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Unread 30-01-2013, 00:13
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Ken Streeter Ken Streeter is offline
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FRC #1519 (Mechanical Mayhem)
Team Role: Engineer
 
Join Date: Feb 2005
Rookie Year: 2005
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Re: Reasoning for R44

Quote:
Originally Posted by R44
The wireless bridge power feed must be supplied by the 12VDC-to-5VDC converter (P/N: CLL25-24S05) connected to the marked 12VDC supply terminals at the end of the PD Board (i.e. the terminals located between the indicator LEDs, and not the main WAGO connectors along the sides of the PD Board) shown in Figure 4?8. No other electrical load may be connected to these terminals.
Quote:
Originally Posted by CrazyRussian96 View Post
What exactly is the reasoning for the first part of rule R44 in the Game Manual?
The special 12VDC supply on the Power Distribution Board is a "boost" supply, which will supply 12V even when the battery voltage falls way below 12V. For more information, see the PDB spec sheet at http://www.usfirst.org/sites/default...on%20Board.pdf

From looking at the specs, it appears that 11V will be guaranteed from the "boost" supply even if the PDB input voltage (the battery) falls all the way down to 4.5V.

The boost supply is important for the wireless bridge, because it prevents the wireless bridge from rebooting (which takes about a minute) every time the robot suddenly draws a huge rush of current (say due to a pushing match) which could temporarily drop the voltage to well below 12V.
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Ken Streeter - Team 1519 - Mechanical Mayhem (Milford Area Youth Homeschoolers Enriching Minds)
2015 NE District Winners with 195 & 2067, 125 & 1786, 230 & 4908, and 95 & 1307
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