Double dc coil timing circuit

Details Double dc coil timing circuit Double dc coil timing circuit

H - Electricity

02

P

H02P 1/10 (2006.01) H01H 47/06 (2006.01)

Patent

CA 2066357

Abstract of the Disclosure Control circuitry is disclosed for electrical starters, contactors and the like having a starting wind- ing and a serially coupled holding winding wherein the holding winding is shorted until the separable main con- tacts have closed which includes circuitry which obviates the need for relatively precise sensing of the position of the separable main contacts to control the holding wind- ing. In one embodiment of the invention, the unshorting of the holding winding is delayed a predetermined number of cycles after the separable main contacts have closed to avoid the necessity of relatively accurate mechanical sensing of the position of the separable main contacts. In this embodiment a relatively less expensive field effect transistor or the like is used to short out the holding winding until the separable main contacts have closed. This allows the use of a relatively less expen- sive limit switch with a substantially smaller DC cap- ability. In alternate embodiments of the invention, con- trol circuits are provided which allow the limit switch normally used for sensing the position of the separable main contacts, to be eliminated altogether, thus further reducing the cost of the device as well as the labor cost involved for adjustment of the limit switch.

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