FC-PSU-UNI2450U V2.0 | HONEYWELL | Power Supply Unit

The HONEYWELL FC-PSU-UNI2450U V2.0, also cataloged as the FC-PSU-UNI2450U V2.0 Power Supply Unit, operates as a dedicated hardware component for AC-to-DC power conversion and regulated backplane bus energization within Honeywell Safety Manager and Fail-Safe Controller (FSC) systems. Operating on a wide-range input of 110-240 VAC at 47-63 Hz, the module provides a factory-set output of 25 VDC (configurable up to 28 VDC) with dual overvoltage protection circuits and an integrated hold-up time of 100 ms at full load. The unit weighs 5.7 kg and operates reliably across an ambient temperature range of -5 to +70 deg C.

Hardware Specifications

Channel-to-Channel Isolation & Power Conditioning

The FC-PSU-UNI2450U V2.0 integrates channel-to-channel isolation and low-noise power filtering to supply stable 25 VDC bus power to downstream analog and digital I/O modules. With output ripple and noise suppressed to less than 40 mVpp, the power supply prevents switching noise from coupling into high-accuracy 4-20 mA HART loop protocol circuits and sensitive field instrumentation. High-frequency galvanic isolation between the primary AC input stage and DC output rails protects sensitive system microprocessors from external power grid line surges and ground loop imbalances.

Frequently Asked Questions

Q: What happens to the system supply if the AC line voltage suffers a momentary interruption?

A: The internal capacitor bank provides a hold-up time of 100 ms at full load, maintaining stable 25 VDC output voltage through brief utility sags without triggering system reset or field loop fault alarms.

Q: How does the unit limit current draw during cold startup on AC mains?

A: An internal inrush current limiting circuit constrains the initial AC switch-on surge to under 15 A, preventing unwanted tripping of upstream branch circuit breakers.

Field Installation Guidelines

1. Mount the FC-PSU-UNI2450U V2.0 module vertically into the designated Safety Manager power supply slot, locking all mechanical chassis latching mechanisms firmly.
2. Terminate the primary 110-240 VAC input wiring into the screw terminal block, observing strict Phase, Neutral, and Protective Earth (PE) terminal assignments.
3. Bond the module frame ground directly to the main cabinet earth bus using a short, low-impedance conductor to ensure full efficacy of the internal EMI filter and overvoltage protection networks.
4. Maintain a minimum of 50 mm clearance above and below the module ventilation openings to allow uninhibited natural convection cooling across the internal heat sinks.