摘要:
A diagnostic system and a diagnostic method for a thermistor amplifier circuit are provided. The system includes a transistor electrically coupled to a controllable variable resistor having a predetermined resistance. The transistor applies a test voltage signal to the circuit indicative of a first temperature value. An amplitude of the test voltage value is indicative of a simulated thermistor temperature value. The microprocessor determines a test temperature value based on the amplitude of an output voltage of the circuit. The microprocessor also determines an inaccuracy value based on the test temperature value and the simulated thermistor temperature value.
摘要:
A diagnostic system and a diagnostic method for a thermistor amplifier circuit are provided. The system includes a transistor electrically coupled to a controllable variable resistor having a predetermined resistance. The transistor applies a test voltage signal to the circuit indicative of a first temperature value. An amplitude of the test voltage value is indicative of a simulated thermistor temperature value. The microprocessor determines a test temperature value based on the amplitude of an output voltage of the circuit. The microprocessor also determines an inaccuracy value based on the test temperature value and the simulated thermistor temperature value.
摘要:
A method for operating a controller includes receiving a first accumulated thermal value of an electrical machine and an associated first time stamp from a memory, initializing a processor of the controller with the first accumulated thermal value and the associated first time stamp, determining whether a second time stamp has been received, calculating a difference between the second time stamp and the first time stamp responsive to determining that the second time stamp has been received, calculating a second accumulated thermal value as a function of the first accumulated thermal value, the first time stamp, and the second time stamp, and updating the first accumulated thermal value with the second accumulated thermal value.
摘要:
An electronic control for a circuit breaker with automatic breaker rating is disclosed. The electronic control includes a memory to store circuit breaker ratings, a breaker rating switch to select circuit breaker ratings, and a microprocessor operatively coupled to the breaker rating switch and the memory. The microprocessor is configured to interpret a selected circuit breaker rating of the breaker rating switch, set an amplifier gain adjustment for the circuit breaker based on the selected circuit breaker rating, and transmit the selected circuit breaker rating to the memory for storage in the memory.
摘要:
A method for operating a controller includes receiving a first accumulated thermal value of an electrical machine and an associated first time stamp from a memory, initializing a processor of the controller with the first accumulated thermal value and the associated first time stamp, determining whether a second time stamp has been received, calculating a difference between the second time stamp and the first time stamp responsive to determining that the second time stamp has been received, calculating a second accumulated thermal value as a function of the first accumulated thermal value, the first time stamp, and the second time stamp, and updating the first accumulated thermal value with the second accumulated thermal value.
摘要:
An electronic control for a circuit breaker with automatic breaker rating is disclosed. The electronic control includes a memory to store circuit breaker ratings, a breaker rating switch to select circuit breaker ratings, and a microprocessor operatively coupled to the breaker rating switch and the memory. The microprocessor is configured to interpret a selected circuit breaker rating of the breaker rating switch, set an amplifier gain adjustment for the circuit breaker based on the selected circuit breaker rating, and transmit the selected circuit breaker rating to the memory for storage in the memory.
摘要:
A system for controlling power in a circuit breaker trip unit is disclosed. The system includes: a user interface operably coupled to the trip unit and having a plurality of input keys; a power conditioner operably coupled to the user interface and operably coupled to a battery power source and an external power source; and a power control circuit. The power control circuit is configured to automatically electrically connect the battery power source to the power conditioner in response to activation of any of the plurality of input keys, and in the absence of an electrical connection between the external power source and the power conditioner.
摘要:
A method and apparatus providing automatic circuit breaker identification to an electronic trip unit includes a processor and a configuration module comprising configuration data identifying the particulars of a circuit breaker and that is in operable communication with the processor.
摘要:
A method of setting a ground fault trip response function for a trip unit includes enabling a ground fault protection mode for the trip unit, setting the ground fault trip response function for the trip unit, wherein the ground fault trip response function is a double knee time current function.
摘要:
A circuit breaker system and method having zone selective interlock features is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event a first or second fault condition is detected. The upstream circuit breaker upon receipt of this signal changes the response of the second circuit breaker depending on whether the first or second fault condition has been detected.