run a neutral wire to pin 8 (one side of the relay coil)

run a hot wire to the common on the limit switch.

run a wire from the N/O terminal on the limit switch to pin #7 on the relay (other side of coil)

Run the load from the motor through pins 1 and 5 (n/o) on the relay...

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it's all in the way you feed power to the relays and the switches.. more details needed.. have fun.

CORRECTION!!!

On an octal socket (8 pin) relay, the coil of the relay is on pins 2 and 7, NOT pins 8 and 7!

The N.O. contacts would then be pins 1 and 3, not 1 and 5

'ice' cube, not octal..

What's your point? Most relays I have ever seen that plug into octal (meaning 8 pin) sockets are referred to as "ice cube" type because they resemble them by virtue of the square shape and clear plastic covering. There are socket relays with 8 flat blades that look similar, but even on those, the coils are labled A nd B, or A1 and A2. Terminal 1 is NOT th coil.

The original equipment manufacturer that produces these relays will have a data sheet that shows the wiring connections available. What is "proper" depends upon what is "required".

<...need to control a N/O limit switch to activate a hydraulic motor (chain conveyor)and when the chain conveyor is activated by N/O LS, the 2nd limit in N/C position to stop the signal( I need the N/O Ls when it closes to stay close until 2nd N/C brakes signal and stops the chain conveyor, the N/O LS will be activated by an arm that passes thru) ...>

This requires thinking about as part of the design process, from which the correct circuit will emerge.

The start signal--Limit switch #1-- Relay changes state and has a seal-in through N.O. contacts and will run the motor even after limit switch #1 opens and continue until the limit switch #2(N.C.) is reach and is opened if it is wired in series with limit #2 and the seal-in. The circuit would be ready for the next cycle after limit #2 returns to its closed state.

Wire control power to terminal #1.

Wire terminal #3 in series with limit #2(N.C.) and then back to terminal #2. SEAL-IN and STOP

Wire control power to limit #1 N.O. contacts and land it on terminal #2. START

Neutral lands on terminal #7.

Signal to your motor or solenoid through Terminals #8 and #6

sorry, I borrowed your relay schematic--but it is rock solid--JRaef

go to

http://www.turck-usa.com/illustrations/B1200_11.pdf

Hi Elder1

This assumes a standard 8 pin relay. The coil and pin numbers are Always marked on the relay and/or the base/socket it plugs into.

I hope this helps you:

When the Normally Open limit switch LS1 is flagged, the motor control relay coil will be energized and will close the relay contact #'s 1 & 3 and 6 & 8. Contact #'s 1 & 3 will start the motor and contacts #'s 6 & 8 will "Latch" the control relay "ON" and keep it on until the Normally Closed limit switch LS2 is flagged. When LS2 is flagged its contacts will Open and remove the power "Un-Latching" the relay and reset it to its normal state thus turning off the relay and the motor.

Have fun!

Jeff

I would only change where LS2 N/C is in the circuit to prevent the motor from being activated when that limit switch is switched. I would put in on the other side of the coil between the coil and neutral.

Or maybe even better yet. Ahead of LS1.

Like so.

Hi Keywalker

Thanks for the circuit update. It would work well as long as the same flag/flag system that flags LS1 also flags LS2.

However, if there are seperate flags/flag systems for each switch and the conveyor stopped "on" LS2 then LS1 can't start the conveyor again.

Even with my simple circuit, if there are seperate flags then the LS1 flag will have to have a longer "duration" than for LS2 to make sure LS2 is "off".

Actually, the best way is to let the cube relay control the coil of a heavier-duty motor contactor thru pins 1 & 3 of the control relay so it will last longer. Allowing the cube relay alone to power the motor would probably result in replacing the cube often due to roasted contacts.

Jeff

OK..I'm a little happier with this:

Motor starter for what?--He has a hydraulic motor and will probably open a solenoid.

Hi CrazyHaole

I stand corrected with regards to the way in which I switched the hot and neutral as if an electric motor was being used. My mistake.

But I still prefer the use of a heavier-duty motor contactor even to control the valves of a pneumatic or hydraulic motor because they will normally take more abuse and outlast a cube type relay. Plus they are able to be manually manipulated if needed for trouble shooting.

I guess I'm just a lover of over-kill.

Overkill is grand--It just seems we got off topic a little and I bet his needs are fairly simple--If I am not mistaken all he wanted was a way to seal-in the conveyor after the first switch opens after starting it and prior to the second limit switch being reached. I had to re-read the original post, before beating this one to death--Ha!

SNYGOLFSGS, I agree and had a motor starter with auxillary contacts in my mind when I pictured a simple solution.