A method for detecting faulty operation of a gas blower driven by an electronically commutated DC motor. The DC motor of the gas blower is controlled by an integrated electronic motor control circuit. The electrical current draw, required in operation to reach a predetermined blower speed of the gas blower, is measured. It is measured as a measured variable via the electronic motor control circuit. The electronic motor control circuit performs a plausibility check of the measured electrical current draw. The measured value of the electrical current draw, at a predetermined blower speed, is compared to a current draw reference value characteristic stored in the electronic motor control circuit. Thus, a warning and/or an error code is issued by the electronic motor control circuit. The warning is based on deviation of the measured value of the electrical current draw beyond a tolerance range around the reference characteristic.

A method for detecting faulty operation of a gas blower driven by an electronically commutated DC motor. The DC motor of the gas blower is controlled by an integrated electronic motor control circuit. The electrical current draw, required in operation to reach a predetermined blower speed of the gas blower, is measured. It is measured as a measured variable via the electronic motor control circuit. The electronic motor control circuit performs a plausibility check of the measured electrical current draw. The measured value of the electrical current draw, at a predetermined blower speed, is compared to a current draw reference value characteristic stored in the electronic motor control circuit. Thus, a warning and/or an error code is issued by the electronic motor control circuit. The warning is based on deviation of the measured value of the electrical current draw beyond a tolerance range around the reference characteristic.

A fault monitoring method is executed by a monitoring device in a fault monitoring system that includes a terminal used by a user, an appliance to be operated by the user, the monitoring device, and a plurality of authentication servers each including a distributed ledger, and includes: obtaining event information stored in the plurality of authentication servers and indicating an event generated in response to a request that includes a processing instruction for the user operating the appliance; obtaining state information indicating whether the appliance is faulty, from the appliance; generating first transaction data including the state information obtained and transmitting the first transaction data to the plurality of authentication servers; and transmitting the processing instruction included in the event information to the appliance, when the appliance is determined to be not faulty from the state information.

A fan fault detection device includes: a plurality of sub-modules; and a master module to configured to determine faults of a plurality of fans, wherein each of the plurality of sub-modules includes: a first input terminal for receiving a detection signal indicating whether a corresponding fan is defective; a second input terminal; an output terminal; a switching circuit connected between the output terminal and a first power source for supplying a voltage signal corresponding to a state signal and, the switching circuit configured to switch an output of the state signal through the output terminal according to the detection signal; and a first signal transmission circuit connected between the first input terminal and the switching circuit, the first signal transmission circuit configured to transmit the detection signal to the switching circuit according to a signal received by the second input terminal.

A fan fault detection device includes: a plurality of sub-modules; and a master module to configured to determine faults of a plurality of fans, wherein each of the plurality of sub-modules includes: a first input terminal for receiving a detection signal indicating whether a corresponding fan is defective; a second input terminal; an output terminal; a switching circuit connected between the output terminal and a first power source for supplying a voltage signal corresponding to a state signal and, the switching circuit configured to switch an output of the state signal through the output terminal according to the detection signal; and a first signal transmission circuit connected between the first input terminal and the switching circuit, the first signal transmission circuit configured to transmit the detection signal to the switching circuit according to a signal received by the second input terminal.

A switching amplifier includes: a driver circuit with differential inputs and differential outputs; and a fault detection circuit coupled to the differential outputs. The fault detection circuit includes: a power supply input; and a sense circuit coupled to the differential outputs. The sense circuit includes: a first resistor between the power supply input and a positive output of the differential outputs; a second resistor between the positive output and ground; a third resistor between the power supply input and a negative output of the differential outputs; and a fourth resistor between the negative output and ground. The fault detection circuit also includes an analyzer circuit coupled to the sense circuit and configured to determine a fault location relative to the differential outputs based on an output of the sense circuit.

A switching amplifier includes: a driver circuit with differential inputs and differential outputs; and a fault detection circuit coupled to the differential outputs. The fault detection circuit includes: a power supply input; and a sense circuit coupled to the differential outputs. The sense circuit includes: a first resistor between the power supply input and a positive output of the differential outputs; a second resistor between the positive output and ground; a third resistor between the power supply input and a negative output of the differential outputs; and a fourth resistor between the negative output and ground. The fault detection circuit also includes an analyzer circuit coupled to the sense circuit and configured to determine a fault location relative to the differential outputs based on an output of the sense circuit.

Embodiments described herein relate to signal generators, systems including signal generators, and related methods. A signal generator includes capacitor(s) to store energy used to generate a treatment signal. The signal generator also includes a waveform shaping circuit, a controller, a voltage sense circuit, and a current sense circuit. The waveform shaping circuit is coupled to the capacitor(s) and includes first, second, third, and fourth switches, each of which is configured to be selectively turned ON and OFF, to allow current to pass through the switch when turned ON, and to prevent current from passing through the switch when turned OFF. The controller selectively controls the switches in order to generate the treatment signal. The controller also selectively controls the switches in order to perform certain fault tests, which rely on voltages sensed by the voltage sense circuit and currents sensed by the current sense circuit.

Embodiments described herein relate to signal generators, systems including signal generators, and related methods. A signal generator includes capacitor(s) to store energy used to generate a treatment signal. The signal generator also includes a waveform shaping circuit, a controller, a voltage sense circuit, and a current sense circuit. The waveform shaping circuit is coupled to the capacitor(s) and includes first, second, third, and fourth switches, each of which is configured to be selectively turned ON and OFF, to allow current to pass through the switch when turned ON, and to prevent current from passing through the switch when turned OFF. The controller selectively controls the switches in order to generate the treatment signal. The controller also selectively controls the switches in order to perform certain fault tests, which rely on voltages sensed by the voltage sense circuit and currents sensed by the current sense circuit.

A method for a fault ride through testing of an electrical system including one or more power sources, one or more power consumers, and a first protective-isolation device and a second protective-isolation device both disposed between the one or more power sources and the one or more power consumers is disclosed. The method includes prior to the fault ride through testing, opening the second protective-isolation device, and closing the first protective-isolation device, and during the fault ride through testing, opening both the first and second protective-isolation devices to block current flow between the one or more power sources and the one or more power consumers. The method also includes during the fault ride through testing, decreasing a terminal voltage of the one or more power sources using a voltage regulator, and following the fault ride through testing, opening the first protective-isolation device, and closing the second protective-isolation device.