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  Calculation of the Maximum Cable Length

Use

This function calculates the maximum cable length for a reel type by applying the following mathematical formulas to the reel data and the specified cable data. It then checks the relevant cable length against this maximum cable length to determine whether the reel type is suitable.

Features

  1. Before performing the reel calculation, the system converts the reel material master data, the cable material master data, and the cable length data into the relevant calculation unit (see Different Units of Measure for Cable and Reel Data ).

  2. The system calculates the number of vertical layers (VL):

    The cable diameter with allowance (CDwA) is calculated using the following formula:

  3. The result for the number of vertical layers (VL) is rounded down to a whole number.

  4. The system then calculates the reel clearance (CL):

  5. If a clearance is specified in the cable master data, the system checks whether the calculated clearance is less than the clearance in the cable master data. If this is the case, the number of vertical layers used in the formula is repeatedly subtracted by one and the actual clearance is calculated until it equals the clearance specified in the material master.

  6. If the number of vertical layers is specified in the cable master data, the system checks whether the number of vertical layers calculated (possibly reduced because of the clearance) exceeds the number of vertical layers in the cable master data. If this is the case, the number of vertical layers specified in the cable master applies.

  7. The system repeatedly reduces the number of vertical layers by one until the following equation is met.

    Note Note

    The factor 0.93 is a default value that takes account of the fact that cable layers do not fit precisely on top of each other. You can set this factor in Customizing for the Reel Calculation .

    End of the note.

    Note Note

    In this equation, the system assumes that a maximum of two extra vertical layers may be wound on top of the run-out flange of a reel (if provided). In Customizing for the Reel Calculation , you can define the number of extra vertical layers that can be wound on top of the run-out flange.

    End of the note.

  8. The system calculates the number of horizontal cable layers (HL):

  9. The number of horizontal layers is rounded down to a whole number.

  10. The system calculates the mean reel circumference (MC):

    Note Note

    The factor 3.05 (= non-aligned winding factor) is a default value. It is calculated as 0.97 x π and is based on a recommendation by a research institute. In Customizing for the Reel Calculation , you can set the non-aligned winding factor.

    End of the note.

  11. The system rounds the mean reel circumference (MC) to a whole number.

  12. The system applies the following formula to the data calculated in the preceding steps to determine the maximum possible cable length (CBL) for the reel: