FAQ: Can the linear encoder be mounted "backwards" (positive direction of linear encoder opposite to positive direction of linear motor)?
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Yes, the linear encoder can be mounted "backwards" relative to the linear motor, it is good design practice to insure that the motor and encoder have the same positive direction reference. Normally, the linear motor and encoder would be oriented such that the positive direction of each is in the same direction. The positive direction of the linear motor is in the direction in which the motor cables/connectors protrude. Generally, this holds true for the linear encoder as well (as it does for Renishaw and Heidenhain). Please consult the linear encoder manufacturer in regards to positive orientation.
If the linear encoder is mounted "backwards" relative to the linear motor, one of the following MUST be done in order for the linear motor system to function properly.
1. Rewire the linear encoder cable. Swap the "A" signal wires with the corresponding "B" signal wires.
2. The following is only applicable for Sigma II SGDH type servo amplifiers with the Y213 modification (Y213 modification is for use with linear motors only). Set user parameter Pn080.1=1 (B-phase progression). This will allow for proper commutation of the linear motor. However, the positive direction of the motor will now be in the direction opposite in which the motor cables/connectors protrude. To change the motor direction, set Pn000.0=1.
3. The following is only applicable for Legend SGDG type servo amplifiers. Set SW1 function selection switch no.4 (Linear Scale Polarity Reversal) to OFF (B-phase progression). This will allow for proper commutation of the linear motor. However, the positive direction of the motor will now be in the direction opposite in which the motor cables/connectors protrude. To change the motor direction, set SW1 function selection switch no.6 (Feedback Pulse B-phase Reversal) to OFF.
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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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