Bad ground and reverse polarity detection for HVAC controls
First Claim
1. An HVAC control comprising:
- an analog input configured to receive an analog signal; and
an error indicator;
the HVAC control configured to receive a neutral signal at the analog input, to measure a voltage of the neutral signal with respect to earth ground, to operate the error indicator to provide a first indicator status indicative of a bad ground state if the voltage is between a first voltage threshold and a second voltage threshold, and to operate the error indicator to provide a second indicator status of a reverse polarity state if the voltage is above the second threshold;
wherein the first voltage threshold and the second voltage threshold are different, and wherein the first indicator status and the second indicator status are different.
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Accused Products
Abstract
In exemplary embodiments, HVAC controls and corresponding error detection methods are disclosed. In an exemplary embodiment, an HVAC control generally includes an analog input configured to receive an analog signal, and an error indicator. The control is configured to receive a neutral signal at the analog input, measure a voltage of the neutral signal with respect to earth ground, to operate the error indicator to provide a first indicator status indicative of a bad ground state if the voltage is between a first voltage threshold and a second voltage threshold, and to operate the error indicator to provide a second indicator status of a reverse polarity state if the voltage is above the second threshold. The HVAC control may include at least four different indicator statuses. The HVAC control may include a comparator.
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Citations
20 Claims
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1. An HVAC control comprising:
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an analog input configured to receive an analog signal; and an error indicator; the HVAC control configured to receive a neutral signal at the analog input, to measure a voltage of the neutral signal with respect to earth ground, to operate the error indicator to provide a first indicator status indicative of a bad ground state if the voltage is between a first voltage threshold and a second voltage threshold, and to operate the error indicator to provide a second indicator status of a reverse polarity state if the voltage is above the second threshold; wherein the first voltage threshold and the second voltage threshold are different, and wherein the first indicator status and the second indicator status are different. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An HVAC control comprising:
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an analog input configured to receive an analog signal; and an error indicator having a plurality of different indicator status values; the HVAC control configured to; receive a neutral signal at the analog input; measure a voltage of the neutral signal; and operate the error indicator to provide a corresponding one of the plurality of different indicator status values based on the measured voltage of the neutral signal, wherein each of the plurality of indicator status values corresponds to a different measured neutral signal voltage range, and the plurality of indicator status values includes at least four indicator status values. - View Dependent Claims (9, 10, 11, 12)
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13. An HVAC control comprising:
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an analog input configured to receive an analog signal; a comparator coupled to the analog input to receive the analog signal, the comparator having an output; and an error indicator; wherein the comparator is configured to receive a neutral signal at the analog input, compare the neutral signal voltage to a voltage threshold, and output a signal indicative of a bad ground state and/or a reverse polarity state when the neutral signal voltage exceeds the voltage threshold, and the error indicator configured to provide an indicator status indicative of a bad ground state and/or a reverse polarity state based on the output signal from the comparator. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification