It its hard lo imagine any transport system or production process today without hydrostatic drives as hydro-mechanical energy converters. The ease of control in open and closed loop circuits makes it possible to meet the increasing demands for flexibility and precision of drives brought about by tehnical rationalisation.
Secondary control has become increasingly important due lo the fact that Its characteristics are much more comparable to electrical drives with closed loop control than lo conventional hydraulic drives. It is therefore no wonder that secondary control and its associated dosed loop control technology has gained considerable impetus through the demands of electrical drives. This has led to the development of a new kind of closed loop control technology. Secondary control fitted the bill, with its already familiar structure and excellent dynamic response characteristics.

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