X90CP174: Output current measurement - interpretation INT value / unit

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1

Hello,

I would like to adjust or correctly set the current monitoring in my X90CP174. However, I can’t quite figure out from the help how to interpret the INTEGER value for the current measurement.
Unit of the displayed value?

2

Tobias

You can find how it should be interpreted here:
link B&R online help: X90 current measurement INT value

Hope this helps!
Jan

3

Hi Jan,

thanks for your help. I found this already in the B&R help. I can’t understand what it mean exactly.

For example. I have an value of 4644 as INTEGER Value. How do I calculate it regarding the online help. Maybe you can explain it to me.

1 LSB of the INT value corresponds to 610 µA.?

4

Hi Tobias,
I’ve never used the X90CP174.
Based on the information in the help section, the calculation for your example is rather simple: 4644*610 µA
That equals 2832840 µA
= 2832.84 mA
= 2.83 A
(2,83 Ampere, with the german decimal seperator :wink: )

LSB = least significant bit
For an integer the LSB represents the smallest possible step size. For an integer the step size is always 1 ==> if the integer value increases by 1, the current increases by 610 µA

5

Hi Björn,

thanks a lot for explaining! Now I understand it.

Regards
Tobias