See attached pictures.
I am building a tubing notcher using a xy table that moves the vise held tube into a stationary rotating hole saw.

When the saw cuts thru the tubing I want it to trip the limit switch reversing the direction toward the other limit switch which then shuts the feed off making ready for the next tube.

How do you splice in limit switches to an existing control.

I have no clue about electrical things so answers should be dummied down.
Thanks, Rick

 

Anybody ???????
Send me elsewhere is ok by me.
thks Rick

 

I think the problem is there really isn't enough information available in your post for anyone to be able to help with specifics.

Furthermore, it may not be as simple as you imagine because it would be bad for the motor to change direction instantly so you will require an extra step in the middle to allow the motor to stop. It is certainly possible; consider using an inexpensive mini PLC or smart relay to automate the process, this will allow you to easily add some "intelligence" to the control. Use relays to emulate the motor control switch positions (FWD, BRAKE, REV).

 

Patience grasshopper! Do you have a model # of the drive and motor. If not, have you contacted Minarik? https://www.minarikdrives.com/contactus.aspx
It will likely require at least one DPDT relay in addition to the limit switches. But probably impossible to help with more info.

Ken

 

looks like its a four wires motor, the blue and yellow are forward and reverse, red black dc feed, so you need to interrupt the blue yellow feeds.

 

If it is a four wire motor and it is obviously a brushed type, it could be a universal motor.
Max.

 

Spend some money to hire an expert and get a good solution.

 

nice information
thanks all

 

looks like its a four wires motor, the blue and yellow are forward and reverse, red black dc feed, so you need to interrupt the blue yellow feeds.

That is what I would do. You can get a piece of those wires behind the Forward / Reverse switch. Use your limit switches to interrupt those lines for FWD and REV.

Ton

 

That is what I would do. You can get a piece of those wires behind the Forward / Reverse switch. Use your limit switches to interrupt those lines for FWD and REV.

Ton

Great comments, I'll do my some homework and play with the switch.

 

As in post #3 you may be wise to implement a delay before doing a 'instant' reverse.
Max.

 

Note that if interrupting the field wires (blue yel) without also interrupting the armature wires (red black ) the motor will behave as typical for a field loss (runaway high speed).

 

Although that may not apply if it is a universal motor as at that point the armature circuit will be open.
Max.

 

I would make an external circuit which switches the armature polarity so as to avoid field loss. Switching the lower inductance armature will allow faster fwd/Rev switching. Making the circuit external gives you a fall-back option if things don't work as expected : the working DC drive that you haven't tampered with.

I would use a programmable relay like omron zen or pilz pnoz or similar. Or possibly arduino if cost is a big factor.

 

Although that may not apply if it is a universal motor as at that point the armature circuit will be open.
Max.

I would not expect to see a universal motor used in a positioning application although it can't be ruled out I suppose. I cannot read the name plate. can we get a better hi res pic if the name plate?

 

If DC shunt motor I would have expected to see some field details on the motor plate, but it is a little hard to read.
The controller appears to have a single SCR.
Max.

 

can you take a close up of the track side of the pcb where the multi connector is, and also of the motor name plate.

 

can you take a close up of the track side of the pcb where the multi connector is, and also of the motor name plate.

More detailed pics to come when I get the assembly in my hands on Monday 11th.
Again Thanks for the many suggestions an interest.
rick