Description
Core Product Summary (Brand / Model / Key Attributes)
Honeywell FC-PSU-UNI2450U is a switch-mode industrial AC-DC power supply unit for control-system cabinets and Safety Management System installations. It converts a nominal 110–240 VAC, 47–63 Hz input into a selectable 25 VDC or 28 VDC output, with a maximum output power of 1200 W.
The output is set by DIP switch: 25 VDC at 48 A or 28 VDC at 43 A, with load derating above 50 °C. The unit provides dual overvoltage protection, short-circuit protection, over-temperature protection, status LEDs, and an undervoltage alarm relay that opens below 22 VDC. Its IEC 60320 C20 AC input, Phoenix-style DC output connectors, independent AC/DC connections, and power switch support installation and replacement in industrial power-distribution arrangements. The documented operating range is -5 °C to 70 °C, and the unit weighs 5.7 kg.
Key Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | FC-PSU-UNI2450U |
| Product type | Switch-mode AC-DC power supply unit |
| Nominal AC input | 110–240 VAC |
| AC input operating range | 93–253 VAC |
| Input frequency | 47–63 Hz |
| No-load power consumption | 13 W |
| Inrush current | Less than 15 A |
| Output voltage settings | 25 VDC or 28 VDC, selected by DIP switch |
| Default output setting | 25 VDC |
| Output current | 48 A at 25 VDC; 43 A at 28 VDC, from -5 °C to +50 °C |
| Maximum output power | 1200 W |
| Temperature derating | Above 50 °C |
| Ripple and noise | Less than 40 mVpp |
| Hold-up time | 100 ms at full load |
| Efficiency | Greater than 87% at 230 VAC |
| Protection functions | Dual overvoltage protection, short-circuit protection, over-temperature protection |
| Undervoltage alarm | Relay opens when output falls below 22 VDC |
| Status indication | Green LED for normal operation; red LED for power failure, standby mode, or internal temperature above 90 °C |
| AC input connection | IEC 60320 C20 socket |
| DC output connection | Two Phoenix PCV 6/16 style connectors |
| Alarm connection | 3-pole Phoenix MC 1.5/3-G-3.81 socket |
| Operating temperature | -5 °C to +70 °C |
| Storage temperature | -25 °C to +85 °C |
| Relative humidity | 5% to 95%, non-condensing |
| Dimensions | 420.5 × 140 × 90 mm (width × height × depth) |
| Weight | 5.7 kg including cable |
| Product approvals | CE, TÜV, UL, CSA, CID2 |
| Product standard | UL 508 |
Detailed Product Overview
The Honeywell FC-PSU-UNI2450U is a 1200 W switch-mode power supply intended to provide regulated DC operating power in industrial control and Safety Management System cabinets. Its selectable output—25 VDC at 48 A or 28 VDC at 43 A—allows the supply to be matched to the voltage requirement of the connected control equipment, while the DIP-switch setting establishes the operating mode before commissioning.
The unit accepts a nominal 110–240 VAC supply across a 47–63 Hz frequency range. Its documented operating input window is 93–253 VAC, which provides margin for normal supply variation, but the available output power and thermal behavior must still be assessed against the actual cabinet load and ambient temperature. At full load, the documented hold-up time is 100 ms.
Protection and diagnostics are central to its role in a powered control system. Dual overvoltage-protection circuits limit the output voltage, while short-circuit and over-temperature protection address abnormal load or thermal conditions. A green LED indicates stable normal operation; a red LED indicates power failure, standby mode, or an internal temperature above 90 °C. The undervoltage alarm relay opens when the output falls below 22 VDC, providing a hard-wired signal that can be monitored by the control or safety system.
The FC-PSU-UNI2450U has independent AC and DC connectors and a power switch, supporting replacement without disturbing unrelated cabinet wiring. Its 420.5 × 140 × 90 mm body and 5.7 kg weight require a cabinet arrangement with adequate mechanical support and airflow. In Safety Management System applications, Honeywell documentation identifies internal air temperature, fan speed, and output-voltage range as monitored diagnostic conditions; cabinet cooling, filtration, sealing, and cable management therefore affect both availability and service life.
FC-PSU-UNI2450U
FC-PSU-UNI2450U
Engineering Selection Highlights
- The FC-PSU-UNI2450U provides 1200 W of output power, so load calculations should include both steady-state demand and inrush or transient requirements of the connected equipment.
- Its selectable 25 VDC / 28 VDC output must be set to match the voltage requirement of the downstream control system before energization.
- The 48 A rating at 25 VDC and 43 A rating at 28 VDC apply from -5 °C to +50 °C; above that temperature, output capacity is derated.
- Its 93–253 VAC input window supports nominal 110–240 VAC installations, but input distribution, protection, and conductor sizing must match the actual supply.
- The undervoltage alarm relay opens below 22 VDC, allowing the control system to detect a low-output condition through a discrete alarm input.
- Independent AC/DC connectors and a power switch support module replacement, but replacement procedures must respect the cabinet’s electrical isolation and safety requirements.
- Its forced-air cooling and documented temperature, fan, and output-voltage diagnostics make cabinet airflow, filter condition, and ambient temperature material selection criteria.
Dimensions, Mounting & Connection Notes
| Item | Verified data |
|---|---|
| Dimensions | 420.5 mm wide × 140 mm high × 90 mm deep |
| Weight | 5.7 kg, including cable |
| Mounting orientation | Vertical or horizontal; vertical installation is preferred |
| Vertical-installation clearance | 100 mm above and below the unit |
| AC input connector | IEC 60320 C20 socket |
| Recommended AC input conductor | 2.5 mm² (AWG 14) |
| DC output connectors | Two Phoenix PCV 6/16 style connectors |
| DC output conductor range | 0.75–16 mm² |
| DC conductor stripping length | 12 mm |
| Alarm connector | 3-pole Phoenix MC 1.5/3-G-3.81 socket |
| Alarm conductor range | 0.14–1.5 mm² |
| Alarm conductor stripping length | 7 mm |
| Operating temperature | -5 °C to +70 °C |
| Storage temperature | -25 °C to +85 °C |
| Relative humidity | 5% to 95%, non-condensing |
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Power-system role | Provides regulated DC operating power for industrial control and Safety Management System installations | The supply is used as a cabinet-level AC-DC power source. |
| AC supply | 110–240 VAC nominal; 93–253 VAC operating range; 47–63 Hz | Input wiring and protective devices must suit the installed supply. |
| DC output | 25 VDC or 28 VDC, selected by DIP switch | Confirm the setting before connecting downstream equipment. |
| Output load | 48 A at 25 VDC or 43 A at 28 VDC up to 50 °C | Apply the documented derating above 50 °C. |
| Alarm integration | Undervoltage alarm relay opens below 22 VDC | Connect the alarm contact to an appropriate monitoring input. |
| Cabinet cooling | Internal temperature above 90 °C is indicated; fan-speed monitoring is documented | Maintain cabinet airflow, fans, filters, and seals. |
| Fan replacement | Honeywell FC-FANWR-24R fan assembly | Honeywell documentation identifies this part for new fan assemblies. |
| Installation orientation | Vertical or horizontal installation; vertical installation is preferred | Reserve 100 mm of space above and below the unit in the documented vertical-installation arrangement. |
FAQ
What is the Honeywell FC-PSU-UNI2450U?
It is a Honeywell switch-mode AC-DC power supply unit that provides up to 1200 W of regulated DC power for industrial control and Safety Management System installations.
What output voltages does the FC-PSU-UNI2450U provide?
It provides a selectable output of 25 VDC or 28 VDC, set by DIP switch. The documented default setting is 25 VDC.
How much current can it deliver?
It delivers 48 A at 25 VDC or 43 A at 28 VDC from -5 °C to +50 °C. Output capacity is derated above 50 °C.
What AC input does it accept?
It accepts a nominal 110–240 VAC supply at 47–63 Hz, with a documented operating input range of 93–253 VAC.
How does the unit indicate a fault?
A green LED indicates normal stable operation. A red LED indicates power failure, standby mode, or an internal temperature above 90 °C.
Does it provide an alarm contact?
Yes. Its undervoltage alarm relay opens when the output voltage falls below 22 VDC.
What connectors does it use?
It uses an IEC 60320 C20 AC input socket, two Phoenix-style DC output connectors, and a 3-pole Phoenix-style alarm socket.
What are its dimensions and weight?
The unit measures 420.5 × 140 × 90 mm and weighs 5.7 kg including cable.
What installation clearances apply?
For the documented vertical installation arrangement, 100 mm of space is reserved above and below the unit; vertical installation is preferred.
Verification & Troubleshooting Notes
- Confirm the DIP-switch output setting—25 VDC or 28 VDC—before connecting or energizing downstream equipment.
- If the red LED is illuminated, distinguish between a power-failure or standby condition and an internal-temperature condition above 90 °C; each has different immediate checks.
- For an undervoltage alarm, measure the DC output at the supply terminals and determine whether the condition is a supply-output issue, excessive load, input-supply problem, or wiring/connection issue.
- If the output voltage remains outside its specified range, Honeywell documentation directs that the power supply unit be referred to Honeywell for further information on recalibration.
- Check fan operation, cabinet filters, seals, and airflow when temperature-related alarms occur; restricted airflow and dust accumulation can affect PSU temperature and service life.
- Inspect AC and DC cables for secure terminations, visible damage, and mechanical strain; cables must not obstruct cabinet interiors or become caught in doors or hinged panels.
- Maintain cabinet humidity within the documented 40% to 60% guidance and look for condensation, corrosion, and dust during maintenance.
- For replacement or isolation work, de-energize and lock out the relevant AC supply in accordance with site electrical-safety procedures; do not bypass overvoltage, short-circuit, over-temperature, or alarm functions.
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