Hi,
I have seen many automation equipments providing 5V interface, but all industrial devices, relays and sensors work on 24V. So I need to know how to convert 24V to 5V and vise versa with complete protection & isolation
2006-07-18 02:38:02 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
There are IC-like devices with 4 legs that have a LED on one side, and a photo transistor on the other. They are called Opto - Couplers. Run your 5V signal (via a 220 Ohm resistor) into the LED side, and control your 24V relays with the photo transistor.
Make sure the opto coupler can handle the current, or else add another emittor stage transistor between opto coupler and relay. Also make sure you have a reverse-current diode across your relay coil, otherwise the transistor may die.
Some electronics knowledge and soldering skills are needed.
2006-07-18 02:46:37 · answer #1 · answered by Marianna 6 · 3⤊ 0⤋
You will still need a 24V supply to drive a motor, or other device that is rated for 24V. You maybe can change the logic to 5V, but that is about it.
2006-07-18 02:46:48 · answer #2 · answered by Christopher 4 · 0⤊ 0⤋
DC to DC converters that isloate the outputs are very common. You can convert the 12VDC to 5VDC or the 5VDC to 12VDC with complete isolation. I have worked on equipment that ran on 24VDC postitive ground. I installed an DC to DC converter for some equipment that required 48VDC negative ground. No problem.
2006-07-18 18:11:07 · answer #3 · answered by Anonymous · 0⤊ 0⤋