Quote:
Originally Posted by jam2014
On the upside, there should be huge opportunities with the new 2014 Power Distribution Board on board current monitors to detect and manage excessive power drain.
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The 2014 PDB does not have built in current monitoring. The 2015 PDP does.
Quote:
Originally Posted by jam2014
I could be wrong but last I heard, it was only on the 40amp outputs ?
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Where did you hear that? I don't believe the PDP ever had that limitation, and it certainly doesn't now.
Quote:
Originally Posted by jam2014
I am looking for some real world feedback on teams experiences using a 6 cim drive train with a 2 speed transmission designed for both low speed (4-5 ft/sec) and high speed (say 14ft/sec).
If your robot got in an extended pushing / blocking match with other 6 cim robots for a good part of a match...
- Would you be at risk of blowing the breaker ? If so, how often did you blow your breaker last year. Did you replace the breaker one or more times last year. Have you implemented any software protection (reduce power after X seconds) or hardware (fan) to defend against that ?
- how warm or hot would the following be by the end of the match
- the battery
- the terminals on the battery
- the contacts of the battery connector
- the breaker, its terminals etc
- do you guys do anything to cool the cims (fans, aerosol can cooling for example)
I have heard of a team that replaced all the 14 gauge cim wires with 10g wire. Did you guys do anything like that ?
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We ran a 6 CIM drive train, 2 speed, with theoretical speeds of ~18 ft/s and 8 ft/s. We used 8 wheel drive with versawheels. We never blew the main breaker. We played plenty of defense towards the end of the season.
We used 10 awg wire on each of the drive motors, as well as kept the wires short (PDB was mounted very near the motors). We used 4 awg wire from the battery to the breaker and PDB, but used standard 6 awg on the battery. We did not implement any software magic, but the driver new to shift to low when pushing.
Using the 2015 control system, we collected current during a match at the SCRRF fall classic. This was with rookie drivers. See
http://www.chiefdelphi.com/forums/sh...&postcount=153