RPMS Posted October 7, 2003 Share Posted October 7, 2003 Dan Juday said in an earlier post that having both the low and high speed wires simultaneously energized would damage a Taurus fan. Every wiring diagram I'm seeing seems to fire both relays on high speed, energizing both the high and low speed windings. See this diagram... What do y'all think? Quote Link to comment Share on other sites More sharing options...
Guest zbot43 Posted October 7, 2003 Share Posted October 7, 2003 Where did you get that wiring schematic? I am in the middle of doing the same thing, using a two speed Ford Taurus Fan. I would tend to think that it is wrong, but please someone correct me if I am wrong. You should apply power to the hi speed or the low speed tap, but not both at the same time. Most of the diagrams I have seen show two relays hooked up in series where the first is used to turn on or off, and the second is used to decide which tap is used the hi, or the low. Quote Link to comment Share on other sites More sharing options...
mas28O Posted October 7, 2003 Share Posted October 7, 2003 I have mine set to give power to one winding at a time. I love the Taurus fan my car never gets over 185. Quote Link to comment Share on other sites More sharing options...
RPMS Posted October 7, 2003 Author Share Posted October 7, 2003 That schematic is the one being widely distributed on the internet. Do a Google search for (taurus fan diagram) and you'll come up with several dozen links to it. Of course, just because it's on the net doesn't mean that it's right! I don't want to burn this puppy out, but at the same time I don't want to spend more than I have to out of ignorance. Nothing chaps my ass more than spending $40, only to find later that if I'd done my homework I could have spent $10. Does anyone on this list work with electric motors like this for a living? With 5000 members (100 of which regularly post) surely we must have an authority lurking around SOMEWHERE! Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted October 7, 2003 Share Posted October 7, 2003 I see a little problem with the two speed diagram above. The low speed circuit comes on with 12V key switched power. The high speed comes on with either the temperature probe or the AC signal. Why have the low speed on all the time? Not necessary and could lead to premature motor failure. Also having both windings energized is not necessary. Not sure if it is damaging, but mine worked fine with only one winding energized at a time. Here is my diagram: http://home.earthlink.net/~dvgreimann/largeimages/Zcar_Fan_wiring.pdf Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted October 7, 2003 Share Posted October 7, 2003 zbot is correct, that diagram is wrong. The motor will run with both winding energized. It wont run any faster but it will run hotter. Heat is what kills electric motors. The horse power ratings on electric motors are directly tied to the heat they are safely able to run at. You don't need to spend any more money to wire it up correctly. Both ways require two relays. I don't know how long the motor will last with both circuits energized, I'm not willing to test it with my motor, but it will certainly be less than if you wire it correctly. Quote Link to comment Share on other sites More sharing options...
RPMS Posted October 7, 2003 Author Share Posted October 7, 2003 Dave, I see where you're coming from. Your system only turns on the fan when the water reaches a certain temperature, and the driver has control over whether it runs at high or low speed. It's a good system. Dan, you're right. I didn't realize that the relays I had contained both NC and NO terminals. I'll use one of them to pull power away from the low speed when high speed is activated. Thanks! Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted October 7, 2003 Share Posted October 7, 2003 You will eventually hurt the fan by energizing both windings. They will fight each other, causing heat, and it probably will not run as fast as with just the high speed winding. Quote Link to comment Share on other sites More sharing options...
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