Author: mmldigi

Power Supply Derating Explained: What the Nameplate Doesn’t Tell You

Power Supply Derating Explained: What the Nameplate Doesn’t Tell You Open a datasheet for almost any switching power supply and you will find two numbers that seem to disagree. The first, on the front page, says 240 W. The second, buried near the back, is a chart showing that at 70 °C the same unit […]

Power Supplies in Parallel: Safe Methods for Higher Current and Redundancy

Power Supplies in Parallel: Three Safe Ways to Combine Two Supplies for Higher Current or Redundancy Can you connect power supplies in parallel? Yes, but almost never the way people first try. Tying the positive outputs of two ordinary supplies together is the one move that can damage both. Yet combining two supplies safely is […]

Isolated vs Non-Isolated Power Supply: What Actually Changes Inside Your Panel

Isolated vs Non-Isolated Power Supply: What Actually Changes Inside Your Panel If you have searched “isolated vs non isolated power supply” lately, you know the confusing part: half the results cover guitar pedal power bricks, the other half aerospace spec sheets. Neither answers what the term means for the 24 V supplies that run sensors, […]

Encoder Troubleshooting: Is It the Encoder or the Chain?

Encoder Troubleshooting: Is It the Encoder or the Chain? If you came here to fix a keyboard volume knob, a mouse wheel, or a video encoder card, this article is not for you. We are talking about the industrial rotary encoder bolted to a motor or a machine shaft. It is the part that tells […]

Incremental Encoder Wiring: A/B/Z Signals, Output Types and PLC Connections

Incremental Encoder Wiring: A/B/Z Signals, Output Types, and the Specs to Lock Before You Order The machine runs, the motor spins, and the counter on the panel shows nothing. Or it counts in the wrong direction. Or the replacement encoder lets the smoke out on power-up. In all of these scenes the wires are usually […]

Time Delay Relay Working Principle: How the Five Timing Functions Behave and What Happens When Power Dies

Time Delay Relay Working Principle: How the Five Timing Functions Behave and What Happens When Power Dies Ask five different sources how a time delay relay works and you will get five different answers. Not because they disagree, but because most explanations blur two separate questions: how the delay is physically made, and how the […]

Relay Coil Voltage Explained: How to Read, Choose and Match It

Relay Coil Voltage Explained: What the Number on the Case Means (and How to Match It) A relay case carries two voltages: “24 VDC” and “250 VAC 10 A.” The first feeds the relay; the second is what it switches. Mixing them up is the most common relay mistake in the field, and it ends in a burned […]

Solid State Relay Troubleshooting: Is It the SSR or the Circuit?

Solid State Relay Troubleshooting: Is It the SSR or the Circuit? A solid state relay fails on a different physics than the mechanical relay it replaced. Test it with mechanical-relay habits and it will mislead you. Its semiconductor output leaks current when off, can look dead to one multimeter and fine to another, and fails […]

Photoelectric Sensor Wiring Diagram: 3-Wire, 4-Wire and Through-Beam Sensors

Photoelectric Sensor Wiring Diagram: 3-Wire, 4-Wire and Through-Beam Types (Light-On vs Dark-On Explained) If you’ve ever stood in front of a machine with a dead photoeye, holding a replacement that has more wires than the old one, this guide is for you. Photoelectric sensor wiring looks intimidating because the same three or four wire colors […]

Proximity Sensor vs Photoelectric Sensor: Let Material, Gap, and Output Decide

Proximity Sensor vs Photoelectric Sensor: Let Material, Gap, and Output Decide Ask ten automation suppliers which sensor is “better” (proximity sensor vs photoelectric sensor), and you will get ten confident, contradictory answers. Ask the machine instead, and the argument mostly disappears. A 5 m photoelectric beam is not better than a 5 mm inductive unit; […]