On Thu, 2012-02-02 at 22:21 -0500, gene heskett wrote:
what can he use for an exciting signal?
It seems I'm missing something obvious. I thought the idea was to move
the motor back forth while comparing the commanded (presumably, the
actual) position with the encoder's (also, presumably, the
: [Emc-users] US Digital encoders?
2012/2/2 andy pugh bodge...@gmail.com:
On 2 February 2012 15:09, Viesturs L??cis viesturs.la...@gmail.com wrote:
Could it be anything else, but the encoder problem?
It could be an unfortunate resonance between the mechanical frequency
of the machine frame
2012/2/3 Peter C. Wallace p...@mesanet.com:
Is it possible that you have some binding or tracking issues? The 7I39L has
a current limit of 15A/phase If you exceed ths current, you will suddenly
have a drastic change in your tuning as you will lose the inherent damping
of a voltage mode drive.
On Friday, February 03, 2012 10:33:35 PM Ed Nisley did opine:
On Thu, 2012-02-02 at 22:21 -0500, gene heskett wrote:
what can he use for an exciting signal?
It seems I'm missing something obvious. I thought the idea was to move
the motor back forth while comparing the commanded
2012/1/31 Peter C. Wallace p...@mesanet.com:
This can be mitigated by putting a common mode choke (Big
ferrite bead) over the three motor leads (DO NOT include the ground lead)
1) I wrapped each of 3 power wires for motor around a separate ferrite bead.
2) I connected machine frame to common
On Thursday, February 02, 2012 08:51:35 AM Viesturs Lācis did opine:
2012/1/31 Peter C. Wallace p...@mesanet.com:
This can be mitigated by putting a common mode choke (Big
ferrite bead) over the three motor leads (DO NOT include the ground
lead)
1) I wrapped each of 3 power wires
On 2 February 2012 15:09, Viesturs Lācis viesturs.la...@gmail.com wrote:
Could it be anything else, but the encoder problem?
It could be an unfortunate resonance between the mechanical frequency
of the machine frame and the servo loop. This might be why increasing
the servo frequency was
2012/2/2 Viesturs Lācis viesturs.la...@gmail.com
...
So my conclusion is - machine is not losing encoder counts, there is
no significant noise in encoder signal.
Could it be anything else, but the encoder problem?
...
Did you try my suggestion to ground the encoder, as written in my
2012/2/2 andy pugh bodge...@gmail.com:
On 2 February 2012 15:09, Viesturs Lācis viesturs.la...@gmail.com wrote:
Could it be anything else, but the encoder problem?
It could be an unfortunate resonance between the mechanical frequency
of the machine frame and the servo loop. This might be why
On Thu, 2012-02-02 at 09:36 -0500, gene heskett wrote:
that would require a function generator
Perhaps gimmicking up a HAL circuit with siggen or freqgen to drive the
stepper, then compare the encoder input with the motor output? You
probably don't need a sine wave, just drive the motor back
On Thursday, February 02, 2012 10:20:56 PM Ed Nisley did opine:
On Thu, 2012-02-02 at 09:36 -0500, gene heskett wrote:
that would require a function generator
Perhaps gimmicking up a HAL circuit with siggen or freqgen to drive the
stepper, then compare the encoder input with the motor
On 30 January 2012 22:33, Viesturs Lācis viesturs.la...@gmail.com wrote:
2012/1/30 Peter C. Wallace p...@mesanet.com:
Before you change encoders, and noting that others have used the CUI/AMT
encoders with success, can you try a little experiment to make sure this
is
not a noise --
2012/1/31 Tom Easterday tom-...@bgp.nu:
Do you have differential drivers for the encoders or are you running them
single ended?
Single ended.
I would put the encoder signals on an oscilloscope and see what they look
like to the controller.
Since I do not have oscilloscope, it seems like
: Re: [Emc-users] US Digital encoders?
2012/1/31 Tom Easterday tom-...@bgp.nu:
Do you have differential drivers for the encoders or are you running them
single ended?
Single ended.
I would put the encoder signals on an oscilloscope and see what they look like
to the controller.
Since I do
2012/1/31 Peter C. Wallace p...@mesanet.com:
The three phase PWM is a fair noise source. Not just capacitively coupled
noise from the three motor wires but inductively coupled noise due to
current spikes from the 28V PWM driving into the motors winding/frame
capacitance. This can be mitigated
2012/1/31 Viesturs Lācis viesturs.la...@gmail.com
2012/1/31 Peter C. Wallace p...@mesanet.com:
The three phase PWM is a fair noise source. Not just capacitively coupled
noise from the three motor wires but inductively coupled noise due to
current spikes from the 28V PWM driving into the
2012/2/1 Sven Wesley svenne.d...@gmail.com
I'm jumping in here, without reading the entire discussion, but you need
to ground the encoder housing as well. The Ethernet ground is not connected
to the chassi of the encoder. I have been using AMT's for years with great
success but had a tiny but
I would like to ask, if anyone could provide some recommendations for
US Digital encoders - I chose them, because they seem to be next in
the line in terms of affordability.
I was particularly looking at E7P.
I have Keling KL23BLS_115 Nema 23 servo motors:
Subject: [Emc-users] US Digital encoders?
Hello!
The conclusion of my struggle with tuning servo motors is that I shall
change encoders. I based it on Jon's findings, when testing AMT 102
encoders and I also got a feedback from a local guy, who also had used
them on a cnc machine.
Sorry, Peter, I
Subject: [Emc-users] US Digital encoders?
Hello!
The conclusion of my struggle with tuning servo motors is that I shall
change encoders. I based it on Jon's findings, when testing AMT 102
encoders and I also got a feedback from a local guy, who also had used
them on a cnc machine.
Sorry, Peter, I
Viesturs Lācis wrote:
I would like to ask, if anyone could provide some recommendations for
US Digital encoders - I chose them, because they seem to be next in
the line in terms of affordability.
US Digital may not be the greatest. At least, at one time, you had to
add capacitors
to the
2012/1/30 Peter C. Wallace p...@mesanet.com:
Before you change encoders, and noting that others have used the CUI/AMT
encoders with success, can you try a little experiment to make sure this is
not a noise -- losing count/commutation issue?
Thank You for the explanation! I really appreciate
Subject: Re: [Emc-users] US Digital encoders?
2012/1/30 Peter C. Wallace p...@mesanet.com:
Before you change encoders, and noting that others have used the CUI/AMT
encoders with success, can you try a little experiment to make sure this is
not a noise -- losing count/commutation issue?
Thank You
2012/1/30 Peter C. Wallace p...@mesanet.com:
I am suggesting this test because if there is a noise problem, different
encoders may not help.
Of course, I totally agree, but I just did not see a reason for noise by now.
A possible noise source is the PWM signals. This can
couple into the
On Jan 30, 2012, at 3:56 PM, Viesturs Lācis wrote:
2012/1/30 Peter C. Wallace p...@mesanet.com:
I am suggesting this test because if there is a noise problem, different
encoders may not help.
Of course, I totally agree, but I just did not see a reason for noise by now.
A possible noise
are you using the ttl - differential converter/transmitters that you
can get for the CUI/AMT encoders? (they are $10 US) we had issues with
ttl encoders above about 15ft. (shielded cable) We have used them on our
conversion and they work great (even for non cui/amt encoders)
sam
On 01/30/2012
On Mon, 30 Jan 2012 11:22:36 -0600
Jon Elson el...@pico-systems.com wrote:
Viesturs Lācis wrote:
I would like to ask, if anyone could provide some recommendations
for US Digital encoders - I chose them, because they seem to be
next in the line in terms of affordability.
US Digital
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