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I design and test high power equipment that uses large SCRs (silicon controlled rectifiers). Sometimes one will go out. I use 6 in a three phase brid...
An SCR is a Silicon Controlled Rectifier. They are used in power supplies, welders, inverters and other equipment for controlling power. The one belo...
To test the SCR, you need to connect a power source to the device. The anode connects to positive and the Cathode connects to negative. The flashlight...
You will need to bring out three wires at the end of the flashlight. Start by drilling a hole just big enough for your wires. I used a Yellow, Red and...
Feed three wires about 18 to 24 inches long through the hole at the end of the flashlight. Make them different colors like I did and attach alligator...
Carefully adjust the lengths of the wires by pulling on the other ends. Trim the wires and attach alligator clips. Leave a little slack for screwing i...
Test the device by bringing together the red or white lead (positive) to the yellow lead (negative) together. The bulb should light. Now go find an S...
Clip the red positive lead to the SCR's Anode.
Now connect the yellow (negative) lead to the Cathode. The flashlight bulb should remain off. If it comes on, you have a shorted SCR.
Touch the white (positive) clip to the gate lead. The bulb should light up and remain lit even when you remove the connection to the gate. If it doe...
Remember to turn off all power to the equipment and lock out, tag out (LOTO) before testing.You can test SCRs in a 3 phase bridge without removing th...
Now test the other halve of the bridge. Connect the yellow negative clip to the positive bridge output bus bar at the left. Connect the red positive c...
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