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How a PI Controller in a VFD Speed Control works

Across KEB’s line of inverters, a PI controller is used whenever closed loop control is utilized.  This blog post and the accompanying YouTube video describe how this PI controller is used in a VFD to provide precise speed and torque control of the motor. What is the PI Algorithm? The PI, or Proportional and Integral, controller is a commonly used method in control systems to correct for error between the commanded set point and the actual value based on some type of feedback. In the case of KEB drives, the PI controller is implemented in the speed control portion of...
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Surge Protection for DC Switching with an MOV (Metal Oxide Varistor)

Adding surge protection for DC switching into your application will safeguard vulnerable circuit components like an electromagnetic brake and clutch rectifiers from transient voltage. Without this protection you run the risk of wearing out the contacts of your rectifier prematurely. One method to protect from these surges is to install an MOV. What is an MOV? A Metal Oxide Varistor (MOV) is a voltage dependent resistor. In other words, it’s an electrical component whose resistance varies with voltage. They are used to protect vulnerable circuit components from short surges of electrical energy What happens when power is turned off to...
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AGRITECHNICA Show | Electrified Farming Equipment Solutions

The KEB T6 All-in-One Auxiliary Inverter Optimizes Reliability and Performance KEB will showcase its T6 auxiliary inverter at the AGRITECHNICA Show in Hannover, Germany, November 10-16 2019. The T6 is a flexible all-in-one AC motor controller system designed for compressors, pumps, fans and other electrified components in commercial electric and hybrid vehicle applications. The T6 system is positioned to be a breakthrough piece of technology vital to the future of electrified farming vehicles and implements. T6 Capabilities and Features: Multi-axis inverter for auxiliary motors Scalable: 1-6 Motor outputs Modular: 7.5, 15, 30 KW Single IP67 / IP6K9K housing Applications include...
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3 Ways to Protect a VFD Braking Resistor from Short-Circuit Failure

Energy overload situations can cause braking resistor failure, but is easily prevented with the right equipment and system design. In this article we’ll explain the cause of overload conditions and present three methods that will help you address this common problem. After all, you want to protect your VFD and related equipment in order to prevent unhappy customers and co-workers that experience a system failure. Brake Resistor – Normal Operation Under normal operation, the brake resistor is driven by a brake chopper transistor when excess energy is returned to the VFD. The brake chopper continuously turns the brake resistor on...
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The Electrification of Agricultural Equipment – Tractor and Implements

This is Part II of a two-part series exploring the electrification of agricultural equipment.  Part I focuses on the electrification of auxiliaries. The Benefits of Electrifying Implements In Part I, we focused on the opportunities and benefits of electrifying the propulsion and auxiliaries in tractors or other agricultural equipment. In this article, we will focus on the benefits and the opportunities of electrified farming implements and attachments.  Traditionally, implements have either been power take-off (PTO) implements that are mechanically coupled and powered by the engine transmission or otherwise hydraulically powered.  As with electrifying the auxiliaries, electrified farming implements reduce the...
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The Electrification of Agricultural Equipment – Tractor Auxiliaries

This is Part I of a two-part series exploring the electrification of agricultural equipment.  Part II will focus on the electrification of implements. Vehicle electrification has begun migrating from urban streets and highways to off-highway construction and underground mining equipment but has only seen a handful of prototypes for agricultural applications.  Many of the primary pain points of combustion-driven vehicles are the same, whether on the road or in the field – emissions and noise are the usual suspects as well as the desire for a path towards sustainability.  While cost and capability limitations may yet be barriers to entry...
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