FAQ: What are some tips for operating a single load with multiple servo motors?
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1. Configuration
To lessen torque discrepancy (fighting) among the axes, it is often useful to set PN10C = 0 in the slave(s). This sets the ServoPack to operate the velocity loop in proportional (P) only mode. It will keep the speed loop integrator in the ServoPack from building up and adding torque disturbance.
2. Alignment
Hold the master axis stationary. Limit the torque in the slave axis to something reasonable (that will not damage the mechanism). Slowly (referencing or homing speed) move the slave axis reverse, when torque limit is reached, record the slaves actual position. Move the slave axis forward, when torque limit is reached, record slaves actual position. Move the slave to the mid-point of those two positions, and then enable 1:1 gearing to the master. Typically this is completed as a referencing routine in the motion/machine controller, such as Yaskawa MP controller.
3. Gains
When tuning it is important to change the gains on all shared axes at the same time. If using Model Following Control (MFC) tuning methodology, it is important that these ServoPack parameters are the same for all axes. Theses include PN140 - PN14F.
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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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