Again 0-10V Problem on MESA 7i97

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3 years 1 week ago #283299 by nighteagle
Again 0-10V Problem on MESA 7i97 was created by nighteagle
Hello,
i want only the simple thing to have 0-10V instead of 0 to +- 10V to drive VFD. For reverse i have to close a contact on the VFD so i use here the output OUT1 of the MESA 7i97.

So i have read here:
linuxcnc.org/docs/2.4/html/man/man9/pwmgen.9.html

And then i wonder why it is false now - because pwmgen output_type have no value "0" now.
If i use type "1" then the behaviour by using M3 positive values and by M4 negative values.

So where is the setting to prevent +-10V and have these 0-10V always positive values?
Is there something a info about this or a wiki?

My config is now:
Code:
#******************* #  SPINDLE #******************* setp   pid.s.Pgain     [SPINDLE_0]P setp   pid.s.Igain     [SPINDLE_0]I setp   pid.s.Dgain     [SPINDLE_0]D setp   pid.s.bias      [SPINDLE_0]BIAS setp   pid.s.FF0       [SPINDLE_0]FF0 setp   pid.s.FF1       [SPINDLE_0]FF1 setp   pid.s.FF2       [SPINDLE_0]FF2 setp   pid.s.deadband  [SPINDLE_0]DEADBAND setp   pid.s.maxoutput [SPINDLE_0]MAX_OUTPUT setp   pid.s.error-previous-target true net spindle-index-enable  <=> pid.s.index-enable net spindle-enable        =>  pid.s.enable net spindle-vel-cmd-rpm     => pid.s.command net spindle-vel-fb-rpm      => pid.s.feedback net spindle-output        <=  pid.s.output # ---PWM Generator signals/setup--- setp   [HMOT](CARD0).pwmgen.05.output-type 1 #PWM pin5 setp   [HMOT](CARD0).pwmgen.05.offset-mode 1 # offset mode so 50% = 0 setp   [HMOT](CARD0).pwmgen.05.scale   [SPINDLE_0]OUTPUT_SCALE net spindle-output      => [HMOT](CARD0).pwmgen.05.value net spindle-enable      => [HMOT](CARD0).pwmgen.05.enable # ---Encoder feedback signals/setup--- setp    [HMOT](CARD0).encoder.05.counter-mode 0 setp    [HMOT](CARD0).encoder.05.filter 1 setp    [HMOT](CARD0).encoder.05.index-invert 0 setp    [HMOT](CARD0).encoder.05.index-mask 0 setp    [HMOT](CARD0).encoder.05.index-mask-invert 0 setp    [HMOT](CARD0).encoder.05.scale  [SPINDLE_0]ENCODER_SCALE net spindle-revs             <=   [HMOT](CARD0).encoder.05.position net spindle-vel-fb-rps       <=   [HMOT](CARD0).encoder.05.velocity net spindle-vel-fb-rpm       <=   [HMOT](CARD0).encoder.05.velocity-rpm net spindle-index-enable     <=>  [HMOT](CARD0).encoder.05.index-enable # ---setup spindle control signals--- #Spindle Reverse set Output  OUT1 to give Signal 1 to VFD and forward 0 #net spindle-cw spindle.0.forward  =>  [HMOT](CARD0).ssr.00.out-01 net spindle-ccw spindle.0.reverse  =>  [HMOT](CARD0).ssr.00.out-01 net spindle-vel-cmd-rps        <=  spindle.0.speed-out-rps net spindle-vel-cmd-rps-abs    <=  spindle.0.speed-out-rps-abs net spindle-vel-cmd-rpm        <=  spindle.0.speed-out net spindle-vel-cmd-rpm-abs    <=  spindle.0.speed-out-abs net spindle-enable             <=  spindle.0.on net spindle-cw                 <=  spindle.0.forward #net spindle-ccw                <=  spindle.0.reverse net spindle-brake              <=  spindle.0.brake net spindle-revs               =>  spindle.0.revs net spindle-at-speed           =>  spindle.0.at-speed net spindle-vel-fb-rps         =>  spindle.0.speed-in net spindle-index-enable      <=>  spindle.0.index-enable # ---Setup spindle at speed signals--- sets spindle-at-speed true

 
Code:
[SPINDLE_0] P = 0 I = 0 D = 0 FF0 = 1 FF1 = 0 FF2 = 0 BIAS = 0 DEADBAND = 0 MAX_OUTPUT = 40000 OUTPUT_SCALE = -40000 OUTPUT_MAX_LIMIT = 40000 OUTPUT_MIN_LIMIT = 0

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3 years 1 week ago #283300 by PCW
Replied by PCW on topic Again 0-10V Problem on MESA 7i97
To get 0 to 10V you would not change any PWM settings
but rather change:

net spindle-vel-cmd-rpm => pid.s.command
to
net spindle-vel-cmd-rpm-abs => pid.s.command

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3 years 1 week ago #283306 by nighteagle
Replied by nighteagle on topic Again 0-10V Problem on MESA 7i97
Hello,
@PCW - it works! So i don't have found this simple solution.... how can somebody find something like this?

And another questions - the pwmgen type is 1 - and it means value and direction - so can i use this dir signal to enable my reverse on the VFD?

I use now this solution and i think is not the best idea:
Code:
#Spindle Reverse -> set Output OUT1 to "1" to VFD (forward set OUT1 to "0") #net spindle-cw spindle.0.forward => [HMOT](CARD0).ssr.00.out-01 net spindle-ccw spindle.0.reverse => [HMOT](CARD0).ssr.00.out-01

Better is to use the implemented DIR-PIN and link it to the output?

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3 years 1 week ago #283310 by PCW
Replied by PCW on topic Again 0-10V Problem on MESA 7i97
I think using the spindle.0 pin is fine

( The PWM DIR output is not present and even if it was, it would
never change as the PWM value is always positive )

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3 years 1 week ago #283342 by nighteagle
Replied by nighteagle on topic Again 0-10V Problem on MESA 7i97
@PCM
okay - understand now...
so my solution is not safe at all?

The default state of the Pin is false or "0" - if i linked the pin-name to the signal:
net spindle-ccw spindle.0.reverse => [HMOT](CARD0).ssr.00.out-01
the signal will set the pin on active or "1" but how do i set the opposite?

I look for something like this:

net spindle-cw spindle.0.forward => [HMOT](CARD0).ssr.00.out-01 false
net spindle-ccw spindle.0.reverse => [HMOT](CARD0).ssr.00.out-01 true

Is there some parameter/argument to give the true or false to the pin?
I will prevent the pin is in a undefined condition. So each signal set in every case the reverse pin of my VFD correct.
If only the reverse signal set the pin - it looks not safe for me!?

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3 years 1 week ago #283355 by PCW
Replied by PCW on topic Again 0-10V Problem on MESA 7i97
It depends on the function of the FWD/REV pins on your VFD.
If they are standard FWD/REV pins, (if you assert FWD, it runs forward,
if you assert REV, it runs in reverse) you need two outputs, one
for FWD and one for REV.

If you just have a direction pin, you need an additional pin (normally
called enable)

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3 years 1 week ago #283376 by nighteagle
Replied by nighteagle on topic Again 0-10V Problem on MESA 7i97
Okay - misunderstanding.

My VFD have an input and i drive it with an relay with the ouptut of the mesa-card.

If i test it with:

setp [HMOT](CARD0).ssr.00.out-01 true

Activate the relay and the contact close on the VFD and it means reverse.

setp [HMOT](CARD0).ssr.00.out-01 false

Deactivate the relay and the contact opens and VFD is on forward.

So the signal is linked on to the pin-name in my config:

net spindle-cw spindle.0.forward => [HMOT](CARD0).ssr.00.out-01

How i know the output go to true? And if i will have inverse logic and want to have a false on the output?


net spindle-cw spindle.0.forward => [HMOT](CARD0).ssr.00.out-01 false

is not working!?

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3 years 1 week ago #283538 by PCW
Replied by PCW on topic Again 0-10V Problem on MESA 7i97
I would not expect that to work as all VFD interfaces I know use two control pins,
Ether FWD/REV or DIR/ENA

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3 years 1 week ago #283588 by nighteagle
Replied by nighteagle on topic Again 0-10V Problem on MESA 7i97
My VFD (Acomel for 40.000 RPM IBAG Spindles) have one enable input and one 0-10V input and one Reverse input.
If the reverse input is closed to gnd of VFD the spindle is in reverse condition - and if the spindle was in forward then it goes down then it brakes and start again in reverse. All works fine - no Hardware problems no Hardware questions...

But this is not important to my question - i mean only the logic for the linking:

If i linked signal to pin name - what i linked here? A pin-name can not make anything it is only a name.

How can the signal set my pin-name to true and not to false?

I missing here something or misunderstanding something?

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3 years 1 week ago #283601 by PCW
Replied by PCW on topic Again 0-10V Problem on MESA 7i97
I would think you would want

net spindle-ccw spindle.0.reverse => [HMOT](CARD0).ssr.00.out-01

(if SSR 1 on means reverse)

And better still add:

net spindle-on spindle.0.on => [HMOT](CARD0).ssr.00.out-00

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