On 10/2/26 12:18, maurice e heskett wrote:
On 10/2/26 11:33, Viesturs Lācis wrote:
Hello!
I have a VFD that I can nicely start and stop with an output from 7i84
board, but customer does not like the fact that I replicated original
solution of setting spindle speed with potentiometer. They want to do
that from g-code so that it is consistent and not a subject for
operator to mess up. Unfortunately all analog outputs on 7i33 board
are already used for servodrives so I would prefer avoiding adding
more boards.
It is Invertek Optidrive E3 VFD and I have usb-to-rs485 converter.
lsusb shows it as CH340 chip. With some other commands I was able to
determine that it is using ttyUSB0 port.
Here is the section of Optidrive E3 manual that describes the modbus
message contents:
https://ibb.co/PzFsq8fP
And according to manual I can still have start/stop signal the way I
have now even when the drive is in Modbus mode so what I would need is
to send the frequency value (optionally - read actual frequency to
determine "spindle-at-speed" and "spindle-is-stopped"):
https://ibb.co/PGXK2gW5
I tried searching web of how to start and went for mb2hal route.
In HAL file I have:
loadusr -W mb2hal config=mb2hal.ini
Here is contents of mb2hal.ini file:
https://pastebin.com/h9qHcPR1
I tried looking at pins of mb2hal component in HalShow but the only
thing that was changing was a pin that shows number of errors.
mb2hal.ini file has 2 entries about debug messages but I did not even
understand where to find them so at the moment I have exactly no idea
what is wrong and how to proceed so I would appreciate if someone
could hold my hand and then gently poke in correct direction. It seems
like a basic thing of what people are doing with VFDs over modbus but
I have never done that.
Viesturs
The only suggestion & probably way out in left field that I'll make is
to use a analog numerical output pin to control a mesa spinx1. I'm
using one to drive my sheldon's vfd. The only other vfd is on my 6040
gantry & it makes use of the spindle output of a 7i76d, which is
direct up to 24k revs. Modbus I'll have to plead no knowledge of.
There s/b today, ready made solutions, probably USB fed. PCW probably
has something.
I should expand on the HOW since the 7i90HD interface has no analog
outputs. I use a variable duration pulse at a high enough frequency
(around 50 to 100 khz) that the spinx1 removes by filtering so its
output to the vfd's 0-10 volt input is a smooth analog voltage that has
a 10 millisecond settling time. Its fairly fast, meaning starts & stops
have a definite "thump". Running speed changes are silent, CSS cuts are
smooth & quietly done.
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