Frequently Asked Questions (FAQ) – Phoenix Contact UNO-PS/1AC/24DC/100W:

1/ What input voltage range does the unit support?

The UNO-PS/1AC/24DC/100W operates from 85 to 264 V AC (50–60 Hz), allowing worldwide use without additional transformers or adapters.

2/ What are the nominal output voltage and current?

It provides a stable 24 V DC output at up to 4.2 A (–25 °C to +55 °C), delivering a continuous 100 W of power.

3/ How efficient is the power supply?

Typical efficiency is 88 % at 120 V AC and 89 % at 230 V AC, with idle losses below 0.5 W to minimize energy waste.

4/ What protections are integrated into the device?

It features internal transient surge suppression via varistor, short-circuit protection with HICCUP characteristic, overvoltage protection at ≤ 35 V DC, and an internal slow-blow 4 A input fuse.

5/ Can multiple units be connected in parallel or series?

Yes. Units can be paralleled for redundancy or increased capacity, and connected in series to achieve higher output voltages for custom applications.

6/ What is the inrush current and mains buffering capability?

Inrush current is below 40 A (typical), with mains buffering times exceeding 20 ms at 120 V AC and 100 ms at 230 V AC to ride through brief power dips.

7/ What is the ripple and regulation performance?

Output ripple is under 30 mV pp. Line regulation is better than 0.1 % for ±10 % input variation, and load regulation is within 1 % (static) and 2 % (dynamic 10 %–90 % load change).

8/ What are the operating temperature and derating guidelines?

The unit runs from –25 °C to +70 °C. Above 55 °C, output power derates at 2.5 % per degree to maintain reliability. It can start at –40 °C and be stored between –40 °C and +85 °C.

9/ How is the device mounted and wired?

It snaps onto a 35 mm DIN rail (EN 60715). Input/output connections use M3 screw terminals for conductors from 0.2 to 2.5 mm² (AWG 24–14), tightened to 0.5–0.6 Nm, with an 8 mm stripping length.

10/ What are the unit’s dimensions and weight?

The housing measures 55 × 90 × 84 mm (W×H×D) and weighs approximately 0.34 kg, offering high power density in a compact form factor.

11/ What is its reliability (MTBF)?

Mean time between failures (MTBF) is around 738,000 hours at 40 °C, reflecting robust design for continuous industrial use.

12/ Which certifications and standards does it meet?

Compliance includes IEC 60335-1 for basic safety and EN 61000 for electromagnetic compatibility. It meets pollution degree 2 and climatic class 3K3 requirements.

13/ What accessories and documentation are provided?

Each unit ships with the UNO-PS/1AC/24DC/100W power supply, wall-mount brackets (optional screws), and a user manual containing wiring diagrams and safety instructions.

14/ How do I order and what warranty applies?

Order via QTE Technologies. A standard 12-month manufacturer’s warranty covers defects and supports spare-part replacement.