Method of semiautomatic ambient light sensor calibration in an automatic control system
First Claim
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1. A method of calibrating a dimmable lighting system, having an electric lighting fixture, or ambient light sensor, an electronic controller and a programmer for controlling a feedback loop between said ambient light sensor and said electronic controller, comprising the steps of:
- adjusting an output level of an electric lighting fixture in a workspace to a minimum and adjusting an outdoor light level in the workspace to a minimum;
sensing and recording a first illumination level at an ambient light sensor and a first illumination level at a lighting point of interest;
adjusting the output level of the electric lighting fixture to a maximum;
sensing and recording a second illumination level at said ambient light sensor and a second illumination level at said lighting point of interest;
adjusting said outdoor light level to a maximum and adjusting said electric lighting fixture output level to a minimum;
sensing and recording a third illumination level at the ambient light sensor and a third illumination level at the lighting point of interest;
adjusting said output level of said electric lighting fixture to a maximum while holding said outdoor light level at a maximum;
sensing and recording a fourth illumination level at the ambient light sensor and a fourth illumination level at the lighting point of interest;
calculating a gain value and a setpoint value for said dimmable lighting system from the eight sensed illumination levels and a predetermined illumination level at the lighting point of interest;
communicating the gain value and the setpoint value to the electronic controller of the dimmable lighting system, said electronic controller utilized to control an electrical input to the electric lighting fixture.
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Abstract
A method of calibrating a dimmable lighting system having an electric lighting fixture and light sensor in an electronic controller. The method comprises a system which makes eight measurements while controlling illumination levels from both indoor and outdoor lighting. The method calculates a set point and a gain which are utilized to maintain a constant lighting level at a lighting point of interest.
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Citations
9 Claims
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1. A method of calibrating a dimmable lighting system, having an electric lighting fixture, or ambient light sensor, an electronic controller and a programmer for controlling a feedback loop between said ambient light sensor and said electronic controller, comprising the steps of:
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adjusting an output level of an electric lighting fixture in a workspace to a minimum and adjusting an outdoor light level in the workspace to a minimum; sensing and recording a first illumination level at an ambient light sensor and a first illumination level at a lighting point of interest; adjusting the output level of the electric lighting fixture to a maximum; sensing and recording a second illumination level at said ambient light sensor and a second illumination level at said lighting point of interest; adjusting said outdoor light level to a maximum and adjusting said electric lighting fixture output level to a minimum; sensing and recording a third illumination level at the ambient light sensor and a third illumination level at the lighting point of interest; adjusting said output level of said electric lighting fixture to a maximum while holding said outdoor light level at a maximum; sensing and recording a fourth illumination level at the ambient light sensor and a fourth illumination level at the lighting point of interest; calculating a gain value and a setpoint value for said dimmable lighting system from the eight sensed illumination levels and a predetermined illumination level at the lighting point of interest; communicating the gain value and the setpoint value to the electronic controller of the dimmable lighting system, said electronic controller utilized to control an electrical input to the electric lighting fixture. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of calibrating a dimmable lighting system wherein said lighting system comprises a programmer for controlling a feedback loop between an ambient light sensor and an electronic controller, comprising the steps of:
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adjusting an output level of an electric lighting fixture in a workspace to a minimum and adjusting an outdoor light level in the workspace to a minimum; sensing and recording a first illumination level ES1 at an ambient light sensor and a first illumination level EW1 at a lighting point of interest; adjusting the output level of the electric lighting fixture to a maximum EPM ; sensing and recording a second illumination level ES2 at the ambient light sensor and a second illumination level EW2 at the lighting point of interest; adjusting the outdoor light level to a maximum and adjusting the electric lighting fixture output level to a minimum; sensing and recording a third illumination level ES3 at the ambient light sensor and a third illumination level EW3 at the lighting point of interest; adjusting the output level of the electric lighting fixture to a maximum while holding the outdoor light level at a maximum; sensing and recording a fourth illumination level ES4 at the ambient light sensor and a fourth illumination level EW4 at the lighting point of interest; calculating a gain value and a setpoint value for the dimmable lighting system from the eight sensed illumination levels and a predetermined illumination level EW0 at the lighting point of interest; whereby the gain value is determined from the equation;
space="preserve" listing-type="equation">G= E.sub.PM /(E.sub.W2 -E.sub.W1)!* E.sub.W3 /E.sub.S3 !;and the setpoint value is determined from the equation;
space="preserve" listing-type="equation">P={E.sub.W0 * 1+(E.sub.S1 /E.sub.W1 * (E.sub.W3 /E.sub.S3)!-E.sub.W1 }/(E.sub.W3 /E.sub.S3);communicating the gain value and the setpoint value to the electronic controller of the dimmable lighting system, said electronic controller utilized to control an electrical input to the electric lighting fixture. - View Dependent Claims (8, 9)
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Specification