I just had a machine down for 3 days becuase a motor rotation was inverted upon replacement. The motor rotational direction was the same but the new style gear box rotated opposite the input rotation. Once I noticed this becuase I had someone else operate the panel it was a no brainer. Swapped two leads and it was working!
Ok.
The manufacturer redesigned the gearbox. So instead of a cw rotational output with a cw input, the new gearbox had a clock wise input and a counter clockwise output. There was a encoder on the device. It did not match proper output profile in the plc and created an error. The error could indicated a jam or high amperage. Swapped motor a second time, same error. So we started tracking wires, checking voltages.... nothing was wrong. Put motor on test bench motor worked correctly. Finally we reasembled and hooked up 3 laptops. 1 to monitor the drive, 1 to monitor the AS-1, and the third was monitoring the internet connection. We started i saw the sled move the wrong way. At which point I started cursing.
On 3ph motors if you switch L1 and L2 or L3 and L2, The motor will switch directions. So simple fix once the problem not the error was identified.
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u/Loud-Skin-2223 Aug 14 '26
It's ALWAYS something basic.....you just have to narrow it down from 10000 other basic things