Figure 3.15. Block of terminal contacts of the drive (Soyuz APDA). has good construction and technological properties: high durability, relatively low coefficient of friction, high dielectric properties, good processing qualities, etc. To improve the electrical characteristics, point contacts are formed between the metals. Some elevation of the contact on the metal is created, which increases the contact pressure. To reduce the wear of the plastic part of the disk a linear contact is used. Redundancy is done with partially slit contacts with the soldering of two wires or their complete separation for independent verification of the electrical circuits during testing and use. This type of sliding contact provides actuation (open and closed) during use with an accuracy of with initial tuning with a tolerance of . This terminal contact with the disk, which has a diameter of 26 mm, insures, for example, that the rod of the docking mechanism stops (it has a course of 0,5 m) in the initial portion of docking without using “accurate reading” contacts with a scatter of (not considering the overshoot of the drive).
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