0% Deadband

12 years 4 months ago #27581173 by roboteq
0% Deadband was created by roboteq
Using the AX2550 in Analog mode; input device is the DAC from a LabJack U3 DAQ (I'm using LabView).

I'm getting a "no ctrl" message from my 2550 when I set the Deadband to 0%. My DAC has 10-bit resolution and produces either 2.4994 V or 2.5005 V for it's "neutral" signal, which I'm assuming is not accurate enough for the 2550 to start working. It will work with a 2.4% Deadband, but that sucks. How can I solve this problem? Is there a way of over-riding or tricking the "no ctrl" feature?

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12 years 4 months ago #27587145 by cosma
Replied by cosma on topic Re:0% Deadband
The start-at-center feature can be disabled with Roborun but in your case you may get better results by making adjustments on the labview side.

The A/D converter is precise but it uses the controller's internal 5V supply as reference which may not be exactly 5V.

Measure the 5V output on Pin 14 and set your software so that you output half that voltage when idle.

The controller's 5V is quite stable so you should be able to use that value without other adjustment.

If you want to get fancy, however, you can measure the controller's 5V out on another labjack channel and compute the mid-point on the fly.

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12 years 3 months ago #27596083 by roboteq
Replied by roboteq on topic Re:0% Deadband
So it seems to be called the "power-on-safety" feature in the manual, and I can't figure out how to turn it off in Roborun 1.9b. I looked through the RS-232 controller commands in the manual, but I don't see any mention of start-at-center or power-on-safety. Forgive me if I'm unobservant, but: How do you turn that off?

Thanks.

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12 years 3 months ago #27600725 by cosma
Replied by cosma on topic Re:0% Deadband

You need to have v1.9d of the firmware and the PC utility. You may download from www.roboteq.com/doclink.html

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12 years 3 months ago #27659633 by roboteq
Replied by roboteq on topic Re:0% Deadband
Hey thanks. Updated firmware. It works now.

I was confused because many of the links on the website still mention version"1.9<i>b</i>" as the latest version, and actually my roborun utility was version 1.9d after all, and so, well, nevermind.

Actually I think I might use the RS-232 instead of Analog anyway.

thanks again.

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