SidWell Posted January 27, 2009 Share Posted January 27, 2009 Can I use the Fiddle output to drive a relay that switches on and off the radiator fans? ms 2.889 ms 225p3 v3 board Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted January 28, 2009 Share Posted January 28, 2009 Yes. With MS2 you can use the Spare Output Ports section and configure it to behave like a normal fan control. See here for details: http://www.megamanual.com/ms2/spare.htm Quote Link to comment Share on other sites More sharing options...
SidWell Posted January 30, 2009 Author Share Posted January 30, 2009 Sweet! Thanks Matt Quote Link to comment Share on other sites More sharing options...
SidWell Posted June 8, 2009 Author Share Posted June 8, 2009 I finally wired up my radiator fan to the PM2 FIdle spare port. Pin 30 is wired to the low side of of the relay coil. When power up the MS, the fan also spins up. I have followed the config instructions and have Port PM2 FIdle enabled, variable = coolant > threshold = 180, hysteresis = 10, there is no second decision set at this time. Power-on value = 0 Trigger value = 1. I have no way to shut the fans off. No changes to the configuration will shut the fans off. When I look at Pin 34 of U1, it always stays at about .1v, it never goes high. This tells me that I have an error in my config and not in my wiring. Is there a step that I am missing? Is there something else to try? Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted June 8, 2009 Share Posted June 8, 2009 It sounds more like an issue with the transistor if that measurement is right. How does the FIDLE light behave on a Stimulator when you turn the CLT trim pot? Quote Link to comment Share on other sites More sharing options...
SidWell Posted June 9, 2009 Author Share Posted June 9, 2009 The FIdle LED is always on no matter what I set in the config. Pin 34 on U1 is always low when I look at it with the o-scope. Looks like I will be buying another processor daughterboard. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted June 10, 2009 Share Posted June 10, 2009 I'd try reloading the firmware first in case it's just corrupted code. Quote Link to comment Share on other sites More sharing options...
SidWell Posted June 11, 2009 Author Share Posted June 11, 2009 I have read there may be an issue with trying to use Fidle and IAC at the same time. I have the IAC enabled. Could this be why my Fidle is not working? Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted June 12, 2009 Share Posted June 12, 2009 Depends on what IAC mode - could you post your MSQ? Quote Link to comment Share on other sites More sharing options...
SidWell Posted June 14, 2009 Author Share Posted June 14, 2009 I found the problem. First, I think I broke the daughter board myself trying to understand the initial problem. The actual problem turned out to be a jumper I placed across D8. Since that grounded pin 30 the Fidle was always on. I am sure I grounded it for a purpose when I first built the board but the reason is lost on me now. The bottom line is, it it all works now. Quote Link to comment Share on other sites More sharing options...
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