Samson 373 Series, Operating Instructions Manual

Page 1: ...Positioners EXPERT Valve Diagnostics Operating Instructions EB 8388 EN Firmware version 1 4x Edition November 2006 Fig 1 Valve diagnostics with SAMSON TROVIS VIEW Operator Interface e g for Type 3730...

Page 2: ...m 13 2 5 Drive signal diagram 15 2 5 1 Steady state drive signal 15 2 5 2 Hysteresis test d5 17 2 6 End position trend 19 3 Tests MAN 21 3 1 Drive signal diagram steady state d1 22 3 2 Drive signal di...

Page 3: ...faults Owing to the numerous diagnostic tests EXPERT is able to generate classified status alarms on the state of the control valve The EXPERT diagnostics are completely in tegrated in the positioner...

Page 4: ...ess is running i e in manual mode instead as the positioner cannot follow the reference variable at the same time The valve is moved to a certain position de fined by the test settings and the valve m...

Page 5: ...d The default settings of these parameters are 4 Model Single acting 4 Booster Not present 4 Stuffing box Self adjustable These parameters do not need to be changed if the control valve also has these...

Page 6: ...rwritten If the reference graphs could not be plotted correctly or are incomplete Code 81 is is sued and saved in a non volatile memory The positioner can function properly after it has been initializ...

Page 7: ...ence variable automatic mode 4 Press once to cancel the tests MAN d1 drive signal diagram steady state d2 drive signal diagram hysteresis d3 static characteristic d4 step response and the test in stat...

Page 8: ...c log includes a title page and a list of all the data points including all their values and properties The title page contains all key information for clear identification of the printed log de vice...

Page 9: ...00 data points in the positioner In addition to the permanent plotting of data the plotting can be automatically trig gered when a start condition is fulfilled The travel condition setpoint or the opt...

Page 10: ...of the triggering condition The following parameters can be changed for this function 4 Trigger status Triggered by the travel condition setpoint and or solenoid valve condi tion forced venting 4 Sta...

Page 11: ...g function is activated Similar to the travel condition setpoint the variables w x e and y are logged at the adjusted scan rate and saved in the FIFO memory on triggering Additionally there is a pretr...

Page 12: ...n a non volatile memory The scan rate can be changed in the Scan rate short time param eter On changing the scan rate old data in the short term histogram are deleted The Average values x short parame...

Page 13: ...hanged in the Scan rate short time parameter On changing the scan rate old data in the short term histo gram are deleted The Average values e short parameter indi cates the class in which the last 100...

Page 14: ...re shown as a bar graph The Cycle counter histogram folder contains long term data i e measured data points are updated cyclically over the entire positioner service life and stored every 24 hours in...

Page 15: ...also pinpoints to one of these events having oc curred A reduced spring force or a control valve with the fail safe position Fail to close leads to the drive signal y shifting down wards with an ever...

Page 16: ...ions folders contain a table of the last ten measured data points Graphs The Steady state folder contains a common graph for long term short term and refer ence data The graph plotted using the ref er...

Page 17: ...If the test was interrupted due to a change in the reference variable the test is started again after waiting 30 seconds using the new operating point If the test is canceled again at this point due t...

Page 18: ...st has not yet been activated the graph for the reference data is represented by a straight line The diagram allows changes in y with the corresponding valve positions to be recognized Changes in fric...

Page 19: ...ed and time stamped by the oper ating hours counter in automatic mode when the valve moves to the lower end posi tion The measured data are stored in an FIFO memory that always stores 30 mea sured dat...

Page 20: ...e position over the forced venting option and with an actuator with AIR TO OPEN Graph versions Select Trend of valve end position folder to view a graph of the recorded end positions The reference val...

Page 21: ...nd help to pinpoint faults and to schedule predictive mainte nance work For reasons of safety the tests MAN can only be started when the positioner is in manual operating mode Select the operating mod...

Page 22: ...ull range of the valve The drive signal y is measured for each valve position x and stored in the positioner memory The necessary data set for the ref erence graph is automatically plotted and stored...

Page 23: ...l range of the valve and determines y for each valve po sition The valve is made to move to fixed nodes of the valve position x and the valve position is ramped up 1 correspondingly The drive signal y...

Page 24: ...ist of the valve positions that the valve moved to The recorded y are saved in the corre sponding subfolders Reference hysteresis Repetition value of hysteresis Test requirements 4 A successfully plot...

Page 25: ...ESt d3 allows the full range of the valve to be recorded in manual mode It is also possible to define a test range by selecting the Start and End parameters The ascendent and descendent are plotted wi...

Page 26: ...on x and the drive signal y are plotted until a steady state is reached This test is stored and analyzed in the positioner The reference variable w the setpoint devia tion e and time t are also stored...

Page 27: ...rive signal y are plotted in graphs over time in the Step response folder The Measured values subfolder contains all measured and analyzed parameters such as valve position setpoint drive signal setpo...

Page 28: ...played in the Positioner folder The following folders contain particularly in formative data for valve diagnostics 4 Positioner folder process data Information on the current process vari ables conden...

Page 29: ...ave any affect on the condensed status of the positioner The condensed status is displayed in the en gineering tool as well as on the positioner display as in the table below Furthermore the condensed...

Page 30: ...larms issued by EXPERT Note All additional alarms generated by EXPERT have the status No message by default On resetting the positioner parameters to their default settings Code 36 the status classifi...

Page 31: ...ror code can be confirmed by pressing the rotary pushbutton after selecting the corre sponding error code Resetting error codes as well as resetting op tions such as logging or the total valve travel...

Page 32: ...After an initialization has been successfully completed new reference measurements are automatically plotted and the existing refer ence data are overwritten The new refer ence data and the optimized...

Page 33: ...ation AUTO and tests MAN need to be reset when the positioner is attached to a different control valve After mounting the positioner on the new control valve perform a reset over Code 36 and re initia...

Page 34: ...steady state Data for short term and long term histograms Drive signal histogram hysteresis d5 Minimum time between tests start test Data for long term monitoring End position trend Measured values w...

Page 35: ...nge shift max OPEN Air leakage in the pneumatics Possibly exists test Check pneumatic actuator and connections for leakage Reset y x signature measured data Possibly too much test Possibly too much Re...

Page 36: ...below the reference line Zero point shift upwards monotonic Average value below the reference line Zero point fluctuates Average value below the reference line Mechanical connection linking positione...

Page 37: ...tuator Reset y x signature measured data Compression possible reduced test Seat leakage Possibly different Check plug and seat Reset y x signature measured data Reset e short term histogram Leakage to...

Page 38: ...e g Siemens PDM Various Siemens PDM Start reference test section 1 5 Statistical information AUTO refer to section 2 for description Data logger No numerical display No graphical display No numerical...

Page 39: ...haracteristic d3 Restricted numerical display 2 No graphical display Restricted numerical display 2 No graphical display Step response d4 Restricted numerical display 2 No graphical display Restricted...

Page 40: ...SAMSON AG MESS UND REGELTECHNIK Weism llerstra e 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 Internet http www samson de EB 8388 EN S Z 2007 10...