• ETT Level 4.15: Controls

    Learn how to analyze and understand complex and overlapping sequential operation of protective device control schemes, metering schemes, and PLCs.

    1. Complex control systems - Understand application and programming of programmable logic controllers (PLCs). Analyze and understand complex and overlapping sequential operation of protective device control schemes, metering schemes, and PLCs.
    2. Complex motor control - Be knowledgeable of variable speed drives.
      • AC Drives and Soft Starter Application Guide [PDF] This paper examines the differences between ac variable frequency drives (VFD's) and soft starters, and when and where to properly apply each of them.
      • Eddy-Current Drives [PDF] Most electrical adjustable-speed drives fall into five general categories: adjustable voltage dc, adjustable frequency ac, adjustable voltage ac, wound-rotor motor, and eddy-current coupling drives. This article describes the basic eddy-current drive.
      • Starting Methods for Large Medium-Voltage Motors [PDF] When motors are large with respect to the capacity of the power system it is often necessary to use a starting method that reduces the impact on the power system caused by starting the large motor.

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