Need a latching switch retrofit for VFD. Currently 30mm momentary

[Slowboat]

I’m completing the retrofit of my Deckel FP1 to VFD using a Teco l510.

I have 3 momentary switches on the Deckel. Speed 1, stop, speed 2.

Plan was to have the VFD set at 30hz for speed 1, and 60hz for speed 2.

I have it wired with 3 wire control, and speed 1 and stop are working. Speed 2 is working if I hold down the momentary button.

I called teco tech support and they confirmed that you can’t reconfigure the L510 to work with the preset speeds with a momentary button.

I really want to keep the fronts of the existing buttons as they match the mill and look great.

They appear to be Elan momentary switches, maybe model 512. I haven’t been able to find anything online.

Mounting screws appear to be 23mm apart. They are M3x.5

I’m looking for either a back half switch that is latching, or making a mount for a standard latching switch if not and using the front of the existing button.

I have also purchased a couple of digital latching relays on Amazon which may work, but not sure.

I know nothing about industrial switches! Anybody know if it is possible to buy a new back half of the switch?

I looked everywhere and didn’t find one. I also looked at every part on the switch and didn’t find a way to convert to latching.

I only need it to handle 24v DC at very low amps.

 

[RPH]

Not sure if you’re going to find latching switches for this. These switches usually feed an input to a controller. The controller has logic to maintain that momentary contact. A three position rotary sector switch would function but removes the original look.

 

[RPH]

Digikey selection of maintained contacts. I can suggest you dig through the list and see if anything measures up.

 

[Slowboat]

More searching, and it looks like what I'm looking for is called the contact block. I have found some for sale, but they all seem to be momentary.

This would be an example:

https://www.grainger.com/product/EATON-Contact-Block-30-mm-Size-39R023

 

[Firebrick43]

Pretty sure you could use your current switches and contactors and put a potentiometer hidden in the box some where in line with each switch and use both switches/pots in parallel with each other on the 0-10v input.

You would then adjust the pots to set the speed where you want.

Nix that, according to the L510 manual inputs S3 and S4 will work for preset speeds

PDF page 24 or manual page number 3-9

https://www.tecowestinghouse.com/Manuals/L510_startup_manual.pdf

 

[walta]

You could add a latching circuit like the a latching and use the switch you have.

Walta

 

[whateg01]

You could add a latching circuit like the attached and use the switch you have.
...
Walta

That's what I was going to suggest!

 

[PCustoms]

That's what I was going to suggest!

Ditto

 

[mm08822]

Way, way too complicated!!. Contact blocks are momentary. It is the operator (the part you touch/sticks through the enclosure) that you need as maintained positions.

A 3-position maintained selector switch is what you need. Position 1 = Speed 1, Position 2 = Stop, Position 3 = Speed 2. Two N.O. contact blocks should work with the 3-position selector switch.

 

[mm08822]

Digikey selection of maintained contacts. I can suggest you dig through the list and see if anything measures up.

The operator is what is maintained, not the contact block. NEVER, EVER, EVER USE AN E-STOP PB FOR ANY OTHER PURPOSE!!!!!!!