IEC 61514:2000 pdf free download – Industrial-process control systems
1 Scope and object
This International Standard specifies tests designed to determine the static and dynamicperformance of single-acting or double-acting positioners. The tests may be applied topositioners which receive standard analogue input signals (as specified in’ IEC 60381 andiEC 60382) and have a pneumatic output.
NOTE For positioners with pulsed or digital input signals，equivalent criteria may be applied. The methodsdescribed may not fully apply to positioners with digital controllers or positioners with pulsed outputs.
Testing may be conducted either on a positioner alone, independently of an actuator, or on apositioner mounted and connected to a specific actuator, as a combined unit. The text makesclear where different approaches are required.
The methods of evaluation given in this standard are intended for use by manufacturers todetermine the performance of their products,and by users, or independent testing establish-ments, to verify manufacturers” performance specifications.
The closest liaison should be maintained between the evaluating body and the manufacturer.Note should be taken of the manufacturer’s specifications for the instrument when the testprogramme is being decided,and the manufacturer should be invited to comment on both thetest programme and the results.His comments on the results should be included in any reportproduced by the testing organization.
This standard is intended to provide definitions of positioner elements，actions，andcharacteristics, to specify uniform methods of measuring performance errors and effects ofinfluence quantities’ on those characteristics，and to describe methods of reporting andevaluating the results of the measurement data obtained.
The test conditions described in this publication (for example range of ambient temperaturesand power supply) relate to conditions which commonly arise in use. Consequently,thevalues specified shall be used where no other values are specified by the manufacturer oruser. lf other values are used, they should be stated. lt is recognized that the manufacturer’sspecifications and instructions for installation and operation should apply during all steps.
The tests specified in this standard are not necessarily sufficient for instruments specificallydesigned for unusually arduous conditions.Conversely,a reduced series of tests may serveadequately for instruments designed to perform within a more limited range of conditions.
When a full evaluation，in accordance with this standard，is not required or possible，thosetests which are required should be performed and the results reported in accordance with therelevant parts of this standard. In such cases, the test report should state that it does notcover the full number of tests specified herein.
The measurement points used to determine the relevant performance characteristic should bedistributed over the range.They should include points at or near (within 10 %) the lower- andupper-range values.There should be at least six measurement points, and preferably more.The number and location of these measurement points should be consistent with the degreeof precision required and the characteristic being evaluated.Each measurement point shouldbe reached avoiding any overshoot of the input signal.
5.4.1 Positioner tested independently of an actuator
Tests carried out on a positioner, tested independently of an actuator, are conducted with theoutput Y of the positioner connected only to a dummy load (sometimes referred to as “open-loop” operation).
Unless otherwise agreed,a 1 000 cm3volume shall be connected to the output. In this way,the performance of the positioner is not affected by the performance of the actuator.
This is the only test method which provides positioner data independent of an actuator, andmay be useful in comparing the performance of one positioner with another, or in checking amanufacturer’s specification for a positioner.
The travel adjustment can be made manually or by using an actuator (manually controlled).
The input signal W can be manually adjusted to obtain the required re-balance of outputsignal Y, or a loop between output signal Y and input signal W can be arranged if desired, i.e.automatic re-balance.