×

Photocontroller diagnostic system

  • US 6,452,339 B1
  • Filed: 12/15/1999
  • Issued: 09/17/2002
  • Est. Priority Date: 08/19/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. An electrical system, comprising:

  • an electrically activated device;

    a photocell for detecting ambient light conditions and for generating a photocell signal that varies with a magnitude of ambient light;

    a relay for selectively providing power to the electrically activated device upon receipt of a control signal; and

    a processor for receiving the photocell signal and for generating the control signal when the magnitude of the photocell signal is at a first level;

    the processor for monitoring the power being provided to the electrically activated device;

    wherein the processor determines that the relay is faulty when power is being provided to the electrically activated device while the magnitude of the photocell signal is at a second level, the second level being different than the first level.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×