Converter In-Rush Thermistors etc, UPDATE -4
UPDATE on 17 Nov, Update 2 on 22 Nov, Update 3 on 16 Jan 14, Update 4 on 19 Oct 14. --------------- In a recent thread there was mention of how you can wreck your gizmo (in my case a converter) ...
Forum Discussion
Thanks for taking the time on that. The red-black is the fan wire. The fan only comes on when needed.
The 120 input goes to the board by that 120v glass fuse by way of a switch on the lid, so the extra wires showing are from the inside of the lid under the on/off switch. The 120v green wire goes to the inside end of the chassis by the fan. The chassis also has a ground lug at the output end of the converter that is supposed to go to trailer frame.
The discoloration on top of that heat sink (I think that's what that big thing is) is a reflection of something. It has a shiny top. There was a browned spot on the chassis end by the broken thermistor where it had burned out.
I have to take out the board to get at the underside where the thermistor's legs come out the bottom. I could not desolder and pull the old legs out, so it worked to use a 3/64 drill and make a hole for each leg in the soldered areas where the legs go. Poke the new legs through, solder them in on top and underneath, and snip off the new legs underneath and the old legs on top. Must be good work, because the unit works great after that! :) (until I do one of those hot restarts--oops)
I thought maybe we could use those energy calculations Ken did earlier and use them to do the R calculation like in the lesson plan as a WAG. The lesson plan example set-up seems not far off what my converter looks like and maybe we can just scale up the lesson plan energy to get the R value I should use?
The 120 input goes to the board by that 120v glass fuse by way of a switch on the lid, so the extra wires showing are from the inside of the lid under the on/off switch. The 120v green wire goes to the inside end of the chassis by the fan. The chassis also has a ground lug at the output end of the converter that is supposed to go to trailer frame.
The discoloration on top of that heat sink (I think that's what that big thing is) is a reflection of something. It has a shiny top. There was a browned spot on the chassis end by the broken thermistor where it had burned out.
I have to take out the board to get at the underside where the thermistor's legs come out the bottom. I could not desolder and pull the old legs out, so it worked to use a 3/64 drill and make a hole for each leg in the soldered areas where the legs go. Poke the new legs through, solder them in on top and underneath, and snip off the new legs underneath and the old legs on top. Must be good work, because the unit works great after that! :) (until I do one of those hot restarts--oops)
I thought maybe we could use those energy calculations Ken did earlier and use them to do the R calculation like in the lesson plan as a WAG. The lesson plan example set-up seems not far off what my converter looks like and maybe we can just scale up the lesson plan energy to get the R value I should use?
