CONTROLLER FOR RESISTANCE WELDER

摘要

PURPOSE:To transmit input signals surely from remote places without attenuating the signals by inputting the signal for firing a main thyristor to an amplifier circuit for firing signal by means of an optical communication unit using an optical fiber cable. CONSTITUTION:A pulse oscillating circuit 31 and an amplifier circuit 8 for firing signal are connected by means of an optical communication unit consisting of a signal transmission unit 39 and a signal reception unit 40. The oscillated output from the circuit 31 is converted to a light signal by the unit 39, and the light signal is fed to the unit 40 through an optical fiber cable 41. The light signal is converted to an electric signal by the unit 40 and the electric signal is fed to the circuit 38.