Author Topic: SC024_C2P07 FeddBackCurrent  (Read 791 times)

Offline macbahi

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SC024_C2P07 FeddBackCurrent
« on: October 31, 2022, 05:33:48 PM »
Hi!

Please I want to test my SC024 C2p07 output. How many current it will supported. 
When I set my output C2p07 to 1.  Our Leds are on and the current is a total 5,7A using current meter (tester).
But in service tools using feed back current I found 4,06A and 3,2A. Please see the image enclosed.
First why FeedBackCurrent in master and slave are different.
And also why the current meter (tester) (5,7A) is different then the FeedBackCurrent 4,06.
And the last current normally the maximum output current is 3A. So, Please why the controller is not protected the output.

Thanks in advance for your help

With best regards

Offline macbahi

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Re: SC024_C2P07 FeddBackCurrent
« Reply #1 on: October 31, 2022, 08:37:32 PM »
Hi!

I increased the load until the C2P07.OutputisDisabled and Status was 144 and C2P07.DigOut stay equal to 1.
Please what mean the number 144.
In manual took about 16=overload   32=Output Mode Error,  64=Safety Layer Failure,  128=Safety FET Disabled,   256=Internal Voltage Out of Range
I didn't find 144 in document see image enclosed.

Thanks in advance

best regards

Offline acmall

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Re: SC024_C2P07 FeddBackCurrent
« Reply #2 on: November 01, 2022, 09:15:56 AM »
Would be interested in hearing from Danfoss as to why such a difference in the current readings between primary and secondary.

The overload protection on the output is at 5.00A to 5.25A
For the status signal you need to look at the individual bits. Decimal 144 is 1001 0000 in binary so: -
bit 4 - Overload
bit 7 - Safety FET disabled by secondary

Offline macbahi

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Re: SC024_C2P07 FeddBackCurrent
« Reply #3 on: November 01, 2022, 03:20:13 PM »
Hi Sir acmall,

Thank you for your answer

Please could you tell me where Danfoss document show 5A et 5.25A.

Why tester current is usually different than Feedbackcurrent.  The different is closed to 2A.

Thanks

With best regards

Offline acmall

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Re: SC024_C2P07 FeddBackCurrent
« Reply #4 on: November 01, 2022, 03:35:35 PM »
I don't know why you are seeing such a difference in the current values.

You can find the information on the overcurrent limits in the PLUS+1 SC0XX-1XX Safety Controller Family Technical Information here: -
https://assets.danfoss.com/documents/182576/BC152986482939en-000705.pdf

There should also be a copy of this in the Plus+1 Guide Hardware Tab under your SC024 controller.

Offline PosFdbk~~~~~

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Re: SC024_C2P07 FeddBackCurrent
« Reply #5 on: November 03, 2022, 08:09:45 PM »
Even though the feedback is an S32, I think it is limited to S16 someplace.  The feedback current number you are seeing is the limit of a S16 number in the positive direction.

Since the output is only rated for 3 amps, I'm guessing they decided it wasn't needed to accurately measure above that.

Offline pinias

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Re: SC024_C2P07 FeddBackCurrent
« Reply #6 on: November 09, 2022, 12:21:43 AM »
Guys,

So does that mean that I can read the actual current consumption by the load -with the SC controllers output-?

Currently on the MC controllers the "current output" is only a value that tells you what current output the controller can supply, not necesarily is the current consumption by the load or in other words it is not the real current consumption by the load.

I got an aplication where I choke the current going to my load, at the controller it tells me the current out is 500mA however my load sees only 20mA becuase of my rheostat, I really would like to see what current is been drawn by the load instead of what current the controller can possible supply.

so, Can the SC version do that? 
looks like it only is possible with the service tool, at the PIN configuration I see no any feedback current choice to be read, am I correct on this?

Thank you for the feedback

Regards


Offline acmall

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Re: SC024_C2P07 FeddBackCurrent
« Reply #7 on: November 09, 2022, 09:18:59 AM »
It is also possible to see the current on the MC controllers. Depending on which controller (and possibly HWD version) it may be called FeedBackCurrent or FeedBackValue.

If you want to read it in your program you will find it on the input bus for each pin. Attached screen shot is form MC050-110.

Offline macbahi

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Re: SC024_C2P07 FeddBackCurrent
« Reply #8 on: November 09, 2022, 03:11:21 PM »
Hi Pinias,

Yes you can.  As acmall show you. 
I use SC024-120.
The problem is if your load exceeds more than 3A the feedbackcurrent value is not correct.  I think is baug problem.
For my SC024 test the current output is more than 5A without overload but feedbackcurrent is not correct.
So if your load is equal or less then 3A the FeedbackCurrent value is exact.

With best regards


Offline pinias

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Re: SC024_C2P07 FeddBackCurrent
« Reply #9 on: November 09, 2022, 04:24:39 PM »
ahh those variables are in the input side..

 >:( i pulled my air out for days trying to figure it out...man

cool, great

thanks for the hint guys
 :D