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Unread 04-01-2016, 13:35
philso philso is offline
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Re: 6 CIM robo-rio brown out

Quote:
Originally Posted by GeeTwo View Post
Yes, if viewed from the standpoint of accomplishing a given task, which is how we usually consider the robot design. That is, with loose connections or long runs, you will need to draw more Amp-seconds from the battery to (for example) lift a stack of four totes by fourteen inches.
The effect of the instantaneous current draw (in Amps) is different from the effect of the state of charge of the battery (in Amp Seconds).

Brown-out and under-voltage phenomena occur when the instantaneous current draw is high enough to cause the battery output voltage to drop sufficiently low. The state of charge of the battery will determine the amount of margin that one has before brown-out and under-voltage phenomena occur. A high enough draw will cause a fully/freshly charged battery to drop low enough to cause a problem. A lower instantaneous current will cause a depleted battery to drop to the same voltage level.

The recommendations made by Joe are correct. I was questioning the reasoning given for the recommendations.

Loose connections will introduce extra series resistance leading to brown-out and under-voltage phenomena occurring at lower instantaneous current than if the connection is good. If the connection is really loose, one will get intermittent operation where the voltage drops to zero.

Reducing wire length will reduce the circuit loop resistance leading to higher maximum currents.
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