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EB 8389 EN

75

Tests

5.4 Partial stroke test (PST)

The partial stroke test (PST) is particularly
suitable for the status-oriented detection of
malfunctions in pneumatic shut-off valves. As
a result, the probability of failure on demand
(PFD) can be reduced and it may be possible
to extend maintenance intervals.
A shut-off valve normally in its end position
can be prevented from seizing up or getting
jammed. The initial breakaway torque must

first be overcome after the valve starts to

move from its end position. The initial break-
away torque depends on the plug/seat seal,
deposits on the plug, the process medium
and friction at the valve trim. After the initial
breakaway torque has been overcome, it
can be assumed that the valve is able to
close completely.

The recording of the test results additionally
allows an analysis of the dynamic control re-
sponse.
The partial stroke test can be performed
once (test immediately started) or, with an
on/off valve in automatic mode, regularly
(time-controlled), provided the start condi-

tions are met (see page 73 and
page 74):

−

A control valve is in the manual mode.

−

An on/off valve is in the manual or auto-
matic mode. In automatic mode, the test
is only started when the Set point w is
greater than the 'Limit fail-safe position'
(Code 49 - h2).

The following listed parameters are activated
while the partial stroke test is being per-
formed:

Fig. 12:

Diagnosis > Tests > Partial stroke test

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Содержание TROVIS 3730-3

Страница 1: ...ions EB 8389 EN Firmware version Edition August 2017 Series 3730 and 3731 Types 3730 2 3730 3 3730 4 and 3730 5 as well as Types 3731 3 and 3731 5 Electropneumatic Positioners EXPERTplus Valve Diagnos...

Страница 2: ...partment aftersalesservice samson de The mounting and operating instructions for the devices are included in the scope of delivery The latest documentation is available on our website www samson de Pr...

Страница 3: ...3 2 1 Condensed state at the fault alarm output 22 3 3 Logging 22 4 Statistical information 25 4 1 Open close on off valve 27 4 1 1 On off diagnosis 28 4 1 2 Analysis and monitoring 29 4 1 3 Resetting...

Страница 4: ...hysteresis 67 5 2 1 Analysis and monitoring 68 5 2 2 Resetting single status messages 69 5 3 Static characteristic 70 5 3 1 Resetting single status messages 71 5 4 Partial stroke test PST 75 5 4 1 Sta...

Страница 5: ...pe 3731 3 106 8 2 Type 3730 4 107 8 3 Types 3730 5 and 3731 5 107 9 Appendix 109 9 1 Code list 109 9 1 1 PROFIBUS parameter Type 3730 4 115 9 1 2 FOUNDATION fieldbus parameters Type 3730 5 Type 3731 5...

Страница 6: ...6 EB 8389 EN...

Страница 7: ...ot follow the set point Instead it is moved according to the test specifications Therefore the tests can only be started when the conditions in the plant allow it Qualifications of operating personnel...

Страница 8: ...hat operating personnel or third persons are not exposed to any danger Responsibilities of operating personnel Operating personnel must read and understand these operating instructions as well as the...

Страница 9: ...Settings for the EXPERTplus valve diagnostics can be made in the TROVIS VIEW software In online mode of this software the configuration and parameter settings take effect immediately in the connected...

Страница 10: ...ection 7 T No configuration required for monitoring Valve position x histogram Section 4 3 B Set point devia tion histogram Section 4 4 B Cycle counter histogram Section 4 5 B Trend of travel end posi...

Страница 11: ...terface Refer to the mounting and operating instruc tions of the positioner for a list of all param eters that can be changed at the positioner see Referenced documentation on page 8 2 2 Operation usi...

Страница 12: ...positioner adapts itself opti mally to the friction conditions and the signal pressure required by the control valve The positioner can be initialized using one of the following initialization modes m...

Страница 13: ...m steady state d1 Reference of drive signal diagram hysteresis d2 Reference of drive signal diagram steady state d1 Reference of drive signal diagram hysteresis d2 All reference values are overwritten...

Страница 14: ...rive signal NOTICE diagram hysteresis test d2 See section 5 2 and section 5 1 The valve moves through its working range during the reference test The reference test cannot be performed if the position...

Страница 15: ...the plant allow it e g plant shut down or service work in the workshop For NOTICE reasons of safety these tests except for par tial stroke testing can only be performed in the manual mode An active t...

Страница 16: ...8389 EN Operation nating sequence on the display See sec tion 4 1 2 5 2 Analysis Table 1 shows the diagnostic functions and their statements on the condition of the valve depending on the application...

Страница 17: ...nge Connection positioner valve Inner seat leakage Average set point deviation 4 4 page 40 Cycle counter histogram Stuffing box external leakage Dynamic stress factor 4 5 page 45 Drive signal diagram...

Страница 18: ...page 70 Partial stroke test PST Overshooting Dead time T63 T98 Types 3730 2 4 5 Types 3731 3 5 Rise time Settling time 5 4 page 75 Full stroke test FST Overshooting Dead time T63 T98 Types 3730 2 4 5...

Страница 19: ...densed state and temperature Settings Positioner Error control In formation on total valve travel with con figurable limits Positioner Start up Initialization List of initialization errors which are a...

Страница 20: ...nosis Status messages as well as Diagno sis Status messages Extended 3 1 1 Resetting status mes sages When a status message is generated you should first locate the source of the fault and take action...

Страница 21: ...e deleted The positioner must be re initialized after resetting Before mounting the positioner on a new control valve perform a reset by activating Code 36 Std and re initialize the position er Operat...

Страница 22: ...alarm output is activated 2 Settings Positioner Error control Fault alarm at condensed state Function check Code 32 Yes 3 Fault alarm at condensed state Mainte nance required Code 33 Yes Note 3 3 Log...

Страница 23: ...1 Parameters YES NO YES Measured values YES YES YES Data logger 2 3 NO YES YES Valve position x histogram YES YES YES Short term monitoring YES YES YES Set point deviation e histogram YES YES YES Shor...

Страница 24: ...NO NO YES Repetition test 1 3 YES NO YES Short term monitoring 1 3 NO YES YES Long term monitoring 1 3 NO YES YES Sound level monitoring 1 3 NO YES YES 1 Not Type 3730 4 2 Not Type 3730 5 1 6x 3 Not...

Страница 25: ...d and analyzed by the monitoring functions in Statistical information In addition a back ground hysteresis test can detect any chang es in friction The monitoring functions in Statistical infor mation...

Страница 26: ...rameters for partial stroke test see section 5 4 On off diagnosis Discrete set point analysis PST x w t s t 6 s 25 50 x w t s First analysis after defining parameters Reference PROCESS Breakaway time...

Страница 27: ...rts the valve moves to the fail safe position If the set point increases and exceeds Limit op erating point the valve moves to the Oper ating point The valve moves back to the fail safe position 0 in...

Страница 28: ...h1 1 0 0 to 100 100 Limit fail safe position Code 49 h2 1 0 0 to 20 0 12 5 Limit operating point Code 49 h5 1 55 0 to 100 0 75 0 3 Diagnosis Tests Partial stroke test See section 5 4 1 Not Type 3730...

Страница 29: ...alue by the amount entered in Limit value time analysis The current Valve end position rising differs from the reference value by the amount entered in Limit value travel analysis The current Valve en...

Страница 30: ...B DO 3 Trigger value Trigger band Trigger edge Trigger value Trigger band Trigger edge 1 Types 3730 2 3 Type 3731 3 2 Types 3730 4 5 3 Type 3730 5 100 measured values w x e y Pre trigger time Scan rat...

Страница 31: ...the positioner Failure of power supply of the external so lenoid valve 4 2 1 Permanent data logging 3730 2 3730 3 3731 3 3730 4 3730 5 3731 5 1 1 Function available in firmware 1 5x and lower The meas...

Страница 32: ...so leads to the mea suring values before the triggering event for the time selected being included in the 100 measured values per measured variable The Pre trigger time may include the value 100 x Sca...

Страница 33: ...r band and Trigger edge are met Trigger edge Low signal falling edge bottom band exit Bottom band limit Trigger value trigger band Trigger value Trigger band w x y e The conditions for starting a trig...

Страница 34: ...set point deviation 0 0 to 10000 0 1 s 99 0 1 s drive signal Trigger band 0 0 to 100 0 99 0 set point valve position set point deviation 0 0 to 10000 0 1 s 99 0 1 s drive signal Pre trigger time 0 0...

Страница 35: ...gger Selection Trigger 2 Trigger status Start trigger via set point int sol valve forced venting Trigger value 0 0 to 100 0 99 0 Trigger band 0 0 to 100 0 99 0 Pre trigger time 0 0 s to 100 x Scan rat...

Страница 36: ...ction Trigger 2 Trigger status Start trigger via discrete input 1 or start trigger via discrete input 2 Pre trigger time 0 0 s to 100 x Scan rate 0 0 s Trigger edge Low signal High signal 3 Scan rate...

Страница 37: ...sition classes The distribu tion showing how often the sound level oc curred within a valve position class is shown in a bar graph The Average value x long indicates the average class assignment of th...

Страница 38: ...osing position Mostly near max opening Mostly closing position Mostly max opening Type 3730 5 1 6x and Type 3731 5 2 Settings Positioner Diagnosis configuration Classification Shifting working range 1...

Страница 39: ...mmand Reset Travel histogram x This command resets all diagnostic parameters and measured da ta of the histogram and the short term moni toring By selecting and executing the command Reset Travel hist...

Страница 40: ...ion showing how often the set point deviation remained within a class is shown in a bar graph The Average value e long indicates the average class assignment of the set point deviation over the Observ...

Страница 41: ...and Type 3731 3 2 Settings Positioner Error control Classification report Extended Limit working range Down Up Modification impossible jammed Connection positioner valve No optimum travel transmissio...

Страница 42: ...eakage and Limit working range messages can be reset by selecting and executing the command Reset Set point deviation histogram e or Reset Set point deviation histogram e Short term The Connection pos...

Страница 43: ......

Страница 44: ...rhaps soon expected PROCESS Determining the cycle spans t s x 1 2 3 4 Determining the cycle height t s x 1 2 3 4 Dynamic stress factor Dynamic stress factor Dynamic stress factor 90 Dynamic stress fac...

Страница 45: ...changes direction again The positioner records the cycle height when the Stuffing box stem seal setting is set to Bellows seal The cycle height is the travel performed between two changes in direc ti...

Страница 46: ...cation External leakage 1 Setting only with Stuffing box Other 4 5 1 Analysis and monitoring Analysis of the histogram starts directly af ter the change to manual or automatic mode The load on the bel...

Страница 47: ...cuting the Reset Cycle counter histogram command all diagnostic parameters and measured data of the histo gram and the short term monitoring as well as the Dynamic stress factor are reset By selecting...

Страница 48: ...springs Leakage pneumatics Perhaps modified not enough Working at full capacity Perhaps too large existing PROCESS Working at full capacity Status classification NE 107 logged by operating hours count...

Страница 49: ...ackground re gardless of the operating mode selected Da ta logging does not need to be activated The positioner records the valve position x and its associated drive signal y in closed loop operation...

Страница 50: ...ctuator is mounted on the valve 2 No booster is mounted on the control valve 3 The valve operates as a control valve 4 A reference test has been performed see section 2 4 1 1 Settings Identification P...

Страница 51: ...positioner generates the Air supply message with the selected status classification The drive signal shifts downwards with a smaller gradient than in the reference graph pinpointing to a reduced sprin...

Страница 52: ...ately User defined Min time distance from test Cancellation condition Tolerance band of hysteresis Status classification NE 107 Friction PROCESS Much higher lower over whole range Much higher lower ov...

Страница 53: ...eresis allows an analysis in the change of the friction forces in Types 3730 2 3 and Types 3731 3 5 Data are recorded after the hysteresis test is activated A single test can be performed im mediately...

Страница 54: ...t the top or bottom limit of the working range the po sitioner generates the message Test infor mation Test at operating point not possi ble Short term monitoring To provide a short term trend the las...

Страница 55: ...position x leaves the Toler ance band of hysteresis during the test the test is immediately canceled and the positioner returns to closed loop opera tion If a change in set point w occurs which is gr...

Страница 56: ...mmand Reset Drive signal diagram hysteresis or Reset Drive signal diagram hysteresis short term By selecting and executing the command Reset Drive signal diagram hysteresis all the measured data of th...

Страница 57: ......

Страница 58: ...d Section 2 4 1 NO YES First zero point Reference Subsequent zero calibration over Code 6 ZP Zero calibra tion ZP shift monotone down up average above below reference NP alternate above below referenc...

Страница 59: ...the valve position x and the drive signal y together with the time stamp by the operating hours counter when the valve moves to the lower end position The new recorded valve posi tion is compared to...

Страница 60: ...t monotone up average be low reference Zero point alternate average below reference Type 3730 5 1 6x and Type 3731 5 3 Settings Positioner Diagnosis configuration Classification Observing end position...

Страница 61: ...est is being per formed Therefore it is important to check before starting a test whether the conditions in the plant or process allow the valve to move through its working range The tests provide a t...

Страница 62: ...est Reference Start test Test analysis Air supply Perhaps modified Perhaps not enough Working at full capacity Actuator springs Perhaps spring stiffness reduced bias reduced Working at full capacity L...

Страница 63: ...test the valve moves to various fixed valve positions distributed over the working range of the valve The drive signal y is measured for each valve position x and compared with the reference graph Th...

Страница 64: ...matics Perhaps existing TEST Perhaps too large TEST Actuator springs Spring stiffness may be reduced spring fail ure TEST Perhaps bias reduced TEST Working at full capacity TEST Type 3730 5 1 6x and T...

Страница 65: ...graph and then starts to rise almost steadily This pinpoints to a supply pressure that is in sufficient for the valve to move through its entire working range The positioner generates the Air supply m...

Страница 66: ...07 Friction MANUAL MODE TEST Start test Reference test completed see section 2 4 1 NO YES First test Reference Start test Test analysis Friction Much higher lower over whole range Much higher lower ov...

Страница 67: ...of the valve After moving to each valve position a ramp movement changing the valve travel by less than 1 is performed The change in drive signal y is measured for each valve position x and compared w...

Страница 68: ...band of hysteresis 1 0 to 5 4 Diagnosis Tests Drive signal diagram hysteresis Start test 1 Types 3730 4 5 and Type 3731 5 Operation Operating mode Positioner AO TRD 2 Types 3730 4 5 1 5x two single pa...

Страница 69: ...th time that the test is canceled the time entered in Min time distance from test is kept again If the analysis of the hysteresis pinpoints Friction the positioner generates a corre sponding status me...

Страница 70: ...ng and the defined test range The ascendent and descendent are plotted within the test range The response of the valve position x to the change in set point w is plotted in a graph The dead band is an...

Страница 71: ...Number of measurement values until turn back 1 to 50 50 3 Start test 1 Types 3730 4 5 and Type 3731 5 Operation Operating mode Positioner AO TRD Cancel the test by right clicking Stop test and select...

Страница 72: ...the max breakaway time The valve position exceeds x control value The drive signal exceeds the comparative value given by the delta y monitoring The valve position deviation exceeds the PST tolerance...

Страница 73: ...PST Man PST Auto t 6 s 25 50 x w t s PST not possible PST not possible PST not possible PST possible 1 3 4 1 2 3 4 1 2 3 1 3 Fail safe action of actuator fail safe position operating mode Operating p...

Страница 74: ...PST not possible PST 1 3 possible PST 1 2 3 possible Fail safe action of actuator fail safe position operating mode Operating point valve position according to set point 1 PST starts once 2 PST starts...

Страница 75: ...dium and friction at the valve trim After the initial breakaway torque has been overcome it can be assumed that the valve is able to close completely The recording of the test results additionally all...

Страница 76: ...e Settling time before test start has elapsed Starting from the Step start the valve moves to Step end The valve remains in this position for the time defined by the Delay time after step before perfo...

Страница 77: ...y result in overshooting To prevent this the drive signal y can be monitored and the test canceled in the event that an error is de tected delta y monitoring value The test is canceled as soon as the...

Страница 78: ...meters 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 3 Select classification for st...

Страница 79: ...time Code 49 A3 1 h to 2345 d NOTICE The positioner is write protected when tests are performed according to a schedule on site operation and operating software Code 0 reading OC and PST in alternat...

Страница 80: ...Tolerance limit of step response for the partial stroke test to start The test and its cancellation are described in section 5 4 while the test assessment is de scribed in section 5 4 3 5 4 2 Start tr...

Страница 81: ...e step height Dead time s T63 s T98 s Rise time s Settling time s Analysis of measured data ramp test Overshoot relative to the step height The results of the first partial stroke test are used as the...

Страница 82: ...ultimate test is deleted when another test is performed Operation Reset Reset PST 5 4 5 Step response The dynamic performance of the control valve can be tested by plotting its step re sponse The step...

Страница 83: ...EB 8389 EN 83...

Страница 84: ...s No 1 Yes Ramp time rising Ramp time falling Cancellation condition Max test duration user defined Status classification PST FST Maximum test duration or allowed time to reach full closed position ex...

Страница 85: ...ves through its entire working range The first step ends in the fail safe position As a result the second step starts from the fail safe position The change in travel can be performed ei ther in steps...

Страница 86: ...g cancellation con ditions is fulfilled Max test duration The test is canceled when the maximum permissible test du ration is reached Max breakaway time Types 3730 4 5 only The test is canceled when t...

Страница 87: ...er Current test Defining parameters 1 Switch to manual mode 2 Define parameters for full stroke test See Note concerning setting the FST diagnos tic parameters on page 88 3 Configure the cancellation...

Страница 88: ...mum transit time close Code 41 deter mined during initialization The Ramp time falling must be greater than the corresponding value for Mini mum transit time open Code 41 deter mined during initializa...

Страница 89: ...e selected status classifi cation Extended diagnosis Code 79 is activated regardless of the status classifica tion Diagnosis Status messages Extended PST FST The No test available status remains activ...

Страница 90: ...l so be transferred using a universal com mand Depending on the positioner the dynamic HART variables can be assigned by the DD or in TROVIS VIEW Settings Operation unit as shown in Table 4 Settings O...

Страница 91: ...Set point deviation e Absolute total valve travel Absolute total valve travel Binary input status 0 Not active 1 Active 255 Internal solenoid valve forced venting status 0 De energized 1 Energized 2...

Страница 92: ...uccessful Reset Reference test Reset Repetition test Alarm settings Select alarm limit Status classification NE 107 Alarm limits 1 2 3 Recommended 10 dB 15 dB 25 dB Alarm limit 2 exceeded Alarm limit...

Страница 93: ...exceeds one of the alarm limits Requirements for using the seat leakage detection 1 A leakage sensor is attached to the valve Refer to the standard mounting and operating instructions of the posi tio...

Страница 94: ...1 1 While the reference test is running the pa rameters listed below are automatically de activated Enable set point cutoff decrease Activation of ramp function Phase 1 The valve moves to eleven defin...

Страница 95: ...ence test is successfully completed If the Activation level is not reached after the valve has moved to all eleven newly de fined points then the change in sound pres sure level is too low In this cas...

Страница 96: ...Measured point 1 to Measured point 11 The valve moves to the user defined points in steps of 0 1 Measuring points must be rounded up to two deci mal places User defined points can be saved for other...

Страница 97: ...ted up If it is not possible to perform the repetition test the user defined alarm limits can be en tered see section 7 1 2 2 While the repetition test is running the pa rameters listed below are auto...

Страница 98: ...is subdi vided into eleven new measured points Each measured point is located at a distance of 0 03 to the next point The valve moves to the new points one after the other After reaching a measured p...

Страница 99: ...3 to 255 dB 10 dB Measured point change 0 00 to 100 00 1 0 00 2 0 10 3 0 20 4 0 03 5 0 04 6 0 05 7 0 06 8 0 07 9 0 08 10 0 09 11 1 00 3 Start repetition test 2 Type 3730 5 Operation Operating mode Po...

Страница 100: ...fter connecting the leakage sensor and performing the reference and repetition tests the positioner is able to pinpoint any seat leakage To do this it records the sound level in closed loop operation...

Страница 101: ...during long term monitoring see section 7 3 is used for monitoring Fig 18 Tight closing event 1 to Tight closing event 31 with all sound levels The No alarm release setting deactivates the alarm func...

Страница 102: ...with status classi fication selected for Alarm limit 3 exceed ed Diagnosis Status messages Extended Inner seat leakage 7 1 2 4 Resetting single status messages The repetition test diagnostic paramete...

Страница 103: ...sound level and last four recorded sound levels If this mean value deviates from the last mean value in short term monitoring by the amount entered in Activation point short term it is saved as the ne...

Страница 104: ...level trend over a long pe riod of time the long term monitoring con tains all the mean values saved in the short term monitoring since the last reset Long term average The average sound level calcul...

Страница 105: ...ions classes The distribu tion showing how often the sound level oc curred within a valve position class is shown in a bar graph Data are recorded in the background re gardless of the operating mode s...

Страница 106: ...anual mode or vice versa This function is not performed if the positioner is in the fail safe position mode Start data logger Activation of the binary input causes the data logger to start see section...

Страница 107: ...ntermediate position Condensed state In this setting the current condensed state according to NAMUR Recommen dation NE 107 is issued over OUT_D The status messages are assigned to the discrete value a...

Страница 108: ...2 Maintenance demanded 3 Maintenance alarm 7 Function check Condensed state and VST The positioner starts a single partial stroke test The test is performed using the settings in Code 49 d2 to Code 4...

Страница 109: ...ns performed since the last initial ization Read only d4 No of initializations The total number of initializations that have been performed since the last reset Read only d5 Zero limit 0 0 to 100 0 of...

Страница 110: ...et diAG 0 to 365 days After an adjustable time period the diagnosis data are reset auto matically according to the settings in Code 36 diAG Example A start up behavior of the plant which is untypical...

Страница 111: ...value 1 s The y monitoring reference value applies to the adjusted step values Code 49 d2 and Code 49 d3 and for the selected ramp times Code 49 d5 and Code 49 d6 The y monitoring reference value must...

Страница 112: ...es a sensible value that is not to be undercut if possible d6 Ramp time falling 0 to 9999 s 15 s 1 2 45 s 4 5 600 s 3 Ramp time for 100 to 0 travel falling of ramp function Initialization provides a s...

Страница 113: ...trol No YES Activates or deactivates PST tolerance band monitoring E6 PST tolerance band 0 1 to 100 0 5 0 The test is automatically canceled as soon as the Step end Code 49 d3 exceeds this percentage...

Страница 114: ...ending on the adjusted application type the positioner responds differently in automatic mode and there are differences in the diag nostic functions h1 Operating point 0 0 to 100 0 of the valve positi...

Страница 115: ...s the difference at which a message is gen erated h8 Limit value time analy sis 0 1 to 100 0 of the valve position 0 3 Types 3730 2 3 and Type 3731 3 only Travel limit for difference between reference...

Страница 116: ...ed 1 wait_cfg 2 wait_prm 3 data_exchg AO Function Block A A0 Target mode Desired operating mode 1 A1 Actual mode Current operating mode 1 A2 SP value Set point reference variable and its status A3 SP...

Страница 117: ...e Current valve position FVR and its status t9 AO Final_Position_ Value State Resource Block S S0 Resource target mode Desired operating mode 1 S1 Resource actual mode Current operating mode 1 DI1 Fun...

Страница 118: ...iscrete output variable and its status L7 DI2 Fb OUT_D State L8 DI2 FSAFE_VAL_D Default when the sensor registers an error L9 Simulate Simulation 1 Actual desired operating mode Operating mode Indicat...

Страница 119: ...ue Manipulated variable output value and its status A7 Out status A8 Block error Current block error PID Function Block PID P0 Target mode Target operating mode P1 Actual mode Current operating mode P...

Страница 120: ...t operating mode S1 Resource actual mode Current operating mode S2 Resource block error Current block error DI1 Function Block I0 Target Mode DI1 Target operating mode I1 Actual Mode DI1 Current opera...

Страница 121: ...more than 5 Autocorrection Code 59 Data section error in position er Fatal error Code 60 Error detected in safety relevant data Possible cause EMC disturbances The valve is moved to fail safe positio...

Страница 122: ...ion Code 67 Hardware error has occurred Confirm error If this is not possible return positioner to SAMSON for repair Program load error Code 77 A program has been loaded that does match the positioner...

Страница 123: ...de Code 6 Positioner detected during initialization that actuator permits no emergency control mode without feedback In case of a travel sensing error positioner vents Output or A1 in double acting ac...

Страница 124: ...n 4 6 2 section 5 1 2 Shifting working range The working range has shifted towards CLOSED or max OPEN position Rethink the working range Section 4 3 2 Leakage pneumatics A leak in the pneumatics exist...

Страница 125: ...or springs The spring stiffness is re duced spring failure Reduced spring compres sion The actuator springs are working at full capacity Check actuator springs Section 4 6 2 section 5 1 2 Inner seat l...

Страница 126: ...volatile memory Saved directly after they change Saved cyclically every 24 h Statistical information Open Close Limit value time analysis Limit value travel analysis Reference assessment Assessment D...

Страница 127: ...n Number of step responses Activation x control x control value Activation delta y monitoring del ta y monitoring value Activation PST toler ance band control PST tolerance band delta y monitoring ref...

Страница 128: ...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 r...

Страница 129: ...EB 8389 EN 129 Appendix Fig 21 Full stroke test to determine the ramp times in the partial stroke test The valve position follows the set point closely in the example...

Страница 130: ...130 EB 8389 EN...

Страница 131: ...e x Valve position x0 Valve position when the valve is tightly shut w Set point reference variable ATC Air to close ATO Air to open BI Binary input BSZ Operating hours counter FST Full stroke test INI...

Страница 132: ...SAMSON AG MESS UND REGELTECHNIK Weism llerstra e 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 samson samson de www samson de EB 8389 EN 2018 01 08 English...

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