On 2 August 2010 05:49, Jon Elson el...@pico-systems.com wrote:
Well, if you made tiny jogs in each direction, small enough so that they
didn't cause a following error, then the servo amp would go live and all
would be fine.
You _could_ do it explicitly in the HAL file, before the pins are
Andy Pugh wrote:
On 2 August 2010 05:49, Jon Elson el...@pico-systems.com wrote:
Well, if you made tiny jogs in each direction, small enough so that they
didn't cause a following error, then the servo amp would go live and all
would be fine.
You _could_ do it explicitly in the HAL
: [Emc-users] Use of Pico Systems PWM servo amp with Mesa 5i20
controller
On Sat, 2010-07-31 at 23:15 -0500, Jon Elson wrote:
I know a number of people are using my PWM servo amps with Mesa
controller boards.
A feature of the dumb control logic on the servo amp is that it needs a
short pulse
Kirk Wallace wrote:
Is this the high side bootstrap that creates the high side FET gate
control voltage?
No, not really. That may be where John Kasunich got the name to call it
the bootstrap
parameter of the driver (I didn't supply that name to him). These servo
amps do have such a bootstrap
Gene Heskett wrote:
By normal fab techniques, there is not a P type FET, they all need a +
signal on the gate to turn them on. That said, a separate + and - 5 volt
supply winding whose center tap rail is common to the FET's source rail is
the much preferred method of deriving the high
I used these in the past along with some IRFZ44N
http://www.irf.com/product-info/datasheets/data/irf4905.pdf
Regards,
Alex
On 8/1/2010 8:27 PM, Jon Elson wrote:
Kirk Wallace wrote:
Is this the high side bootstrap that creates the high side FET gate
control voltage?
No, not
Peter C. Wallace wrote:
Yes, this is the high side gate supply voltage.
Well, no, despite the name, it actually has nothing to do with the
bootstrap supply.
Our amps DO, indeed, have such a supply. But, this one pulse each way
thing is needed to clear the shutdown latch in the IR FET driver
Alex Joni wrote:
I used these in the past along with some IRFZ44N
http://www.irf.com/product-info/datasheets/data/irf4905.pdf
This is a 55 V transistor. At 200 V they are at least unobtainable at
reasonable cost.
Jon
On Sunday, August 01, 2010 05:19:09 pm Jon Elson did opine:
Gene Heskett wrote:
By normal fab techniques, there is not a P type FET, they all need a +
signal on the gate to turn them on. That said, a separate + and - 5
volt supply winding whose center tap rail is common to the FET's
On Sunday, August 01, 2010 05:40:41 pm Alex Joni did opine:
I used these in the past along with some IRFZ44N
http://www.irf.com/product-info/datasheets/data/irf4905.pdf
Wow Alex, I obviously need to update my library, that looks like a quite
decent P channel device.
[...]
--
Cheers, Gene
On 1 August 2010 18:44, Jon Elson el...@pico-systems.com wrote:
Our amps DO, indeed, have such a supply. But, this one pulse each way
thing is needed to clear the shutdown latch in the IR FET driver chip.
Would setting the direction to be opposite to the home direction in
the HAL suffice?
ie,
On 8/2/2010 2:06 AM, Andy Pugh wrote:
On 1 August 2010 18:44, Jon Elsonel...@pico-systems.com wrote:
Our amps DO, indeed, have such a supply. But, this one pulse each way
thing is needed to clear the shutdown latch in the IR FET driver chip.
Would setting the direction to be
Andy Pugh wrote:
On 1 August 2010 18:44, Jon Elson el...@pico-systems.com wrote:
Our amps DO, indeed, have such a supply. But, this one pulse each way
thing is needed to clear the shutdown latch in the IR FET driver chip.
Would setting the direction to be opposite to the home
Alex Joni wrote:
That means you can't jog before homing...
Well, if you made tiny jogs in each direction, small enough so that they
didn't cause a following error, then the servo amp would go live and all
would be fine. That's why I put this in the driver so it just got done
immediately
I know a number of people are using my PWM servo amps with Mesa
controller boards.
A feature of the dumb control logic on the servo amp is that it needs a
short pulse in each direction
to clear the shutdown latches on the FET driver chips. I built a little
state machine into the driver to
On Sat, 2010-07-31 at 23:15 -0500, Jon Elson wrote:
I know a number of people are using my PWM servo amps with Mesa
controller boards.
A feature of the dumb control logic on the servo amp is that it needs a
short pulse in each direction
to clear the shutdown latches on the FET driver chips.
On Sunday, August 01, 2010 12:56:35 am Kirk Wallace did opine:
On Sat, 2010-07-31 at 23:15 -0500, Jon Elson wrote:
I know a number of people are using my PWM servo amps with Mesa
controller boards.
A feature of the dumb control logic on the servo amp is that it needs
a short pulse in
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