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Starter Speed vs SINA_POS VeloAct speed

3/16/2018 2:37 AM	Rate (0)
Jake_367 Posts: 23 Rating: (1)	Hello all, I am trying to figure out what the speed of my motor is. In Starter software, I can see my motor is turning at roughly 2185 RPM. When I look at the SINA_POS function block, the "VeloAct" is roughly 783,000,000.... I have no idea what this number is representing. Its a DINT but that's as far as i can figure it out. Can anyone tell me how 2185 RPM equals 783,000,000 (not sure what the unit of this number even is) Also what unit this 783k is representing. Screen shots included. Thank you to any ones input and assistance. Attachment Starter Speed.PNG (469 Downloads)
Jake_367 Posts: 23 Rating: (1)
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3/16/2018 2:43 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 1/14/2026 Posts: 6066 Rating: (828)	Hello, in standard telegram 111 is the actual speed value r63 in PZD8/9. This value is in relation to p2000. I suppose p2000 = 3000rpm? Because your value is 781025152 100 % = 1073741824 So 781025152 / 1073741824 * 3000rpm = 2182rpm. If you want to get the actual velocity in [1000 LU/min], you can parametrize: p2079 = 999 (free bico) p2061[7] = r2522[0]
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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3/16/2018 9:41 PM	Rate (0)
Jake_367 Posts: 23 Rating: (1)	Thank you for the very quick response, your math definitely makes sense. The motor is a 3000RPM motor, and p2000=3000. One question i have is what does 1073741824 represent ? i understand its 100% of p2000 but what exactly is this value ?. Second question i have is, is it safe to assume under these conditions that 1RPM = 357913.9413333333 ?
Jake_367 Posts: 23 Rating: (1)
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3/17/2018 4:47 PM	Rate (0)
zako_ Posts: 895 Rating: (67)	1RPM = 357913.9413333333 no because you get an 32bit dint value so I suppose you will get 357914 .
zako_ Posts: 895 Rating: (67)	Last edited by: zako_ at: 3/17/2018 4:47:48 PM
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