Solid State relay kills induction motor fans
On Tuesday, July 28, 2015 at 3:15:20 AM UTC-4, N_Cook wrote:
On 28/07/2015 03:06, Deane Williams wrote:
I set up a thermostat in my garage that comes on at 80 degrees F. and sends a 6 VDC battery voltage to control a 120 VAC solid state relay which powers up the vent fan. The fans always quit within 2 months to a year with no obvious defects. These are inexpensive 20 inch box fans with induction motors. I have tried several brands and styles of fans. The latest was a Home Depot unit that only lasted 2 months.
Does anyone know of a reason why I can't run an induction motor from a SS relay? What is killing the fans? I have taken two apart and there is no smoke smell, no visible damage and if there is a capacitor it tests OK..
Thanks for any ideas. I am going to switch over to a mechanical relay.
Dean
Do you do TIG/MIG welding in this garage?
No. I don't own a TIG/MIG welder.
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