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Frequently Asked Questions

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Question Posted Date  

Is there an alternative explanation of the term "User Units" pertaining to Yaskawa's electronic gearing built into the Servopacks and JUSP-NSxxx option board products?

Answer:
User units are a description of the resultant position units after electronic gearing parameters are adjusted. This is a feature used when a Yaskawa Servopack is in position mode. A Servopack may be in position mode under two circumstances: accepting pulses from a stepper motor indexer or when an application module such as an NS600, NS300 or NS500 is attached.

Electronic gearing is expressed as a ratio. The result is that the position can be pulsed or commanded in logical user units, not just motor-encoder counts. Positioning in user units allows the application programmer to set position targets in realistic units rather than encoder counts.

The Ratio is expressed as B/A, where B and A are integers. 'B' is the number of Quadrature [x4] encoder counts the motor will move for a given 'A' number of commanded user units.

If B=300 and A=20, then for every 20 user units sent to the Servopack via pulses or a position command issued from an option card, the servomotor will move 300 encoder counts. If only 10 user units are commanded, then the servomotor will move 150 encoder counts.

To see the equation and further information, please see the attached .PDF file.
Attachments:
31KB

Product Group/Line:
Controllers, Servo Products, NS100 Mechatrolink, NS300 DeviceNet, NS500 Profibus, NS600 Indexer, SGDA, SGDB, SGDH Sigma II
Topic/Sub Topic:
Ask a Technical Question, Start Up - Installation
Document Number:
MTN-5RJHGB
Published Date:
07/13/2004
07/13/2004

SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!

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.