Abstract: A motor driving apparatus includes: a threshold providing circuit that provides a plurality of power failure detection thresholds determined according to an installation environment of the motor driving apparatus, a selection circuit that selects a specified power failure detection threshold from the power failure detection thresholds, and a comparison and determination circuit that determines presence or absence of an occurrence of power failure by comparing a detected voltage of an alternating-current power input to a motor driving circuit and the selected power failure detection threshold. Consequently, it is possible to select the power failure detection threshold, which determines a detection reference of power failure in which alternating-current power input is interrupted, according to an installation environment, so that the abnormal end process in the case of an occurrence of power failure in which alternating-current power input is interrupted can be surely performed in any installation environment.

Abstract: A motor driving apparatus includes: a threshold providing circuit that provides a plurality of power failure detection thresholds determined according to an installation environment of the motor driving apparatus, a selection circuit that selects a specified power failure detection threshold from the power failure detection thresholds, and a comparison and determination circuit that determines presence or absence of an occurrence of power failure by comparing a detected voltage of an alternating-current power input to a motor driving circuit and the selected power failure detection threshold. Consequently, it is possible to select the power failure detection threshold, which determines a detection reference of power failure in which alternating-current power input is interrupted, according to an installation environment, so that the abnormal end process in the case of an occurrence of power failure in which alternating-current power input is interrupted can be surely performed in any installation environment.

Abstract: The printed circuit board for mounting electronic parts thereon is obtained by transferring flux from a supporting film to the surface of a printed circuit board, and soldering the electronic parts thereto after the supporting film is removed. The supporting film is first coated with the flux, and the flux is transferred to the printed circuit board through the application of heat and pressure. Hot air can be blown from an oblique direction on the flux-coated surface of the printed circuit board after the flux is transferred thereto and before the electronic parts are soldered thereto.This method can provide a uniform flux coat on the printed circuit board and can eliminate various drawbacks which are encountered in conventional approaches in which the surface of the printed circuit board is coated directly with flux in liquid form.