NSR250.net Forums Logo: Honda NSR 250 Forums, Classifieds and Service Manual in English. Covering All Honda NSR 250 MC16, MC18, MC21 and MC28 models
NSR250.net Forums

#
 
#
 
Performance Engineering

  • NSR250 Forums Index ‹
  • Members Content
  • Members Garage
  • Subscription
  • Transactions
  • FAQ
  • Search
  • Register
  • Log in

View Single Post


 Topic: PGM3 







pbekkerh

 
    Send private message View user's profile
    Reply with quote

pbekkerh » Thu Jul 01, 2010 10:40 am

I've done a little research.

the current when the valve servo hitīs the stop is 780mA and the FET transistor is rated at 5A, so it looks like the transistors are burnt because of a sustained high current which, over time, heats them up so they burn.

If this is the case, then a fuse could be usefull.

I've also tried a small bulb in series, as its very low resistance when cold, at low current, but at higher current it heats up and the resistance increases, so it acts as a current limiter and you get a bonus, as the bulb will light up when the servo is drawing excess current.
The bulb I'm using, limits the max. current to 170mA which is a factor 4. This could be enough to protect the transistors of the PGM

The resistance at low current makes the servo go a little slower but I don't know if this will be a problem when running the bike.

I still need to know the running current of the servo, also the output voltages from the PGM and the schematic of the transistor circuit if anyone has it ?
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom
Back to top

  • NSR250 Forums Index
  • All times are GMT
Powered by phpBB © 2001, 2005 phpBB Group


Hosted by NSR250dotNET © 2008 NSR250dotNET