Finder 78.Y1.1.230.2412 24 V 480 W Single-Phase Power Supply

Active-PFC supply for large single-phase 24 V panels

The Finder 78.Y1.1.230.2412 is a switch mode supply for single-phase industrial panels. Its output is 24 V DC at 20 A, rated 480 W, fed from mains of 100 to 240 V AC. A double-stage design with active power factor correction gives a power factor of 0.90 or higher and an efficiency of 92% at 230 V AC. It is the larger of the 78.X1 (240 W) and 78.Y1 pair in the datasheet and mounts on 35 mm rail.

Finder quotes a boost of up to 30% for 3 seconds and a 26 A peak lasting 5 ms, hiccup-mode short-circuit protection with automatic recovery, thermal protection with automatic shutdown and a varistor for overvoltage. Compliance is stated with IEC/EN 62368-1 and UL 61010.

Technical specifications

Planning a 20 A rail

Twenty amperes at 24 V can carry valve islands, several I/O racks, drive control supplies and banks of contactors. Add the continuous current of every load and keep margin, and check the output derating diagram for the cabinet temperature, since the rated current applies up to +50 C. Where the feeder breaker is small, note the maximum input current of 2.4 A at 230 V AC and the 35 A inrush. For redundancy the datasheet specifies an external diode in a parallel arrangement.

Wiring and installation

The unit is 85.5 mm wide, so allow for it on the rail and keep ventilation clearance above and below. A stand-by consumption of 6 W is worth counting for panels that remain powered all year. The 1.5 second start-up delay at full load should be considered in the power-up sequence of controllers fed from this rail. The output voltage can be trimmed from 24 to 28 V to compensate cable drop to remote loads.

How the Finder 78.Y1.1.230.2412 works

The supply takes mains of 100 to 240 V AC and converts it to a stable 24 V DC output. In the first stage, active power factor correction pulls the input current into step with the voltage, which gives a power factor of 0.90 or higher. In the second stage, a switching converter makes the 24 V output and holds it steady when the load changes. The output can be trimmed from 24 to 28 V DC. If the output is shorted, the supply goes into hiccup mode and restarts by itself when the fault clears.

Where the Finder 78.Y1.1.230.2412 is used

• Control panels with many I/O racks
• Valve islands and banks of contactors
• Drive control supplies
• Machine builders with a single 24 V rail of up to 20 A
• Panels fed from 100 to 240 V AC mains in different countries

Selection checklist for the Finder 78.Y1.1.230.2412

• Total continuous load current, with margin, up to 20 A
• Peak and start-up current of the loads, against the 26 A boost for 3 seconds
• Cabinet temperature, with the derating diagram above 50 degrees C
• Mains range and the input breaker size
• Inrush current of 35 A peak at 230 V AC
• Hold-up time of 16 ms during mains dips
• Space on the rail, 85.5 mm wide and 134.3 mm deep
• Terminals and wire size

Installation, commissioning and maintenance notes

Clip the supply onto a 35 mm rail with free space above and below for the air to flow. Protect the input with a breaker of the right size, and connect the earth. Check the output voltage with no load and with a full load. Keep the wires short and tight in the box clamp terminals. Look at the temperature in the cabinet from time to time, because heat is the main factor in the life of a supply.

Requesting a quotation for the Finder 78.Y1.1.230.2412

Please send the load current, the mains voltage and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

78.Y1.1.230.2412 output quality

The voltage ripple at full load is 150 mV and the variation between no load and full load is below 2 percent.

78.Y1.1.230.2412 protections

The supply has short-circuit protection in hiccup mode, thermal shutdown with automatic recovery and a varistor for overvoltage.

78.Y1.1.230.2412 insulation

The insulation test is 3000 V AC from input to output and 2000 V AC from input to earth. The enclosure is IP 20.

78.Y1.1.230.2412 efficiency

The efficiency is 92 percent at 230 V AC. The stand-by consumption is 6.0 W.

Supply records for 78.Y1.1.230.2412

Keep the load list, the output setting and the date of installation with the panel documents.

Documents and quotation

The Finder 78 series datasheet is attached; it contains the outline drawings, derating diagrams and the ordering key for this and every other 78 type. To request a price for 78.Y1.1.230.2412, tell us how many units, the mains supply at the site, the 24 V current including peaks and how warm the cabinet gets. Related supplies are listed under Power Modules.