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Re: New Speed Controllers :)
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Originally Posted by Alan Anderson
The Victor 885 is intended for 24 volt applications.
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Originally Posted by Victor 885 Speed Controller Specifications
Control Signal Standard R/C Type PWM (Pulse Width Modulation)
Operating Voltage 6V to 30V (does not include the fan)
Fan Type Rotron. Battle proven by Inertia Labs (and many others).
12V Fan Voltage 6V to 16V
24V Fan Voltage 16V to 30V
Maximum Current 120A continuous
Surge Current 200A for < 2 second
300A for < 1 second
Power Connector 6-32 Screw Terminals
Signal Connector Use a standard non-shrouded PWM cable (3 wires)
Typical Application Power one motor with variable speed forward, reverse, or off
Weight 0.25 lbs
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Seems like you could use it at 12V since it's rated for operation at 6V.
Anyway, as long as we're using 40A snap action breakers on each circuit, the capability of the 885 won't be exploited. We'd get a small benefit in reduced voltage drop. For FRC use that doesn't seem worth the difference in price.
885s seem to be intended for big bots. 24V x 120A is 2880 Watts; at about 75% efficiency that would be about 3 HP at the motor shaft. Way too much power for a FIRST robot, even if we were to get motors that could handle it.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
Last edited by Richard Wallace : 03-05-2006 at 23:26.
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