|
Post by Adam D. on Oct 11, 2013 20:38:24 GMT -5
I'm getting this from, I've seen the original pot in dozens of fans. Your electronics guy should be able to tell the wattage of the original pot . . . anything larger than 1 watt would be SIGNIFICANTlY larger. Even 1 watt would be larger than the original. The four diodes convert AC to DC. The "converter chip" you reference is actually an MOV. Not necessarily.. The 5 watt pots I have are much smaller than the 2 watt pot. The diodes take the role of rectification in that circuit, same thing. The chip he mentioned takes part of ac/dc conversion also, and also is a Varistor that protects the circuit.. at least that's what he said, I think.... To know this circuit "complete" an actual schematic is needed.. Other than that, it's only a guessing game that we are all going by..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 12, 2013 6:45:18 GMT -5
I have a schematic on my old computer.
|
|
|
Post by Adam D. on Oct 12, 2013 11:51:35 GMT -5
If you could share it, it would be very helpful..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 12, 2013 18:27:20 GMT -5
Gotta find my external hard drive.
It's not that hard to draw one yourself from the circuit.
|
|
|
Post by Adam D. on Oct 12, 2013 18:30:50 GMT -5
Ya but it's good to have one from the manufacturer, it would list all values and specs needed for the circuit to work properly..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 12, 2013 22:36:09 GMT -5
|
|
|
Post by John Shelley on Oct 14, 2013 10:52:45 GMT -5
I drew it up back when i rebuilt one also
|
|
|
Post by Adam D. on Oct 20, 2013 19:13:17 GMT -5
Nice diagrams.. But still no one knows for sure what the specs are on the potentiometer control.. I'm not even sure if 5k is even what they used.. I still have some suspicious feeling that they could have been a custom control made for Casablanca.. I ordered up a 7.5k 25watt rheostat and see if I can get a nice slow speed without it stalling.. 5k gives slowest a too fast of a slow speed, and 10k stalls it.. I'll run it for a whole week on slow nonstop in the sizzling hot garage which gets over 100° during the day, and if nothing burns out, I'll call the problem "Fixed"..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 20, 2013 19:35:18 GMT -5
It was 5k 1/2 watt in all the fans I've worked on . . . feel free to call Casablanca and ask them.
|
|
|
Post by Adam D. on Oct 20, 2013 20:00:44 GMT -5
Hmmm.. Thats a good idea.. I'll make sure to speak with someone whose been with them for years..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 20, 2013 20:09:35 GMT -5
If it doesnt go slow enough on low with a 5k, something else is wrong. Unless you have the blue board version.
|
|
|
Post by Adam D. on Oct 21, 2013 16:16:01 GMT -5
I just got off the phone with a local Casablanca service man who has been servicing them for 40 years.. He knows that the pots are 5k, but didn't know the exact wattage on the pots but he said to replace the rectifier diodes on the board.. That's what is causing the pot to burn out.. I mentioned to him about a collector saying that he had one of his fans brought to an engineer and that everything was replaced and still problems happened.. He said that the motors on these things could possibly develop a short in the windings (Even though motor shows no symptoms and appears to work fine) and start to draw more current, burning out components on the PC board..
I kinda had a feeling that windings in the motor could cause the PC board to burn up in some cases.. I didn't mention it because I wasn't sure...
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 21, 2013 17:41:47 GMT -5
What he's saying about the windings isnt true, but what he's saying about the diodes could be. I dont think I've ever replaced all four diodes at the same time. Worth a try.
|
|
|
Post by Adam D. on Oct 21, 2013 17:56:20 GMT -5
So are you saying what a Casablanca authorized service tech said about the windings isn't true? I was referring to your earlier post in this thread in reference to having one sent to an electrical engineer...
Might be that all diodes aren't bad, but might as well replace them all..
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 21, 2013 21:07:21 GMT -5
I sure am. It sounds like he didnt know either, and was making something up.
For the motor windings to short to the point where they draw noticeably more current, the motor would run noticeably slower, and, over time, noticeably smoke.
|
|