7i76e spindle control show strange behavior

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10 years 9 months ago #68191 by newbynobi
7i76e spindle control show strange behavior was created by newbynobi
Hallo,

so I recieved my 7i76e, like others without a name set on the card. I solved this and I am now fighting with the spindle control.

My VFD needs 0-10 V and dir signal, so it should not be a problem.

I connected
+12 V to TB4 Pin 3
- 12 V to TB4 Pin 1

my INI looks like this:
Code:
[SPINDLE_9] P = 1.0 I = 0.0 D = 0.0 FF0 = 1.0 FF1 = 0.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 6000.0 OUTPUT_SCALE = 7200.0 OUTPUT_MIN_LIMIT = -6000.0 OUTPUT_MAX_LIMIT = 6000.0

and this is the hal part:
Code:
#******************* # SPINDLE S #******************* setp pid.s.Pgain [SPINDLE_9]P setp pid.s.Igain [SPINDLE_9]I setp pid.s.Dgain [SPINDLE_9]D setp pid.s.bias [SPINDLE_9]BIAS setp pid.s.FF0 [SPINDLE_9]FF0 setp pid.s.FF1 [SPINDLE_9]FF1 setp pid.s.FF2 [SPINDLE_9]FF2 setp pid.s.deadband [SPINDLE_9]DEADBAND setp pid.s.maxoutput [SPINDLE_9]MAX_OUTPUT setp pid.s.error-previous-target true setp pid.s.maxerror 5 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 # ---digital potentionmeter output signals/setup--- setp hm2_7i76e.0.7i76.0.0.spinout-minlim [SPINDLE_9]OUTPUT_MIN_LIMIT setp hm2_7i76e.0.7i76.0.0.spinout-maxlim [SPINDLE_9]OUTPUT_MAX_LIMIT setp hm2_7i76e.0.7i76.0.0.spinout-scalemax [SPINDLE_9]OUTPUT_SCALE net spindle-vel-cmd-rpm => hm2_7i76e.0.7i76.0.0.spinout net spindle-enable => hm2_7i76e.0.7i76.0.0.spinena net spindle-ccw => hm2_7i76e.0.7i76.0.0.spindir # ---setup spindle control signals--- net spindle-vel-cmd-rps <= motion.spindle-speed-out-rps net spindle-vel-cmd-rps-abs <= motion.spindle-speed-out-rps-abs net spindle-vel-cmd-rpm <= motion.spindle-speed-out net spindle-vel-cmd-rpm-abs <= motion.spindle-speed-out-abs net spindle-enable <= motion.spindle-on net spindle-cw <= motion.spindle-forward net spindle-ccw <= motion.spindle-reverse net spindle-brake <= motion.spindle-brake net spindle-revs => motion.spindle-revs net spindle-at-speed => motion.spindle-at-speed net spindle-vel-fb-rps => motion.spindle-speed-in net spindle-index-enable <=> motion.spindle-index-enable # ---Setup spindle at speed signals--- sets spindle-at-speed true

As you can see, I use a scale of 7200 to archive that max speed of 6000 rpm is reached with 10 V,

So here comes the wonder:
S3000 M3 gives 5.02 V on TB3 Pin 2
S3000 M4 gives 7.04 V on TB3 Pin 2

S1000 M3 gives 1.67 V on TB3 Pin 2
S1000 M4 gives 10.5 V on TB3 Pin 2

Enable and Dir are working as they should.

If I change the scale to be 6000, it results in:

S3000 M3 gives 6.03 V on TB3 Pin 2
S3000 M4 gives 6.03 V on TB3 Pin 2

S1000 M3 gives 2.00 V on TB3 Pin 2
S1000 M4 gives 10.1 V on TB3 Pin 2

Is there a way to set a separate scale for counterclockwise spindle dir?

Norbert

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10 years 9 months ago #68192 by newbynobi
Replied by newbynobi on topic 7i76e spindle control show strange behavior
Got it!!!

Must be:
line:
net spindle-vel-cmd-rpm => hm2_7i76e.0.7i76.0.0.spinout
net spindle-vel-cmd-rpm-abs => hm2_7i76e.0.7i76.0.0.spinout

As this connections has been made with pncconf, i consider it as a bug, I will inform Chris.

Norbert

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10 years 9 months ago #68216 by cmorley
Replied by cmorley on topic 7i76e spindle control show strange behavior
So yes there is a box missing in master to select a positive only output - i will fix soon.

As for the scaling:
an output_scale of 7200 means if linuxcnc requests 7200 RPM, that the output would be 10 volts
to limit the speed to 6000 you would need to limit the output voltage to less then 10 volts.
But you mention that you want the motor to spin at 6000rpm at 10 volts.
So you must pick one or the other :)

OUTPUT_SCALE = 6000
OUTPUT_MIN_LIMIT = 0
OUTPUT_MAX_LIMIT = 6000

would give you 0 - 10volt output for a 0 to 6000 rpm request

OUTPUT_SCALE = 7200
OUTPUT_MIN_LIMIT = 0
OUTPUT_MAX_LIMIT = 6000

would give you 0 - 8.3 volt output for a 0 to 6000 rpm request

Chris M

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10 years 9 months ago #68321 by newbynobi
Replied by newbynobi on topic 7i76e spindle control show strange behavior
Hallo Chris,

My spindle turns from -6000 to 6000 rpm, as it can run cw and ccw.
I do feed the 7i76e with 12V, but my vfd needs 0 to 10 V. That is the reason for the scale, as otherwise the vfd may be feeded with 12 V!!!

My vfd would accept also values from -10V to +10V for velocity control, but 7i76e potentiometer does not allow that configuration.

I also see, there is a limitation in speed using pncconf of 100 mm/min, my machine is able to do 10000 mm/min. I did set x axis limits to min=0 and max=300 in pncconf, but the ini values has been set by pncconf to 0 and 30000, so there is also something wrong.

There was also a strange scale calculation, but i will report that bug sepately, as i am not on my computer now and have to check first what i did to reproduce it.

Norbert

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10 years 9 months ago #68323 by andypugh
Replied by andypugh on topic 7i76e spindle control show strange behavior

newbynobi wrote: My spindle turns from -6000 to 6000 rpm, as it can run cw and ccw.
I do feed the 7i76e with 12V, but my vfd needs 0 to 10 V. That is the reason for the scale, as otherwise the vfd may be feeded with 12 V!!!


I _think_ that the 7i76 spindle output is a digital potentiometer, and the max output is whatever voltage the _VFD_ supplies to it.

So, you should not need a scale factor.

Furthemore, the 7i77 servo outputs are +/- 10V, independent of field power voltage.

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10 years 9 months ago #68325 by newbynobi
Replied by newbynobi on topic 7i76e spindle control show strange behavior
Andy, you are right!

I just have a 12V power supply for other purpose and used that one for testing.
But I do not want to buy a additional 7i77, so I will use the dir pin to switch a relay to change the direction.


Norbert

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10 years 9 months ago #68328 by andypugh
Replied by andypugh on topic 7i76e spindle control show strange behavior

newbynobi wrote: I just have a 12V power supply for other purpose and used that one for testing.


Probably best to derive the speed control voltage from the VFD itself.

(And the 7i77 mention was just a comment, not a suggestion that a 7i77 was any use to you)

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