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-   -   Questions about modes of AC drives (http://www.plctalk.net/qanda/showthread.php?t=114501)

bodoo23 March 3rd, 2018 10:23 AM

Questions about modes of AC drives
 
Nowadays I have started to work on AC drives. I'd like to ask the questions below.

1-If we control drive positioning mode. I know we can set its positioning speed but is it possible to set its torque and make it go this position with a specific torque (without controlling speed)

2-I know we can set torque limits in speed mode but as I saw on a website , in torque control mode we cant set limit to speed. Is it right ? it sounds wrong to me.

Or these things can vary from brand to brand or (type of ac drives) ?

Thanks.

DickDV March 8th, 2018 07:58 PM

Actually three questions. All can be answered "yes". However, you are generally better off doing positioning with a servo. Trying to do it with a VFD is a stretch for the technology. Sure, various VFD manufacturers will promote their "positioning" or "semi-servo" programs for their VFD's but it's still a stretch.

Spend the money and do positioning with a servo. You will like the results longer.


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