Hi Steve,
It would probably be simpler to use Kanalog with external analog drives and let the drives close the velocity loop using the tachometer or encoder on the motor.
Then
close the Glass Scale outer Position Loop with KFLOP+Kanalog.
It is usually necessary to have feedback both from the motor shaft and the glass scales to have a good stable system.
Why do you want to get rid of your Analog drives?
Regards TK
| Group: DynoMotion |
Message: 7021 |
From: Steve Klemp |
Date: 3/18/2013 |
| Subject: Re: DC Brushed Servo Motors / SnapAMP |
Hi Tom, I don't know much about my analog drives. one thing that had me puzzled, The analog signal to control them is -15 / +15VDC I have not found any controls including the Kanalog that says they are for this range. Most say -10 / +10VDC Am I missing something or can they be used in this range?
"It would probably be simpler to use Kanalog with external analog drives and let the drives close the velocity loop using the tachometer or encoder on the motor.
Then close the Glass Scale outer Position Loop with KFLOP+Kanalog.
It is usually necessary to have feedback both from the motor shaft and the glass scales to have a good stable system."
This sounds like a good solution, But with my limited knowledge on the subject I didn't know if I could make that happen. If the information "How To" is available I
am certainly willing to do it.
As always, thanks for your quick replies!
| Group: DynoMotion |
Message: 7022 |
From: Michael Rosenfield |
Date: 3/18/2013 |
| Subject: Re: DC Brushed Servo Motors / SnapAMP |
Steve, Another approach - the one I used for my mill - is to purchase used Advanced Motion Control drives off ebay. I also have 90V motors, and I was able to find some AC-powered drives for about $100 per axis. The motors had tachs already, which I feed to the drives, and I use the Kanalog to control the drives. I used 16A20AC AMC drives, which wire directly to AC power (I reused the isolation transformer already in the mill), take +/-10V input, and provide 8A continuous and 16A peak. Plus, their website http://www.a-m-c.com/products/drives.html has a wealth of info, and their tech support is excellent - they are happy to support their drives, no matter if you bought them used. I'd stay away from Galil drives - plenty available on Ebay, but their tech support is close to nil. Hope this helps! Michael Rosenfield
| Group: DynoMotion |
Message: 7029 |
From: Steve Klemp |
Date: 3/18/2013 |
| Subject: Re: DC Brushed Servo Motors / SnapAMP |
Hi Tom, I tested my drives today and they power up and seem to be fine. Since they are looking for an analog signal of -15 to +15 VDC. Will the Kanalog work with these drives?
Thanks!
------------------------------
On Mon, Mar 18, 2013 2:36 AM CDT Tom Kerekes wrote:
>Hi Steve,
>
>It would probably be simpler to use Kanalog with external analog drives and let the drives close the velocity loop using the tachometer or encoder on the motor.
>
>Then close the Glass Scale outer Position Loop with KFLOP+Kanalog.
>
>
>It is usually necessary to have feedback both from the motor shaft and the glass scales to have a good stable system.
>
>
>Why do you want to get rid of your Analog drives?
>
>Regards
>TK
>
>
>
>________________________________
> From: ricochetproducts <steveklemp@...>
>To: DynoMotion@yahoogroups.com
>Sent: Sunday, March 17, 2013 1:56 PM
>Subject: [DynoMotion] DC Brushed Servo Motors / SnapAMP
>
>
>
>I have 3 Brushed Servo motors. I am wanting to get away from the OEM Analog
>drives. My motors are rated 90 VDC @ 11.3 amps (max) I am looking into using a
>Kflop / SnapAMP 1000 / Heidenhain Glass scales.
>
>Would the SnapAmp Be the right choice for this application?
>If not, What would be a solution?
>
>This is a Mill Retrofit.
>
>Regards, Steve
>
>
> |
|
| Group: DynoMotion |
Message: 7030 |
From: Tom Kerekes |
Date: 3/18/2013 |
| Subject: Re: DC Brushed Servo Motors / SnapAMP |
Hi Steve,
Kanalog only puts out +/- 10V. I'd be really surprised if your drives really expected a +/- 15V input. Usually analog circuitry runs on +/-15V supplies and processes voltages less that that. +/-10V has been the standard for decades. +/- 15V might me the max range before the input is damaged or doesn't work properly. But anyway it is simple to test. Apply first a small voltage like 1.5V (battery) to the input and see if you get 15% of full speed.
Then apply 10V and see if you get full speed or adequate speed for your needs. If so, Kanalog should work.
Regards TK
| Group: DynoMotion |
Message: 7032 |
From: Steve Klemp |
Date: 3/18/2013 |
| Subject: Re: DC Brushed Servo Motors / SnapAMP |
Hey Tom, thanks again for your reply. That is along the same line that I was thinking. I was surprised to see the -15 / +15. Also. I will give it a try. Thanks again!
------------------------------
On Mon, Mar 18, 2013 8:09 PM CDT Tom Kerekes wrote:
>Hi Steve,
>
>Kanalog only puts out +/- 10V. I'd be really surprised if your drives really expected a +/- 15V input. Usually analog circuitry runs on +/-15V supplies and processes voltages less that that. +/-10V has been the standard for decades. +/- 15V might me the max range before the input is damaged or doesn't work properly. But anyway it is simple to test. Apply first a small voltage like 1.5V (battery) to the input and see if you get 15% of full speed. Then apply 10V and see if you get full speed or adequate speed for your needs. If so, Kanalog should work.
>
>Regards
>TK
>
>
>
>________________________________
> From: Steve Klemp <steveklemp@...>
>To: dynomotion@yahoogroups.com
>Sent: Monday, March 18, 2013 5:59 PM
>Subject: Re: [DynoMotion] DC Brushed Servo Motors / SnapAMP
>
>
>
>
>
>Hi Tom, I tested my drives today and they power up and seem to be fine. Since they are looking for an analog signal of -15 to +15 VDC. Will the Kanalog work with these drives?
>Thanks!
>
>------------------------------
>On Mon, Mar 18, 2013 2:36 AM CDT Tom Kerekes wrote:
>
>>Hi Steve,
>>
>>It would probably be simpler to use Kanalog with external analog drives and let the drives close the velocity loop using the tachometer or encoder on the motor.
>>
>>Then close the Glass Scale outer Position Loop with KFLOP+Kanalog.
>>
>>
>>It is usually necessary to have feedback both from the motor shaft and the glass scales to have a good stable system.
>>
>>
>>Why do you want to get rid of your Analog drives?
>>
>>Regards
>>TK
>>
>>
>>
>>________________________________
>> From: ricochetproducts <steveklemp@...>
>>To: DynoMotion@yahoogroups.com
>>Sent: Sunday, March 17, 2013 1:56 PM
>>Subject: [DynoMotion] DC Brushed Servo Motors / SnapAMP
>>
>>
>>
>>I have 3 Brushed Servo motors. I am wanting to get away from the OEM Analog
>>drives. My motors are rated 90 VDC @ 11.3 amps (max) I am looking into using a
>>Kflop / SnapAMP 1000 / Heidenhain Glass scales.
>>
>>Would the SnapAmp Be the right choice for this application?
>>If not, What would be a solution?
>>
>>This is a Mill Retrofit.
>>
>>Regards, Steve
>>
>>
>>
>
> |
|
| | | | | | | |
