Double DC coil timing circuit

Details Double DC coil timing circuit Double DC coil timing circuit

1991-04-19

1992-12-01

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361154, 361210, 361195, H01H 4704, H01H 4706

Patent

active

051684187

ABSTRACT:
Control circuitry is disclosed for electrical starters, contactors and the like having a starting winding and a serially coupled holding winding wherein the holding winding is shorted until the separable main contacts 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 winding. 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 expensive limit switch with a substantially smaller DC capability. In alternate embodiments of the invention, control 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.

REFERENCES:
patent: 4065096 (1977-12-01), Frantz et al.
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Westinghouse Bulletin I.L. 16999D; Instructions for V201, V211 V251 320 Ampere Vacuum Contactor Nonreversing or Reversing.
Westinghouse Bulletin I.L. 17232; Instructions for Type SJA 360 Ampere, 7200 Volt Vacuum Contactor.

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