FAQ: Does Yaskawa offer Sigma II power and encoder cables rated for continuous flex?
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Yes. Many applications require cables that are more flexible than a standard cable. As a result, Yaskawa has introduced continuous flex rated cables for Sigma II motors up to 11kW (see attached document for complete cable specification summary for Sigma II).
SGMAH and SGMPH motors feature continuous flex rated power and encoder cable assemblies as standard.
For the larger SGMGH, SGMSH, and SGMUH motors typically installed in a static environment where physical movement of the motor is less likely, the standard cable remains a non-flex rated cable. Continuous flex rated cables are available for both power and encoder simply by specifying the 'CE' version of the cable [e.g., B1CE-03(A) instead of B1E-03(A)].
Continuous flex rated cable is manufactured to meet varying needs and requires proper application and installation to achieve the desired results. Testing methods vary by manufacturer, however, two key parameters are routinely published by cable manufacturers which can be used to calculate cable life (# of cycles) based on a design target of 10,000,000 cycles. They are:
* Cable outside diameter (OD)
* Minimum bending radius as a function of cable outside diameter (e.g., 10 X OD)
If the minimum bend radius is too large, or a larger bend radius is acceptable, the effect on approximate cable life can be calculated as a function of the 10,000,000 cycle design target.
The relationship between cable longevity and bending radius is non-linear. When calculating life cycle, the term "approximate maximum" is best suited to describe the resulting calculation. Use the following as a guideline for such calculations.
1) (Cable radius / Radius of Bend) x 100 = xx%. If xx% is less than 2%, the 10,000,000 cycle mark is approached.
2) Take the calculated xx% and calculate this ratio relative to the 2% design target. (2%) / (xx%) = Ratio of chosen bend radius relative to design target.
3) Multiply this ratio by 10,000,000 to calculate the approximate maximum number of cycles.
Here is one example. Cable OD = 50mm. Minimum bending radius is 10 X OD. This means the minimum bend radius is
500 mm. This may be too large. Assume bend radius of only 400mm is possible. Thus, (25 mm / 400 mm) x 100% = 6.25%.
(2%) / (6.25%) = 0.32 x 10,000,000 = 3,200,000 approximate cycles.
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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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