H - Electricity – 04 – L
Patent
H - Electricity
04
L
346/28, 340/96
H04L 5/14 (2006.01) B61L 3/00 (2006.01)
Patent
CA 1158332
(Case No. 7066) ABSTRACT OF THE DISCLOSURE A fail-safe acknowledging circuit comprising a plurality of relay switching contacts having a predetermined order of more restrictive significance. A differentiating circuit selectively interconnected by certain ones of the plurality of relay switching contacts for establishing a selected one of a plurality of charging potential levels from a d.c. voltage source. A latching circuit is conditioned by a holding voltage and is set by momentarily closure of an acknowledging switch to produce a.c. signals which are fed to one input of a two-input AND gate. A checking circuit monitors the voltage level of the d.c. voltage source and verifies the integrity of the differentiating circuit to produce a d.c. potential which is conveyed to the other input of the two-input AND gate. The output of the two-input AND gate supplied to a tome delay circuit for normally energizing a brake release relay and for deenergizing the brake release relay if the acknowledging switch is not momentarily reclosed within a given period of time after the reception of a more restrictive speed command signal.
371495
American Standard Inc.
Fetherstonhaugh & Co.
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