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  1. #1
    Join Date
    Aug 2006
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    servo amplifier

    Hi Ive acquired 2 areotech servo amplifiers and servos i need to know how to get started wiring them just to experiment at first then for my lathe areotech BA20-160

  2. #2
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    Dec 2003
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    The manuals should be on the web site, I have them in PDF if you have a problem.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
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    reply

    Hi Al Thank You very much for the reply..I have the manual....but i don't understand servo motor control. i understand stepper motor. maybe you can point me in some basic direction

  4. #4
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    Industrial servo's are commonly driven with what is commonly called a +/-10 vdc analog control voltage. If yours use this method, they work as follows:

    The polarity (+ or -) tells the direction to go which is not unlike your "direction" bit on a step/direction stepper.

    The magnitude of the voltage (0 versus 1 versus or 10) tells how fast. Where relatively speaking, a 0.00 volt signal is no speed in either direction and +5 volts is perhaps 50% of the rated speed of the motor assuming that rated voltage is applied at +10vdc or 100%. If the signal is -5 volts, the motor runs at half speed in the opposite direction.

    In steppers, you'd throw more pulses faster to make the motor run faster. In a servo, you increase the ON time of the PWM "H bridge" which is driving the motor to make it run faster.

    Check out Unitrode/TI. They have some servo control IC's that have appications notes that explain a lot about how servo's work and they feed back speed and/or position signals to the servo controller. I think UC3637 is one that does a good job of explaining.

  5. #5
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    Aug 2006
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    new

    Hi NCCams thank for the info i have a CMC 2620 servo and a areotech amplifier do you have a link to help me experment with these two devices

  6. #6
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    a start

    OK i found this i guess i need a digital controller can anyone elaborate on this
    Attached Thumbnails Attached Thumbnails MOTORS_FIG9.gif  

  7. #7
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    Quote Originally Posted by frankg521 View Post
    Hi Al Thank You very much for the reply..I have the manual....but i don't understand servo motor control. i understand stepper motor. maybe you can point me in some basic direction
    The hook up is fairly straight forward, if you have the commutation AND encoder option then the three commutation outputs go to the Aerotech drive and the encoder will split off and go to your controller, whatever that maybe, they usually come with a 1000p/rev differential encoder.
    If you want to just hook it and and try turning the motor, a ±9vdc drive signal can be made with a 9v battery and a potentiometer to the analogue input.
    If you want to search for some info google Brushless DC servo.
    And also search quadrature encoder.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  8. #8
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    Quote Originally Posted by frankg521 View Post
    OK i found this i guess i need a digital controller can anyone elaborate on this
    The BA amp is ±10vdc analogue control, not digital, you can get highend controller cards or CNC systems that use this method (ANALOGUE) or if you use the common hobbiest method of step & direction through the parallel port, Mach etc, you will need a step/dir to analogue convertor. There is one used in the forums here, the name escapes me at the moment.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  9. #9
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    Quote Originally Posted by frankg521 View Post
    i have a CMC 2620 servo and a areotech amplifier
    I have to make a correction, in your original post you mentioned you had Aerotech drives AND motors, but if you have the BA Brushless DC amp and a CMC2620 motor, IIANM this is a DC brushed motor, if so you will have to set the BA for 60° commutation and just use the U V outputs on the drive.
    It works fine in this mode as a DC brushed amplifer/drive.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  10. #10
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    Dec 2005
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    There is this neat tool called Google that doesn't require much input to tell you what you want/need to know.

    In this cae, simply by typing in "CMC 2620 servo", the following came up right away:

    http://www.cmccontrols.com/brush_ser...atform2600.asp

    Go down about 2/3 the way of the page.

    For "areotech" the same google search via "areotech servo amp" yielded:

    http://www.aerotech.com/products/amps/4020order.html

    You should be able to dowload what you need to figure out what you want/need to know.

    Just be sure to choose the correct amp that matches what you have and, providing it matches your servo and control scheme input, you should be able to experiment enough to make the motors rotate in a predictable direction.

  11. #11
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    The Aerotech link is for a DC amp, I think Frank has a the Aerotech BA20 DCBL/DC amp & a DC motor, slightly different animal, but I have them working with CMC motors with no problem.
    You just do not use the commutation feedback.
    In the 60° mode, U & V act as a typical H bridge DC drive.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  12. #12
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    Dec 2003
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    24216
    Quote Originally Posted by frankg521 View Post
    Hi Ive acquired 2 areotech servo amplifiers and servos i need to know how to get started wiring them just to experiment at first then for my lathe areotech BA20-160
    Here is a usefull engineering reference for hook up etc.
    http://www.a-m-c.com/download/docume...l/engnotes.pdf
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  13. #13
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    Dec 2005
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    Al

    My intent of post #10 was more of SHOWING HOW a member can use a very few key word terms and Google search as opposed to merely ANSWERING his question..

    Sort of analogous to "feed a man who's hungry and he'll remain hunger free for a day, tech him to fish, he'll won't have to ever have to fear being hungry again".

    A nice primer on the basics of BRUSH type motor drives for ANALOG (+/-10) based drives is found in the Unitrode/TI UC3637 IC. Get ahold of the U-102 application note from the same firm.

    By the way, Unitrode/TI also has a number of BRUSHLESS drive IC's as well as STEPPER drive IC"s for the fans of same - ditto that for the appropriate appliccations notes.

    Good fish food as well.

    With the Unitrode/TI info, the member should be able to do a lot more successful fishing.

  14. #14
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    Aug 2006
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    289
    Thanks for posting that link Al... good info.

    Skyko makes that pixie card that I think you were referring to btw. The one that converts 5v digital to 10vdc analog. However, people are warning that they are not responding to inquiries at the moment.

    I wonder if the digital-to-analog (0-10v optional) feature that the G-Rex controllers offer means that it is capable of driving a 10vdc analog amp like the BA series? I have wondered about this after reading the G-Rex description PDF and seeing this option.

  15. #15
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    Aug 2006
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    119

    is it so

    is this true al can i use G-Rex to control my analog amplifier

    Frank

  16. #16
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    I am not familiar with the G-Rex, but the manual should tell you.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  17. #17
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    Aug 2006
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    289
    From the G100_DESCRIPTION.pdf:

    "5) 4 Digital to analog outputs. Each output is a 0 to 5V (0 to 10V optional) op-amp output and 8-bit resolution"

    I'm not sure if this means it can do it but it would be cool if it could!

  18. #18
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    Aug 2006
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    119

    no solition yet

    No. The G-Rex doesn't support closed-loop operation.

    Mariss
    ----- Original Message -----
    From: [email protected]
    To: [email protected]
    Sent: Wednesday, July 18, 2007 7:26 AM
    Subject: G-Rex


    Can i use G-Rex to drive _+ 10 volts analog servo amplivier and servo

    Frank

  19. #19
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    Aug 2006
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    289
    Thanks for finding that out Frank. That's too bad. So, if the G-rex controller doesn't support a closed-loop operation then does that mean that it's up to the drives to control the feedback loop? Sorry for my ignorance!

  20. #20
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    Aug 2006
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    Quote Originally Posted by yantra3d View Post
    Thanks for finding that out Frank. That's too bad. So, if the G-rex controller doesn't support a closed-loop operation then does that mean that it's up to the drives to control the feedback loop? Sorry for my ignorance!
    yantra3d, I believe that is a question for Al ,,,as for my education on servos is just starting...But!!!! i believe on the Mach support forum geri21 sead that G-Rex will soon support closed loop but no time frame from Gecko.. but i could be wrong i think i read every post on that page ........

    Frank

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