Re: Servo amp using pwm+- with mach 2
Posted by
caudlet
on 2004-06-16 14:11:44 UTC
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "callcbmf" <callcbm@d...>
wrote:
(or it appears motor current optionally) to get velocity feedback.
The commanded velocity from the computer is compared to the motor
velocity for speed. The Amps need a +/- 10VDC control voltage input.
I will have to defer to someone else in the next part and that has to
do with positional feedback. I don't know if the three hall sensors
can be used like an encoder or just for commutation. The amp does
not/will not take a PWM control signal in.
In order to get from MACH2 (step and Direction) to +/- 10VDC control
voltage you need two things: A circuit to convert the Step and
Direction PWM output to +/- 10 and a feedback path (positional) to
give you an error voltage. The circuit I am aware of is the Rutex
R997 Step to Servo control card but a quick transversal of their
current web site no longer shows that as a product. The specs are
still in the download section. If they have quit making that card
then the options start to slim down. They have a brushless DC motor
control card but it still needs feedback from a digital encoder
rather than the tach. It would take the place of your amps you bought.
Maybe soembody else knows of a Step/Direction to +/- 10 analog
converter?
Jon at Pico has a servo card that may drive your brushless amps but
his cards work only with EMC and the THC for MACH2 will not work with
it.
wrote:
> I just purchased a Two API Brushless Servo Motors w/ AMC Amps andThis appears to a standard Servo amplifier that uses the motor tach
> Power Supply in the right up it say it uses pwm+- and I wonderd if
> any body has use this setup or can it be changed to step and
> direction.
> I would like to use mach 2 with out much trouble. This is being
> used
> on a plasma table
> Amplifiers: http://www.a-m-c.com/download/b15a.pdf
> Motors: http://www.apicontrols.com/newapi/products/turbo_mbt23.html
> the part
> number for the motor is MBT-N231 and B12A6 for the amplifiers. More
> information for these setups can be obtained at the websites below.
> http://cgi.ebay.com/ws/eBayISAPI.dll?
> ViewItem&item=3820060149&sspagename=STR
> K%3AMEWN%3AIT&rd=1
>
> I just paid for the license for mach 2 I like the program if I can
> get these
> motors to work. the next Item is thc from Campbell's Designs
> Thanks Randy
> P.S Yes I'm a newbe
(or it appears motor current optionally) to get velocity feedback.
The commanded velocity from the computer is compared to the motor
velocity for speed. The Amps need a +/- 10VDC control voltage input.
I will have to defer to someone else in the next part and that has to
do with positional feedback. I don't know if the three hall sensors
can be used like an encoder or just for commutation. The amp does
not/will not take a PWM control signal in.
In order to get from MACH2 (step and Direction) to +/- 10VDC control
voltage you need two things: A circuit to convert the Step and
Direction PWM output to +/- 10 and a feedback path (positional) to
give you an error voltage. The circuit I am aware of is the Rutex
R997 Step to Servo control card but a quick transversal of their
current web site no longer shows that as a product. The specs are
still in the download section. If they have quit making that card
then the options start to slim down. They have a brushless DC motor
control card but it still needs feedback from a digital encoder
rather than the tach. It would take the place of your amps you bought.
Maybe soembody else knows of a Step/Direction to +/- 10 analog
converter?
Jon at Pico has a servo card that may drive your brushless amps but
his cards work only with EMC and the THC for MACH2 will not work with
it.
Discussion Thread
callcbmf
2004-06-15 15:22:44 UTC
Servo amp using pwm+- with mach 2
caudlet
2004-06-16 14:11:44 UTC
Re: Servo amp using pwm+- with mach 2