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ZXG-300N型直流氩弧焊机的控制箱中,有一块光电表,控制着焊机的引弧和正常工作。焊机在使用过程中,光电表出现故障将影响焊机的使用。现将光电表的工作原理和常见故障介绍如下。一、光电表的工作原理图1为光电表的工作原理图。焊机启动,接通电源。在未引弧以前、光敏三极管未被光照射,晶体管T_2饱和导通,晶体管T_3截止,继电器J不动作,电焊机产生高频,
In the control box of the ZXG-300N DC argon arc welding machine, there is a photoelectric meter that controls arc ignition and normal operation of the welding machine. During the use of the welding machine, failure of the photoelectric meter will affect the use of the welding machine. The working principle and common faults of the photoelectric meter are introduced as follows. First, the working principle of the photoelectric table Figure 1 is the working principle of the photoelectric table. The welder starts and the power is turned on. Before the arc is not induced, the phototransistor is not illuminated by the light, the transistor T2 is saturated and turned on, the transistor T_3 is cut off, the relay J does not operate, and the welding machine generates a high frequency.