A food equipment device, such as a warewasher, includes a powered component, the powered component being one of a heating element or a pump or a fan, and a power line path for delivering power to the powered component. A contactor is provided for controlling power delivery to the powered component, the contactor including main power contacts connected in the power line path and auxiliary contacts that operate the same as, or opposite to, the main power contacts. A monitoring system is operatively connected to the auxiliary contacts to monitor an open or closed state of the auxiliary contacts and includes a voltage source operatively connected to one of the auxiliary contacts and an electrical sensor for detecting one of (i) a voltage condition of the other auxiliary contact or (ii) a current flow condition between the auxiliary contacts.

A short circuit test device includes: a first line test conductor couplable to a first load line conductor of an electric load network and a neutral test conductor couplable to a neutral conductor of the electric load network; a voltage source switchable to the first line test conductor and the neutral test conductor to output a predefinable test signal; a measurement unit for measuring an electric voltage and/or current, the measurement unit including measurement inputs which are connectable to the first line test conductor and the neutral test conductor, the measurement unit including an output for providing a measurement signal; and a control unit connected to the voltage source and the measurement unit, the control unit: causing the voltage source to apply a test voltage to the first line test conductor and the neutral test conductor and comparing the measurement signal provided by the measurement unit.

The present invention relates to a swinging door test system that can test the accuracy of a balanced magnetic switch installed on a mock door. An actuator opens and closes a door to change the magnetic switch state. Software implementation allows the actuator to be precisely controlled over many cycles to save time and effort.

The present invention addresses the problem of diagnosing a failure of a discharge resistor, while suppressing deterioration of discharge capacity. Disclosed is a failure diagnostic device for a discharge circuit 60 for discharging electricity from an electricity storage element 31. The discharge circuit 60 includes a resistance circuit 61 comprising a plurality of resistor blocks B connected in parallel, and each of the resistor blocks B comprises a plurality of discharge resistors Ra, Rb connected in series. During the time when electricity is being discharged from the electricity storage element 31, the failure diagnostic device diagnosis a failure of the resistance circuit 61 on the basis of a voltage or a current at a connection point P between the discharge resistors Ra, Rb.

A power contact fault clearing device includes a first pair of terminals adapted to be connected across a first set of switchable contacts, and a second pair of terminals adapted to be connected across a second set of switchable contacts. The second set of switchable contacts coupled to an arc suppressor. A current sensor is adapted to be connected between a power load and the second set of switchable contacts. The current sensor is configured to measure a power load current associated with the power load. A controller circuit is operatively coupled to the current sensor and the first and second pairs of terminals. The controller circuit is configured to detect a fault condition based at least on the power load current, and sequence deactivation of the first set of switchable contacts and the second set of switchable contacts based on the detected fault condition.

A collecting and measuring method has corresponding a contacts group to a key of a computer keyboard; corresponding a contacts group state to a key state; corresponding a first keys group and a second keys group to a first power contacts group and a second power contacts group respectively; obtaining and storing a first values group and a second values group when the first keys group and the second keys group are closed respectively; calculating a difference value between the second and first values groups; dividing the difference value by the device frequency value to get a time value; and storing the time value. The time value is a conduct transition time value of a corresponding pole.

A test unit for an actuation device of an electrical apparatus is configured as an ASIC and includes a test circuit configured to generate a voltage test sequence, a memory configured to store a response pattern, and an analysis unit configured to compare the response pattern with a reference pattern.

A switch circuit includes a first circuit including a first switch and first output terminals, and a second circuit including a second switch and second output terminals. The first circuit and the second circuit are connected in series. The first circuit has a circuit configuration in which a combination of resistors in a signal path between the first output terminals of the first circuit differs depending on the electrical conduction state of the first switch. The second circuit has a circuit configuration in which a combination of resistors in a signal path between the second output terminals of the second circuit differs depending on the electrical conduction state of the second switch.

The present invention relates to a solid testing platform and method for function testing of an intelligent phase-change switch. The testing platform includes a primary controller, a first module, a second module, a capacitor C, an intelligent phase-change switch, and a transformer. The primary controller is respectively connected to the first module and the second module, and is configured to control the operation of the first module and the second module. The first module and the second module are connected in parallel to the capacitor C. the first module is configured to feed back excess energy of the capacitor C to a distribution network. The second module is configured to control magnitude and direction of a current that flows through the intelligent phase-change switch. The capacitor C is configured to perform energy support, filtering, and smoothing. According to the present invention, not only all unbalanced operation conditions can be simulated, but also simulated power is equitably fed back to a power grid by using the testing platform, to achieve a test in a state of no power loss, without affecting a main power grid.

A process tests an operability of a circuit breaker device (18, 20, 34) to establish/sever a connection of two circuit areas (36, 38, 40, 42). The circuit breaker device includes a MOSFET (44) with a source terminal (46) connected with a circuit area, a drain terminal (48) connected with a circuit area, and a gate terminal (50) with a gate voltage applied by an associated gate driver device (52) to switch into a connection switching state connecting the two circuit areas during a connection phase. The gate voltage is monitored during the connection phase, a base voltage being applied to the source terminal or/and to the drain terminal during the connection phase is monitored. If a difference between the gate voltage and the base voltage falls below a predefined reference difference during the connection phase, it is determined that a circuit defect is present in the MOSFET.