Controls
Once power supply has been established, actuators equipped with integral controls can be operated via the operation elements on the local controls. The controls are perfectly adapted to the actuator. The actuator can be completely set locally, without requiring direct connection to the DCS. Only operation commands and feedback signals are exchanged between the control system and the actuator. Motor switching is performed within the device and virtually without delay.
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AC controls are your perfect solution if the application requires self-adapting control functions, data logging, configurable interface or if valve and actuator are to be integrated into a Plant Asset Management System due to advanced diagnostic functions.
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AC controls are equipped with a parallel interface for free configuration and/or interfaces to fi eldbus systems as used within process automation.
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The diagnostic functions comprise a time-stamped event report, torque characteristics logging, continuous recording of temperatures and vibration within the actuator and, furthermore, counting the number of starts and motor running times.
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Further to the basic functions, AC controls offer a number of options to meet special demands. These include torque by-pass to unseat valves if tightly seated or functions for extending operating times to avoid water hammer within pipelines.
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With the development of the AC 01.2, particular emphasis was laid on user-friendliness and the ease of integration of actuators into the DCS.
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The large graphic display is used to perform menu-controlled programming of the controls, optionally using AUMA CDT via wireless Bluetooth connection. For fieldbus connections, AC programming can be performed from the control room.
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Can be explosion proof if required.
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Options can be used up to SIL 2 and 3
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AM controls with simple design and defined features is the perfect choice when using parallel signal transmission and if a relatively low number of feedback signals is required.
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Few parameters need to be defined via sliding switches during commissioning, e.g. type of seating in end positions.
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Actuator control is made via operation commands OPEN, STOP, CLOSE.
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Reaching an end position and collective fault signals are reported back to the DCS as feedback signals. These signals are visually displayed at the local controls via the indication lights. As an option, the valve position can be transmitted as 0/4 - 20 mA signal to the DCS.
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AUMA offers sophisticated control for premium safety requirements with AC 01.2-SIL or ACExC 01.2-SIL actuators controls. SA .2 and SQ .2 actuators combined with these actuator controls can be deployed in safety-related system systems up to SIL 3.
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AC 01.2 actuator controls in SIL version are equipped with an additional SIL module designed for the execution of safety functions. In case of an emergency at the plant and when requesting a safety function, the standard logic of AC .2 is by-passed and the safety function is performed via the SIL module. Consequently, the safety function always overrules standard operation.
