FAQ: Does the torque limit (sLimit_Torque) need to be set on the MP940?
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Properly setting the torque limit is a very important step in commissioning an MP940 system. The MP940 requires this information to be set to match the data set in the servopack controller. If the torque limit is not properly set (ie - if the values in servopack and MP940 do not match), the MP940 will indicate an error displaying an A.9F alarm. This condition can be diagnosed by observing two error parameters from within MotionWorks+: "mError_Parameter_Settable" variable bit in the MP940 will be on, and "mError_Parameter_Number" will be 3, that indicates the torque limit is set out of range.
The proper torque limit can be calculated by using either "Sigma II Series Servo System User's Manual" or "Sigma II Servo System Product Catalog Supplement" to obtain the peak torque and rated torque values for the motor. Divide the peak torque value by the rated torque, and then multiply that quotient by -10000. This is the setting for "sLimit_Torque" (it must be entered as a negative number). (For MotionWorks users, sLimit_Torque is the same as OWC002 register.)
EXAMPLE: Motor SGMGH-20ACA61 motor has a peak torque of 254 in-lb and a rated torque of 102 in-lb. If you divide 254 by 102, the result is 2.49. Multiply this value by -10000 and the result is -24900. In MotionWorks+, enter a value of -24900 for the system variable "sTorque_Limit". When using the MP940 with a servopack, this value will always be a negative number.
The following table can be used for reference:
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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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