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 n
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 conn
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
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 capa
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
>>
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. Sh
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?
--
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 forwa
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 t
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
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 designe
That should have read "re-tuned the DEAD time"
Jon
-
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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 inf
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)"
Sent: Saturday, June 07, 2008 5:13 PM
Subject: Re: [Emc-users]
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 reverse RPM
> through the range (0
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
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 13:06 -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
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
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 woul
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
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 heat
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, b
On Fri, 2008-06-06 at 22:31 -0400, Stephen Wille Padnos wrote:
> Check to see if the parameter "pluto..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
Check to see if the parameter "pluto..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 make it easier to average / filter (so you
don't need huge caps). Qui
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
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