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S7-1200 control siemens VFDs speed -- HELP !!

Created by: leonlai909 at: 5/3/2013 10:15 PM (3 Replies)

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5/3/2013 10:15 PM	Rate (0)
leonlai909 Posts: 26 Rating: (0)	hi folk, I'm trying to control siemens VFD speed by .... UNSCALE, but look like when I use UNSCALE, the ouput PUT out 0 (type WORD). Do I miss something or it is not the right Function for control VFDs ?? Thanks
leonlai909 Posts: 26 Rating: (0)
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5/3/2013 10:26 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/1/2023 Posts: 13953 Rating: (2277)	f kk hi folk, I'm trying to control siemens VFD speed by .... UNSCALE, but look like when I use UNSCALE, the ouput PUT out 0 (type WORD). Do I miss something or it is not the right Function for control VFDs ?? Thanks Are you controlling via analog signal, via profibus, profinet? What is the UNSCALE being used for? I normally use a combination of NORM_X and SCALE_X to get from internal user units to counts.
	science guy
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5/3/2013 10:32 PM	Rate (0)
leonlai909 Posts: 26 Rating: (0)	I use Analog 2 wire !! This is the first time I control Siemens VFD by STEP 7 So I really not sure what i'm going to do !! So I still use UNSCALE 4-20 mA or I have to use the 2 other function you mention ??? Any suggestion will help, thanks
leonlai909 Posts: 26 Rating: (0)
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5/4/2013 6:31 AM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 11/23/2023 Posts: 1500 Rating: (221)	f kk I use Analog 2 wire !! This is the first time I control Siemens VFD by STEP 7 So I really not sure what i'm going to do !! So I still use UNSCALE 4-20 mA or I have to use the 2 other function you mention ??? Any suggestion will help, thanks Hello f kk, see an example of how to normalize and scale an analog input in S7-1200.
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