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  1. PLCs, VFDs, Motors and Controls
    I took a test for a plant electrician at an automated fruit packing plant. For the practical section I was supposed to connect a VFD to a motor. I can't recall if it was single or 3-phase. There were about 6 wires between the VFD and the motor where I was expecting 3 at most. I think the VFD was...
  2. PLCs, VFDs, Motors and Controls
    As for speed of the motor i want to control with a simple 10k pot. At laboratory, there are controllogix l63, powerflex that i need... And, there is stratix 8000, it communicates plc with powerflex 70 drive. So, i want to vary +- 10 V with pot: when i looked to powerflex sheet...
  3. General Electrical Discussion
    Hi, I am missing something. I have a powerflex 70 with remote HIM which is currently being used to start and stop a pump. I want to control the drive using 2-wire control with a jog reverse. The wiring has been completed as in the manual with the necessary parameters being changed. But here's...
  4. PLCs, VFDs, Motors and Controls
    We have 4- 50hp drive controlled winch motors. The drive cabinets are in an exhaust drift in an underground mine, and are not in a controlled environment. Since install we have lost 6 drives- 2 because of the MOV jumpers, 1 because of contamination (those three were at commissioning), and the...
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