Kirk Wallace wrote:
On Mon, 2008-06-09 at 20:24 -0500, Jon Elson wrote:
... snip
I have another test. Try running the system exactly as it is
when the inductors overheat, but with the motor disconnected.
If it still overheats, you can remove C14 and C15 (right near
the power connector).
Kirk Wallace wrote:
Removing C14 and C15 stopped the inductor heating without affecting
anything else, as far as I could tell. I wonder if smaller caps or a
different core type might help.
Excellent! Well, these are 47 uH 15 A inductors, and pretty
amazing at that size. I have found
Jon Elson wrote:
Kirk Wallace wrote:
On Sun, 2008-06-08 at 01:21 -0500, Jon Elson wrote:
... snip
Your last order of servo amps may be included in this batch.
If the power transistors say FB260 on them, they need the fix.
If they say 31N20D then they don't.
Jon
My amps have FB260's. Should
On Mon, 2008-06-09 at 20:24 -0500, Jon Elson wrote:
... snip
I have another test. Try running the system exactly as it is
when the inductors overheat, but with the motor disconnected.
If it still overheats, you can remove C14 and C15 (right near
the power connector). These are the
On Mon, 2008-06-09 at 20:17 -0700, Kirk Wallace wrote:
On Mon, 2008-06-09 at 20:24 -0500, Jon Elson wrote:
... snip
I have another test. Try running the system exactly as it is
when the inductors overheat, but with the motor disconnected.
If it still overheats, you can remove C14 and
Kirk Wallace wrote:
On Sat, 2008-06-07 at 13:06 -0500, Jon Elson wrote:
...snip
would put the PWM duty cycle at 50%, the worst case. What is
your DC supply voltage?
Jon
53 VDC unregulated with 500 uF of filter caps. So far the motor has had
no load. If you need more information let
That should have read re-tuned the DEAD time
Jon
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Jeff Epler wrote:
Jon,
What *should* the driving signals look like at the input of your
amplifiers? I assume from your response that I'm making some kind of
rookie mistake here, compounded by the fact that I still don't
understand what the mistake is.
No, maybe not.
My amps were designed
Kirk Wallace wrote:
I can certainly try, but I am using the latest 2.2.5 which should be
fixed. I have pwmdir set true. I measured only logic levels on the dir
pin and analog on the PWM pin. The no load forward and reverse RPM
through the range (0 to 5500) was within 50 RPM.
OK, not a
Kirk Wallace wrote:
These are a little embarrassing, but here are some pictures of my
Pico/Pluto setup:
http://www.wallacecompany.com/machine_shop/Pluto/
The cores of the inductors seem to be heating and not the copper, so it
takes a while for the heat to be detected. It seems that one
At 06:13 PM 6/7/2008, you wrote:
On Sat, 2008-06-07 at 13:32 -0700, Kirk Wallace wrote:
... snip
I can certainly try, but I am using the latest 2.2.5 which should be
fixed. I have pwmdir set true. I measured only logic levels on the dir
pin and analog on the PWM pin. The no load forward and
On Sun, 2008-06-08 at 01:21 -0500, Jon Elson wrote:
... snip
Your last order of servo amps may be included in this batch.
If the power transistors say FB260 on them, they need the fix.
If they say 31N20D then they don't.
Jon
My amps have FB260's. Should I put some caps on them?
--
Kirk
Kirk Wallace wrote:
On Sun, 2008-06-08 at 01:21 -0500, Jon Elson wrote:
... snip
Your last order of servo amps may be included in this batch.
If the power transistors say FB260 on them, they need the fix.
If they say 31N20D then they don't.
Jon
My amps have FB260's. Should I put some
When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
call sign-magnitude:
value after scale+offsetPWM Dir
0.0 0%FALSE
0.5 50%FALSE
1.0100%* FALSE
Kirk Wallace wrote:
I haven't looked at the control signals with a scope. One inductor was
much hotter than the other. I assumed because it was because I was
driving the motor mostly one direction. I was planning on using 110
Volts for the motor supply.
Hmm, synchronous antiphase would
Jeff Epler wrote:
When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
call sign-magnitude:
value after scale+offsetPWM Dir
0.0 0%FALSE
0.5 50%FALSE
1.0
On Sat, 2008-06-07 at 13:06 -0500, Jon Elson wrote:
...snip
would put the PWM duty cycle at 50%, the worst case. What is
your DC supply voltage?
Jon
53 VDC unregulated with 500 uF of filter caps. So far the motor has had
no load. If you need more information let me know. If you want, I
Jon,
What *should* the driving signals look like at the input of your
amplifiers? I assume from your response that I'm making some kind of
rookie mistake here, compounded by the fact that I still don't
understand what the mistake is.
Jeff
On Sat, 2008-06-07 at 13:24 -0500, Jon Elson wrote:
Jeff Epler wrote:
When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you
call sign-magnitude:
value after scale+offsetPWM Dir
0.0 0%FALSE
0.5
don't feel bad :)
http://www.electronicsam.com/images/KandT/servostart/ampmess.JPG
sam
- Original Message -
From: Kirk Wallace [EMAIL PROTECTED]
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Sent: Saturday, June 07, 2008 5:13 PM
Subject: Re: [Emc-users] Pico
I received a Pluto today and started playing with it. Thanks to some
help from the IRC (Thank you Skunkworks) I got the driver to load using
LPT1 (378). Although, it loads without the apparent fix (epp_wide=0) now
too. The driver and EMC loads with my PCI parport card, but it it
doesn't respond to
On Fri, 2008-06-06 at 22:31 -0400, Stephen Wille Padnos wrote:
Check to see if the parameter pluto.whatever.pwm.is-pdm is set. If
so, try clearing that bit. That sets PDM or Interleaved PWM mode,
which operates similarly to a step generator - it outputs as high a
frequency as possible, to
Kirk Wallace wrote:
I received a Pluto today and started playing with it. Thanks to some
help from the IRC (Thank you Skunkworks) I got the driver to load using
LPT1 (378). Although, it loads without the apparent fix (epp_wide=0) now
too. The driver and EMC loads with my PCI parport card, but
On Fri, 2008-06-06 at 23:32 -0500, Jon Elson wrote:
... snip
My guess is the Pluto is using synchronous antiphase modulation,
where the bridge is switching the transistors on 50% of the time
at idle. This provides full DC supply voltage across the
inductor at the PWM frequency, and heating
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