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Honeywell FC-PSUNI-2424 Universal Power Supply Unit

Configured for isolated 24 VDC power conversion in Honeywell Safety Manager platforms, the Honeywell FC-PSUNI-2424 (FC-PSUNI-2424 Universal Power Supply Unit) provides direct electrical power conditioning for redundant safety system configurations.

Hardware Specifications

Parameter	Specification
Model	FC-PSUNI-2424
Brand	Honeywell
Origin	USA
Operating Temp	-20 deg C to +60 deg C
Power Consumption	Output power: 576 W, rated output current: 24 A
Product Type	Universal Power Supply Unit, 24 VDC output
System Compatibility	Honeywell Safety Manager / Safety Manager SC
Input Voltage	115 VAC / 230 VAC nominal, approximately 90 - 265 VAC range
Input Frequency	47 - 63 Hz
Output Voltage	24 VDC, adjustable approximately 22.0 - 28.0 VDC
Output Current	24 A continuous
Efficiency	> 90% at nominal load
Ripple and Noise	< 50 mVss peak-to-peak
Redundancy Configuration	Supports 1+1 and N+1 redundant power configurations
Protection Functions	Overvoltage, overload, short circuit, and overtemperature protection
Diagnostic Interface	LED indicators and dry contact relay outputs
Cooling Method	Convection cooling or cabinet fan-assisted cooling depending on installation

Channel Isolation and Safety Power Architecture

The Honeywell FC-PSUNI-2424 integrates isolated DC output conversion for Safety Manager power distribution structures. The unit supports diode-coupled or active ORing redundant arrangements, allowing multiple power modules to operate in parallel.

Additionally, the power supply provides diagnostic contacts for system monitoring. The dry relay outputs transmit power status information to the safety controller or DCS interface. The protection circuit monitors output voltage, current loading, and thermal conditions to maintain controlled shutdown and restart behavior.

The FC-PSUNI-2424 operates as a power subsystem component rather than a signal acquisition module; therefore, it does not provide 4-20 mA HART or FOUNDATION Fieldbus communication channels. Its function is limited to regulated DC power delivery and fault indication within the Honeywell safety architecture.

Frequently Asked Questions

Q: Does the FC-PSUNI-2424 support redundant power configurations?
A: Yes. The unit supports 1+1 and N+1 redundant arrangements through integrated diode coupling or active ORing methods. A parallel power module can assume the load when another unit fails.

Q: What diagnostic signals are available from the FC-PSUNI-2424?
A: The unit provides LED status indication and volt-free relay contacts for remote monitoring of power conditions, including input failure, output overvoltage, overload, and thermal faults.

Q: Can the FC-PSUNI-2424 be installed outside Honeywell Safety Manager systems?
A: The unit is designed for Honeywell Safety Manager and Safety Manager SC power architectures. Installation in other systems requires electrical compatibility verification for voltage range, current capacity, and mechanical integration.

Field Installation Guidelines

• Install the FC-PSUNI-2424 inside a suitable control cabinet with adequate ventilation and environmental protection.
• Verify AC input wiring polarity, protective earth connection, and supply voltage range before energizing the module.
• Use dedicated power wiring paths and maintain separation between AC input cables and low-level signal wiring.
• Connect the DC output according to the cabinet power distribution design and confirm correct polarity before operation.
• When implementing redundant configurations, verify the ORing or diode coupling arrangement before applying load.
• Connect diagnostic relay contacts to the safety controller or monitoring system using shielded control wiring where required by site standards.
• Maintain proper grounding practices to reduce electrical noise coupling into adjacent instrumentation circuits.

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