Haydon HAY-PSUEN54-2AL EN54-4 Power Supply | 24V DC, 2A, Large Enclosure
£119.86 (inc VAT: £143.83)
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Key features
- Amber LED gives detailed engineer fault codes
- Houses two 18Ah batteries for extended standby
- Separate GEN and EPS fault reporting outputs
Downloads
Summary
The HAY-PSUEN54-2AL from Haydon is a 27.6V DC uninterruptible power supply (UPS) built for compliant fire alarm systems that need extra power for auxiliary devices, and it stands out with an amber diagnostic LED that gives you a detailed, multi-stage fault code system engineers can read straight from the front panel.
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That level of diagnostic detail saves you time on site: instead of guessing whether a fault is a blown fuse, a battery connection issue or a faulty temperature sensor, you can check the flash pattern against the fault finding guide and go straight to the fix. For contractors managing several sites, that means fewer return visits and faster sign-off on service calls.
The unit pairs a green mains LED and yellow fault LED with the amber diagnostic LED, each flash pattern tied to a specific issue from overload through to battery temperature sensor faults. Separate GEN and EPS volt-free fault outputs let you report general system faults and loss of mains independently back to your fire panel or building management system (BMS), while the large metal enclosure houses two 18Ah batteries for extended backup runtime.
Features
- Amber diagnostic LED - gives up to five distinct flash codes for mains, battery and charging faults so you know what to check before opening the enclosure
- Two 18Ah battery capacity - large enclosure houses two 18Ah batteries for extended standby runtime on bigger auxiliary loads
- GEN and EPS fault outputs - separate volt-free relay outputs report general system faults and mains loss independently to your fire panel
- Deep discharge protection - disconnects batteries automatically below 21V DC to prevent damage during extended mains outages
- Temperature-compensated charging - supplied sensor adjusts charge voltage by -30mV/°C to protect battery life across 0-50°C
- Overload protection circuit - safeguards the PCB from damage during short circuit or overload conditions on the output
- Battery monitoring - continuously checks for low voltage, incorrect connection and short circuit on connected batteries
- EN54-4 compliant - certified to EN54-4:1997 +A1 +A2 for use with compliant fire detection and alarm systems
Specifications
| Rated Voltage And Frequency | 110-240V AC, 47-63Hz |
|---|---|
| Input Current | 0.5A |
| Mains Fuse Rating | F3A |
| Output Voltage (Mains Power) | 22.0-27.6V DC |
| Output Voltage (Battery Standby) | 20.0-26.0V DC |
| Ripple | Less than 180mV |
| Output Fuse | F2A |
| Battery Fuse | F2A |
| Imax With Charging | 2A |
| Imax Without Charging | 2.8A |
| Battery Capacity | 2 x 18Ah |
| Maximum Battery Internal Resistance | 5Ω |
| Minimum Current | 0.1A |
| Battery Charging | Two stage: constant current bulk charge to 80% within 24 hours, float charge to 100% within 48 hours |
| Constant Current Charge | 0.8A |
| Temperature Compensation | -30mV/°C (0-50°C) |
| Low Battery Voltage Trigger | 23V |
| Deep Discharge Protection Cut Out | 21V |
| GEN Fault Output | Normally closed; 0.50A at 60V DC, 0.9Ω solid state relay, volt free; opens if mains failed and battery below 23V or fault condition present |
| EPS Fault Output | Normally closed; 0.50A at 60V DC, 0.9Ω solid state relay, volt free; opens if loss of mains for more than 10 seconds |
| Operating Temperature | -20°C to +45°C, 20-90% RH non-condensing |
| Storage Temperature | -25°C to +85°C, 10-90% RH non-condensing |
| Enclosure Material | 1.2mm steel, white powder coated |
| Enclosure Dimensions (H x W x D) | 400 x 420 x 80mm |
| Weight Excluding Batteries | 5kg |
| Weight With Batteries Fitted | Approximately 18.5kg |
| Approvals | EN54-4:1997 +A1 +A2, EMC 2014/30/EU, LVD 2014/35/EU, RoHS2.0 2011/65/EU, Environmental Class II |
FAQ
This unit is designed for two 18Ah sealed lead-acid (SLA) batteries, connected in series using the supplied short bridging wire. Connect the bridging wire between the positive terminal of one battery and the negative of the other, then fit the supplied brackets to secure both batteries in place. With both 18Ah batteries installed, the HAY-PSUEN54-2AL weighs approximately 18.5kg. Make sure the mounting surface and wall fixings you use are rated to support this weight before installing the unit. Haydon recommends a minimum 0.75mm² cable, with earth, for the mains input, and a minimum 0.5mm² cable for the 2A output circuit. All cabling should also meet the applicable fire alarm wiring regulations for your installation. No. Both the GEN and EPS fault outputs are volt-free solid state relay contacts rated at 0.50A at 60V DC, so any circuit you connect to them must stay below 60V DC. GEN opens if mains has failed and battery voltage drops below 23V or another fault condition is present, while EPS opens after more than 10 seconds of mains loss. Start with the yellow fault LED and green mains LED combination from the end user fault finding guide, then check the amber diagnostic LED flash count against the service engineer fault finding guide for a more specific cause, such as a battery fault, charging fault or temperature sensor fault. This should point you to the right component to check or replace before further testing. Yes, the supplied temperature sensor should be connected so the PSU can apply its -30mV/°C charging compensation across 0-50°C. If it is not connected, the amber diagnostic LED will flash a code indicating a temperature sensor fault.What size batteries does the HAY-PSUEN54-2AL use?
How much does the unit weigh once batteries are fitted?
What cable sizes should I use for mains and output wiring?
Can I connect the GEN and EPS outputs to any circuit?
How do I diagnose a fault without a multimeter on site?
Does the temperature sensor need to be connected for charging to work correctly?
Downloads
- Datasheet (Adobe PDF)
Additional information
| Output Current | 2A |
|---|---|
| Device Type | |
| Battery Charging | Yes |
| Maximum Batteries | 2 × 18Ah |
| Colour | |
| Mounting | Surface |
| Fault Relay / LED |
