Samson 3730-3 Operating Instructions Manual page 78

Tests
− 'Supply pressure/friction': An insufficient
supply pressure or excessive friction oc-
curred during the test.
− 'Difference w - step start too high': The
'Step start' is outside the range of oper-
ating point ± 'Tolerance limit of step re-
sponse'.
− 'Reference variable was changed': The
test was started according to a schedule
(time-controlled). Due to a set point
change before the step was started, the
'Step start' is outside the range of the op-
erating point ± 'Tolerance limit of step re-
sponse'.
− 'Current too low' (not Types 3730-4/-5)
Note
The 'Measured data storage out of memory'
reading (Maintenance alarm) is generated
when the 'Scan rate' is too low. After record-
ing 100 measured values per variable, log-
ging is stopped, but the test continues until it
is completed.
After the partial stroke test is canceled, the
'Status of partial stroke test' reading indi-
cates 'Not successful'. The reason for cancel-
lation is marked by the 'Maintenance alarm'
message in the Analysis of measured data
folder (> Current test).
Defining parameters
1. Define parameters for partial stroke test.
See Note concerning setting the PST di-
agnostic parameters on page 79.
2. Define parameters for cancellation con-
ditions.
78
3. Select classification for status message.
4. Start the partial stroke test.
The 'Test information' status indicates
'Test active'. 'd4' and 'tEST' are indicated
in alternating sequence on the positioner
display. 'Function check'
as the condensed state.
Diagnosis > Tests > Partial stroke test
1. − Step start (Code 49 - d2):
0.0 to 100.0 %, [95.0 %])/[100.0 %]
− Step end (Code 49 - d3):
0.0 to 100.0 % [90.0 %]/[95.0 %]
− Tolerance limit of step response:
0.1 to 10.0 %, [2.0 %]
− Activation of the ramp function
(Code 49 - d4): [No]/[Yes]
− Settling time before test start (Code 49 - d7):
1 to 240 s, [10 s]/[2 s]/[1 s]
− Delay time after step (Code 49 - d8):
1.0/2.0 to 240.0 s, [2.0 s]
− Scan rate (Code 49 - d9):
0.2 to 250.0 s, [0.2 s]/[0.8 s]
− Number of step responses: 1, [2]
Only when the ramp function is activated:
− Ramp time (falling) (Code 49 - d5):
0 to 9999 s, [15 s]/[45 s]/[600 s]
− Ramp time (rising) (Code 49 - d6):
0 to 9999 s, [15 s]/[45 s]/[60 s]
2. − Max. test duration
(Code 49 - E7): 30 to 25000 s, [30 s]/[90 s]
− Activation 'Max. breakaway time'
[Yes]
− Max. breakaway time
[7.5 s]
− Activation x control (Code 49 - E0): [No]/
[Yes]
is activated
1)
1)
1)
1)
2)
: No/
6)
: 0.0 to 25000.0 s,
3)
EB 8389 EN