VEGA VEGAPULS series 60 Recurring function test - Manual (Page 7)

3 Sequence of the recurring function test
Carry out the recurring function test in the following sequence:
l
3.1 Restart the sensor
l
3.2 Verification of the current output
l
3.3 Verification of the instrument parameters (only with sensor
documentation)
l 3.4 Verification of the echo data (only with sensor documentation)
l
3.5 Sensor reaction to a level change
Information:
Document the recurring function test, for example, in the test protocol
in the supplement.
If one of the test points was not terminated successfully, there is
probably an undetected dangerous failure. The recurring function test
has failed.
In this case, proof of functional safety can only be provided by moving
the level to the switching point.
3 .1 Restart of the sensor
With this test point, it is possible to check of the sensor ouputs the
same value within the prescribed min. accuravy after a restart.
Warning:
The recurring function test influences connected devices. Take note
that downstream devices may be activated during the test.
Carry out a restart of the sensor. Proceed as follows:
1 Start PACTware and the corresponding sensor DTM.
Make sure that the conditions to the plant situation are maintained.
See "Required plant situation".
(range of the actual level or the reliability at least 20 dB)
2 Set the indication to "Current".
3 The level is subject to plant or process-relevant fluctuations.
Control the indicated current values over an adequate period.
Make sure that a damping is probably adjusted on the sensor.
4 Note the upper and lower limit values of the measured value.
5 Measure the output current of the sensor.
Preferrably use the indication of the input current value in the
processing system.
Function test not suc-
cessful
Before the restart
Recurring function test • for VEGAPULS series 60 7
3 Sequence of the recurring function test
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