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What is Safe Torque Off (STO)?

STO Function helps achieve safe operation of VFDs The functional description for Safe Torque Off (STO) is: “The safety-related disconnection according to STO is reached by a two-channel opto-coupler blockage. The supply of the opto-couplers, which are responsible for the commutation of the connected drive occurs via transformation coupling of the input voltage. This ensures at input voltage loss that no supply of the opto-couplers is possible. If the opto-couplers are no longer supplied, no insulated-gate bipolar transistor (IGBT) can be controlled and thus no energy can be supplied to the drive. The two channels are reached by way that...
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Show Preview: KEB America at Pack Expo

KEB has been supplying control and automation products for the packaging industry for nearly 50 years. This year we are pleased to once again be demonstrating our newest products and technologies at Pack Expo in Las Vegas. You can visit us in the Upper South Hall, booth US-7537. Here’s a preview of the technology you can expect to see from KEB America. EtherNet/IP solutions Get better performance for less. EtherNet/IP solutions from KEB America are available for every tier of the automation pyramid: Remote access, HMI, motion control, and drives. SCL positioning Encoderless positioning is possible. We make it happen...
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VFD Quick Stop Function Using an S6 Servo Drive

The VFD quick stop function is a method used to rapidly stop the motor from normal operation generally due to either an abnormal condition or system failure. This function is not to be confused with an emergency stop, or STO (Safe Torque Off). Rather, quick stop can be employed to bring the motor to a stopped position faster than normally expected with a nominal shutdown procedure. Is it Similar to DC Injection Braking? In a previous article, we’ve talked about a stopping method called DC Injection Braking, which is the process of injecting direct current into the stator windings of...
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Elevator Ride Quality Adjustment with a VFD

Many people take ride quality for granted when they ride in an elevator. A smooth and responsive ride requires precise adjustment from all system components such as the controller, variable frequency drive, and brakes. The variable frequency drive or VFD, can be a powerful adjustment tool for mechanics when properly applied. This article will specifically focus on software functions available in an elevator VFD for two main elevator adjustments; rollback and increased speed control response. Elevator Car Rollback Rollback can occur for a brief moment at the beginning of the ride when the brake lifts, a speed command has not...
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VFD Technology for Running High Speed Gearless Turbo Blowers

What are the most important factors when considering VFD Technology for Running High Speed Gearless Turbo Blowers? Here at KEB, we like difficult applications because this is where we excel and where our technology and application engineering differentiate us from our competitors.  These applications could require multiple axes of coordinated motion control or be located in challenging environmental conditions.  Operating a high speed motor/generator is one example of a difficult drive application. One high speed application that KEB has extensive experience in is running gearless turbo blowers.  This post gives an overview of KEB’s VFD offering and reasons why KEB...
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KEB F5 Startup in 10 Easy Steps

This is how to quickly and effectively start-up an asynchronous induction motor using our F5 drive. Utilizing KEB’s programming software COMBIVIS 6, we can break down the programming process into 10 simple steps. Specifically, we will be highlighting a KEB F5 startup in closed-loop control with encoder feedback.  The general process will be similar for other motors and control types. What do I need to Get Started? Closed-loop control with encoder feedback is a VFD control method that utilizes measured speed feedback through an encoder device. In general, there are five main components that will be required for a KEB F5...
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