Quote:
Originally Posted by Mike Copioli
The Spike has a suppression diode at the motor terminals. This diode clamps the inductive flyback that happens during both the freewheeling period and direction changes.
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Mike, thanks for the reference to PDP documentation -- it is well presented and definitely worth reading through by all interested FRC participants who work with the control system. Students, mentors, robot inspectors, CSAs, FTAs, etc. The new control system is a wonderful advance over what we've used before.
Since you have some detailed knowledge of the Spike relay that is not mentioned in
its doc, can you tell us a little more about the suppression diode at its M+, M- terminals? I'd be interested in several of the specs for that diode, including leakage current, reverse voltage (clamping, avalanche, standoff, etc.), parasitic capacitance and inductance, energy ratings (single and repetitive), and anything else you know of that is pertinent to the protection it can offer against recovery voltage spikes produced when the Spike interrupts current to an inductive load. If those specs are not easily available to you, but you do have an example part to look at (outside of its case), can you tell us the manufacturer's part number of that suppression diode?
Thanks again for sharing detailed knowledge of FRC control system components.
__________________
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)