Samson 3730-3 Operating Instructions Manual page 72

Tests – Partial stroke test (PST)
x [%] x [%]
100
90
t [s]
Max. test duration,
user-defined
Maximum test
duration
exceeded or the
valve has not
moved before The valve position
reaching the max. exceeds 'x control
breakaway time.
â
Other cancellation causes: solenoid valve trig-
gered/forced venting active; Supply pressure
too low; Too much friction; Step start too large;
Change in set point; Current too low
â â
72
Step response settings: Step start, Step end, Tolerance limit of step
response, Settling time before test start, Delay time after step, Scan rate,
Number of step responses
Activation of ramp function
â
No
Cancellation conditions
x control value
Status classification (NE 107)
Observe start conditions
(see page 73 and page 74)
â
Target PST testing mode
â
PST Man
â
Start test
value'.
â
â
First PST after defining parameters
â
Analysis (NE 107)/
logged by operating hours counter
â
Yes
Ramp time (rising)
Ramp time (falling)
â
delta y-monitoring
PST/FST
â
â
Auto test
time
â
â
PST Auto*
â
= Reference
â
Start further PST
â
PST/FST
â
Reset PST
â
x [%]
â
100
90
PST tolerance band
value
The drive signal The valve
exceeds the position
comparative value deviation
given by the delta exceeds the PST
y-monitoring. tolerance band.
â â
Other cancellation causes: solenoid valve trig-
gered/forced venting active; Supply pressure
too low; Too much friction; Step start too large;
Change in set point; Current too low
â â
EB 8389 EN
t [s]
â