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It's a crappy job but we prefer it that way. This gave me a chuckle when I read it for the first time. It was printed on a lift station pump supply company T shirts. Unfortunately I don't remember who the supply company was. Last question did you ever work on a control panel with a bubbler...

Unfortunately this happens more often than one realize with contractors. They try to save a buck and cause more problems. I bet between both of us could write a book about some of the nightmares we seen. On the plus side they do not stay in business very long. The key there is experience in...

The panels that I have designed and built for the State of Fl. the RTU systems had to include a 24 hour back up battery for loss of 120 VAC power. That is why we used dc relays. The RTU systems for duplex lift stations used radios that required 12 vdc so we used 12vdc relays. The RTU had to...

This may be a waste but just in case For anyone who is reading this just out of curiosity that does not know what the acronym PLC, SCADA and RTU stand for. PLC stands for programmable logic controller. RTUs are referred to as remote telemetry units SCADA stand for Supervisory Control and Data...

While lying here with a tube in my throat, bored out of my mind I decide to look it up. 1970 Mar 07 12:25 14:54 major partial - near total path 1970 A long time ago in a galaxy far, far away puts me in middle school not grammar school I stand corrected.

Same here but is was so long ago I do not remember. I was in grammar school (I think) in N.Y

I really enjoyed reading your post it was insightful and it included your own personal experience. But just for clarification you do use DC in your panels, (Supplied by the PLC rack / brick) you just prefer not to use 24 vdc control relays. Ok i understand that but ........ ( You know what they...

Be safe, talk at you later.

A lot of your smart relays and PLC mix both AC and DC signals . There are a lot of 4 to 20 ma sensor signals which is typically powered by DC voltage ranging from 8-32 VDC . The reason for using the current signal is that it is not easily disturbed. And the internal resistance of the current...

All thanks to my stupidity and a little help from Uncle Sam , Smoking, asbestos exposure Aqueous film forming foam exposure ,lead and all other nasty exposures with little or no protective gear. 🙄 The sugar refinery I work at was refining sugar since 1862 talk about some old switch gear, there...

Welcome aboard Navy

Agree with you I do. I thought you may have drawn the circuit wrong, but your intention was correct. That is why I stated But I guess some over look that part. Oh well no harm done. We all learn from each other, that is why I enjoy this site. Thank you minh-thanh for understanding my intentions.

Wow, that's impressive work. Thanks for sharing. 🙂

Funny you should mention a refinery. I used to be the lead electrical engineer on the second shift at a sugar refinery located in NY (First civilian job after I served my first 4 years in the navy back in 81) own by a London-based company Taten Lyle and its subsidiary Toronto-based Red Path...

'Motor starters are often wired with the sealing contact parallel to the starter coil.' Sorry but no. If you look at this ladder diagram you will see the sealing contact is in parallel to the start button, not to the starter coil. 'If there is a power interruption, or a brownout, the coil...

See here for more info. https://www.electrical4u.com/latching-relay/ In this Circuit replace B2 with the fuse and you have the same as minh-thanh circuit, minus. the nc contact...

It looks like he is trying to use the relay as a circuit to latch the (Low Voltage DC) power circuit to the motor. When the fuse blows the motor is removed from the power supply by the relay. The power supply will still be energize but the motor load has been remove. To restore power to the...

Have a look here https://www.powerelectronictips.com/basics-power-supply-self-protection/ and here https://www.electronicdesign.com/technologies/power/power-protection/whitepaper/21120596/protection-for-the-power-supply-and-its-load

Just a quick update, I have not give up on this build. I had to take another unscheduled vacation from the work shop. 🤢