tazz229 Posted September 11, 2012 Report Share Posted September 11, 2012 I'm trying to solve my burnt out rectifier problem and discovered today that the regulator wasn't connected. Now im no Einstein but I reckon that played a major part! Now to the fan... I connect it to my car batt charger and it spins. Not massively fast (but then I dunno how fast it's supposed to be) and the batt charger cuts out after a few secs because of the amount of amps it's taking to power it! Surely a car batt charger should have no trouble right? Now it's not an all singing all dancing charger just a basic one and for all I know it may only have a 3amp output It doesn't say. The fan itself spins freely by hand with no resistance at all and no noise, when it's running it's nice and quiet and there doesn't appear to be be anything wrong. Also does anyone know what amps the standard rectifiers are rated at? If I can find out what the fan is actually drawing compared to what the rectifiers are rated at then I'll know if I'm going to run into trouble if I get a new one! It's a 2001 TXT280 Quote Link to comment Share on other sites More sharing options...
copemech Posted September 12, 2012 Report Share Posted September 12, 2012 I would venture to guess the small fan motor would run at 2-4 amps, so may be to much for your small charger whis is not really designed to run things like that anyway. If your regulator was disconnected this may explain things due to over voltage. Fix that and ck to see the fan runs normally under proper voltage. Quote Link to comment Share on other sites More sharing options...
tankygsy Posted September 12, 2012 Report Share Posted September 12, 2012 Can't help with the rectifier specs but if any use to you this is the spec of my fan motor: No-load current drain 0,4 A Current drain at max. efficiency 2 A Current drain when stalled 10 A If the motor windings are shorted out / beginning to fail it will draw more current. Quote Link to comment Share on other sites More sharing options...
tankygsy Posted September 12, 2012 Report Share Posted September 12, 2012 By the way I wouldn't use your charger as a power supply as the charger will only deliver unfiltered rectified AC (aka pulsed DC) which is not the steady 12v dc that the motor needs to run properly. You might also damage your charger. Quote Link to comment Share on other sites More sharing options...
tazz229 Posted September 12, 2012 Author Report Share Posted September 12, 2012 Thanks guys I'll see if I can get the motor tested before I put a new rectifier on just to be sure... Can you confirm that the regulator wire just "piggy backs" the AC feed wire so to speak? There must be a connector missing somewhere because the plug on the regulator wire doesn't look like its been plugged into anything for quite sometime.... :/ Quote Link to comment Share on other sites More sharing options...
tankygsy Posted September 12, 2012 Report Share Posted September 12, 2012 Yes correct it does just 'piggy back'. 1 Quote Link to comment Share on other sites More sharing options...
tazz229 Posted September 12, 2012 Author Report Share Posted September 12, 2012 Ta muchly Quote Link to comment Share on other sites More sharing options...
tazz229 Posted September 14, 2012 Author Report Share Posted September 14, 2012 Tested my fan today and its at 2ohm which means its drawing 6amps. Seems an awfull lot for a small fan so, big up to the 'pinned topic' Fan motor replacement cos i reckon thats my next task! Quote Link to comment Share on other sites More sharing options...
copemech Posted September 15, 2012 Report Share Posted September 15, 2012 Tested my fan today and its at 2ohm which means its drawing 6amps. Seems an awfull lot for a small fan so, big up to the 'pinned topic' Fan motor replacement cos i reckon thats my next task! Does your DVOM not have a ammeter function that you can put it in series with a battery supply voltage to properly test it dynamically? If the thing runs at normal speed at 12V it should be fine. Quote Link to comment Share on other sites More sharing options...
tazz229 Posted September 15, 2012 Author Report Share Posted September 15, 2012 Unfortunately not no... Although it runs it seems to be quite slow, to the point where I can only just feel a draught coming fom it. Quote Link to comment Share on other sites More sharing options...
copemech Posted September 16, 2012 Report Share Posted September 16, 2012 Unfortunately not no... Although it runs it seems to be quite slow, to the point where I can only just feel a draught coming fom it. I would think a properly working fan motor with a decent power supply(not the charger) should have a good buzz to it. Possibly the overvoltage(no regulator) has overstressed the motor over time and it is sluggish. Thoughts anyway, Cheers, MC Quote Link to comment Share on other sites More sharing options...
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