Samson TROVIS SAFE 3731 Series, Operating Instructions Manual, Page: 99 / 104

EB 8389S EN 99
Appendix
7.4 Determining the ramp times of the partial stroke test
Suitable ramp times for the partial stroke test can be determined by performing a full stroke
test.
NOTICE
See section 4.5 on how to perform a full stroke test.
1. Adjust the FST diagnostic parameters as follows:
'Tolerance limit of step response' = 2.0 % (WE)
'Activation of the ramp function' = Yes (WE)
'Ramp time (rising)' = 900 s
'Ramp time (falling)' = 900 s
'Settling time before test start' = 10 s
'Delay time after step' = 4.0 s
'Scan rate' = 'Min. recommended scan rate'
2. Adjust 'Scan time' of the data logger to 0.2 s and start the data logger ('Selection' = Per -
manent). See section 3.2.
3. Start full stroke test and change directly to the data logger graph.
4.
After the full stroke test is finished, stop the data logger and save the data.
5. Analyze the logged data: If the valve position follows the set point closely, the adjusted
ramp times can be used for the partial stroke test. If this is not the case, repeat the full
stroke test with different ramp times until the valve position follows the set point (Fig. 16).