Control Valves : Type 6517
Design/Function
The system, consisting of pilot valve and position sensor with integral AS-Interface connection, reduces the effort for connection of a rotary actuator to a minimum.
The individual components are matched to each other so that the complete connection is installed and ready to use within a short time. Coding of the plug connections eliminates the possibility of incorrect wiring.
The AS-Interface offers the option of connecting up to 31 slaves per line to the controller or the higher level bus system with a minimum of wiring at low cost (in future 62 units will be able to be connected).
Current and data supply to the system is provided simultaneously via the yellow AS-Interface bus cable.
In this way, economy in cabling can be fully realized. Nevertheless, the energy that can be transmitted over the AS-Interface line is limited and the power consumption of the system must be considered.
Through the use of a low-power pilot valve (1 Watt), the current consumption of the overall connection from the AS-Interface was able to be limited to 75 mA. Thus, for example, it is possible to supply 31 connections with an AS-Interface power supply for 2.8 A, line losses included.
Integral pre-failure checking of the valve assures a high degree of reliability for the user. For example, the short circuiting of a first few windings by the penetration of moisture can be recognized prior to complete failure of the valve through the further effects of moisture.