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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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10/3/2020 2:53 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 2/19/2021 Posts: 241 Rating: (3)	Thanks for all your support and help. Actually now the hz is working but if i enter the 10 HZ as setpoint from PLC, in vfd it showing as 13.5 Hz as a setpoint. If increase or decrease also the VFD setpoint value is not matching to my PLC setpoint. please advise.

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10/4/2020 7:36 PM	Rate (0)
zako_ Gold Member Joined: 5/22/2012 Last visit: 1/31/2021 Posts: 881 Rating: (61)	What is p2000 What is in r2050[1] if you use Telegramm 1 ?

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10/5/2020 3:16 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 2/19/2021 Posts: 241 Rating: (3)	zako_ What is p2000 What is in r2050[1] if you use Telegramm 1 ? Please find the attached document for your reference. And also i never found the r2050[1] in VFD Parameter. Thanks in advance. Attachment VFD.docx (19 Downloads)

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10/5/2020 8:16 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 2/24/2021 Posts: 3166 Rating: (502)	There's 38 entered as a reference speed. Therefore 38Hz - 100%. Because your maximum speed is 38 Hz as well, you can change a setpoint scaling in a PLC.
	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.
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10/5/2020 11:30 AM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 2/19/2021 Posts: 241 Rating: (3)	jacek d There's 38 entered as a reference speed. Therefore 38Hz - 100%. Because your maximum speed is 38 Hz as well, you can change a setpoint scaling in a PLC. Thank u will check and update Actually the maximum speed is 38 rpm not Hz. If i change that 38rpm to 50 rpm means it should work ? why the maximum speed is in RPM instead of Hz? My rated Motor RPM is 38 RPM so i kept that the Reference speed in RPM and Maximum speed in RPM is same , whether is it right ?
	Last edited by: GUWS at: 10/05/2020 11:43:02 Last edited by: GUWS at: 10/05/2020 11:46:43 Last edited by: GUWS at: 10/05/2020 12:00:43
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10/5/2020 11:56 AM	Rate (1)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 2/24/2021 Posts: 3166 Rating: (502)	My mistake. It should read RPM not Hz. A setpoint for a motor is in RPM. So you send 10 (RPM) therefore 10/38*50Hz = 13Hz. GUWS why the maximum speed is in RPM instead of Hz? Because Hz is not an unit of a rotational speed?
	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.
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10/5/2020 12:10 PM	Rate (0)
GUWS Bronze Member Joined: 4/18/2014 Last visit: 2/19/2021 Posts: 241 Rating: (3)	jacek d My mistake. It should read RPM not Hz. A setpoint for a motor is in RPM. So you send 10 (RPM) therefore 10/38*50Hz = 13Hz. GUWS why the maximum speed is in RPM instead of Hz? Because Hz is not an unit of a rotational speed? Yes yes i calculate that thats why i asked as follows. My rated Motor RPM is 38 RPM so i kept that the Reference speed in RPM and Maximum speed in RPM is same , whether is it right ? If i change that 38rpm to 50 rpm means it should work ?
	Last edited by: GUWS at: 10/05/2020 12:11:08
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10/5/2020 2:23 PM	Rate (1)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 2/25/2021 Posts: 10152 Rating: (1685)	Look in p2000 for reference speed. It is generally set to a convenient value for scaling, or for motor maximum rpm (same or higher than rated rpm, but usually higher). For example, many motors are rated at 1/2 or 1/3 of their maximum speed, especially inverter duty motors. For your specific situation, scaling the command setpoint so it is the correct proportion of the maximum speed to get desired speed. If p2000 is 100 rpm, 1% of 16384 (164) sent to the drive will give you 1 rpm. For 38 rpm, sending 6226 should give you the desired rpm (6225.9 <= 38.0/100.016384.0). Be sure and use NORM_X and SCALE_X in the PLC (s7-1200/1500) rather than using simple math instructions. Hope that makes sense. GUWS jacek d My mistake. It should read RPM not Hz. A setpoint for a motor is in RPM. So you send 10 (RPM) therefore 10/3850Hz = 13Hz. GUWS why the maximum speed is in RPM instead of Hz? Because Hz is not an unit of a rotational speed? Yes yes i calculate that thats why i asked as follows. My rated Motor RPM is 38 RPM so i kept that the Reference speed in RPM and Maximum speed in RPM is same , whether is it right ? If i change that 38rpm to 50 rpm means it should work ?
	science guy
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