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Control for fractional HP motor needed
zepfan
Member Posts: 408
Does anyone know of a control, or an Inexpensive VFD that could be used on a 115 volt 1/10 hp motor? The application is an an exhaust fan for a lab that is served by a VAV box. The board in the vav box would send a 0-10 volt signal to the exhaust fan’s control, the signal would increase as the damper in the box opens. A vfd may be the only way to go, but the fan is so small that this me be overkill. I did not know if anyone had a like experience, and what control they used for this. Thanks to all
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Is this a standard AC squirrel cage motor? If it is, the speed it runs is fixed by the frequency of the power fed to it, so a variable frequency drive is going to be the only hope. If it is the type with brushes, you might be able to control the speed by varying the voltage applied (think Lionel electric model trains!).Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
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Thanks for the responses. We have not received the motor yet and the submitalls do not state weather it is PSC, shaded pole, or ec. Normally we would use a wall mounted scr to very the speed of the fan, but that requires manual adjustment. We are looking for something that is automatic0
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Not a very big exhaust fan. If a squirrel cage fan just control a damper.0
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a trial relay might be all you need, if you have a way to send it a signal. 20 bucks or so for a small relay able to switch 1 hp or so. We added them to our solar controllers when the load exceeded 1 A.Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0
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