medic29
07/08/2007, 10:57 AM
Okay....I know this has been discussed in the past and over the past couple of days I have read several posts from various threads, but being a visual learner at times, I'm still having difficulty wrapping my brain around the details of how to wire the circuit. The schematics didn't help much because of the symbols and it has been way too many years since my electronic classes. With that said, please bear with my simple drawings.
Now to the point, I'm basically trying to set up a circuit using float switches and a relay to power a pump. I would like the lower float switch to turn the pump on and pump water into the container, then the upper float switch will break the circuit and the pump will shut off. I've read that this involves a latch relay circuit and believe I understand the concept, but figuring out the wiring between the float switches and relay is what has me confused, so I made some simple diagrams which are shown below.
http://medic29.home.insightbb.com/bnarc/latch_relay_2.bmp
From looking at a diagram I found in one of the posts I believe Bean came up with, this is how I think the relay and switches should be wired.
The question I came up with in this situation is if for some reason float switch #2 failed to close and remained open, then as I see it the pump would never get power and if this was being used as a top off for a sump, the sump could essentially run out of water because it never got "topped" off - albeit rare.
http://medic29.home.insightbb.com/bnarc/latch_relay_1.bmp
Would wiring up the relay like this work. It seems it may do the same, but with one benefit...float switch #1 would always trigger the relay and thus power the pump. If float switch #2 failed and remained open, the relay would never latch and thus the "sump" or tank would never fill, but it would also not fall to a level below the level of float switch #1.
Is this correct? Am I understanding and seeing this the right way? And finally, do I have the wiring correct for a DPDT relay?
Any help and/or explanation would be greatly appreciated.
Now to the point, I'm basically trying to set up a circuit using float switches and a relay to power a pump. I would like the lower float switch to turn the pump on and pump water into the container, then the upper float switch will break the circuit and the pump will shut off. I've read that this involves a latch relay circuit and believe I understand the concept, but figuring out the wiring between the float switches and relay is what has me confused, so I made some simple diagrams which are shown below.
http://medic29.home.insightbb.com/bnarc/latch_relay_2.bmp
From looking at a diagram I found in one of the posts I believe Bean came up with, this is how I think the relay and switches should be wired.
The question I came up with in this situation is if for some reason float switch #2 failed to close and remained open, then as I see it the pump would never get power and if this was being used as a top off for a sump, the sump could essentially run out of water because it never got "topped" off - albeit rare.
http://medic29.home.insightbb.com/bnarc/latch_relay_1.bmp
Would wiring up the relay like this work. It seems it may do the same, but with one benefit...float switch #1 would always trigger the relay and thus power the pump. If float switch #2 failed and remained open, the relay would never latch and thus the "sump" or tank would never fill, but it would also not fall to a level below the level of float switch #1.
Is this correct? Am I understanding and seeing this the right way? And finally, do I have the wiring correct for a DPDT relay?
Any help and/or explanation would be greatly appreciated.