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parameter to convert from Rpm to Hz

Created by: GUWS at: 10/2/2020 3:46 AM (17 Replies)

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10/2/2020 3:46 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 1/20/2025 Posts: 255 Rating: (5)	Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me.

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10/2/2020 8:53 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 1/24/2025 Posts: 4869 Rating: (743)	I'd advise you reading a handbook on electric machines first.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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10/2/2020 9:20 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 1/20/2025 Posts: 255 Rating: (5)	jacek d I'd advise you reading a handbook on electric machines first. Wow thats great advise..... Thanks

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10/2/2020 9:30 AM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (880)	GUWS Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me. Set r0002 = r0024
	Last edited by: PISCEAN 2010 at: 10/02/2020 10:33:51
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10/2/2020 10:00 AM	Rate (0)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 1/24/2025 Posts: 5025 Rating: (1029)	PISCEAN 2010 Set r0002 = r0024 @PISCEAN 2010: I have very little knowledge of the Siemens drives -- so you will have to help me here. Does the 'r' in 'r0002' not indicate it is a read-only parameter? Opening the 'r0024' parameter will have the drive display the output frequency - right? Can you configure the plug-in screen (BOP or other?) to display some values for you by default? GUWS Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me. @GUWS: I ask some clarity for whomever follows up. Where does the "speed setpoint" come from? (analog / digital / comms / user input / pot / ..) Do you wish to only display the setpoint on theVFD screen or should the user be able to set the setpoint on the VFD screen? Which plug-in screen do you have? (BOP-2)
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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10/2/2020 10:13 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 1/20/2025 Posts: 255 Rating: (5)	PISCEAN 2010 GUWS Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me. Set r0002 = r0024 Thanks Mr. PISCEAN, I tried, But its showing read only parameter

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10/2/2020 10:17 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 1/20/2025 Posts: 255 Rating: (5)	qwazee PISCEAN 2010 Set r0002 = r0024 @PISCEAN 2010: I have very little knowledge of the Siemens drives -- so you will have to help me here. Does the 'r' in 'r0002' not indicate it is a read-only parameter? Opening the 'r0024' parameter will have the drive display the output frequency - right? Can you configure the plug-in screen (BOP or other?) to display some values for you by default? GUWS Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me. @GUWS: I ask some clarity for whomever follows up. Where does the "speed setpoint" come from? (analog / digital / comms / user input / pot / ..) Do you wish to only display the setpoint on theVFD screen or should the user be able to set the setpoint on the VFD screen? Which plug-in screen do you have? (BOP-2) Thanks qwazee, I am giving the Speed setpoint from HMI to PLC via profinet communication. My vfd part number is 6SL3210-1KE11-8UF2.

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10/2/2020 10:33 AM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (880)	qwazee PISCEAN 2010 Set r0002 = r0024 @PISCEAN 2010: I have very little knowledge of the Siemens drives -- so you will have to help me here. Does the 'r' in 'r0002' not indicate it is a read-only parameter? Opening the 'r0024' parameter will have the drive display the output frequency - right? Can you configure the plug-in screen (BOP or other?) to display some values for you by default? Hello, Please refer attached sheet for r0002 display values (dependency is r0046) which displays drive operation. As you pointed out correctly, its my fault. Attachment G120C r0002.jpg (453 Downloads)
	Last edited by: PISCEAN 2010 at: 10/02/2020 11:04:48
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10/2/2020 12:13 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 1/22/2025 Posts: 5985 Rating: (824)	Hello, the speed setpoint is transferred as a percentage value referred to p2000 and following parameters. So the easiest way would be to do the conversion on PLC side an provide the adequate setpoint in percent to the SINAMICS. Please see chapter 6.6.2 of the fieldbus manual for more details. https://support.industry.siemens.com/cs/ww/en/view/109757336
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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10/2/2020 3:55 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 1/24/2025 Posts: 15558 Rating: (2468)	Are you using a PLC or HMI connected directly to the drive to send the speed setpoint? If you are using a PLC, in the G120C telegram's 2nd word is where you put the speed setpoint scaled +/- 16384 for +/- 100% speed according to p2000. In p2000 in the G120C, reference speed, is the value that equals 16384. Use NORM and SCALE blocks together to take your RPM and convert it to +/- 100%. There are many examples of scaling the speed setpoint for use with a telegram in these forums as well as Siemens applications showing it being done automatically using TIA Portal SINA_SPEED instruction. GUWS Hi, i am using G120C VFD and i want to convert the Speed setpoint from RPM to HZ. i try to search in manual but i never found the exact one. please advise me.
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