I'm trying to track down a power factor controller capable of operating on 120 volts single phase. 99% of the parts available seem to be made for 208-480 volts three phase. As I understand, a three phase power factor meter will not function correctly on single phase power (Current sensing is typically done on L1 and voltage input is taken across L2 and L3 if memory serves).
All I need is some kind of a solution to cut in and cut out some capacitors in response to changes in power factor. I've got some machines in the garage and the ancient motors in them exhibit horrific power factor under light loads (COS φ = 0.3-0.35). This means I end up paying for 3 times more energy than I am actually using.
My original plan was to just correct each machine individually in some fashion (easy), but then I got to thinking about all the other equipment that gets plugged and un-plugged down there from time to time and figured it might be worth a stab to just put together an "autovar" type system.
My question is: Is there an easy/cost effective way of going about this, either with store-bought components or home-brew circuitry, or should I just save myself the trouble and stick with the tried-and-true technique of installing an individual cap bank on the load side of the drum switch for each machine?
Thanks.
All I need is some kind of a solution to cut in and cut out some capacitors in response to changes in power factor. I've got some machines in the garage and the ancient motors in them exhibit horrific power factor under light loads (COS φ = 0.3-0.35). This means I end up paying for 3 times more energy than I am actually using.
My original plan was to just correct each machine individually in some fashion (easy), but then I got to thinking about all the other equipment that gets plugged and un-plugged down there from time to time and figured it might be worth a stab to just put together an "autovar" type system.
My question is: Is there an easy/cost effective way of going about this, either with store-bought components or home-brew circuitry, or should I just save myself the trouble and stick with the tried-and-true technique of installing an individual cap bank on the load side of the drum switch for each machine?
Thanks.
Last edited: