Honeywell FC-PSU-UNI2450U V2.1 Power Supply Unit

The Honeywell FC-PSU-UNI2450U V2.1, also cataloged as the FC-PSU-UNI2450U Power Supply Unit, operates as a dedicated hardware component for 24VDC conversion and power distribution within Honeywell Safety Manager and industrial control systems.

Hardware Specifications

Channel-to-Channel Isolation & Cold Junction Compensation

The internal voltage regulation topology incorporates isolation barriers to eliminate ground loops and line-side transient propagation to system backplanes. With ripple and noise suppressed below 40 mVpp, the unit stabilizes field instrument power loops, preventing power-supply-induced noise from degrading 4-20 mA HART loop protocol signaling. This level of DC rail isolation prevents thermal and electrical offset drift across sensitive cold junction compensation (CJC) circuits in connected analog input hardware.

Frequently Asked Questions

Q: What output voltage configurations does the FC-PSU-UNI2450U V2.1 support?

A: The factory default setting is 25 VDC, with support for 25 VDC or 28 VDC output levels equipped with dual overvoltage protection circuits.

Q: How long can the power supply maintain output voltage during a full line voltage drop?

A: The integrated hold-up circuitry maintains regulated output power for a minimum of 100 ms at full load during input power interruptions.

Q: What is the maximum inrush current upon applying AC mains voltage?

A: The input stage features current-limiting circuitry that restricts peak inrush current to under 15 A.

Field Installation Guidelines

1. Mount the unit securely inside the enclosure chassis using standard mounting hardware to maintain solid physical earthing.
2. Ensure input AC mains power is de-energized prior to connecting conductors to the primary AC terminal block.
3. Observe correct wiring polarity when connecting the 25 VDC output bus lines to downstream backplane rails.
4. Maintain dedicated physical separation between AC input power lines and low-voltage DC signal cables inside cabinet trunking.
5. Connect the main chassis protective earth (PE) stud directly to the central cabinet grounding bus bar.