光电开关工作原理和故障排除（国外英文资料）.docVIP

光电开关工作原理和故障排除（国外英文资料） Shijiazhuang huayan transportation technology co., LTD 2007-4-3 Working principle and troubleshooting of photoelectric switch Category: [device maintenance] source: hua yan traffic technology time: 2005-8-20 9:20:51 click: 1271 text size 12px 13px 1, 14px, 15px, 120%, 140%, 160% 180% Working principle and troubleshooting of photoelectric switch How it works: Test line in photoelectric switch is mainly in order to determine whether the car in place (i.e., on the test bench), photoelectric switch for use in pairs, one side for launch, one for the receiver. The photoelectric switch has two wires at the launch, as long as to the dc 12 v ~ 240 v or 24 v ~ 240 v alternating current (ac) can work normally, the performance of the work for the red indicator light on photoelectric switch; There are five lines on the receiving end; Two of the two lines are powered by the same color as the two lines on the launch side; One of three other thread root for public end connected to + 5 v power supply (line), a root is often start, a normally closed end, depending on the model of photoelectric switch with normally open or normally closed provide the 5 v power supply to the computer. When the power supply work under normal operation of the transmitter and the receiver in a line, at the ends of the photoelectric switch indicator light bright, otherwise may light is not bright at the receiving end, the indicator lights on the normal testing two photoelectric switch should be fully bright, when on test bench or into the specified position, photoelectric switch indicator at the receiving end, the common and often start conduction, the 5 v power supply to the computer on the I/O conversion board, thereby stopping car in place. Failure mode: 1) the car has not been on the detection desk, the detection software has begun to detect; 2) there is no indication that the rear light screen is in place after the inspection stage or after the inspection Failure analysis: The f