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  • Application Note: EMX3 Motor Overload Protection (.pdf)
    EMX3 motor overload protection is provided by a second order thermal model. This highly advanced protection method combines co-dependent thermal modeling of the motor windings and the motor body (the iron case), with allowance for different cooling rates when the motor is running and when it is off
  • Protecting Motors Against Overload Conditions Using “I-squared-T” Methods (.pdf)
    The goal of an effective motor overload protection scheme is to protect the motor from damage while allowing it to operate normally up to its thermal limit. Ideally such a scheme would be based on a direct measurement of internal motor temperatures. Unfortunately the temperature at different points
  • What Is Your Ideal Overload Relay?
    Choosing which relay to use for overload protection depends on the specific electric motor starter application.
  • A crystal ball for motor controls
    Advances in device-level communications along with dedicated software let intelligent motor-control architectures provide useful information to maximize machine uptime. The E3 and E3 Plus motor-protection relays from Rockwell Automation protect single or three-phase squirrel-cage induction motors
  • Mechanical torque limiters still make sense
    overload protection. Electrical overload protection has been used since the days of the first industrial electric motors. Back then it simply protected motors against thermal overloads. Today, however, protection devices monitor many parameters - such as current, voltage, force, torque, rotation
  • Self-Protecting Starters
    the next two years. Several features make the SPS preferred over traditional motor controls. A self-protected starter combines contactor, overload, and short-circuit protection in one package. It is sized according to motor load current and horsepower. Generally, a small interchangeable module
  • Torque limiters get fillers out of a jam
    disengaging the motor drive. Zero-Max Torq Tenders use an adjustable, springloaded convexshaped pin and detent overload mechanism. An overload condition disengages the pin from the detent and stops power transfer. Once the fault clears, the device can be manually reset (without tools) to its prefault angular
  • The "no blip " power supply
    New industrial power sources handle current surges without tripping off. The result: No need to overspecify capacity. Here's what can happen when an ordinary power supply sees an inrush current as from a motor turning on: Temporary overloads can trigger the electronic protection circuits and trip

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