Honeywell FC-PSU-UNI2450 Power Supply Unit

Configured for power conversion and backplane power delivery in Honeywell Safety Manager and Safety Instrumented Systems (SIS), the Honeywell FC-PSU-UNI2450 (FC-PSU-UNI2450 Power Supply Unit) provides direct physical/electrical execution. Operating on a wide input range of 110-240 VAC at 47-63 Hz, the module supplies regulated 25 VDC or 28 VDC power to system racks and control processors. The unit incorporates dual overvoltage protection and active noise filtering to maintain continuous DC output stability during grid transients, preventing processor brownouts or unwanted system trips.

Hardware Specifications

Process Control & Channel-to-Channel Isolation Characteristics

The FC-PSU-UNI2450 incorporates galvanic isolation barriers designed to shield internal safety system processors from primary AC mains transients and common-mode noise. Supporting SIL-rated safety loops, 4-20 mA HART field loop networks, and distributed DCS architectures, the power supply maintains precise output regulation with low output ripple (< 40 mVpp). Integrated cold junction compensation (CJC) support and internal decoupling networks protect downstream I/O modules from input voltage dips, ensuring predictable fail-safe behavior across critical safety instrumented functions.

Frequently Asked Questions

Q: What output voltage options are available on the FC-PSU-UNI2450, and what is the default factory setting? A: The output voltage can be set to 25 VDC or 28 VDC, with the factory default output set to 25 VDC.

Q: How long can the FC-PSU-UNI2450 sustain full output power during an AC mains interruption? A: The unit features a hold-up time of 100 ms at full load, providing ride-through capability during short-duration power sags.

Q: Is the FC-PSU-UNI2450 certified for installation in hazardous industrial environments? A: Yes, the unit holds Class I, Division 2 (CID2) certification alongside CE, TUV, UL, and CSA safety approvals.

Field Installation Guidelines

• Cabinet Chassis Mounting: Secure the power supply chassis into the designated enclosure frame using all heavy-duty mounting fasteners to accommodate the 5.7 Kg unit weight.
• Protective Bonding Connection: Connect the dedicated earth terminal directly to the enclosure protective earth (PE) copper ground bar using a low-impedance conductor.
• AC Input Line Wiring: Strip incoming 110-240 VAC supply leads to 7 mm and secure them into the heavy-duty input terminal block, confirming tight screw retention.
• Thermal Dissipation Clearance: Maintain a minimum 50 mm clearance above and below the power supply heat sink fins to prevent thermal de-rating across the -5 to +70 deg C operating range.
• Wiring Separation Rules: Route primary AC input power conductors in dedicated cabinet ducts separated by at least 200 mm from low-voltage DC power feeds and field I/O wiring.