New mini mill conversion.

[chucktilbury]

I have a LittleMachineShop 3990 (Sieg X2) mini mill that I am converting. I purchased a 4213 CNC spindle controller from them that converts it to VFD. My problem is that I don't know how to map the signals on the MASSO to the signals on the VFD. The schematic provided with the 4213 shows a 0-10V DC signal, which is clear enough. It also shows a NC (to ground) "start" signal and a NO (also to ground) "forward/reverse" signal. I think these are TTL level signals, though that is not specified in the doc I was provided. Looking at the actual board, there are no optos on any of these inputs.

Looking at the MASSO docs, it looks like I can probably use pin 2 for the direction control, since TTL "low" is current sinking to ground, so that should work.

I don't see anything to use for a "start" signal. I am thinking this would be the same as an "enable" signal. Looking at the F1 setup screen, I don't see an option that looks like it will do that. Anyone have an idea?

Also, I have the following values in the spindle dialog:
Encoder = 100 (there is no encoder, so I don't think this matters)
VFD = checked
Max RPM = 2500 (this is the advertised max speed)
Spin up time = 5 mS (I would set this to zero as I don't think this needs a spin up time)
Spin down time = 0 mS

Any help is appreciated.

Here is a link to the docs for the VFD add-on: https://littlemachineshop.com/images/gallery/instructions/4213CNCSpindleControlUpgradeKit.pdf
The schematic I am referring to is on page 6.

 

[chucktilbury]

Ya know.... After taking another look at everything. The spindle off/on is probably handled by changing the V on the 0-10V line and the "start" signal is probably used for ESTOP to disable the spindle.

Does that make sense?

 

[chucktilbury]

Well... This is moderately embarrassing. I figured it out. I was correct in my reply to myself. It works perfectly, just as I described.

 

[machinedude]

nothing to be embarrassed over. usually you end up getting things straight sooner or later with some time. glad you got it sorted out.

 

[testyourdesign]

I wouldn't assume uts a TTL signal. Some have internal voltage that it higher. Ask LMS for more details. Masso outputs are not isolated so you could damage it of they use different voltage.

Cheers, Stephen Brown