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VAA-4A-G5-V2-ExAS-Interface actuator supplier module Notes Valve coupler: The block diagram at right illustrates the combined effect of the module and a valve switch.The module, with respect to the valve, provides a power source with internal resistance. The
input circuit of the valve corresponds to the load resistance R Masters and GatewaysPower Supplies, Extender, RepeatersSafety at workI/O ModulesControl cabinetI/O ModulesField applicationAnalogue modules A of this circuit. Minimum cur-rents and voltages must be available on the valve in order for the valve to switch correctly.The voltage U RL drops across the cable resistance R L due to the current I RA , which is thesame throughout.
The R i R L U RL AK I G
Output characteristicE: Curve angle point (U A/ U R A RA U I RA G: Professional generator R i : Internal resistorR L : Lead resistanceR A : Load resistorU A0 : Quiescent voltageU A : Output voltageU RL : Voltage drop on lead resistanceU RA :Voltage drop on loadU : max. voltageI : max. currentI AK : Short-circuit currentI RA : Load current output characteristic diagram at right shows the generator characteristic and the resist-ance line of the valve. The difference between the U RA and the actual output voltage U A meets the maximum voltage drop across the cable. From that, the maximum cable length and
resistance can be calculated. However, the calculation does not take into account the requirements per DINEN50020(Instrinsic Safety).Therefore, the user should test the system to ensure that maximum valuesfor external inductance and capacitance are not exceeded. Other modulesInductive sensorsPhotoelectric sensorsRotary encodersAccessories E /I E )
unpermissible area for cocks UU Output characteristic O U AO U A E U RL U RA I RA I AK I O I Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005 Subject to reasonable modifications due to technical advances.Copyright Pepperl+Fuchs, Printed in German y 214 Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.co m
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