For those of you who run your DC fans for 24/7, does your adaptor have burn marks ? What brand of adaptor are you using ?
Last nite I disconnected my adaptor from the timer to allow the fans to run 24/7. Shocked to find that the heat generated by the transformer had caused the plastic casing to turn brown and slightly melted[:0] And this is only running at 11hrs/day. Now I'm worried to let it run 24/7, might cause an electrical fire while I'm at work []
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Hmmm... does your AC/DC adaptor have the correct ampherage?
Eg. if you have 3 fans rated at 0.3A, then your adaptor should be rated for 1A (1000mA) or higher, else the unit will run too hot.
i.e. total fan ampherage must be less then or equal to adaptor ampherage.
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Will check it out. Thanks for the advice.----------------
On 11/13/2002 4:52:11 PM
Hmmm... does your AC/DC adaptor have the correct ampherage?
Eg. if you have 3 fans rated at 0.3A, then your adaptor should be rated for 1A (1000mA) or higher, else the unit will run too hot.
i.e. total fan ampherage must be less then or equal to adaptor ampherage.
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how many fans are you running?----------------
On 11/13/2002 4:45:54 PM
For those of you who run your DC fans for 24/7, does your adaptor have burn marks ? What brand of adaptor are you using ?
Last nite I disconnected my adaptor from the timer to allow the fans to run 24/7. Shocked to find that the heat generated by the transformer had caused the plastic casing to turn brown and slightly melted[:0] And this is only running at 11hrs/day. Now I'm worried to let it run 24/7, might cause an electrical fire while I'm at work [
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i don't think the heat from the transformer melted your plastic casing. most likely culprit is the thermal fuse in adapter. thermal fuse is designed to break when the current use exceeds a certain value. for your case, it is highly likely that the adapter is operating very close to the limit.
do as Vinz as suggested, check the current rating of the adapter.
when an adapter is rated 12v 500ma, it means that the adapter will output 12v when it is supplying 500ma. if less current is used the voltage will be higher than 12v and could go as high as 18v. however if current drawn is higher that 500ma, then the voltage will be less than 12v. the thermal fuse is the only protection.
an alternative to adapter, you can use a adapter used for notebook/laptop. these are excellent as they are designed to work for extended hours while supplying in excess of 2000-3000ma. a 2000ma adapter will allow at least 12 fans to operate simultaneously. no problem with safety or fire risk if you choose adapters that have a number of safety/approval mark from various countries.
i am running 4 dc fans from a notebook adapter which output 18.5v.
thomas liew
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