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  1. PLCs, VFDs, Motors and Controls
    Hi everyone, Just stumbled upon this forum today and it looks amazing. I have a question for a project that I'm on. There's currently a system with a VFD and a Motor but the client wants to isolate the Motor from the VFD for when maintenance personnel want to work on the motor and safely lock...
  2. Commercial Electrical Forum
    What are the limitations for using a motor rated switch as a disconnect. For example: if I had a 20hp, 460v, 3 phase motor (which has a 27 amp FLC), and proper motor overloads. Could I use a 30A motor rated switch as long as it's rated for 20hp and I have the proper circuit breaker at the...
  3. PLCs, VFDs, Motors and Controls
    So I'm having a little disagreement with my supervisor at work and I'm hoping some of you can help me out. In a heat exchanger building, there are two exhaust fans being installed. They are both 3 phase 480 volt motors using 24 volt controls. The original blueprints had no disconnects...
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