by Voxintech-admin@2022 Voxintech-admin@2022

How to Size a 24V DC Power Supply for Your Industrial Control Panel

Undersized power supplies are one of the most common causes of intermittent panel failures. A system that works perfectly on the test bench can behave erratically in the field because the power supply cannot handle the real-world load profile. This article provides a practical, step-by-step method for correctly sizing a 24V DC DIN rail power supply.

Step 1: List Every Connected Load

List every device drawing power from the 24V DC bus: PLC CPU and I/O modules, HMI panel, sensors and transmitters, solenoid valves, relays, signal conditioners, communication modules, and indication lamps. Record the continuous current draw from each datasheet.

Step 2: Calculate Total Continuous Load

Sum all continuous current draws. A typical mid-size panel with a compact PLC, 8 to 12 sensors, an HMI, and a few solenoid valves might total 2.5 to 4 amps.

Step 3: Account for Inrush Current

Solenoid valves can draw 3 to 5 times their holding current for the first 20 to 50 milliseconds. If multiple solenoids energise simultaneously during a machine reset, the combined inrush can cause a voltage dip that resets the PLC.

Step 4: Add Headroom

Size the power supply at 70 to 80 percent of its rated capacity for continuous operation. For a 5A supply, your continuous load should be 3.5 to 4A maximum. This accommodates inrush events, future expansion, and ensures longer service life.

Step 5: Consider Derating

Most supplies derate linearly above 40 to 50 degrees Celsius. If your panel reaches 55 degrees and the supply derates to 80 percent, a 5A supply effectively becomes 4A.

Practical Example

Packaging machine panel: PLC CPU 0.5A + 4 I/O modules 0.6A + HMI 0.8A + 6 sensors 0.18A + 4 solenoids 1.2A + comms 0.3A + LEDs 0.1A = 3.68A total. At 75 percent loading: 3.68 / 0.75 = 4.9A. Correct choice: 5A (120W) supply.

 

VXT-DRI: Right-Sized Options

The VXT-DRI series covers 24V at 1A (25W), 2.5A (60W), 5A (120W), 10A (240W), and 20A (480W). Each model features wide input range, full protection, and compact DIN rail mounting.

by Voxintech-admin@2022 Voxintech-admin@2022

How DIN Rail SMPS Powers Smart Factory Automation in India

Indian manufacturing is undergoing rapid transformation. Factories are embracing smart automation with PLCs, IoT sensors, SCADA systems, industrial Ethernet networks, and edge computing devices. At the heart of every smart factory panel sits the DIN rail switched-mode power supply — the critical enabler that makes all of this possible.

The Expanding DC Power Ecosystem

A decade ago, a typical panel contained a PLC, a few relay outputs, and a handful of sensors powered by a single 24V 2.5A supply. Today, the same panel might include multi-module PLCs, HMI touchscreens, IO-Link masters, industrial Ethernet switches, edge gateways, and vision system controllers. The total power demand can easily be two to three times higher.

Why Power Quality Matters More in Smart Panels

Modern smart devices contain sensitive microprocessors and communication circuits that malfunction with even brief voltage dips or excessive ripple. Smart panels also increasingly require multiple DC voltage levels — 24V, 12V, 5V, and sometimes 48V. Best practice is dedicated DIN rail supplies at each voltage level. Using multiple smaller supplies also creates isolated power domains, improving reliability.

Designing for Uptime and Expandability

Critical production environments are adopting redundant power supply configurations where two supplies share the load. If one fails, the other takes over seamlessly. Smart factory panels should be designed with 30 to 40 percent power headroom to accommodate expansion as digital transformation progresses.

VXT-DRI Series: Ready for Smart Factory Panels

The VXT-DRI series covers 24V, 12V, and 5V outputs from 15W to 480W — letting panel designers select the right voltage and capacity for each subsystem. Low output ripple, wide input voltage range, compact form factor, and comprehensive protection make the VXT-DRI ideal for modern automation at a competitive price point. Ready stock from Delhi NCR.

by Voxintech-admin@2022 Voxintech-admin@2022

Din Rail Power Supplies (SMPS) : The Complete Guide for Panel Builders and OEMs

Every industrial control panel needs reliable DC power. PLCs, sensors, HMIs, communication modules, solenoid valves, and signal conditioners all require stable 24V DC, 12V DC, or 5V DC supplies to function correctly. DIN rail-mounted switched-mode power supplies (SMPS) have become the universal standard for delivering this power efficiently and reliably. This guide covers everything panel builders and OEMs need to know about selecting the right DIN rail power supply.

Why Switched-Mode Power Supplies?

Older linear power supplies converted AC to DC using a transformer and linear regulator, which was simple but inefficient. A typical linear supply operates at 40 to 60 percent efficiency, meaning 40 to 60 percent of the input power is wasted as heat. Switched-mode power supplies use high-frequency switching circuits to achieve 85 to 92 percent efficiency, dramatically reducing heat generation, energy waste, and the size of the unit.

Key Specifications for Selection

  • Output Voltage and Current :  The most common output voltages for industrial applications are 24V DC (for PLCs, sensors, and I/O modules), 12V DC (for certain HMIs, cameras, and LED strips), and 5V DC (for logic circuits and some communication modules). Size the current capacity with at least 20 to 30 percent headroom above the total connected load.
  • Input Voltage Range : Indian mains supply can fluctuate between 170V and 280V in many industrial areas. Choose a power supply with a wide input range, ideally 85-264V AC, to ensure stable output across all conditions.
  • Efficiency and Protection : Look for supplies rated at 88 percent efficiency or higher. Essential protections include short-circuit protection with automatic recovery, overload protection with hiccup mode, over-voltage protection, and over-temperature protection with auto-shutdown.
  • Operating Temperature Range : Standard industrial power supplies are rated for minus 20 to plus 60 degrees Celsius. Verify the derating curve — many supplies reduce output current above 45 or 50 degrees. Size for the derated current if your panel regularly exceeds 50 degrees internally.

VXT-DRI Series: Built for Indian Industrial Conditions

Voxintech offers the VXT-DRI series of DIN rail SMPS power supplies designed for the Indian market. Available in 24V, 12V, and 5V output voltages with power ratings from 15W to 480W, the VXT-DRI series features a universal 85-264V AC input range that handles Indian voltage fluctuations without derating. Every unit includes full protection circuits, LED power-on indication, and compact DIN rail mounting.
Through its factory-direct sourcing model and rigorous quality validation, Voxintech delivers these power supplies at 35 to 50 percent lower cost than comparable units from Mean Well, Omron, or Schneider. Ready stock is maintained at the Delhi NCR warehouse with same-week dispatch for standard SKUs.

by Voxintech-admin@2022 Voxintech-admin@2022

Mean Well vs Value-Engineered Power Supplies: A Practical Comparison for Indian Panel Builders

Mean Well has long been the default choice for DIN rail power supplies in Indian control panels. Their reputation for reliability is well-earned. However, the industrial power supply market has evolved dramatically. Today, several value-engineered brands produce power supplies that match Mean Well specifications at significantly lower price points.

The Mean Well Advantage

Mean Well is a Taiwanese manufacturer with decades of experience. Their advantages include extensive safety certifications, a very wide product range, established distribution in India, detailed datasheets, and a trusted brand name. For export markets or regulated industries where specific UL, CE, or TUV certifications are mandatory, Mean Well remains a safe choice.

The Rise of Value-Engineered Alternatives

A tier of established manufacturers has emerged that invests in quality components, operates ISO-certified production lines, achieves genuine CE compliance, and supplies to OEMs across Europe, North America, and Japan. Brands like Voxintech have built their reputation by carefully selecting manufacturing partners, validating every specification independently, and standing behind the product with local warranty support.

Where the Real Difference Lies

Price  A typical Mean Well 24V 5A DIN rail supply costs an Indian panel builder 1,800 to 2,500 rupees. A comparable VXT-DRI unit from Voxintech comes in at 1,000 to 1,400 rupees — a saving of 35 to 50 percent. For a panel builder producing 50 to 100 panels per month, this translates to meaningful annual savings.

Specifications

Key specifications are comparable: 85-264V AC input, regulated 24V DC output, 88 to 92 percent efficiency, full protection suites, and minus 20 to plus 60 degrees operating range. The critical difference is in verification — work with a supplier like Voxintech who validates performance independently.

Reliability

Key specifications are comparable: 85-264V AC input, regulated 24V DC output, 88 to 92 percent efficiency, full protection suites, and minus 20 to plus 60 degrees operating range. The critical difference is in verification — work with a supplier like Voxintech who validates performance independently.

Making the Right Choice

Panel builders can adopt a tiered strategy: Mean Well for export/regulated panels, VXT-DRI for domestic market and price-sensitive OEM projects. Voxintech provides local warranty support and ready stock from Delhi NCR, eliminating procurement risk.