A furniture factory reported that the KR200 series of an industrial robot library card they were using was not working properly. It was sometimes good or bad. They repaired it by themselves. They thought the main shaft was broken, but it was still the same after replacement. Our technicians immediately came to the door and checked that all the main shafts, motors and components were OK. Finally, they found that the power cord configured by the factory was cracked, which led to unstable working performance. After replacing the power cord, The fault is eliminated immediately, and the machine is running normally again, so here is a special reminder to match the appropriate power cord! Use qualified power cord!