Samson 3730-3 - Page 72

72 EB 8389 EN
START-UP
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
* Note! The positioner is write-protected when tests are performed according to a schedule (on-site operation and operating software).
Activation of ramp function
â
â â
100
90
x [%]
t [s]
x [%]
No Yes
100
90
x [%]
t [s]
â
Ramp time (rising)
Ramp time (falling)
â
Cancellation conditions
Max. test duration,
user-dened
x control value
delta y-monitoring
value
PST tolerance band
Status classication (NE107)
PST/FST
Maximum test
duration
exceeded or the
valve has not
moved before
reaching the max.
breakaway time.
â
The valve position
exceeds 'x control
value'.
â
The drive signal
exceeds the
comparative value
given by the delta
y-monitoring.
â
The valve
position
deviation
exceeds the PST
tolerance band.
â
â
Observe start conditions
(see page73 and page74)
â
Auto test
time
â â
Target PST testing mode
â â
PST Man PST Auto*
â
Start test
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
First PST after dening parameters
= Reference
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
TEST/PROCESS
â
Start further PST
â â â â â â â
Analysis (NE107)/
logged by operating hours counter
PST/FST
â
Reset PST
Tests – Partial stroke test (PST)