SINAMICS

Analog Setpoint Holding

Thread Starter: Ashutosh Kr   Started: 8/2/2012 6:56 AM   Replies: 4

  8/2/2012, 6:56 AM

Ashutosh Kr Joined 3/15/2011 Last visit: 5/20/2013 Posts: 52 Rating:  (5)

(0)  Dear All, I have 200 Kw (PM 240) Sinamics g120 drive having control card CU240 E-2 FIRMWARE VERSION 4.4.The setpoint is comming from  analog  source  in the form of 4-20 mA. The customer demands that in case the setpoint falls below 4 mA ,the drive should run as per last setpoint.i wanted to know wheather this can be achieved or not.I know this can be achived in case of motorised potentiomter.but can it be done i case of Analog input . Can this realised throgh FFB. My scaling values are 4mA= 25% speed 20mA=100% speed  Please Help , i want your help desparately Regards

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  8/2/2012, 11:24 AM

JensS Joined 10/29/2007 Last visit: 4/24/2013 Posts: 651 Rating:  (41)	(0)  see p0756 to p0760 an example you´ll find in FAQ http://support.automation.siemens.com/WW/view/en/5127160 it´s written for MM420 but can be used for G120 (without the 300Ohm resistor) Mit freundlichem Gruß / Best regards Jens S
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  8/2/2012, 12:06 PM

Ashutosh Kr Joined 3/15/2011 Last visit: 5/20/2013 Posts: 52 Rating:  (5)	(0)  HiJen S thanks for your prompt reply , but i have already commissioned the system ,it is running, but the customer is demanding that in case there is a wire brakage the the drive should run as per previou setpoint , im tring to implement this logic using FFB .Perhaps i can get help from your side too Hope this explians my problem Regards
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  8/2/2012, 3:27 PM

JensS Joined 10/29/2007 Last visit: 4/24/2013 Posts: 651 Rating:  (41)	(0)  a explanation you will find in OPI chapter 6.4 Analog inputs; Table 6- 5      Parameters for the scaling characteristic and wire break monitoring http://support.automation.siemens.com/WW/view/en/61618946 or direct-link: https://www.automation.siemens.com/mdm/default.aspx?DocVersionId=42407973387&Language=en-US&TopicId=30400184587 Mit freundlichem Gruß / Best regards Jens S
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  8/4/2012, 8:25 AM

Ashutosh Kr Joined 3/15/2011 Last visit: 5/20/2013 Posts: 52 Rating:  (5)	(0)  Hi Jens S ,Thanks for your reply once again , i accomplised the task with the help of FFB .I'm attaching a copy so that i can be helpful for someone in future Regards Attachment: scan0031.pdf  (22 Downloads)
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