Help with FLA Calculation

[Tim Ganz]

I need help determining how to code a motor FLA reading. The HMI has a numeric display with a bar from 0-150% FLA and it's looking for a integer number in a SLC 500 processor.

I have the Motor data plate FLA in a integer data file and I have the actual FLA of the motor from the current ring in a float but how would you code that to compare to the data plate FLA and display a integer number 0-150?

 

[mellis]

It's a simple scaling problem. Actual Amps / motor nameplate FLA * 100 = % of FLA

 

[Tim Ganz]

Yes but how to scale between 0-150% and make sure it does not show above 150%?

 

[mellis]

If the actual amps is greater than the FLA, you will be over 100%. There is no need for any other scaling. If your motor should exceed 150% it will simply peg the bar, the numeric will still be accurate. In the real world, this condition won't last long, the motor will trip on overload.

 

[Tim Ganz]

What is the best method to code this using the SCP block or a compute block?

 

[Tim Ganz]

I tried a compute block online where I have F60:0/F60:1*100 with a destination of F60:2 and F60:0 is my actual amps and F60:1 is my data plate FLA but the compute block won't accept and says it has errors?

I tried to make the destination a integer file also N100:0 but it won't accept that either?

Where am I going wrong?

 

[Helliana]

Division in a compute block is done with a "|" instead of an "/".