FAQ: Sometimes my machine power-up position is incorrect even though I have an absolute encoder on the motor. What is causing this issue?
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Pn205 allows the absolute encoder to synchronize itself with the mechanical load's position. The value must be chosen so that the number of turns tracked by the absolute encoder of the motor is an integer multiple of the desired mechanical cycle of the mechanism. When Pn205 is set incorrectly, the mechanism's home position may not be correct after a power cycle.
Please see the attached documents that illustrate how to calculate Pn205 with three example applications.
IMPORTANT NOTE: After making a change to Pn205 and cycling the power, the drive will display alarm A.CC0 (Multi-turn Limit Disagreement Error). This alarm is fixed by executing the "Multiturn Reset" function found in the web server (section "Machine Operations", tab "Drive Pn"). After executing this function, cycle power again to clear the alarm.
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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If you have an urgent request, please call: 1-800-YASKAWA (927-5292) or 1-847-887-7000.Electronically
To contact us electronically, please select your type of request and complete the form.Yaskawa America, Inc. - Drives & Motion Division
2121 Norman Drive South
Waukegan, IL 60085