High-flex rag chain dcable plays an important role in signal, control and power transmission of the equipment. High-flex drag chain cable must be synchronized with other components in carrier. Furthermore, it must take care of installation and protection of high-flex drag chain cable in carrier particularly. Stable and effective use with a long service life depends on accurate installation.
1. Ensure that cable is completely free to move within the bending radius, i.e., the cable can move relative to each other and to guide device without any forced movement. When high-flex cable is routed in carrier, it can neither be too loose, nor too tight: the former might cause cable to bend and twist in carrier so as to affect its service life; The latter might lead in greater friction between the cable and inner wall of carrier so as to cause cable sheath wear and tear, and increase radial force of cable, as well as cable distortion that affects the service life.
Cable fixture must be mounted at both ends of cable carrier, and the fixing point can't be moved; The distance from the end of bending curve to the fixture shall be as large as possible, in general, greater than 20 to 30 times cable diameter.
It's forbidden to fix the high-flex drag chain cable in any moving part of cable carrier, or bundle the cables in cable carrier together, that would hinder the absorption and dispersion capability of cable for bending stress, and would affect the service life.
2. As for wiring of the high-flex cable in carrier, the cable should be laid side by side in the support of carrier as far as possible. There must be a certain gap between two adjacent cables; The gap betwee cables in carrier shall be at least 10% of cable diameter.
Avoid multi-layer routing of cable(i.e., avoid arranging one cable on another without using a spacer). If the space is limited and it need place one cable on another, it must utilize a spacer or shelves!
If there is a large difference in diameter of cables, and the diameter difference of cables is greater than 20% wiring size, it is necessary to utilize a partition between two cables to avoid the play of cables or winding each other.
The filling coefficient of cables in carrier should be controlled below 60% (less than 30% is more ideal).
In order to ensure the balance of cable carrier in motion, the weight of the cable distributed on carrier should be as balanced as possible; It's recommended that the heavier cable be located on both sides and the lighter one be located in the middle.
Note:
- A: After a period of operation, periodically check the position of cable; The check must be performed after any push/pull movement; If there is any displacement, it shall be improved and adjusted in time.
- B: For vertically suspended cable carrier, there must be more free space inside the bracket, because the cable will be stretched during operation due to gravity. After a period of operation and use, regularly check the length and position of cable; The check must be performed after any push/pull movement; If there is any displacement, it shall be improved and adjusted in time.
3. If cable carrier is damaged or broken, the cable also needs to be replaced, because damages from excessive stretching can't be prevented or repaired.
4. Bending radius of the flexible cable used in cable carrier should conform to technical parameters in the product specification.
5. After a period of operation, regularly check the position of cable, and often confirm that the cable can follow the carrier movement without any force; The inspection must be performed after push-pull movement; If any displacement or force exists, it shall be improved and adjusted in time.
6. To lay multi-core high-flexible cables with a diameter less than 10mm, it's recommended to use a guide duct.
7. For freely moving pipes, guide duct or partition should be mounted.
8. Adjacent cables can't cross over each other, so the gap over cable should not be greater than 50% of the diameter of adjacent cables.
The rules below must be followed:
- Rule 1: If D1+D2>1.2 times the inner height of cable carrier, it's unnecessary to separate the two cables. The cables can't cross over or wrap each other (shown as below).
- Rule 2: If D1+D2<1.2 times the inner height of cable carrier, separator must be used to reduce the gap (shown as below).