Honeywell FC-PSU-240516 24/5VDC 16A Power Supply Unit

Honeywell FC-PSU-240516 24/5VDC 16A Safety Manager Power Supply Unit

The Honeywell FC-PSU-240516 is a heavy-duty DC-to-DC power converter module engineered specifically for the Honeywell Safety Manager (SM) and Fail-Safe Controller (FSC) architectures. Designed to operate continuously within safety-instrumented systems (SIS) certified up to IEC 61508 SIL 3, this module takes a nominal 24 VDC bus input and delivers a regulated, low-noise 5.0 VDC output at currents up to 16.0 A.

Within Safety Manager backplane racks and controller chassis, the FC-PSU-240516 powers mission-critical internal digital processing electronics, Quad Processor Units (QPP), communication interfaces (USI), and backplane bus termination logic. Built with galvanic isolation, internal overvoltage clamping, overcurrent foldback protection, and thermal throttling, the module delivers consistent DC power within harsh industrial and marine control environments without suffering from rail droop or ripple-induced logic resets.

Model Details

• Manufacturer: Honeywell Process Solutions
• Part Number (MPN): FC-PSU-240516
• Model Revision: V1.0 / Revision Series Compatible
• System Family: Safety Manager / FSC / Experion® PKS Safety System
• Functional Description: 24V DC to 5V DC 16 Amp Regulated Power Supply Unit

Key Features

1. Regulated High-Current 5V Rail: Converts raw 24 VDC plant or battery power to a ripple-controlled 5.0 VDC @ 16 A output, supplying low-voltage backplane logic across Safety Manager processor racks.
2. SIL 3 Architecture Compliance: Engineered and qualified for use in safety-critical Emergency Shutdown (ESD) and Fire & Gas (F&G) loops meeting IEC 61508/61511 functional safety demands.
3. Active Protection Circuitry: Integrated current limiting, output overvoltage latching, transient suppression (surge/burst), and automatic thermal shutdown protect interconnected processor modules.
4. Industrial & Marine Grade Robustness: Conformal-coated component board defends against corrosive industrial atmospheres (ISA-71.04 Class G3), salt spray, high ambient humidity, and vibration up to 15 G.
5. Seamless Backplane Insertion: Eurocard-style form factor with heavy-duty pin connections ensures low contact resistance, vibration-resistant seating, and integrated power status monitoring via front LED indicators.

Compatible Equipment Models

• Safety Control Units: Honeywell Safety Manager Controller Chassis (CP Chassis)
• Processor Modules: Quad Processor Pack (QPP) series (e.g., FC-QPP-0001, FC-QPP-0002)
• Interface & Bus Modules: Universal Safety Interface (FC-USI-0001, FC-USI-0002)
• Subracks & Carriers: Safety Manager Central Controller Racks, Field Termination Assembly (FTA) backplanes, and redundant 2oo4D architecture chassis
• Integration Platform: Honeywell Experion® PKS integration via Safety Manager gateway

Part Number Cross-References

• Honeywell Item Code: FC-PSU-240516
• Legacy Sub-Assembly ID: PSU-240516
• Revision Markings: FC-PSU-240516 V1.0 / Rev. A, B, C, D
• Harmonized System (HS) Code: 8537.10.1190 / 8504.40.95

Applications

• Offshore Oil & Gas Platforms: Powering Emergency Shutdown (ESD) logic and platform Fire & Gas (F&G) detection processors under continuous marine atmospheric exposure.
• FPSO & Commercial Marine Vessels: Safeguarding integrated propulsion control, ballast control safety interlocking, and cargo handling emergency trip systems.
• Petrochemical & Refineries: Providing continuous 5V DC control logic power in safety instrumented systems for hydrocarbon cracking and high-pressure separators.
• Turbomachinery & Compressor Stations: High-reliability overspeed and surge shutdown safety controls demanding zero power fluctuations under extreme mechanical vibration.
• Burner Management Systems (BMS): Powering logic solving processors complying with NFPA 85 and NFPA 86 standards.

Frequently Asked Questions

Can the Honeywell FC-PSU-240516 replace older FSC power supply modules?

Yes. The FC-PSU-240516 is backwards-compatible with various iterations of legacy Honeywell Fail-Safe Controller (FSC) systems as well as current Safety Manager racks. Review your chassis backplane pin configuration and mounting depth prior to swapping legacy chassis modules.

What are the symptoms of an aging or failing FC-PSU-240516 module?

The primary indicators are intermittent system error codes (such as QPP communication watchdogs or bus sync dropouts), an illuminated red Fault LED on the module front, or output DC ripple rising above 100 mV, which causes erratic processing logic without a complete DC loss.

Can I hot-swap this power supply while the safety system is running?

In dual-redundant power configurations where a secondary PSU is actively sharing the backplane logic load, hot-swapping can be performed. However, verify that the remaining PSU is carrying the current safely and that strict plant ESD safety procedures are followed during extraction and insertion. Simplex system configurations require a planned process shutdown.

Why is 5V DC regulation critical for the Safety Manager QPP?

The Quad Processor Pack (QPP) and high-speed communication logic operate on 5V TTL and CMOS thresholds. Even microsecond voltage drops below 4.75 VDC will trigger safety processor resets and drop out fail-safe digital outputs, resulting in uncommanded plant shutdowns.