relay motor and valve control
relay motor and valve control
(OP)
I created a 220vac circuit where I'm using relay contacts to swtich on/off a valve and a motor contactor. Is there a way I can effectively 'debounce' the contacts using a small inductor or something? The coils of the relays are 'controlled' by other switches. I will gladly put the schematic up if someone will tell me how to get it in here...






RE: relay motor and valve control
xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: relay motor and valve control
thanks....
RE: relay motor and valve control
xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: relay motor and valve control
Do you know how I can insert a pdf here?
RE: relay motor and valve control
These are all good reasons to use a PLC or Smart Relay by the way.
Regarding posting pdfs, it is the same as posting an image. Read this FAQ for instructions, although a pdf file will post the same as a jpg. The problem with doing that is that is embeds the image of the pdf into the forum thread and increases bandwidth usage, which is especially problematic for those with slow access. Better to follow the instructions but just post a link URL to the website that contains the pdf rather than embed it.
FAQ238-1161
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: relay motor and valve control
Actually I've got the relays wired up to latch, however, if the coil input is not solid, it still effects the contacts....I set up a test circuit and blew breakers and threw sparks and soforth when hitting the swtich a few times....So if i want to 'debounce' the switch, there isn't some sort of simple little RL circuit or something I could throw in there?
I do not have a URL to post the dwg to.....it's very small, 26k I htink.....hope it won't cause too many problems...:)
Thanks,
Mark
RE: relay motor and valve control
RE: relay motor and valve control
The professional way to fix this would be to purchase a $30-$60 "delay-on-break" relay. This is a relay that, once closed, stays closed, until the signal to it goes away for a certain period of time you set. So if you set it for say, two seconds the contacts can open and close over and over but the relay's output will stay closed until the input 'stays open' for a full second.
Here is an example: You must determine for yourself if it is the correct function etc.
http://w
There are others that have separate inputs and outputs which may make more sense in your application.
http://w
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: relay motor and valve control
Not sure I filled you in on the scenario...I'm running a motor with a hydraulic pump on it that has a pressure up gravity down cylinder.. The load on the cylinder is just weight now, seems to overcome gravity at around 80 pounds.
So when I hold the down swithc until the motor starts moving the cylinder, no problem. However, the test I want to do, I need it to fall down on the switch and start the motor to push it back up and soforth. I am having trouble figuring out a way to maintain that switch for a second or so....I can't spend $50 on a cool timer relay, but foudn that using a 2-pin helped. with the overcurrent problem....
After about 3 ups and downs, it would trip the 15A breaker, when I put a delay timer in line with the motor, that stopped, but I started getting my original problem of the "start" or down limit swtich not latching.....here's the dwg I've got hooked up now.....hope this works...please let me know...
http://i9.tinypic.com/446680y.jpg
I really don't understand what's going on...I'm fairly certain it's due to my ignorance of ac and of inductive properties....
RE: relay motor and valve control