MESA 7i76 - Lenze VFD: Where are the 10V

Hi, I my name is Chrstian and I tend to read more on forums than to write. But as many others I am in some kind of a dead end and could use some advice...

Backstory:
I bought an used self build CNC Router. The controls were build around an USB Smooth Stepper and Mach3. Since the controls are not repair friendly (too much stuff packed in too little space with custom layout boards and same color wires) and I am more a Linux than a Windows guy, I am in the process to upgrade to LinuxCNC.

I use an 7i92 and an 7i76

One of the last steps missing is the spindle control (1,5kw china spindle with ER16). For some reason the person, who built the router went with an "Lenze 822MV" 400V 2,2kw VFD.

After the long introduction, my question:
Where can I get my 10V reference (Spindle +) from this VFD? If someone might take a look and give me a hint, I would appreciate it.

The manual for the "Application IO Module" that is used, can be found here: www.becker-antriebstechnik.org/WebRoot/H...__v6-0__DE_EN_FR.pdf
(page 21 starts the english description)

The manual for the actual VFD (should not matter that much, just in case):https://www.lenze.com/en-de/products/inverters/previous-products-inverters/8200-motec

Currently connections A1, 2x7 (GND), 59, 28 and 2U are connected. I have absolutely no Idea where they go to...

In case the VFD does not have an 10V reference voltage, what are my options? Do the cheap 20€ 4channel 2,5V, 5V, 7.5V, 10V reference voltage things from ebay work?
Am I missing something?

Thanks in advance for the help (and all the help I got from the forum without having to ask).

Christian aka TheRealMable

Looks like the VFD (or I/O module) does not supply 10V, but it does
supply 5V and you can set the input to accept 0 to 5V instead of 0 to 10V

7I76           Drive

SPIN+        9      (+5V)
SPINOUT    1U    (VIN)
SPIN-          7      (GND)


My guess on the others is that:

28 is drive-on  (wire +24 to 7I76 ENA+ and 7I76 ENA- to 28)
59 is +12 to +24V power (same as 7I76 field power)
7 is GND (same as 7I76 field power GND)
A1 is an output (wire to a 7I76 field input)
Might be a fault or at-speed indication, need to look at
the drive settings to know.

2U is another analog input, no real idea what this was doing
but if you look at the current drive settings, it may give you a clue.



 

Thanks for the quick answer, a little bit busy at work, so I am somewhat slow.

My problem with that 5V Output was, that it, oddly specific, says 5.2V. Since the documentation mentions that the inputs U1, U2 have 1% error (when using 0-5V), I thought 5% more voltage is a lot...

The specs mention, that the "resistance of the input" needs to be above 1k. I could not find any specifics in the Mesa manual regarding that, but the "SPINOUT" should be high enough impedance?

BTW, I have no Idea why he is using 2U, instead of 1U. The two inputs seem to be equal. A1 seems to be a fault indicator, as far as I undestand.

The 5.2V is not really an issue as you can scale (and bound) the analog output
so you get 0 to 5V at 0 to full RPM.

 

After some trial and error, I got it kind of working.

The wiring:
SPIN+ 9
SPINOUT 1U
SPIN- 7 and GND (you need to pass GND from your Field Power to 7 at the application I/O Modul)
ENA+ VField (+24V)
ENA- 28
DIR+ VField (+24V)
DIR- E4 (digital Input, reverses spindle direction if "HIGH")

cave: the application I/O has two Inputs labeled "7". They both need to be connected to GND (they are not connected internally, so you need to bridge them).

The only Problem I have left is the scaling. As far as I understand it works like this:

"hm2_7i92.0.7i76.0.0.spinout-minlim" is set to the minimum RPM I want to allow linuxcnc to pass to the VFD. In my case I set it at 6000 (any slower and the spindle tends to stall)

hm2_7i92.0.7i76.0.0.spinout-maxlim same as "minlim" but with maximum RPM. I set it at 24000, so everything above S24000 is ignored/capped at s24000

hm2_7i92.0.7i76.0.0.spinout-scalemax the theoretical RPM call, that would tell the MESA card to pass the full SPIN+ Voltage to SPOUT.

So I set it to (5,2/5)*24000 = 24960. That does not seem to work too accurate. If I plot the set Speed (via S... command) and the frequency at the VFD, I get something that I would call "good enough for my hobby", but "wrong" enough to question my understandig of "spinout-scalemax".

I will try to post the graph I get in a separate reply. Are my thoughts on the scaling correct that far, or is there an error in my settings?