If I understand correctly, most battery powered circuits use the negative side (i.e. the wires and components connected to the negative terminal of the battery) of the circuit as the "ground" when represented in diagrams, and is what the ground pin of the second kind of integrated circuit is (at least usually) connected to. Why does the first kind of IC require a "split supply" in order to work properly? Why aren't batteries considered "split supplies"?
I am working on a simplex 4100es. The panel is currently normal, but this customer has been experiencing intermittent trouble regarding card 1, ES Power Supply negative earth ground. LED 4 is lit up on both power supplies. My tech support thinks it may be a bad power supply, but myself being super new to the fire alarm gang, was wondering if there was something else I should check?
I'm building multi-room speakers around a Pi Zero, and I need a 24V PSU to power it all.
I'm aiming for this one.
On the AC side, it only has two terminals for power and one round one for ground.
How do I connect the cable from the power outlet to the PSU so that it is properly grounded? I'm using a regular "kettle"/C13 cable that I'll plug into a socket that is screwed in the device's enclosure so that there is strain relief. But the socket only comes with 3 wires that are bare at the end... How do I connect the ground? Just solder it over the hole next to the 2x AC?
Iβve been reading that floating is the norm but am unable to find a clear answer as to why. Many sources say ground loops are the reason but Iβm not using the power for data communications, itβs just to power discrete I/O. Wouldnβt earth ground help prevent static buildup and resulting damage to solid state inputs?
I've been taught that connecting power supply grounds together can cause issues but it was never explained why.
For context, the power supplies I am referring to are DC, not identical and may even be in separate buildings. One, both or neither ground may be connected to the earth. They could also be different voltages.
For more context, I work in electronic security and access control. A particular scenario may be a local 12VDC power supply for controllers and locks and an external 24VDC signal from a fire indicator panel located remotely. One of the power distribution modules we work with connects the grounds together.
What problems could this cause if any?
Using a very common dual effect pedal wiring schematic http://tagboardeffects.blogspot.com/2012/02/offboard-wiring.html?m=1
When i initially had the ac circuit effect first and the dc 555 circuit 2nd the bypass was pure, but the ac amplification (dual rail op amp) flowing into the dc circuit did not allow both effects to be on at the same time, so i switched the order. Now the parasitic dc is found at the output when the bypass is on.
Both circuits share the commom ground of the power supply. So i guess my question pertains to the best way of isolating the dc from the ac. I could wire the dc footswitch so that common ps ground wouldnt be in the bypass, only the other switch position that would mean the circuit would be on. Then the parasitic nature wouldnt matter. But Id be worried about an unwanted noisy bypass if so.
Im really curious as to why this is happening, my knowledge of electronics is def missing this part haha Thanks in advance for any advice!
using 5v LEDs, 60a power supply, digi uno to control it.
20 feet of LEDs (253 Pixels) are running across my gutters, so far so good on that end. That run uses about 14 feet from the power box on 18Gauge cabling along with 20ga for power injection, power injection after the first 16.4 strip and then at the end as well.
Im guessing the 2nd story window ones will need about 20-25 feet of cabling to run power there.
As I understand it. the digi-uno is at its max of 15 amps for the 253 pixels on my gutters, I know thats assuming worst case scenario but better to be on the safe side. So I don't think I can run the next set of LEDs off the end of the gutter run. Which is why I'm thinking I need to run a wire directly from the power supply to the next run on the second story, hence 20-25 feet. I'm also assuming 20-25 feet of 18 ga wire will not provide enough voltage. Am I overthinking it or is it as simple as bumping up the wire gauge?
If my assumptions are wrong, or if you have any advice, I'd appreciate it.
Thanks!
So this is my first PC build and I was doing research on anti static mats and anti static wrist straps to prevent any of my parts becoming damaged. I was planning to build my PC on a wooden desk that is on concrete floor. As for grounding, I was looking to buy a anti static wrist strap and anti static mat, would doing all that lessen the chances of any possible damages?
Also one more question about grounding, can I connect both my wrist strap and anti static mat to my power supply when it is plugged in but turned off? Many of the mats I was looking at had it connecting to ground wires, and all the wrist straps only have it connecting to the power supply.
Feb 14th update: I added some simple daylight white LEDs to the bottom middle row and moved the addressable LEDs to the top to match the other shelves. The expensive stuff is on the lower middle shelves, small-batch Pennsylvania distillery products.
Valentine's Day, Updated Project Pic
I am using the 80% rule of DC power, So I am using two power supplies. I had two βLEDMOβ power supplies; one craped out already, LEDMO power supplies are not good quality, junk. I replaced the power supply with a better quality SHNITPWR 12V Power Supply 30A 360W. (Much better quality and construction.)
Here is where things took a turn for the worse for me. When switching out the power supply, the neutral wire popped out of the spade clip, hitting the LED 0-Volts DC ground side. I checked out the power supply, and it was fine. Now the middle and the right-hand side were displaying random colors. My first thought, I just killed β $150 LED stripe tape! I rechecked the voltage, OK 12 Volts, and the control voltage is present. Maybe I killed a few of the first LEDs, start isolating the bottom middle row for trouble-shooting. The connections are problematic, to begin with, and the first LED appears to be dead.
Note: Never buy these terminal blocks. They extremely difficult to work with; some of the screws were missing, and the metal bus falls out. https://smile.amazon.com/gp/product/B075ZRZX8M/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
After two or three hours of fooling around with the connections and trying to salvage some of the LED strip tape, I was ready to quit. I wanted to try one last thing before leaving; I took the bottom middle LED section to the controller and the single amplifier and hooked it up. It started working, what the F. Then it dawns on me. Even though I did not tie the ground together on the 1st two power supplies (It worked fine before without a common ground), I should tie the common ground together on both power supplies. Please!! Learn from my stupid mistake that cost me three or four hours of frustration. It should have been a 5-minute fix. (I still need to replace the bottom row, lost a few inches of LEDs.) Ughhh!!
Rule: When using more than one power supply with addressable led strip tape,
... keep reading on reddit β‘
I will write some facts I believe to be true to expose my doubts, please correct me if im wrong.
I know we connect 0v to ground with the purpose of not having high floating voltages, and to make all devices have the same refference.
I normally have the plc internal ps feeding all plc modules and the auxiliary 24dc feeding hmis, sensors and actuators. Is this totally right?
Normally both the plc internal ps and the auxiliary ps are connected to the same ground with power equipment and there are no problems. But I have also seen in extreme high power motors or power converters, two different grounds, one for the controls, one for the power. Wiring them together introduces a lot of noise, mostly on communications and PT100 modules. Why is this?
In this cases, I have seen them connected to different busbars. Are this busbars connected physically together anywhere up in the scheme?
When having servos with "specials" voltage like 48vdc, do we also connect these ps to ground?
Another example, a load cell sited on field , wich transmitter has an internal 10vdc to feed the sensor. Is it important where do we physically ground this 0v? I mean... Field or panel?
Why dont all this connections to ground eventuallty trip the RCDs? I suppose, it takes 0V only as a refference, so no current flowing these connections in normal work...
Thanks.
