CIRCUIT

[Bluechip]

CIRCUIT THINGY

[crueby]

Whats it supposed to be for??
 

[Jo]

Knowing Dave, It a competition to guess 

Jo

[Bluechip]

Whats it supposed to be for??
 

iT'S NOT FOUR ANYTHING ...    There's only one      

Regards

Dave

[Bluechip]

Knowing Dave, It a competition to guess 

Jo

First Prize is a ECLL800

[Jo]

May be he is being pendant-ic 

Jo

[Kim]

Is it a motor control?   The monetary contact switch starts it and supplies power to the relay which then keeps the power flowing till someone pushes the momentary contact STOP button, which interrupts the circuit so the relay opens.  And the FW/REV switch will change motor direction?

But that's likely too obvious.  But it's what I come up with.

Kim

[tghs]

<a href="https://www.youtube.com/watch?v=aqAUmgE3WyM" target="_blank">http://www.youtube.com/watch?v=aqAUmgE3WyM</a>

[Jo]

  I know someone who will need to make himself one of those 

Jo

[Roger B]

I remember from long ago in one of the UK electronics magazines a complicated circuit to drive an LED. I was described as a battery eliminator. When the LED went out the battery was eliminated     

[Jo]

I think I have just realised what Dave has started 

Jo

[crueby]

Yeah Jo, looks like a circuit to drive engineers (more) batty...!

[mklotz]

<a href="https://www.youtube.com/watch?v=aqAUmgE3WyM" target="_blank">http://www.youtube.com/watch?v=aqAUmgE3WyM</a>

I bought and assembled one of those for a desk ornament.  It makes me smile whenever I flip the switch.

It may be utterly useless but it is a vivid example of design simplicity.  There is, of course, a motor to move the arm and batteries to power it but, beyond those and the switch on the top of the box (DPDT), there is only one SPST switch; no electronic components whatsoever.  Try drawing a circuit diagram for that. 

You can have even more fun if you build two of these boxes and then construct a simple arm that (mechanically) connects the boxtop switches.  As one box turns off it automatically flips the switch on the other which then turns itself off and turns the other on...endlessly.

[Don1966]

CIRCUIT THINGY

I don’t think the  run jog switch will work for jog, it will stop just like pushing the stop push button. So what is the purpose of it?

Don

[Art K]

Hey, I had one of those useless box things, it had a snake that shut the switch off.
Art

[Bluechip]

CIRCUIT THINGY

I don’t think the  run jog switch will work for jog, it will stop just like pushing the stop push button. So what is the purpose of it?

Don

Hi All,

It's a circuit copied / derived from a commercially built VFD remote pendant.  ( Except the Speed Pot. wiring ).

I decided to make one of my own for the Myford S7  and fit it to it's industrial stand after removing the original control panel.

No Don, I came to the same conclusion as yourself when I saw it. On the original it's marked as Run/Jog so that's what I put .

Never needed to 'jog' the S7 anyway.        Got chuck keys for that. 

Dave

[Lew Hartswick]

Functional but I would prefer the controls to be in the supply side rather than the ground side .
   ...lew...

[Bluechip]

Functional but I would prefer the controls to be in the supply side rather than the ground side .
   ...lew...

I presume (?) the VFD expects those voltage levels .... 

Dave

EDIT A very cursory check suggests  the control lines sink the current to opto-couplers in the VFD... 

[Don1966]

I presume (?) the VFD expects those voltage levels .... 

Dave

EDIT A very cursory check suggests  the control lines sink the current to opto-couplers in the VFD... 

You are correct Dave. I installed a VFD years ago on my Myford lathe if you remember. It has 24VDC control and you can source or sink the controls. A jumper on mine determine which to use. And Dave I don’t need jog mode either.

Don

Edit Jo: to correct HTML codes