How reading Rpm speed from fp quad 510

[nicola]

I have an encoder of 2500 ppm quadrature differential signal, and i link
this with a FP_quad_510
The value reading count/microsec how is possible to transform in RPM?
Why if i use the FP configurator in the edit device/channel if i setting a
range of -1,25_1,25 coerce the value range at the default range setting?
Courtesly i would like information of field point quadrature encoder end
reading position,speed,reset on the revolution exc.

Thank for answer Nicola

[pravin b]

Nicola,
As for converting the count/us into a RPM reading,you will have to do it inside your software program. It's gonna depend on the counts/revolution on your quad encoder. You can then mathematically calculate the RPM and display that on your panel.
Ex: 'count/us value' / (1,000,000*60) = counts/min
> 'counts/min' / (counts/rev of your encoder) = RPM

I am unable to follow the second question but if you mean that your count values coerce when set to +_ 1.25 velocity range setting, it could probably be becuase the velocity resolution at that range is 38.15 counts/s and so you may not be able to see smaller counts.

You can find more information about the position counters, velocity measurement(speed), index status etc in the FP QUAD-510 Operating Instructio
ns Manual at : http://www.ni.com/pdf/manuals/322633b.pdf

To program the QUAD-510 'Reset', right click on the FP-QUAD-510 @x and choose Edit This Device. Then click on Channel Configuration. In the Channel Commands box, press the button that says Create Item. This will create a channel named "Control @Ch0". You can then write to the "Control @Ch0" item as if it was a normal output. Anytime in your code that you write a value of 1 to the "Control @Ch0" item, it will reset Axis 0 (channels 0 and 4). To change which channel you are resetting, simply change the checkboxes before pressing the Create Item button.

Hope this helps,
Pravin

[nicola]

Thank's for answer,
Now i have try to coerce the 1,25 range and i select customer value.This
mode bring the 1,25 range.
Nic

"Pravin B" ha scritto nel messaggio
news:5065000000050000005EB70000-1031838699000@exchange.ni.com...
> Nicola,
> As for converting the count/us into a RPM reading,you will have to do
> it inside your software program. It's gonna depend on the
> counts/revolution on your quad encoder. You can then mathematically
> calculate the RPM and display that on your panel.
> Ex: 'count/us value' / (1,000,000*60) = counts/min
> > 'counts/min' / (counts/rev of your encoder) = RPM
>
> I am unable to follow the second question but if you mean that your
> count values coerce when set to +_ 1.25 velocity range setting, it
> could probably be
becuase the velocity resolution at that range is
> 38.15 counts/s and so you may not be able to see smaller counts.
>
> You can find more information about the position counters, velocity
> measurement(speed), index status etc in the FP QUAD-510 Operating
> Instructions Manual at : http://www.ni.com/pdf/manuals/322633b.pdf
>
> To program the QUAD-510 'Reset', right click on the FP-QUAD-510 @x and
> choose Edit This Device. Then click on Channel Configuration. In the
> Channel Commands box, press the button that says Create Item. This
> will create a channel named "Control @Ch0". You can then write to the
> "Control @Ch0" item as if it was a normal output. Anytime in your code
> that you write a value of 1 to the "Control @Ch0" item, it will reset
> Axis 0 (channels 0 and 4). To change which channel you are resetting,
> simply change the checkboxes before pressing the Create Item button.
>
> Hope this helps,
> Pravin