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DE | Have 36" three blade direct drive fan in wooden box frame powered by Dayton 1/2 hp 850 rpm teao fan motor that sits right outside of cow stable door on ground where we milk for years with no problems. Rain and wind storm came up and blew fan over backwards, no visible damage. Fan would only run up to about 1/3 normal speed and over heat. Took access plate off, no burning smell or burnt wires. Changed start capacitor, no difference. Went and got new identical Dayton motor. Would run for about 20 minutes, over heat and stop. Took it back and got another motor, it ran about 50 minutes and over heated and stopped. The fan blade hub is pretty darn stout, don't see how anything can be bent simply falling over backwards, fan runs without any noticeable vibration. What gives? any ideas? I've read on here on where today's motors just don't have the power rating like older ones. It's wired for 220. Went and got cousins 48" two blade fan that he no longer uses, 1 hp 220v direct drive fan plugged in same receptacle and works fine. I've looked quickly for 3/4 hp motor but can't find a 850 rpm or one that has same frame size that will bolt up to the two angle iron that supports motor.
should add, the two replacement motors would get up to rated speed but you could tell they were struggling a bit to hold the rpm.
Edited by cowhater 7/23/2011 13:59
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Faunsdale, AL | Check voltage at the motor while it's running. See if somehow you have a bad connection somewhere so the voltage is dropping to below 200 volts or so under load. Many motors are rated 208-230 to operate on voltages anywhere from ~200 to 260 volts without problems.
Also check the reconnection jumpers in the motor. Perhaps you don't understand how the little tiny diagram indicates to connect the leads. A rule of thumb......when you supply half the voltage, a motor delivers about 1/4 the horsepower it is supposed to..........IF it can even start the load!
Be sure to check rpm of the replacement motors. Could be mislabeled? After all, an 850 is definitely an odball motor in the whole range of motors out there and likely being made in China now, sometimes things get lost in translation. Got a tachometer you can check it with?
Reason the rpm is so important is when you double the rpm, you quadruple the hp required, so a 1100 rpm motor would have to be 1 hp and a 1750 would have to be 2 hp to run that same blade. Just as an example we have an old fan I got used out of a factory. It had a 5hp 3500 rpm motor on it and would almost blow you over if you stood in front of it. Motor burned up after several years and I didn't have another one, so we put a 1.5 hp 1750 rpm on with the same pulley as the old one. Runs right on the amperage it's supposed to and moves plenty of air for where we have it.
I have a few Dayton fans like yours which we have had for a long time. They have been very reliable. Got some of another brand (4 strip steel blades) that are 20+ years old and still going strong. Shed they were in got blown down by tornado this spring. Pulled fans out, strightened up sheetmetal as needed and reinstalled them in new shed. Still going strong!
Have a lot of Shaeffer fans with the white plastic guards on them. Haven't lasted anywhere near as long. Seems like they just can't stand the "normal" thunderstorm jolts we get around here. Had both single and 3ph Shaeffers. 3 phase seems not to help reliability in the small fans like I thought it would, or mayb that's just the Shaeffers :>)
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nw pa | do these motors come with new cords. If you use the same cord it could have been pulled when it fell and broke a wire inside. |
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DE | no, they don't. But there was PLENTY of slack on the cord, don't see how it could possibly stretch or break a wire. If a wire was broke, it wouldn't run. Maybe if it somehow stretched and frayed a few strands, but again, I don't see that could be the case although stranger things have happened for sure. |
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| Try blocking part of the intake side off, possibly moving to much air and needs to be restricted. |
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nw pa | it would try to run on 110 if grounded |
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DE | nt |
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anybody else having problems with Dayton electric fan motors?
