Siemens SIPART PS2 6DR50xx Instrukcje Operacyjne Pobierz pdf (Strona 158)

Parameterizing/addressing

10.4 Description of parameters

SIPART PS2 with and without HART communications

158 Operating Instructions, 09/2007, A5E00074631-07

10.4.3.3 Description of parameter C

LEAK - pneumatic leakages

Use this parameter to activate the pneumatic leakage test. This test can be used to

determine possible pneumatic leakages. Depending on the direction, changes in the position

and the internal manipulated variable used for it are continuously recorded and filtered for

this purpose. The filter result is used to form an indicator, which allows drawing a conclusion

about a possible leakage.

NOTICE

Accuracy of results

Note that this test delivers unambiguous results only in the case of single-acting, spring-

loaded actuators.

Set the "On" parameter value to activate the test. Sub-parameters are displayed. Sub-

parameters are described below.

The current value is displayed in the "15 ONLK" diagnostics parameter. The positioner

triggers a fault message if the current value exceeds one of the three configurable limit

thresholds.

The factory setting is "OFF".

C1.LIMIT - limit of the leakage indicator

Use this sub-parameter to set the limit of the leakage indicator in percent. Set the limit in a

range from "0.1" to "100.0". There is no leakage if the limit is less than "30.0".

Utilize the complete sensitivity of the leakage detection as follows:

1. After initializing the positioner automatically, use a calibration device to initiate a ramp

movement.

2. Conditions for the ramp movement:

– The ramp must cover the normal operating range of the valve.

– The steepness of the ramp must match the dynamic requirements of the

corresponding application.

3. During the ramp movement, the "15 ONLK" diagnostics parameter provides information

about the actual values. Define the limit of the leakage indicator accordingly.

The positioner triggers a fault message if the current value exceeds one of the three

configurable limit thresholds. How to set the three limit thresholds is described below.

The factory setting is "30.0".

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 241 242

Brak uwag

Siemens SIPART PS2 6DR50xx Instrukcje Operacyjne Strona 158