WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Part number | FC-PSU-UNI2450U |
| Hardware revision | V2 / V2.1 (component-update revision with no functional change) |
| Product family | Honeywell Safety Manager / FSC / Safety Instrumented Systems |
| Product type | Universal AC–DC power supply unit |
| Primary function | Converts universal AC mains to regulated 24 VDC for safety controllers, I/O modules, and field devices |
| Input voltage | 100–240 VAC (operating range approximately 93–253 VAC) |
| Input frequency | 47–63 Hz |
| Output voltage | Regulated 24 VDC (selectable 25 VDC or 28 VDC via DIP switch in some versions; default 25 VDC) |
| Output current | Up to 50 A continuous (approximately 48 A at 25 VDC, 43 A at 28 VDC, depending on temperature and version) |
| Maximum output power | Approximately 1200 W |
| Efficiency | Greater than 87% at 230 VAC; approximately 92% in some configurations |
| Power factor | Greater than 0.9 |
| Ripple and noise | Less than 40 mV peak-to-peak |
| Hold-up time | Approximately 100 ms at full load |
| Inrush current | Less than 15 A |
| Protection features | Dual overvoltage protection, overcurrent protection, short-circuit protection, over-temperature protection, under-voltage alarm (V2.1) |
| Redundancy | Supports 1+1 or N+1 redundant configurations for high availability |
| Cooling | Forced air cooling via built-in fan |
| Operating temperature | −5 to +70 °C (some sources specify −20 to +50 °C for continuous full-load operation) |
| Storage temperature | −25 to +85 °C |
| Relative humidity | 5–95%, non-condensing |
| Certifications | CE, TUV, UL, CSA, UL508, IEC 61508-compliant for safety system applications |
| Physical dimensions | Approximately 420.5 × 140 × 90 mm (L × W × H); shipping weight approximately 5.7–7 kg depending on configuration |
| Connectors | IEC 60320 C20 AC input socket; Phoenix PCV6-16/2-G1F-10,16 DC output connectors |
| Replacement requirement | Match FC-PSU-UNI2450U, verify V2 vs V2.1, output voltage setting, redundancy mode, mounting, and system compatibility |
Honeywell documentation and supplier data identify FC-PSU-UNI2450U as a high-capacity universal power supply for Safety Manager and FSC systems. It converts 100–240 VAC to regulated 24 VDC with up to 50 A output, supports redundant configurations, and includes comprehensive protection features. The V2.1 revision adds undervoltage protection and component updates while retaining the same functional characteristics.
Product Introduction
The Honeywell FC-PSU-UNI2450U V2 is a universal AC–DC power supply module designed for Honeywell Safety Manager, FSC, and safety-instrumented system architectures. It accepts 100–240 VAC input and delivers a regulated 24 VDC output capable of powering critical safety controllers, I/O modules, and field devices.
The module supports up to 50 A continuous output (approximately 1200 W) and can be configured in 1+1 or N+1 redundant arrangements for high availability. It includes dual overvoltage protection, overcurrent and short-circuit protection, over-temperature shutdown, and fan-status monitoring. The V2.1 revision adds undervoltage alarm functionality while maintaining the same electrical specifications.
FC-PSU-UNI2450U V2
FC-PSU-UNI2450U V2
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No 24 VDC output, fans not running | Missing AC input, blown AC fuse, failed PSU, loose AC connector, upstream breaker open | ✅ High | Verify AC input voltage at the IEC C20 inlet. Check upstream breaker and fuse. Inspect AC connector retention. Measure 24 VDC at the output terminals. | Restore AC input and correct connector issues first. Replace the PSU only after confirming input power and connector integrity. |
| 24 VDC output low or unstable | Overloaded output, failing PSU, poor output connection, high ambient temperature, fan failure | ⚠️ Medium | Measure output voltage and current under load. Check output connector tightness and cable condition. Monitor cabinet temperature and fan operation. | Reduce load or improve cooling. Replace the PSU if output remains out of specification with a known-good load. |
| One PSU in redundant pair shows fault | Failed PSU, configuration mismatch, load-sharing issue, wiring fault, backfeed from other PSU | ⚠️ Medium | Check both PSUs’ output voltages and alarm status. Verify redundancy wiring and diode-OR arrangement. Inspect output connectors and cables. | Isolate the faulty PSU and verify the remaining unit can sustain the load. Replace the failed unit after confirming wiring and configuration. |
| Overvoltage alarm or shutdown | Output overvoltage, failed regulation circuit, incorrect DIP-switch setting, external voltage backfeed | ⚠️ Medium | Measure output voltage and compare with the configured setting. Check DIP-switch position for 25 VDC vs 28 VDC. Inspect for external voltage sources backfeeding into the 24 VDC rail. | Correct the overvoltage source before replacing the PSU. Verify DIP-switch settings match system requirements. |
| Fan noise or fan-fault alarm | Failing fan, dust buildup, bearing wear, high ambient temperature, fan obstruction | ⚠️ Medium | Inspect fan operation visually and audibly. Check for dust accumulation and airflow obstruction. Monitor cabinet temperature. | Clean the fan and improve ventilation. Replace the PSU if fan failure persists or causes overheating. |
| PSU runs hot or thermal shutdown | Overload, poor ventilation, high ambient temperature, dust accumulation, failed thermal sensor | ⚠️ Medium | Check output load current and compare with ratings. Inspect cabinet airflow and temperature. Clean dust from PSU and surrounding area. | Reduce load or improve cooling. Persistent thermal issues can shorten PSU life. |
| New PSU does not restore 24 VDC output | Wrong model, incompatible configuration, incorrect wiring, output short circuit, configuration issue | ✅ High | Verify the replacement is FC-PSU-UNI2450U. Check wiring against the approved diagram. Inspect output for short circuits. | Restore correct wiring and configuration. Do not assume a new module will automatically fix a wiring or load fault. |
| Intermittent output or alarms | Loose AC or DC connections, marginal AC input, aging capacitors, vibration, thermal cycling | ⚠️ Medium | Inspect AC and DC connector tightness. Monitor AC input voltage stability. Check for vibration or thermal cycling effects. | Improve connections and environmental conditions. Replace aging PSUs proactively in critical systems. |
Field note: The most common FC-PSU-UNI2450U issue is not the power supply itself but the AC input, output load, or redundancy wiring. Before replacing it, verify AC input voltage, output current, connector seating, and redundancy configuration. I have seen a new PSU fail within hours because an output short circuit was never cleared.
If you need technical support, provide photos of the FC- label, AC/DC wiring, measured voltages and currents, redundancy configuration, fan status, and any related alarm text.
Frequently Asked Questions
What does the Honeywell FC- do?
The FC- is a universal AC–DC power supply for Honeywell Safety Manager, FSC, and safety-instrumented systems. It converts 100–240 VAC input to regulated 24 VDC output for controllers, I/O modules, and field devices.
What input voltage does FC- require?
The module accepts 100–240 VAC nominal, with an operating range of approximately 93–253 VAC at 47–63 Hz. This wide input range supports various international power grids without hardware changes.
What output does FC- provide?
It provides regulated 24 VDC output with up to 50 A continuous current (approximately 1200 W). Some versions allow selection between 25 VDC and 28 VDC via DIP switch, with default setting at 25 VDC. The output includes dual overvoltage protection and comprehensive fault monitoring.
What is the difference between V2 and V2.1?
V2.1 is a component-update revision with no functional change compared to V2. The V2.1 revision adds undervoltage alarm functionality and updated internal components while retaining the same electrical specifications and performance characteristics.
Can FC- be used in redundant configurations?
Yes. The module supports 1+1 or N+1 redundant configurations for high availability. Multiple PSUs can be connected in parallel with appropriate diode-OR or redundancy modules to ensure continuous operation even if one PSU fails.
What protection features does FC- include?
The module includes dual overvoltage protection, overcurrent protection, short-circuit protection, over-temperature protection, and under-voltage alarm (V2.1). It also provides fan-status monitoring and ripple/noise below 40 mV peak-to-peak for stable operation.
Can I hot-swap FC-?
Do not hot-swap it without following the approved procedure. In redundant configurations, one PSU can often be replaced while the other continues to supply the load, but this requires proper isolation, load verification, and operational approval. In non-redundant configurations, removal will interrupt 24 VDC power to the entire system.
Why is my 24 VDC output low or unstable?
Check these items in order:
- Verify AC input voltage and frequency.
- Check output load current and compare with ratings.
- Inspect output connector tightness and cable condition.
- Monitor cabinet temperature and fan operation.
- Review PSU diagnostics and alarm status.
If AC input is correct but 24 VDC output remains out of specification with a known-good load, the power supply becomes a credible suspect.
Is FC- compatible with other Honeywell DCS platforms?
The module is primarily designed for Honeywell Safety Manager, FSC, and safety-instrumented systems. While it provides standard 24 VDC output, compatibility with other Honeywell DCS or PLC platforms depends on voltage requirements, current capacity, mounting, and redundancy architecture. Confirm the system requirements and approved hardware list before ordering.
Is this FC- New Surplus or Refurbished?
The condition must be stated explicitly. New Original / New Surplus means unused inventory with verified labels, clean connectors, and documented storage inspection. Refurbished (tested) means a previously used module that has been inspected and functionally checked.
For a refurbished FC-, request actual-unit photos, label verification, AC input and 24 VDC output test under load, redundancy configuration test, fan operation check, connector inspection, and a written test report. Test videos and photos should be available upon request.
What should I verify before ordering FC-?
- Exact module label: FC- and revision (V2 or V2.1)
- Input voltage: 100–240 VAC compatibility
- Output voltage: 24 VDC, 25 VDC, or 28 VDC setting
- Output current: total system load and future expansion
- Redundancy configuration: 1+1 or N+1 arrangement
- Mounting: rack, panel, or DIN rail compatibility
- Existing diagnostics, alarms, and event logs
- Cabinet temperature and ventilation condition
- Required condition: New Original/New Surplus or Refurbished (tested)
Keep these checks in mind and you will avoid most FC- replacement rework.
