Circuit mayhem and restless nights

I can wire it--I just have a hard time speaking it-or may not be able to speak it at all!--AAAAKKKKKK!--NEED WIRE AND RELAYS AND TERMINAL BLOCKS AND................................

Center limit switch would be closed if left and open if right or visa versa(would have to have a physical surface for a limit switch).

I could wire this up and have it working.

That's the same problem I get! If I had the pieces I could play around with them! Intresting diagram though! I will run it through the brain for a while!

For the rest of functions (button C and center position) we need to talk money.

That look an interesting diagram! I will check it out and who knows maybe I could explain how the euro has made living in Spain expensive!

I've checked it out and it's just a tad too small for my eyes! Any chance you could make it a touch bigger please?

But it looks good so far!

Thats a good starting point indel! Cheers I normally only work with AC so this DC stuff had me a bit foxed but now I see what is going on it seems to make more sense!

I can run any amount of circuits in between the top rail and the bottom one without affecting the other circuits (unless I want it to!)

I will sit down and think some more tonight!

Please excuse the crappy drawing but I was so excited to find a question that I could actually answer.

I like your style ffej!

I have a book half full of circuit diagrams like this so I feel your pain bud! What is the purpose of the '2nd contact from switch'? Is it the NC I have running next to the NO in the original attempt? Any ideas on the return to center and stop button? I can talk to you about the difference the Euro has made to the Spanish economy as well if you like!

I know I'm guilty of over-think and probably overkill! All these relays and contacts could probably be done away with using a single little black chip with a few wires hanging out of it! Which brings me to you and your cosy secret nest Del! Has the cat got any alternative ideas to get this thing up and running? I know you just want to watch but cats and curiosity seem to go so well together!

I think I've cracked it but I could be wrong! Cast your eyes over this latest offering and give me your verdict! I took Indels circuit and added a few more bits! The limit contact has two contacts, one to open the relay hold-in circuit and one to close the appropriate return circuit after you have pressed the button c, which also has two independent contacts! The magnetic sensor is normally closed until the magnet approaches, then it opens the hold in circuit! I hope I'm on the right track!

The last part of logic I wrote is missing a contact on each rung. I would define the position for the armature as left or right and use a switch to determine it--Say, open when left of center and closed when right of center.

IF the armature is right and the motor control is commanding it right(or not commanded either way), a push of the CENTERING push button would send it left, UNTIL the centering limit changes state. Visa Versa for left.

I would use a simple interlock for direction--normally closed contacts, in series with opposite direction contactors. The limit switches wired NC in series for stops with the same direction---Left goes left until the left limit is made and opens that contact. Use a normal seal in so that dropping the contactor or relay out will require a new start or centering signal.

Assuming that one button switch closes both C and D there's only one problem: you need to swap NO contacts C and D. Otherwise C which is enabled by limit contact A is trying to drive the motor in the same direction as A (and, D which is enabled by limit contact B is trying to drive the motor in the same direction as B).

Unless I've completely misunderstood.

EDIT: Sorry didn't read Kilgore Trout's reply. I think he's saying approximately the same thing.

Thanks--I think I was-

Use a NO contact on the forward contactor in series with the run command for reverse. Interlock it both ways.

you need to swap NO contacts C and D

Should read:-

you need to swap NO contacts C and D in the final motor drive section

I was mistaken on the last--Use NC contacts in series with opposite run signal for the interlock.--Sorry.

Oh my giddy aunt! You've thrown me now! If I understand right, then I need to change the contacts! I've got the motor running in the same direction as it was going when it hit the stop contact! My eyes were going crossed last night and I thought it was possibly the wrong way round! So apart from that, would it work? Is there an easier way of doing this whole setup?

I think so:-

There probably are simpler ways but keeping everything simple like this seems like a good plan. You might need to think about timing a bit to ensure that you never short out the rails.

Excellent Randall. I forgot to join the two switches in the middle on the drawing but I knew they were connected! Now I just need to source the parts and build the bugger!

Thanks for your help and everybody else's help! I'll let you know if it works for real when it's all made up!

Hello Mr. Truman Brain,

What happen to motor rotation if you swap the leads at the battery?

Only problem I can see with that would be any relay that was energised would loose it's power momentarily thus disengaging its hold in circuit!

A capacitor would help?

Yup, that's the great advantage of a DC circuit!
A C&R added in can give a nice hold time, as hold in voltage is much lower than pull in voltage.

Del

But would changing the battery orientation instead of the motor make the circuit any simpler?

A push button can change the terminal orientation at either end simply?