FAQ: Can a servomotor be energized while it is moving?
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The SGDH amplifier will not energize a servomotor that is moving. Because of this, it is important to have proper brake timing, especially on vertical applications. The SGDH has a built-in holding brake interlock (/BK output) that is the safest and most reliable way to make sure that the holding brake is applied correctly.
Example Situation: A customer wishes to use a simple digital output from a PLC to control his brake output (instead of the Yaskawa-recommended /BK output). The customer programs his PLC to remove the brake at the same time as he energizes his servo. If the brake releases before the motor is energized, gravity will cause the motor to coast downward. The SGDH will begin its attempt to energize the motor (digital display says "run"), but the amplifier will not allow the motor to be energized because it is moving. When the motor stops either by a hard stop or by external force, the SGDH will energize the motor. The motor will now be able to move as the controller commands. The solution to this situation is to hold the brake on longer to give the motor a chance to apply power. If the /BK output is used, the timing functions are all built-in to the SGDH.
For more information on using the Holding Brake Interlock with the SGDH amplifier, consult the SGDH User's Manual (YEA-SIA-S800-32.2) section 5.4.4.
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.
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2121 Norman Drive South
Waukegan, IL 60085