Access or read amperage going to the motors

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07 Apr 2021 23:14 #205294 by andypugh
Unless you are using "VFD" to mean "Servo Drive"?

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08 Apr 2021 11:19 #205317 by bierluiz
It is a Fanuc AC servo motor Model 5 (A06B-0512-B)

The driver is model A20B-1001-0770. Specs are attached.

The machine is a Cincinnati Milacron Sabre 500.

Is there a way to tell if it is a VFD or not? From the documentation I have, it says "VFD"
Attachments:

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09 Apr 2021 10:18 #205415 by andypugh
Well, I suppose that all AC servo drives are also Variable Frequency Drives, because they are drives and work at variable frequency.

But VFD has come to be used mainly for drives where the primary control is via frequency, whereas most AC servo drives control the current and the frequency is set by the motor speed via the commutation feedback.

Anyway, with that clarified.

In the HAL there is likely to be a PID for each axis, the output of which goes to the Motenc DAC. That PID output pin will offer an approximate measure of motor load.
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09 Apr 2021 10:44 #205418 by bierluiz
Thank you so much, that made things more clear to me.

One last question though, sorry for the repetition, but can't I see the connection from the Motenc to the driver in HAL? Why they don't show in Hal show?

Or they are there, but I have to create the pins and signals to be able to monitor them?

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09 Apr 2021 10:47 #205419 by andypugh
Can you attach your HAL file(s)? I haven't seen enough Motenc configs to be able to guess the pin names.

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09 Apr 2021 11:22 - 17 Apr 2021 21:48 #205422 by bierluiz
Last edit: 17 Apr 2021 21:48 by bierluiz.

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09 Apr 2021 11:35 #205423 by andypugh
The links are here:

core_servo.hal
# create PID to DAC output signals
net Xoutput <= pid.0.output
net Youtput <= pid.1.output
net Zoutput <= pid.2.output
#net Soutput <= pid.4.output


and


motenc_motion.hal
# Connect PID output signals to DACs.
linksp Xoutput => motenc.0.dac-00-value
linksp Youtput => motenc.0.dac-01-value
linksp Zoutput => motenc.0.dac-02-value
#linksp Moutput => motenc.1.dac-00-value


The same signal names are shared throughout the HAL, so can be used in multiple files.
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09 Apr 2021 11:37 #205424 by andypugh
Note that "linksp" is a somewhat outdated command. "net" does almost exactly the same thing but does not require "newsig" to create the signal.
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