Amp reading

16 years 3 months ago #905599 by yarfik
Amp reading was created by yarfik
I have just begun to bench test my new ax2550.
RC mode works fine as does 232 mode except:

The amp and peak amp readings are not reading correctly.
Unloaded, my handheld shows the magmotor drawing about 3 amps. The reding pc screen says 0. I have to apply drag to the motor to increase amp draw to 15 as read by the handheld to have the pc display even 1 amp. My new laptop does not have a serial and I am using a usb adapter. I do not get any error messages but wonder if this could be the reason for the problem.

PS: Voltage and powers readings work just fine.

Shawn

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16 years 3 months ago #925173 by cosma
Replied by cosma on topic Re:Amp reading
Try uploading the controller firmware again. The first time the controller is powered up after a new firmware install, it calibrates and stores the 0A value. It may be that this automatic calibration procedure did not complete properly last time the software was loaded.



Latest software as of 6/24/04 rev is 1.5s. You may download from www.roboteq.com/download/roboup15a-052204.obj



Cosma

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15 years 2 months ago #5667947 by filmcraft
Replied by filmcraft on topic Re:Amp reading
'm having this same problem and I have vs 1.7 any ideas?

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15 years 2 months ago #5677861 by
Replied by on topic Re:Amp reading
<P style="MARGIN: 0px">I am also having this problem, and was about to ask Cosma about it. This was a new out of the box AX2850HE with the latest firmware (1.7b? i believe). Everything else is working fine, but no amps/peak amps readings in roborun.
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">Looking for an answer...
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">Thanks,
<P style="MARGIN: 0px">Barry O'Brien

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15 years 2 months ago #5678747 by cosma
Replied by cosma on topic Re:Amp reading
<P style="MARGIN: 0px">We will look into this to verify that there is no flaw in the software.
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">In the meantime, you can try reinstall the firmware. New firmware will cause the initial calibration to repeat.
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">Keep in mind that the amp measurement is across the full scale of the controller's ability (~140A), so you will not see or get very accurate readings at very low value.

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15 years 2 months ago #5681015 by filmcraft
Replied by filmcraft on topic Re:Amp reading
What do you consider a low value, that may be the solution there. I am using a motor then when connected to an amp meter reads at 2.1mp draw, will it read that?

I also reloaded the software as well and new firmware.

Perhaps it relates to certain types of motors it can read only?

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15 years 2 months ago #5685844 by cosma
Replied by cosma on topic Re:Amp reading
<P style="MARGIN: 0px">2.1 A is at the very bottom of the range. The controller should report a value of 1, maybe 2.
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">Try loading the motor to increase the current. If you do not see a controller reading at say 5 to 10A, then something is wrong.
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">Amp reading is independent of the kind of motors.

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