Samson TROVIS SAFE 3730 Series, TROVIS SAFE 3730-6, 3730 Series, 3730-6 Operating Instructions Manual

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Page 1

Series 3730 TROVIS SAFE 3730-6 Electropneumatic

Positioner EXPERTplus Valve Diagnostics

Operating Instructions

EB 8389-1S EN

Firmware version 1.1x Edition May 2015

Page 2

Denition of signal words



DANGER!

Hazardous situations which, if not avoided, will result in death or serious injury

WARNING!

Hazardous situations which, if not avoided, could result in death or serious injury

2 EB 8389-1S EN

NOTICE

Property damage message or malfunction

Note:

Additional information

Tip:

Recommended action

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Contents

1 Description ....................................................................................................7

1.1 General ........................................................................................................7

1.2 Start-up .........................................................................................................9

1.3 Diagnostic functions .....................................................................................10

1.3.1 Type of application.......................................................................................11

1.3.2 Assessment ..................................................................................................11

2 Monitoring ..................................................................................................13

2.1 Status messages ...........................................................................................13

2.1.1 Resetting status messages .............................................................................13

2.1.2 Condensed state ..........................................................................................17

2.2 Logging .......................................................................................................18

3 Data logger ................................................................................................21

3.1 Permanent data logging ...............................................................................21

3.2 Triggered data logging ................................................................................. 22

3.2.1 Triggered by condensed state ........................................................................22

3.2.2 Triggered by set point, valve position, set point deviation or signal pressure ......23

3.2.3 Triggered by binary input .............................................................................24

3.2.4 Triggered by internal solenoid valve/forced venting ........................................25

3.2.5 Triggered by set point or internal solenoid valve/forced venting .......................25

4 Valve signature ...........................................................................................27

4.1 Reference graphs .........................................................................................28

4.1.1 Analysis and monitoring ...............................................................................28

4.2 Valve signature, signal pressure(x) .................................................................29

4.2.1 Analysis and monitoring ...............................................................................30

4.3 Course of supply pressure .............................................................................31

4.3.1 Analysis and monitoring ...............................................................................32

4.4 Valve signature, friction(x) ............................................................................33

4.4.1 Analysis and monitoring ...............................................................................34

4.5 Resetting single status messages ....................................................................34

5 On/off valve ...............................................................................................37

5.1 Diagnostics for on/off valve ..........................................................................38

5.2 Analysis and monitoring ...............................................................................39

5.3 Resetting single status messages ....................................................................40

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Contents

6 Valve position x histogram ..........................................................................41

6.1 Analysis and monitoring ...............................................................................42

6.2 Resetting single status messages ....................................................................42

7 Set point deviation e histogram ....................................................................44

7.1 Analysis and monitoring ...............................................................................45

7.2 Resetting single status messages ....................................................................46

8 Cycle counter histogram ..............................................................................49

8.1 Analysis and monitoring ...............................................................................50

8.2 Resetting single status messages ....................................................................50

9 Leakage sensor ...........................................................................................53

9.1 Start-up of the leakage sensor .......................................................................54

9.1.1 Manufacturer reference ................................................................................54

9.1.2 Process reference .........................................................................................57

9.2 Short-term monitoring ..................................................................................62

9.2.3 Resetting single status messages ....................................................................63

9.3 Long-term monitoring ...................................................................................63

9.3.1 Resetting single status messages ....................................................................63

9.4 Sound level(x) ..............................................................................................64

9.4.2 Resetting single status messages ....................................................................64

10 Course of end position .................................................................................67

10.1 Analysis and monitoring ...............................................................................68

10.2 Resetting single status messages ....................................................................68

11 Valve dead band ......................................................................................... 69

11.1 Resetting single status messages ....................................................................70

12 Partial stroke test (PST) ................................................................................73

12.1 Start triggered by the set point ......................................................................78

12.2 Start triggered by the binary input.................................................................78

12.3 Analysis and monitoring ...............................................................................79

12.4 Resetting single status messages ....................................................................80

13 Full stroke test (FST) .....................................................................................83

13.1 Analysis and monitoring ...............................................................................87

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Contents

13.2 Resetting single status messages ....................................................................87

14 SIL operator test ..........................................................................................88

14.1 Analysis and monitoring ...............................................................................90

15 Binary input ................................................................................................ 91

16 Dynamic HART

variables ............................................................................93

17 Appendix ....................................................................................................95

17.1 Code list ......................................................................................................95

17.2 Error messages and recommended corrective action .....................................102

17.3 Diagnostic data points saved in a non-volatile memory ................................. 107

17.4 Resetting parameters ..................................................................................108

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Overview

Throttling service

On/off service

No conguration required for monitoring

Travel histogram

u Section 6

Set point deviation histogram e

u Section 7

Cycle counter histogram

u Section 8

Course of end position

u Section 10

Note:

− Tests highlighted in red border require an initialization with valve signature

− Tests highlighted in gray can optimize the proper functioning of safety equipment according to IEC61508 and IEC61511, provided these tests are performed regularly.

Conguration required for diagnosis

Data logger

u Section 3

Valve signature

u Section 4

Packing

u Section 8

Leakage sensor

u Section 9

Valve dead band

u Section 11

Full stroke test (FST)

u Section 13

No conguration required for monitoring

Travel histogram

u Section 6

Set point deviation histogram e

u Section 7

Cycle counter histogram

u Section 8

Course of end position

u Section 10

Conguration required for diagnosis

Data logger

u Section 3

On/off diagnosis

u Section 5

Packing

u Section 8

Leakage sensor

u Section 9

Valve dead band

u Section 11

Partial stroke test (PST)

u Section 12

Full stroke test (FST)

u Section 13

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Description

1 Description

1.1 General

These instructions supplement the standard Mounting and Operating Instructions for the

TROVIS SAFE3730-6 Positioner (uEB8384-6S EN).

EXPERTplus is a diagnostic rmware inte-

grated into the positioner which allows the predictive, status-oriented maintenance of valves with pneumatic actuators.

EXPERTplus records the valve condition while the process is running (in automatic mode) and generates messages on the required maintenance work. In addition, numerous tests can be performed in manual mode to pinpoint emerging faults.

The diagnostic functions of EXPERTplus are completely integrated into the positioner. Diagnostic data are compiled, saved and ana-

lyzed in the positioner itself. Classied status

messages on the state of the valve are generated from the analysis.

All the parameter settings that are changed must also be downloaded onto the positioner to allow them to become effective.

Local operation

Some parameters can be changed at the positioner as well as over the operator interface. T

he positioner code of these parameters are written in parentheses. Refer to the Mounting and Operating Instructions of the TROVIS

SAFE3730-6 Positioner (EB8384-6SEN) for

a list of all parameters that can be changed at the positioner.

The operation described in the following sections illustrates operation using TROVISVIEW4. The default settings of the positioner and TROVIS-VIEW4 are written in square brackets [ ]. Settings highlighted in gray refer to operation using TROVISVIEW4.

Operation using TROVIS-VIEW 4/DD/DTM/

eDD

EXPERTplus allows the parameters to be viewed or changed using the TROVIS-

VIEW4 software or DD/DTM/eDD. TROVIS-VIEW4 · SAMSON operator inter-

face used to congure various SAMSON de-

vices

− DTM · Device type manager to describe the device and communication properties

− DD/eDD · Device description/enhanced device description

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DescriptionDescription

Initialization mode

â â â

MAX NOM MAN/MAN2

Initialization including valve

signature

ß à

Yes

START-UP

â â

Zero

Valve signature (D1)

Code 81 Code 81

ß Not successful

ß Successful

Automatic change to

AUTO operating mode

Throttling or on/off service

Later recording of

reference graphs

Operating mode = MAN

Valve signature (D1)

All reference values are overwritten!

ß Not successful

Operating mode = AUTO

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Description



1.2 Start-up

The positioner must be initialized to use the full scope of the valve diagnostics. During initialization the positioner adapts itself optimally to the friction conditions and the signal pr

essure required by the control valve. The positioner can be initialized using one of the following initialization modes: maximum

range (MAX), nominal range (NOM), manual setting 1 (MAN) and manual setting 2 (MAN2).

− Maximum range (MAX)

Initialization mode for simple start-up of valves with two clearly dened mechanical end positions, e.g. three-way valves

− Nominal range (NOM)

Initialization mode for all globe valves

− Manual setting 1 (MAN)

Initialization mode for globe valves re-

quiring OPEN position to be entered

manually

− Manual setting 2 (MAN2)

Initialization mode for globe valves re-

quiring the end positions (OPEN and

CLOSED positions) to be entered manually

The type of application, pressure limit and the start-up parameters required for the selected initialization must be entered to initialize the positioner.

Note:

Positioner start-up is described in detail in the associated Mounting and Operating Instructions (

uEB8384-6S EN

The monitoring of friction, supply pressure, leakage, actuator springs, course of end position and zero point shift requires additional reference tests of the valve signature to be performed. Refer to Section 4. The reference tests required for the diagnostic functions cannot be performed if the positioner has been initialized in the substitute calibration

(SUB) mode. By setting 'Initialization including valve signature' = Yes, the positioner re-

cords the reference data automatically after initialization.

Start-up

− Type of application (Code 49 - h0): Control valve, [On/off valve]

− Initialization mode (Code 6): [Maximum

range(MAX)], Nominal range (NOM), Manual setting 1 (MAN) or Manual setting 2 (MAN2)

− Initialization including valve signature (Code 48 - h0): [Yes]

− Pin position (Code 4): [Off], 17, 25, 35, 50, 70, 100, 200 mm, 90°

− Pressure limit (Code 16): 1.4 to [7.0] bar

During positioner initialization, the 'Kp level' and 'Tv level' are optimally set. If the posi-

tioner tends to overshoot impermissibly due to other disturbances, the proportional-action coefcient (Kp level) and derivative-action time (Tv level) can be adapted accordingly. Increment the derivative-action time until the desired behavior is reached. When the maximum value of 4 is reached for the derivative-action time, the proportional-ac-

tion coefcient can be reduced in steps.

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Description

NOTICE

Kp level changes affect the set point deviation.

After changing the proportional-action coef-

cient 'Kp level', we recommend to recalibrate the ne lter in the positioner. Use the 'Fine-tuning after Kp change' function for

this.

Start-up > Control parameters

− Proportional-action coefcient Kp level (Code 17): 0 to 17, [7]

− Derivative-action time Tv level (Code 18): Off, 1 to 4, [2]

− Fine-tuning after Kp change

1.3 Diagnostic functions

There are two different types of diagnostic functions:

1. Monitoring functions

Data are compiled, saved and analyzed by the positioner while the process is running without disrupting the process. The positioner follows the set point to po-

sition the valve. A classied status alarm

or fault alarm is generated if the positioner detects an event.

2. Dynamic tests

Similar to the monitoring function, data are compiled, saved and analyzed by the positioner. However, in this case, the valve position is not determined by the set point, but by the settings of the test. The dynamic tests can only be started when the conditions in the plant allow it (e.g. plant shutdown or service work in the workshop). For reasons of safety, the dynamic tests, except for partial stroke testing, can only be performed in the

MAN operating mode.

A dynamic test is stopped and the positioner changes to the fail-safe position when the electrical signal falls below a certain level or when the solenoid valve is triggered or the forced venting function is activated.

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1.3.1 Type of application

Different diagnostic functions are available depending on the type of application selected in EXPERTplus. The types of application 'Control valve' and 'On/off valve' are available. Depending on the type of application selected, the positioner behaves differently in the automatic mode (AUTO):

− Control valve

The positioner uses the set point to position the valve. The valve position (current position) appears in % on the display.

− On/off valve

Discrete analysis of the set point The valve position (current position) in % and O/C (Open/Close) appear in alternating sequence on the display. See

uSection 5.

Description

1.3.2 Assessment

Table 1 shows the diagnostic functions and their statements on the condition of the valve depending on the type of application.

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Description

Table 1: Diagnostic functions and test analysis

Control

Diagnostic functions

valve

Monitoring

Data logger • • Depending on trigger status

Valve signature •

On/off valve – • − Breakaway time

Valve position histogram

Set point deviation histogram

Cycle counter histogram

Leakage sensor • • − Seat leakage u 9 on page 53 Course of end

position

Dynamic tests

Valve dead band • • − Dead band u 11 on page 69 Partial stroke test

(PST)

Full stroke test (FST) • • − Overshooting

• Full scope of functions

U Function is performed, but not analyzed

– Function is not performed

On/off

valve Assessment See section

selected

− Change in friction

− Supply pressure

− Defective actuator springs

− Pneumatic leakage

− Transit time

− Valve end position

•

− Change in manipulated variable range

− Manipulated variable range

• • − Manipulated variable range limitation

− Seat leakage

− Positioner-valve linkage

− Average set point deviation

• • − Packing leakage

− Dynamic stress factor

• • − Course of end position

− Zero shift

• • − Overshooting

− Dead time

− T86

− Settling time

− Dead time

− T86

− Settling time

u 3 on page 21

u 4 on page 27

u 5 on page 37

u 6 on page 41

u 7 on page 44

u 8 on page 49

u 10 on page 67

u 12 on page 73

13 on page 83

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Monitoring

2 Monitoring

2.1 Status messages

The valve diagnostics integrated into the po-

sitioner generates classied status messages.

Messages generated from the analysis of the

diagnosis can be classied according to the

possible causes. See u Section 4 to 13.

The following classications are possible:

− No message

If an event is classied as “No message”,

this event does not have any affect on the condensed state.

− Function check

Test or calibration procedures are performed in the positioner. The positioner is temporarily unable to perform its control task as long as the procedure is taking place.

− Maintenance request/maintenance re- quired

The positioner still performs its control task (with restrictions). A maintenance demand or above average wear has been determined. The wear tolerance will soon be exhausted or is reducing at a faster rate than expected. Maintenance is necessary in the medium term.

− Out of specication

The positioner is running outside the

specied operating conditions.

− Failure

The positioner cannot perform its control task due to a functional fault in the positioner itself or in one of its peripherals or

an initialization has not yet been successfully completed.

You can view these messages in TROVIS-

VIEW4 in the Diagnostics folder (> Monitor- ing) and its subfolders. The 'Positioner status', 'Valve status', 'Actuator status' and 'Valve position status' messages provide a

condensed state of the status messages of each subfolder.

2.1.1 Resetting status messages

When a status message is generated, you

should rst locate the source of the fault and

take action to remedy it. For recommended action concerning the sta-

tus messages see u Section 17.2. Status messages can be reset individually or

using the reset function. Table 2 on page 15 contains an overview on how the diagnosis can be reset. Resetting is performed in the Diagnostics folder (> Service/maintenance > Reset).

If you want to keep measured data and the analysis after resetting the positioner, it is possible to upload them onto a computer.

Resetting single status messages

− Status messages represented by a code

in the positioner can be conrmed at the

positioner itself. Select the error code

and conrm it by pushing the rotary

pushbutton. See the standard instructions of the positioner u EB 8384-6S EN.

− On resetting histograms and diagrams, the data for short-term monitoring are also reset.

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Monitoring



− Resetting measured data does not cause the diagnostic parameters and reference value to be reset as well.

− The positioner does not need to be re-ini- tialized after resetting.

Reset measured diagnostic data

Code 36 - Diag

− Parameters are reset as described in u Section 17.4.

− Resets diagnostics assessment.

− Reference values remain unchanged.

− Status classication and data logs re- main saved.

− The positioner does not need to be re-ini- tialized after resetting.

− If the diagnostic data are to be reset at regular intervals, enter the time in "Desired time until ‘Reset measured diagnostic data" (Code 48 - h3). The setting "00:00:00" causes the resetting at regular intervals to be deactivated.

Reset start-up parameters

Code 36 - Std

− Parameters are reset as described in

u Section 17.4.

− Resets diagnostics assessment.

− Reference values are deleted.

− Status classication remains unchanged.

− Data logs are reset.

− The positioner must be re-initialized after resetting.

Reset to default settings

Code 36 - DS

− Parameters are reset as described in

u Section 17.4.

− Resets diagnostics assessment.

− Reference values are deleted.

− Status classication and data logs are deleted.

− The positioner must be re-initialized after resetting.

Note:

Before mounting the positioner on a new control valve, perform a reset by selecting the command 'Reset to de-

fault settings' (Code 36 - DS) and re-

initialize the positioner.

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Monitoring

Table 2: Resetting the diagnosis

Resetting

single status

messages

Reference graphs

Data logger Conguration and measured values NO YES YES YES

Valve signature Signal pressure(x) Measured values YES YES YES YES

On/off valve Conguration YES NO YES YES

Valve position x histogram Measured values YES YES YES YES

Set point deviation e histogram Measured values YES YES YES YES

Cycle counter histogram Measured values YES YES YES YES

Leakage sensor Short-term monitoring 'Sensitivity sound level'

Course of lower end position Measured values YES YES YES YES

Valve dead band Conguration and

Partial stroke test (PST) Conguration and

Valve signature NO NO YES YES

Leakage sensor Manufacturer reference YES NO YES YES

Process reference YES NO YES YES

Course of supply pressure Conguration NO NO YES YES

Measured values YES YES YES YES

Friction(x) Measured values YES YES YES YES

Measured values YES YES YES YES

Short-term monitoring 'Sampling time' and

measured values

Short-term monitoring 'Sampling time' and

measured values

Short-term monitoring Measured values YES YES YES YES

and measured values

Long-term monitoring Measured values YES YES YES YES

Sound level(x) Measured values YES YES YES YES

Reference value YES NO YES YES

measured values

* Except for 'Sampling time' parameter

YES YES YES YES

YES NO* YES YES

Code 36

Diag Std DS

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Monitoring

Resetting

single status

messages

Full stroke test (FST) Conguration and

measured values

* Except for 'Sampling time' and 'Max. test duration' parameters

Alarm settings NO See uSec.17.4

Status classication according to NAMUR107 NO NO NO YES

All logged messages, see u Section 2.2 YES NO YES YES

Operating hours counter NO NO NO NO

Device in operation NO NO YES YES

Device switched on since initialization NO NO YES YES

Device in operation since initialization NO NO YES YES

YES NO* YES YES

Code 36

Diag Std DS

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Monitoring



2.1.2 Condensed state

To provide a better overview on the condition of the positioner, all status messages are summarized in a condensed state which is

made up from a summary of all classied

messages in the positioner. The status message with the highest priority determines which condensed state is set.

The condensed state appears in TROVIS-

VIEW4 on the right-hand side of the info

bar and in the Measured process values folder. See u Table 3 for a description of the icons and their meaning.

Additionally, the condensed state can be used to trigger the data logger. See uSection 3.2.1.

Note:

The condensed state is marked by until the positioner data have been uploaded.

The condensed state can be read in the positioner display in Code 48 - d6. See u Table

Condensed state at the fault alarm output

The condensed state also be read out at the fault alarm output if one of the following conditions occurs:

1. Condensed state 'Failure' is activated.

2. Condensed state 'Function check' is activated and the fault alarm output is activated.

3. Condensed state 'Maintenance required'

or 'Out of specication' is activated and

the fault alarm output is activated.

Table 3: Condensed state reading

Status message TROVIS-VIEW 4/DTM Positioner Priority

Failure

Function check

Out of specication

Maintenance request/ maintenance required

No message, OK

EB 8389-1S EN 17

red

orange

yellow

blue

green

Text e.g. TESTING, TUNE or

TEST

blinking

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Monitoring



Device settings > Alarm settings

− Fault alarm at condensed state 'Function

check' (Code 32): Yes

3. − Error message in case of 'Maintenance re- quired' and 'Out of specication' con-

densed states (Code 33): Yes

2.2 Logging

The last 30 generated messages are saved in the positioner with a time-stamp (logged by the operating hours counter) and with details on how long the message exists.

You can view these messages in TROVISVIEW4 in the Diagnostics folder (> Monitor- ing > Logging).

Logging starts automatically 15 minutes after initialization. It does not need to be activated by the user.

Messages are logged when:

− Their status classication is not 'No mes-

sage'.

− Their recording in the logging is activat- ed.

− The 'Internal solenoid valve/forced vent- ing/supply pressure' message is only additionally logged when the time entered

in 'Min. interval for new logging of internal solenoid valve' has elapsed between the generation of two 'Internal solenoid valve/forced venting/supply pressure'

messages.

Note:

Logging can only be deactivated when

the associated status classication is set to 'No message'.

Device settings > Alarm settings > Status classication > Logging

− Supply pressure: [Yes], No

− Change in friction: [Yes], No

− Seat leakage: [Yes], No

− Packing leakage: [Yes], No

− Pneumatic leakage: [Yes], No

− Defective actuator springs: [Yes], No

− Manipulated variable range limitation: [Yes],

− Course of end position: [Yes], No

− Positioner-valve linkage: [Yes], No

− Manipulated variable range: [Yes], No

− Change in manipulated variable range: [Yes],

− Partial stroke test (PST) [Yes], No

− Full stroke test (FST): [Yes], No

− On/off valve: [Yes], No

− Code 50-58, 61, 63, 76, 81: [Yes], No

− Binary input: [Yes], No

− Data logger: [Yes], No

− Internal solenoid valve/forced venting/supply

pressure: [Yes], No

− Min. interval for new logging of internal solenoid valve: 0 to 5000 s, [300 s]

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The following messages are not logged if they are generated due to a hardware error:

− Packing leakage

− Pneumatic leakage

− Manipulated variable range limitation

− Course of end position

− Positioner-valve linkage

− Manipulated variable range

− Change in manipulated variable range

In this case, only the original hardware error is logged:

− x > range (Code 50)

− Internal solenoid valve/forced venting/ supply pressure (Code 54)

− Transit time not reached (Code55)

− Inconsistent data memory (Code 59)

− Internal device error (Code 60)

− x signal (Code 62)

− i/p converter (Code 64)

− Hardware (Code 65)

Monitoring

EB 8389-1S EN 19

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Monitoring

Data logger

â â

Permanent Triggered

â â

Sampling time

Start

START-UP

100 measured val-

(w, x, e, p

Function

â â â â â

Con-

densed

state

â â â

Trigger condition

ues

) â

out

Triggered by

, x, e

w or p

out

Trigger value

Trigger band

Trigger condition

Trigger lead time

Sampling time

Start

Solenoid

valve/ forced

venting

w or solenoid

valve/forced

venting

Trigger value

Trigger band

Trigger condition

Trigger event

Logged by operating hours

counter

â â

PROCESS

Measured values (w, x, e, pout) before trigger

event

(Number = Trigger lead/Sampling time)

Measured values (w, x, e, pout) after trigger event

(Number = 100 – Trigger lead/Sampling time)

Total 100 measured values (w, x, e, pout)

The data logger is started by the software, e.g. TROVIS-VIEW 4

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Data logger



3 Data logger

The data logger records the measured variables (valve position x, set point w, set point deviation e and signal pressure p corded data are plotted against time in a graph.

Note:

The data logger is interrupted and must be reactivated when one of the following events occurs:

−

Failure of power supply of the positioner

−

Failure of power supply of the external solenoid valve

). The re-

out

3.1 Permanent data logging

The measured variables are logged at the

rate dened in 'Sampling time' and saved in

a circular buffer, which holds 100 data points per measured variable at one time.

Note:

You can read the measured data

logged over the past 24 hours from

the 'Data logger' graph when the Diagnostics folder (> Data logger) is left

open over this period.

Fig. 1: Diagnostics > Data logger

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Data logger



Dening parameters

1. Select 'Permanent' (Function).

2. Enter sampling time.

3. Start data logger.

The 'Test information' status indicates 'Test active'.

Diagnostics > Data logger

− Function: [Permanent]

2. − Sampling time: 0.2 to 3600.0 s, [1.0 s]

3. − Start data logger

Note:

Right-click 'Cancel data logger' and select 'Execute' to stop the data logger ('Test information' = 'Test not active').

3.2 Triggered data logging

Measured values are saved in a circular buf-

fer after the event dened in 'Triggered by'

has occurred (see u Section 3.2.1 to 3.2.5). The event that has triggered data logging is recorded. Data logging is terminated after 100 measured values per measured variable have been saved in the circular buffer. The

'Sampling time' determines the time between recordings. A 'Trigger lead time' greater

than 0 also leads to the measuring values before the triggering event for the time selected being included in the 100 measured

values per measured variable. The 'Trigger lead time' may include the value 100 x 'Sampling time' at the maximum.

Dening parameters

1. Select 'Triggered' (Function).

2. Select the triggering event.

3. Enter sampling time.

4. Start data logger.

The 'Test information' status indicates 'Test active'.

When the data logging is nished, the Progress bar indicates 'Memory full, data recording completed'.

Note:

Right-click 'Cancel data logger' and select 'Execute' to stop the data logger ('Test information' = 'Test not active').

3.2.1 Triggered by condensed state

The measured values are included in the triggered event when the condensed state dened in 'Triggered by condensed state' arises.

Note:

If 'Function check' is selected as the condensed state ('Triggered by condensed state'), data are logged when a dynamic test starts. Data from each test start are logged.

Diagnostics > Data logger

− Function: Triggered.

2. − Sampling time: 0.2 to 3600.0 s, [1.0 s]

3. − Triggered by: Condensed state

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Data logger

rigger band

w, x, y, e

ger band

w, x, y, e

rigger band

w, x, y, e

− Trigger lead time:

0.0 s to 100 x 'Sampling time', [20.0 s]

− Triggered by condensed state: No message, Function check [Maintenance required], Maintenance demanded, Out of specication, Failure

4. − Start data logger

3.2.2 Triggered by set point, valve position, set point deviation or signal pressure

The measured values are included in the triggered data logging when the conditions for the selected measured variable (set point w, valve position x, set point deviation e or signal pressure p

'Trigger band' and 'Trigger condition' are

met.

'Trigger condition' = Decreasing signal/ lower band value undercut

) dened in 'Trigger value',

out

'Trigger condition' = Increasing signal/ upper band value exceeded

Upper band limit = Trigger value Trigger value

Trigger band

+ ½ Trig

The conditions for starting a trigger event are met when the value falls below the limit

('Trigger value' – ½ 'Trigger band').

'Trigger condition' = Band exit

Upper band limit = Trigger value + ½ T

Trigger value

Lower band limit = Trigger value - ½ T

Trigger band

Trigger value Lower band limit = Trigger value – ½ T

er band

Tri

The conditions for starting a trigger event are met when the value falls below the limit

('Trigger value' – ½ 'Trigger band') or exceeds the limit ('Trigger value' + ½ 'Trigger band').

The conditions for starting a trigger event are met when the value falls below the limit

This function is only active when 'Trigger band' ≠ 0.

('Trigger value' – ½ 'Trigger band').

EB 8389-1S EN 23

Page 24

Data logger

ger band

w, x, y, e

'Trigger condition' = Band entry

Upper band limit = Trigger value Trigger value Lower band limit = Trigger value - ½ Trigger band Trigger band

+ ½ Trig

The conditions for starting a trigger event are met when the value exceeds the limit

('Trigger value' – ½ 'Trigger band') or falls below the limit ('Trigger value' + ½ 'Trigger band').

This function is only active when 'Trigger band' ≠ 0.

Diagnostics > Data logger

− Function: Triggered

2. − Triggered by: Valve position, set point devi- ation, signal pressure or set point

− Trigger value:

0.0 to 100.0 %, [99.0 %] (set point, valve position, set point deviation)

0.0 to 7000.0 mbar, [99.0 mbar] (signal pressure)

− 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)

− Trigger lead time:

0.0 s to 100 x 'Sampling time', [20.0 s]

− Trigger condition: [Decreasing signal/lower band value undercut], Increasing signal/up-

per band value exceeded, Band exit, Band

entry

3. − Sampling time: 0.2 to 3600.0 s, [1.0 s]

4. − Start data logger

3.2.3 Triggered by binary input

This setting is only active when a binary input is installed in the positioner. If this is not

the case, the Progress bar indicates 'Cannot start data logger – trigger cannot be set'.

The measured values are included in the triggered data logging when the state of the binary input changes.

Diagnostics > Data logger

− Function: Triggered

2. − Triggered by: Binary input

− Trigger lead time:

0.0 s to 100 x 'Sampling time', [20.0 s]

3. − Sampling time: 0.2 to 3600.0 s, [1.0 s]

4. − Start data logger

24 EB 8389-1S EN

Page 25

Data logger

3.2.4 Triggered by internal solenoid valve/forced venting

This setting is only active when an internal solenoid valve/forced venting is installed in the positioner. See 'Internal solenoid valve/

forced venting' reading. If this is not the case, the Progress bar indicates 'Cannot start data logger – trigger cannot be set'.

The measured values are included in the triggered data logging when the solenoid valve is triggered or the forced venting is activated.

Diagnostics > Data logger

− Function: Triggered

2. − Triggered by: Internal solenoid valve/

forced venting

− Trigger lead time:

0.0 s to 100 x 'Sampling time', [20.0 s]

3. − Sampling time: 0.2 to 3600.0 s, [1.0 s]

4. − Start data logger

tions dened in 'Triggered by internal solenoid valve/forced venting“ or 'Triggered by set point' are met.

Diagnostics > Data logger

− Function: Triggered

− Triggered by: Set point or internal solenoid

valve/forced venting

− Trigger value: 0.0 to 100.0 %, [99.0%]

− Trigger band: 0.0 to 100.0 %, [99.0 %]

− Trigger lead time:

0.0 s to 100 x 'Sampling time', [1.0 s]

− Trigger condition: [Decreasing signal/lower band value undercut], Increasing signal/up-

per band value exceeded, Band exit, Band

entry

3. − Sampling time: 0.2 to 3600.0 s, [20.0 s]

4. − Start data logger

3.2.5 Triggered by set point or internal solenoid valve/ forced venting

This setting is only active when an internal solenoid valve/forced venting is installed in

the positioner. See 'Internal solenoid valve/ forced venting' reading. If this is not the case, the Progress bar indicates 'Cannot start data logger – trigger cannot be set'.

The measured values are included in the triggered data logging when one of the condi-

EB 8389-1S EN 25

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Data logger

Valve signature

Requirements:

– Actuator: Single-acting

– Type of application: Control valve

Only applies to rst start-up after reset with Code 36 –

DS or Std.

Initialization including valve signature

â à

Start initialization

Valve signature recording

START-UP

Valve signature, signal pressure(x) Course of supply pressure Valve signature, friction(x)

â â

Alarm settings Recording threshold

Alar

m settings

ATC ATO and ATC

Zero limit,

lag time

Lower limit Upper limit

Status classication (NE 107) Status classication (NE 107) Status classication (NE 107)

Zero

x0 > (ZP

+ Zero limit)

Init

x0 < (– Zero limit)

Spring pre-load

ing

Reduced spring pre-loading

essure Change in friction

Supply pr

Not

available

Too low

Perm.

Too high

limit exceeded

â â â â â â

Analysis (NE 107)/logged by

operating hours counter

PROCESS

Zero

Defective actuator

springs

Analysis (NE 107)/logged by

operating hours counter

Analysis (NE 107)/logged by

operating hours counter

Supply pressure status Change in friction

Min. supply pressure

Max. supply pressure

Dwell time (supply pressure

< 1.0bar)

l time (supply pressure

Dwel

> 7.0bar)

Valve signature

canceled

Not successful

Lower in total range Lower/higher in mid-

position Lower/higher near

max. OPEN position

Lower/higher near CLOSED position

eset 'Pressure sensor monitoring values'

26 EB 8389-1S EN

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Valve signature



4 Valve signature

The valve signature plots the signal pressure p

as a function of valve position x.

out

All diagnostic functions dependent on the signal pressure are based on the valve signature, e.g. to detect pneumatic leakage or to reveal an excessively high or low supply pressure.

Note:

Additionally, the pneumatics are monitored using the 'Leakage limit' param eter, which is adjustable between 0 and 100% in the Device settings fold- er (> Alarm settings). The positioner generates the 'Pneumatic leakage' message whenever the leakage ex

ceeds this limit value. 'No message' is

assigned by default.

Requirements

1. A single-acting actuator is mounted on the valve.

2. The valve operates as a control valve.

Device settings > Actuator

− Principle of operation (Code 48 - d11):

Single-acting

Start-up

− Type of application (Code 49 - h0):

Control valve

To perform monitoring while the process is

running, the reference graph must rst be

plotted.

Fig. 2: Start-up > Reference graphs > Valve signature

EB 8389-1S EN 27

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Valve signature



4.1 Reference graphs

During the plotting of the reference graph (Fig. 2), the valve is moved very slowly from the end position at which no pressure is applied to the actuator to the position at which the maximum air signal is applied to the actuator. The valve is then moved back again to its end position. During which, the positioner switches to open-loop control (control without feedback).

The sensitivity of reference graph plotting de-

nes at which speed the valve is moved. The

time span how long the reference graph is to be plotted depends on the sensitivity select-

ed. Select 'High' for valves with small bench

ranges and/or high friction. After the reference graph has been plotted,

the recorded data points for signal pressure p

and valve position x are converted into

out

xed points.

Note:

The valve positions cannot be predicted in open-loop control (control without feedback). The reference graph may differ for the same valve after each logging.

Dening parameters

The reference graph is automatically plotted

after initialization when 'Initialization including valve signature' = Yes.

Start-up

− Initialization including valve signature (Code 48 - h0): [Yes]

The reference graph can also be plotted separately outside initialization.

1. Switch to manual mode.

2. Select 'Sensitivity' from the drop-down list.

3. Start test.

The 'Test information' status indicates 'Test active'. 'D1' and 'TEST' are indicat-

ed in alternating sequence on the positioner display.

'Function check'

is activated as the

condensed state.

Start-up

− Enter operating mode (Code 0): Manual

2.Start-up > Reference graphs > Valve

signature

− Sensitivity: Low, [Medium], High

3. − Start test

4.1.1 Analysis and monitoring

The positioner records the data for lling and

venting the actuator. It then determines the characteristic values listed below:

− 'Mean hysteresis': Average hysteresis

(average signal pressure change Δp

relation to the spring range)

− 'Min. hysteresis': Lowest possible hystere- sis (minimum signal pressure change

Δp

in relation to the spring range)

out

− 'Max. hysteresis': Highest possible hys- teresis (maximum signal pressure change

Δp

in relation to the spring range)

out

28 EB 8389-1S EN

Page 29

Valve signature



− 'Detected lower spring range value': Sig- nal pressure p

lled with the minimum amount of air

− 'Detected upper spring range value': Sig- nal pressure p

lled with the maximum amount of air

The 'Valve signature canceled' message is

generated if the test is canceled.

Start-up > Initialization result

− Valve signature canceled (Code 81): , , ,

The 'Test status' reading indicates the reason

why the test was canceled:

− No supply pressure: The supply pressure

was under 500mbar during the test.

− Valve moved too quickly. Recommended action: Increase sensitivity

− Position at p air): (1) Even though the pressure was in-

creased in steps from 0bar to the maximum amount of air for lling the actua-

tor, the valve was not able to reach the maximum position in closed-loop operation. (2) The minimum valve position without tight-closing is below 96%. Recommended action: Increase supply pressure.

− Position at p (1) Even though the pressure was reduced in steps from the maximum amount of air for lling the actuator, the valve was not able to reach the minimum

when the actuator is

out

when the actuator is

out

not reached (lling with

max

not reached (venting):

min

position in closed-loop operation. The valve might be jammed. (2) The minimum valve position without

tight-closing is above 4%.

− Time-out

− Double-acting actuator

− Internal error

− Current too low

− Internal solenoid valve/forced venting triggered

− SUB initialization

4.2 Valve signature, signal pressure(x)

The positioner records the data for lling and

venting the actuator during closed-loop operation. The recorded data can be directly compared with the reference graph. Additionally, the minimum, maximum and current supply pressure are shown in the graph.

Data are recorded in the background regardless of the operating mode selected if a reference graph has already been plotted. Data logging does not need to be activated.

Note:

The positioner determines the minimum and maximum supply pressure while plotting the reference graph. The current supply pressure may fall below the minimum supply pressure and exceed the maximum supply pressure.

Dening parameters

1. Record reference graph. u Section 4.2.

EB 8389-1S EN 29

Page 30

Valve signature

2. Set the limit for zero monitoring in control valves with closed position ATC (air to close).

3. Select classication for status messages. See u Section 4.2.1.

Device settings > Alarm settings

− Zero limit (Code 48 - d5):

0.0 to 100.0 %, [5.0 %]

− Lag time: 1 to 9999 s, [30 s]

3.Device settings > Alarm settings > Status

classication > Positioner

− Zero (Code 58):

Device settings > Alarm settings > Status classication > Actuator

Defective actuator springs

− Reduced spring pre-loading:

, [ ], ,

[ ], , ,

4.2.1 Analysis and monitoring

If the monitoring line has a smaller gradient than the reference line, this pinpoints to a reduced compression of the actuator springs.

Diagnostics > Monitoring > Actuator

− Defective actuator springs:

Valves with ATC (air to close) closed position

In valves with ATC closed position, the positioner generates a zero error when the valve position in the tight-closing position is larger than the sum of the initialization zero points

and 'Zero limit' or smaller than the negative 'Zero limit' after the adjusted 'Lag time' has

elapsed.

Diagnostics > Monitoring > Positioner

− Zero (Code 58):

, , ,

Fig. 3: Diagnostics > Monitoring/tests > Valve signature > Valve signature, signal pressure(x)

30 EB 8389-1S EN

Page 31

Valve signature

4.3 Course of supply pressure

During control-loop operation, ve values of

the supply pressure are recorded and saved in a circular buffer. A new supply pressure is recorded and saved in the circular buffer when it deviates from the last value plotted in

the graph by the amount entered in 'Recording threshold'.

Data are recorded in the background regardless of the operating mode selected. Data logging does not need to be activated. To

monitor the limits ('Lower limit' and 'Upper limit'), the corresponding limit must be activated rst. The limits are automatically deter-

mined while the valve signature is being

plotted. Alternatively, user-dened limits can

be entered.

Dening parameters

1. Dene 'Recording threshold'.

2. Enter limits for monitoring. See u Section 4.3.1.

3. Select classication for status messages. See u Section 4.3.1.

1.Diagnostics > Monitoring/tests > Valve

signature > Course of supply pressure

− Recording threshold:

0.10 to 14.00 bar, [0.50 bar]

Device settings > Alarm settings

− Activate lower limit: [Yes], No

− Lower limit: [0.0] to 7.0 bar

− Activate upper limit: Yes, [No]

− Upper limit: [0.0] to 7.0 bar

Fig. 4: Diagnostics > Monitoring/tests > Valve signature > Course of supply pressure

EB 8389-1S EN 31

Page 32

Valve signature

3.Device settings > Alarm settings > Status

classication > Supply pressure

− Permissible limit exceeded: , , , [ ]

− Too high: , [ ], ,

− Fluctuates: [ ], , ,

− Too low: , [ ], ,

− Not available: , , , [ ]

4.3.1 Analysis and monitoring

The positioner generates the 'Supply pressure status' message with the dened status classication.

− 'Too high' if the supply pressure exceeds the 'Upper limit'.

− 'Not available' if the supply pressure falls below 0.1bar.

− 'Too low' if the supply pressure exceeds the 'Lower limit'.

− 'Permissible limit exceeded' if the supply pressure exceeds 7.0bar.

A uctuating supply pressure is recognized

by the positioner whenever the supply pres-

sure continuously falls below the 'Lower limit' and rises above the 'Upper limit'. In such cases, the positioner generates the 'Supply pressure status' message with the dened status classication.

− Min. supply pressure

− Time stamp of min. supply pressure

− Max. supply pressure

− Time stamp of max. supply pressure

− Dwell time (supply pressure < 1.0 bar)

− Dwell time (supply pressure > 7.0 bar)

Diagnostics > Monitoring > Actuator

− Supply pressure status:

− Supply pressure (Code 48 - d7)

, , ,

32 EB 8389-1S EN

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Valve signature

4.4 Valve signature, friction(x)

The positioner calculates the friction during closed-loop operation and compares it with the friction determined when the reference graph was plotted.

Data are recorded automatically 15 minutes after initialization (regardless of the operating mode selected) if a reference graph has already been plotted. Data logging does not need to be activated.

Dening parameters

1. Record the reference graph. See u Section 4.1.

2. Select classication for status messages. See uSection 4.2.1.

2.Device settings > Alarm settings > Status

classication > Valve

Change in friction

− Higher in total range: [

− Lower in total range: [ ], , ,

− Higher in mid-position: [ ], , ,

− Lower in mid-position: [ ], , ,

− Higher near max. OPEN position: [ ], , ,

− Lower near max. OPEN position: [ ], , ,

− Higher near CLOSED position: [ ], , ,

− Lower near CLOSED position: [ ], , ,

], , ,

Fig. 5: Diagnostics > Monitoring/tests > Valve signature > Valve signature, friction(x)

EB 8389-1S EN 33

Page 34

Valve signature



4.4.1 Analysis and monitoring

The positioner generates the 'Change in friction' message with the selected status classi-

cation. The friction for the total range of the valve, the mid valve position and for the ranges near to the end positions are compared.

The positioner calculates the friction during closed-loop operation from the actuator lling and venting graphs at the point where a directional change in valve travel takes place. The positioner converts the friction data into xed points close to the point of directional change and compares them to the reference friction.

If the friction at a xed point increases to

more than double of the reference friction, the friction is regarded to be higher.

If the friction at a xed point drops to less

than half of the reference friction, the friction is regarded to be lower.

Note:

To ensure that sufcient data points

are available for calculating the friction, the valve must not be moved too quickly.

4.5 Resetting single status messages

All messages generated by the valve signature can be reset together by selecting and

executing "Reset 'Pressure sensor monitoring

values". These messages include:

− Change in friction

− Supply pressure status

− Defective actuator springs

− Zero

At the same time, the supply pressure data (supply pressure, min. supply pressure and max. supply pressure) are reset as well.

Diagnostics > Service/maintenance > Reset

− Reset 'Pressure sensor monitoring values'

Diagnostics > Monitoring > Valve

− Change in friction:

34 EB 8389-1S EN

, , ,

Page 35

Page 36

Valve signature

On/off valve

START-UP

Prerequisite:

– Type of application: On/off valve

Operating point, Limit fail-safe position, Limit operating point

Travel time assessment limit

Valve end position limit

Status classication (NE 107)

Breakaway time increasing/decreasing

Transit time increasing/decreasing

Final travel/angle value not reached

Final travel/angle value increasing/

easing

decr

â â

On/off diagnosis Discrete set point analysis PST

Dene parameters for partial stroke

test, see u Section 12

First analysis after dening parameters =

Breakaway time, transit

time, valve end position (increasing/decreasing)

logged by operating hours counter

PROCESS

Reset measured 'On/off valve' values

Reset all 'On/off valve' parameters

Reference

â â

Analysis (NE 107)/

On/off valve status

Analysis, see

u Section 12.3

36 EB 8389-1S EN

Page 37

On/off valve

Operating point limit

Fail-safe action limit

x [%]

Operating point limit

Fail-safe action limit

x [%]

Lower range value (PST) Upper range value (PST)

x [%]

5 On/off valve

The travel range of open/close (on/off) is dened by the fail-safe position and the operating point. As a result, the following parameters to determine the working range and set point range are not analyzed and cannot be changed.

− Lower travel/angle range value

− Upper travel/angle range value

− Lower travel/angle limit

− Upper limit for travel/angle

− Lower set point range value

− Upper set point range value

The discrete analysis of the reference variable is performed in automatic mode.

If the set point ( ) is below 'Operating point limit' when the automatic mode starts, the valve (

the set point increases and exceeds 'Operating point limit', the valve moves to the 'Operating point'. The valve moves back to the fail-safe position (0% in the example) if the set point then falls below 'Fail-safe action limit'.

) moves to the fail-safe position.

w [%]

Operating point

If the set point ( ) is above 'Operating point limit' when the automatic mode starts, the valve (

) moves to the operating

point. The valve moves back to the fail-safe

position (0% in the example) if the set point then falls below 'Fail-safe action limit'.

w [%]

Operating point

Fail-safe position

t <6s

t [s]

Starting the partial stroke test (PST)

A partial stroke test is started when the set point ( ) moves in the range between 25

and 50% of the travel range and remains

there for longer than six seconds. See

uSection 12.1.

w [%]

Operating point =

Operating point limit

Stop PSTStart PST

>6s

t [s]

Fail-safe position

∆t > 6 s

Fail-safe action limit

Fail-safe position

t [s]

EB 8389-1S EN 37

Page 38

On/off valve



The PST diagnostic parameter 'Lower range value' must be within the dened position ± 'Tolerance limit' for the partial stroke test to start.

After the partial stroke test is completed, the valve moves back to its last position (fail-safe position or operating point).

Canceling the partial stroke test (PST)

The partial stroke test is canceled whenever the set point (

'Fail-safe action limit' and 'Operating point limit', falling below 'Operating point limit'.

After the partial stroke test is canceled, the valve moves back to its last position (fail-safe position or operating point).

Dening parameters

Note:

The parameters can only be dened in TROVIS-VIEW4 after the 'Type of ap-

plication' has been set to 'On/off valve'.

1. Select the type of application.

2. Dene parameters for on/off valve.

3. Dene parameters for partial stroke test (PST). See u Section 12.

Start-up

− Type of application (Code 49 - h0): On/off

valve

2.Device settings > Positioner > Transfer

characteristic on/off

− Operating point (Code 49 - h1): 0.0 to

100%, [100 %]

) leaves the range between

− Fail-safe action limit (Code 49 - h2): 0.0 to

20.0 %, [12.5 %]

− Operating point limit (Code 49 - h5):

55.0 to 100.0 %, [75.0 %]

3.Diagnostics > Monitoring/tests > Dynamic

tests > Partial stroke test (PST)

See u Section 12

5.1 Diagnostics for on/off valve

The diagnostics for on/off valve provide statements on the valve end positions, transit times (increasing/decreasing) and breakaway times (increasing/decreasing).

The data are recorded automatically for the diagnostics for on/off valve in automatic mode. Data logging does not need to be activated.

The positioner compares the current breakaway time, transit time and valve position with the values recorded during the reference

measurement (rst analysis) while the plant is

running.

Dening parameters

Note:

The parameters can only be dened in TROVIS-VIEW4 after the 'Type of ap-

plication' has been set to 'On/off valve'.

1. Enter limits for monitoring. See u

5.2.

2. Select classication for status messages.

Section

38 EB 8389-1S EN

Page 39

On/off valve

(decreasing)

(increasing)

x [%]

t [s]

Device settings > Alarm settings

− Travel time assessment limit (Code 49 - h7): [0.6] to 30.0 s

− Valve end position limit (Code 49 - h8): [0.3] to 100.0 %

2.Device settings > Alarm settings > Status

classication > On/off valve

− Increasing breakaway time: [

− Decreasing breakaway time: [ ], , ,

− Transit time increasing: [ ], , ,

− Transit time (decreasing): [ ], , ,

− Final travel/angle value not reached: [ ], , ,

− Increasing nal travel/angle value: [ ], , ,

− Decreasing nal travel/angle value: [ ], , ,

5.2 Analysis and monitoring

The analysis pinpoints to a fault when at least one of the following conditions is met while the valve is moving:

− The current 'Increasing breakaway time' differs from the reference value by the

amount entered in 'Travel time assessment limit'.

− The current 'Decreasing breakaway time' differs from the reference value by the

amount entered in 'Travel time assessment limit'.

− The current 'Transit time increasing' dif- fers from the reference value by the

amount entered in 'Travel time assessment limit'.

], , ,

− The current 'Transit time (decreasing)' dif- fers from the reference value by the

amount entered in 'Travel time assessment limit'.

− The current 'Transit time increasing' dif- fers from the reference value by the

amount entered in 'Valve end position limit'.

− The current 'Transit time (decreasing)' dif- fers from the reference value by the

amount entered in 'Valve end position limit'.

− The valve end position is not reached.

w [%]

Valve end position

(increasing)

Valve end position

(decreasing)

Breakaway time

(decreasing)

Transit time

Breakaway time

(increasing)

Transit time

Fig. 6: Analysis of diagnostics for on/off valve

If one of these conditions is met, the position-

er generates an 'On/off valve status' message according the selected status classica-

tion.

Diagnostics > Monitoring

− On/off valve status (Code 85):

, , ,

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Page 40

On/off valve

5.3 Resetting single status messages

The message and the limit values are reset by selecting and executing "Reset measured 'On/off valve' values".

The positioner saves the reference analysis and two further test analyses. The analysis of the oldest test is deleted when another test is performed.

Diagnostics > Service/maintenance > Reset

− Reset measured 'On/off valve' values

40 EB 8389-1S EN

Page 41

Valve position x histogram

6 Valve position x histogram

The valve position histogram is a statistical analysis of the plotted valve positions. The histogram provides information about where the valve mainly spends the majority of its time during its service life and whether it shows a recent trend concerning changes in its operating range.

Data are recorded automatically 15 minutes after initialization (regardless of the operating mode selected). Data logging does not need to be activated.

The positioner records the valve position every second and assigns the data into predened valve position classes. The distribution showing how often the sound level occurred within a valve position class is shown in a bar graph.

− 'Mean value': Average class assignment

of valve positions throughout 'Monitoring duration'.

− 'Number of measurement points': Total number of values recorded during the

'Monitoring duration'.

− 'Monitoring duration'

The measured data are saved every 24 hours in the positioner.

Short-term monitoring

In order to be able to recognize any shortterm changes in valve position, the positioner records the valve positions according to

the adjusted 'Sampling time' and analyses

the last 100 measured values.

− 'Mean time': Contains the average class assignment of valve positions for the last 100 measured values.

− 'Adjusted monitoring duration': 100 x

'Sampling time'

The positioner saves the valve positions in a circular buffer, which holds 100 measured values at one time.

Fig. 7: Diagnostics > Monitoring/tests > Histograms > Valve position x histogram

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Page 42

Valve position x histogram



Note:

Changing 'Sampling time' causes all

existing measured values to be deleted from the circular buffer.

Dening parameters

1. Set the 'Sampling time' for the short-term monitoring.

2. Select classication for status messages. See u Section 6.1.

Diagnostics > Monitoring/tests > Histograms > Valve position x histogram > Short-term monitoring

− Sampling time: Adjustable as required, [00:14:24 d.h:min:s]

2.Device settings > Alarm settings > Status

classication > Valve position

Manipulated variable range

− Mainly near CLOSED position:

], , ,

[

− Mainly near max. OPEN position: [ ], , ,

− Mainly in CLOSED position: [ ], , ,

− Mainly near max. OPEN position: [ ], , ,

Change in manipulated variable range:

− Operating range shifted to CLOSED position: [ ], , ,

− Operating range shifted to max. OPEN position: [ ], , ,

− Short-term change: [ ], , ,

6.1 Analysis and monitoring

Analysis of the histogram for control valves starts one hour after the monitoring period begins. No analysis is performed for on/off valves.

If the control valve mainly works during the monitoring duration near or in one of the end positions, the positioner generates the

'Manipulated variable range' message with the selected status classication.

For analysis of the short-term monitoring, a complete set of data (100 measured values) is required. The analysis is only active when the sampling time setting is greater or equal to one minute.

The positioner generates the 'Change in manipulated variable range' message with the selected status classication whenever a

trend showing a change in the operating range is found from the analysis of the histogram and the short-term monitoring.

Diagnostics > Monitoring > Valve position

− Manipulated variable range:

− Change in manipulated variable range: , , ,

, , ,

6.2 Resetting single status messages

The 'Manipulated variable range' and the 'Change in manipulated variable range'

messages can be reset by selecting and executing the command "Reset 'Reset valve position x histogram". This command resets all diagnostic parameters and measured data

42 EB 8389-1S EN

Page 43

of the histogram and the short-term monitoring.

By selecting and executing the command "Reset 'Short-term valve position x histo-

gram", the diagnostic parameters and measured data in the Short-term monitoring folder are reset.

Diagnostics > Service/maintenance > Reset

− Reset 'Valve position x histogram'

− Reset 'Short-term valve position x histogram'

Valve position x histogram

EB 8389-1S EN 43

Page 44

Set point deviation e histogram

7 Set point deviation e histo-

gram

The set point deviation histogram contains a statistical analysis of any set point deviations recorded. It provides information on to which extent a set point deviation has occurred during the valve service life and whether faults may occur due to a restricted operating range or due to seat leakage.

Data are recorded automatically 15 minutes after initialization (regardless of the operating mode selected). Data logging does not need to be activated.

The positioner records the set point deviation every second and assigns the data into pre-

dened classes. The distribution showing

how often the set point deviation remained within a class is shown in a bar graph.

− 'Mean value': Average class assignment

of set point deviation throughout 'Monitoring duration'.

− 'Number of measurement points': Total number of values recorded during the

'Monitoring duration'.

− 'Monitoring duration'

The measured data are saved every 24 hours in the positioner.

Short-term monitoring

In order to be able to recognize any shortterm changes in set point deviation, the positioner records the set point deviation accord-

ing to the adjusted 'Sampling time' and

analyses the last 100 measured values.

− 'Mean time': Contains the average class assignment of set point deviations for the last 100 measured values.

− 'Adjusted monitoring duration': 100 x

'Sampling time'

The positioner saves the set point deviations in a circular buffer, which holds 100 measured values at one time.

Fig. 8: Diagnostics > Monitoring/tests > Histograms > Set point deviation e histogram

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Set point deviation e histogram



Note:

Changing 'Sampling time' causes all

existing measured values to be deleted from the circular buffer.

Dening parameters

1. Set the 'Sampling time' for the short-term monitoring.

2. Select classication for status messages. See u Section 7.1.

Diagnostics > Monitoring/tests > Histograms > Set point deviation e histogram > Shortterm monitoring

− Sampling time: Adjustable as required, [00:14:24 d.h:min:s]

2.Device settings > Alarm settings > Status

classication > Valve

Seat leakage

− May exist: [

Device settings > Alarm settings > Status classication > Valve position

Manipulated variable range limitation

− Lower: [

− Upper: [ ], , ,

− No change possible: [ ], , ,

Positioner-valve linkage

− Travel transmission not optimal: [ ], , ,

], , ,

7.1 Analysis and monitoring

Ideally, the set point deviation should be

nearly 0%. Set point deviations greater than 1% follow-

ing in quick succession pinpoint to a limitation of the upper operating range. In this

case, the positioner generates the 'Manipulated variable range limitation' and 'Positioner-valve linkage' messages with the selected status classications.

Set point deviations smaller than 1% follow-

ing in quick succession pinpoint to a limitation of the lower operating range or to seat

leakage. The positioner generates the 'Manipulated variable range limitation', 'Positioner-valve linkage' and 'Seat leakage' messages with the selected status classica-

tions. If almost all set point deviations during the

short-term monitoring are greater than 1% or smaller than –1%, this may indicated that

the actuator or valve stem is jammed. The

positioner generates the 'Manipulated variable range limitation' and 'Positioner-valve linkage' messages with the selected status classications.

Diagnostics > Monitoring > Valve

− Seat leakage:

Diagnostics > Monitoring > Valve position

− Manipulated variable range limitation: , ,

− Positioner-valve linkage: , , ,

, , ,

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Set point deviation e histogram

7.2 Resetting single status messages

The 'Seat leakage', 'Manipulated variable range limitation' and 'Positioner-valve linkage' messages can be reset by selecting and executing the command "Reset 'Set point deviation e histogram" or "Reset 'Short-term set

point deviation e histogram".

By selecting and executing the "Reset 'Set

point deviation e histogram" command, all diagnostic parameters and measured data of the histogram and the short-term monitoring are reset.

By selecting and executing the command "Reset 'Short-term set point deviation e histo-

gram", the diagnostic parameters and measured data in the Short-term monitoring folder are reset.

Diagnostics > Service/maintenance > Reset

− Reset 'Set point deviation histogram e'

− Reset 'Short-term set point deviation e histo-

gram'

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Page 48

Set point deviation e histogram

t [s]

x [%]

t [s]

x [%]

Cycle counter histogram

Stem seal

â â â â

Self-adjusting Adjustable Other, -/- Bellows seal

Max. cycle count

START-UP

PROCESS

â â â

â â

Status classication (NE 107)

External leakage possibly to be

expected soon

â â

Determining the cycle spans

â â

Dynamic stress factor Dynamic stress factor

Dynamic stress factor > 90 %

â â

Analysis (NE 107)/

logged by operating hours counter

acking leakage

Status classication (NE 107)

External leakage possibly to be

expected soon

Determining the cycle height

Dynamic stress factor > 90 %

Analysis (NE 107)/

logged by operating hours counter

Packing leakage

Reset 'Cycle counter histogram'

48 EB 8389-1S EN

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Cycle counter histogram

8 Cycle counter histogram

The cycle counter histogram provides a statistical analysis of the cycles. As a result, the cycle c

ounter also provides information on the dynamic stress of a bellows seal and/or packing.

Data are recorded automatically 15 minutes after initialization (regardless of the operating mode selected). Data logging does not need to be activated.

The positioner records the number of cycle spans when the stem seal setting is set to

'Live-loaded', 'Adjustable', 'Other' or '-/-'.

A valve cycle span starts at the point where the valve stroke changes direction until the point where it changes direction again. The valve stroke between these two changes in direction is the cycle span.

The positioner records the cycle height when

the 'Stem seal’ setting is set to 'Bellows seal'.

The cycle height is the travel performed between two changes in direction.

The cycle spans or cycle heights are assigned to classes. The distribution showing how often the cycle span or height occurred within a class is shown in a bar graph.

− 'Mean value': Average class assignment

of cycle height calculated from the 'No. of cycles'

− 'No. of cycles'

The measured data are saved every 24 hours in the positioner.

Dening parameters

1. Select the type of stem seal.

(*When 'Other' is selected as the stem seal, the additional parameter 'Max. cycle count' must also be set).

Device settings > Alarm settings

− Stem seal: [-/-], Live-loaded, Adjustable,

Bellows seal, Other

* − Max. cycle count:

1 to 1000000000, [1000000]

Fig. 9: Diagnostics > Monitoring/tests > Histograms > Cycle counter histogram

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Cycle counter histogram

Short-term monitoring

To recognize short-term changes in the cycle spans or cycle height, the positioner analyzes the last 100 cycle heights or cycle spans.

The positioner saves the cycle heights or cycle spans in a circular buffer, which holds 100 measured values at one time.

− 'Mean time': Contains the average class assignment for the last 100 measured values.

Dening parameters

1. Select classication for status messages.

1.Device settings > Alarm settings > Status

classication > Valve

Packing leakage

− Possibly to be expected soon: [ ,

], ,

8.1 Analysis and monitoring

The load on the bellows and/or packing can be read from the 'Dynamic stress factor' parameter. The value is determined from the cycle spans or cycle heights and takes into account the type of packing used in the valve.

A 'Packing leakage' message is generated with the selected status classication whenev-

er:

− The number of measured cycle spans ex- ceeds 450000 when 'Live-loaded' is selected as the stem seal.

− The number of measured cycle spans ex- ceeds 180000 when 'Adjustable' is selected as the stem seal.

− The number of measured cycle spans ex-

ceeds 90% of the 'Max. cycle count' when 'Other' is selected as the stem seal.

− The number of measured cycle heights

exceeds 180000 when 'Bellows seal' is

selected as the stem seal.

Measured process values

− Dynamic stress factor

Diagnostics > Monitoring > Valve

− Packing leakage:

, , ,

8.2 Resetting single status messages

The 'Packing leakage' message is reset by

selecting and executing the command "Reset

'Cycle counter histogram" or "Reset 'Short-

term cycle counter histogram".

By selecting and executing the "Reset 'Cycle

counter histogram" command, all measured data of the histogram and the short-term

monitoring as well as the 'Dynamic stress factor' are reset.

By selecting and executing the command "Reset 'Short-term cycle counter histogram",

the measured data in the Short-term monitoring folder are reset.

Diagnostics > Service/maintenance > Reset

− Reset 'Cycle counter histogram'

− Reset 'Short-term cycle counter histogram'

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Cycle counter histogram

x [%]

t [s]

Leakage sensor

Requirements

– Positioner accessories identication: Leakage sensor – Activate CLOSED end position: On

START-UP

Manufacturer reference

with specied standard conditions

Level (x) diagram

Phase 3

â â

Reset 'Leakage sensor

manufacturer reference'

Settling time before sound level

measurement

Set points, sensitivity sound level

Start

ß Not successful

Phase 2

Alarm settings

Response time, preset alarm limits

Status classication (NE 107)

Alarm limit 2

exceeded

Process reference

with process conditions

User-dened

Sensitivity sound

level lower

Cancel

â á

ß Successful

Successful

Phase 1

Reset 'Leakage sensor process

reference'

â â

Alarm limits 1,

2, 3

Recommended:

10 dB, 15 dB, 25 dB

Alarm limit 3

exceeded

Determining the mean sound levels while the valve is tightly shut

Cyclic analysis of sensor level, e.g. over dynamic HART® variables

PROCESS

Mean sound level exceeds

alarm limit 2

â â

Mean sound level exceeds alarm limit 3

Analysis (NE 107)/logged by operating hours counter

Seat leakage

Reset 'Leakage sensor process reference'

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Leakage sensor

9 Leakage sensor

By upgrading the positioner with a leakage

sensor, it is possible to detect seat leakage when the valve is in the closed position. To achieve this, the leakage sensor measures

the sound pressure level (dB) while the valve

is tightly shut and compares the current

sound pressure level with predened alarm

limits. The positioner generates a message if the current sound pressure level exceeds one of the alarm limits.

Requirements for using the seat leakage sensor:

1. A leakage sensor is mounted to the valve. Refer to the standard mounting and operating instructions of the positioner uEB8384-6 EN

Alarm limit 3

2. The leakage sensor option has been selected.

3. The tight-closing function has been activated.

4. The leakage sensor has been put into operation. See u Section 9.1.

2.Start-up > Reference graphs > Leakage

sensor

− Positioner accessories identication:

Leakage sensor

Device settings > Positioner > Transfer characteristic or Transfer characteristic on/ off

− Activate CLOSED end position (Code 14):

− CLOSED end position (Code 14):

0.0 to 49.9 %, [1.0 %]

Alarm limit 2

Fig. 10: Start-up > Reference graphs > Leakage sensor > Manufacturer reference

Alarm limit 1

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Leakage sensor

9.1 Start-up of the leakage sensor

To be able to use the full scope of functions, the response of the leakage sensor to standardized conditions and to the prevailing process conditions must be measured. Furthermore, the limit to activate the alarm must be entered.

9.1.1 Manufacturer reference

The manufacturer reference (u Fig. 10) measures the response of the leakage sensor. We recommend performing the manufacturer reference test. On request, it can also be

performed by SAMSON and must not be

performed again. In this case, the standard conditions are:

• Medium = air

• Input pressure = 4 bar

• Output pressure = atmosphere

Default values of alarm limits are A2 = 15

dB and A3 = 25 dB. If the leakage sensor has been tted later onto the valve, the alarm limits must be manually congured or adjusted by performing a manufacturer or process reference test before the leakage sensor can be used. See u Section 9.1.2.

While the manufacturer reference test is running, the parameters listed below are automatically deactivated:

− Activate CLOSED end position

− Activate ramp function

Phase 1: The valve moves to eleven dened

set points one after the other. After reaching

a set point and after the 'Settling time before sound level measurement' has elapsed, the

leakage sensor measures the sound pressure level.

If the difference between two neighboring set

points is larger or equal to the adjusted 'Sensitivity sound level', the valve does not move

to the next set points. Instead, Phase 2 starts.

Phase 1 successful: The sound pressure level

exceeded the adjusted 'Sensitivity sound level' (10dB) between set points 4 and 5. Phase 2

starts.

If the 'Sensitivity sound level' is not reached

after the valve has moved to all eleven set points, the test is canceled. The canceled test

is logged with a time stamp. The 'Test information' reading indicates 'Test failed: sound level change too small'.

Phase 1 not successful: The difference in sound pressure level between two neighboring set points

is smaller than the 'Sensitivity sound level' (10dB). The reference test is canceled.

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Phase 2: A 0.30 % band is placed around



the last set point that the valve moved to. One third of this band lies in front of the set point that the valve moved to and two thirds of the band lies behind it. The band itself is

subdivided into eleven xed points. Each xed point is located at a distance of 0.03%

to the next point. The valve moves to the new

xed points one after the other. After reaching a xed point and after the 'Settling time before sound level measurement' has

elapsed, the leakage sensor measures the sound pressure level. The manufacturer reference test is successful

when the difference between the rst and last newly dened points is larger or equal to the adjusted 'Sensitivity sound level'.

Leakage sensor

Phase 2 not successful: The difference in sound

pressure level between the rst and last newly dened points is lower than 'Sensitivity sound level' (10 dB). Phase 3 starts.

Phase 3: The valve moves to the set points valid for phase 1 one after the other. This is plotted in a sound level vs. travel graph. The graph shows where the point of activation is

and to which value the 'Sensitivity sound level' must be reduced to allow the test to be

completed successfully.

Dening parameters

Note:

The parameters can only be dened in TROVIS-VIEW4 after the 'Positioner

Phase 2 successful: The 'Sensitivity sound level' (10 dB) is reached between the rst and last newly dened points. The manufacturer test is

successfully completed.

If the 'Sensitivity sound level' is not reached

after the valve has moved to all eleven newly

dened points, then the change in sound

pressure level is too low. In this case, phase 3 starts.

EB 8389-1S EN 55

accessories identication' has been set

to 'Leakage sensor'.

1. Switch to manual mode.

2. Dene the parameters for the manufacturer reference test. Refer to Note con- cerning editing set points.

3. Start manufacturer reference test. The start of the reference test is documented in the Time stamp. 'D8' and 'TEST' are indicated in alternating sequence on the positioner display.

Page 56

Leakage sensor



Start-up

− Enter operating mode (Code 0): Manual

2.Start-up > Reference graphs > Leakage

sensor > Manufacturer reference

− Settling time before sound level measure- ment: 1 to 255 s, [5 s]

− Sensitivity sound level: 3 to 255 dB, [10 dB]

− Edit set points: 0.00 to 100.00 % [1: 0.00 %; 2: 0.10 %; 3: 0.20 %; 4: 0.30%; 5: 0.40 %; 6: 0.50 %; 7: 0.60 %; 8: 0.70 %; 9: 0.80 %; 10: 0.90 %,

11: 1.00%]

3. − Start manufacturer reference

Note:

By selecting and executing 'Cancel manufacturer reference' or by pressing the rotary pushbutton, the manufacturer reference test is canceled (Test information = 'Test canceled manually'). After canceling the manufacturer reference test, the positioner remains in the manual mode.

In TROVIS-VIEW4 the test information and progress ag of the manufacturer reference

test are displayed. When the manufacturer reference test has been successfully completed, the Test information reading indicates

'Test completed successfully'.

Note concerning editing set points

− The entered set points must continuously

increase from 'Set point 1' to 'Set point 11'.

− The valve moves to the set points in steps

of 0.1%. Set points must be rounded up

to two decimal places.

− User-dened settings can be saved for other functions (e.g. process reference

test) in a le.

9.1.1.1 Assessment

While the manufacturer reference test is running, the positioner determines three alarm limits. The relation between Valve

position x [%] and Sound level [dB] is shown

in TROVIS-VIEW 4:

− Relation 1: Valve position and sound lev-

el at 0% position

− Relation 2: Valve position and sound lev- el at the point where the curve in the

'Leakage sensor manufacturer reference'

graph starts to rise monotonously

− Relation 3: Valve position and sound lev- el at the last measurement

9.1.1.2 Resetting single status messages

The short-term monitoring (parameters, measured data and analysis) can be reset by selecting and executing the command "Reset

'leakage sensor manufacturer reference".

If the test is restarted and a test analysis has already been performed, the analysis of the old manufacturer reference test is overwritten.

Diagnostics > Service/maintenance > Reset

− Reset 'Leakage sensor manufacturer reference'

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Leakage sensor

9.1.2 Process reference

The process reference test (Fig. 11) measures the response of the leakage sensor to process conditions. Process medium, inlet and outlet pressures as well as the process envi-

ronment can have an effect on the sensor's

response. The alarm limits are determined from the measured data.

The process reference test is performed and analyzed in the same manner as the manufacturer reference test described in u Section

9.1.1. This test must be performed after the valve has been installed and the plant has been commissioned.

If it is not possible to perform the process ref-

erence test, the user-dened alarm limits can

be entered. See u Section 9.1.2.2.

Alarm limit 3

While the process reference test is running, the parameters listed below are automatically deactivated:

− Activate CLOSED end position

− Activate ramp function

Phase 1: The valve moves to eleven dened

set points one after the other. After reaching

a set point and after the 'Settling time before sound level measurement' has elapsed, the

leakage sensor measures the sound pressure level.

If the difference between two neighboring set

points is larger or equal to the adjusted 'Sensitivity sound level', the valve does not move

to the next set points. Instead, Phase 2 starts.

Alarm limit 2

Alarm limit 1

Fig. 11: Start-up > Reference graphs > Leakage sensor > Process reference

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Leakage sensor

Phase 1 successful: The sound pressure level

exceeded the adjusted 'Sensitivity sound level' (10 dB) between set points 4 and 5. Phase 2

starts.

xed points one after the other. After reaching a xed point and after the 'Settling time before sound level measurement' has

elapsed, the leakage sensor measures the sound pressure level.

If the 'Sensitivity sound level' is not reached

after the valve has moved to all eleven set points, the test is canceled. The canceled test

is logged with a time stamp and the 'Test information' reading indicates 'Test failed: sound level change too small'.

Phase 1 not successful: The difference in sound pressure level between two neighboring set points

is smaller than the 'Sensitivity sound level' (10dB). The process reference test is canceled.

Phase 2: A 0.30 % band is placed around the last set point that the valve moved to. One third of this band lies in front of the set point that the valve moved to and two thirds of the band lies behind it. The band itself is

subdivided into eleven xed points. Each xed point is located at a distance of 0.03%

to the next point. The valve moves to the new

Phase 2 successful: The 'Sensitivity sound level' (10 dB) is reached between the rst and last newly dened points. The process reference test is

successfully completed.

The process reference test is successful when

the difference between the rst and last newly dened points is larger or equal to the adjusted 'Sensitivity sound level'.

If the 'Sensitivity sound level' is not reached

after the valve has moved to all eleven newly

dened points, then the change in sound

pressure level is too low. In this case, phase 3 starts.

Phase 2 not successful: The difference in sound

pressure level between the rst and last newly dened points is lower than 'Sensitivity sound level' (10 dB). Phase 3 starts.

58 EB 8389-1S EN

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Leakage sensor



Phase 3: The valve moves to the set points valid for phase 1 one after the other. This is plotted in a sound level vs. travel graph. The graph shows where the point of activation is

and to which value the 'Sensitivity sound level' must be reduced to allow the test to be

completed successfully.

Dening parameters

Note:

The parameters can only be dened in TROVIS-VIEW4 after the 'Positioner accessories identication' has been set

to 'Leakage sensor'.

1. Switch to manual mode (Code0 = MAN).

2. Dene the parameters for the process reference test. Refer to Note concerning editing set points.

3. Start process reference test. The start of the reference test is documented in the Time stamp. 'D9' and 'TEST' are indicated in alternating sequence on the positioner display.

Start-up

− Enter operating mode (Code 0): Manual

2.Start-up > Reference graphs > Leakage

sensor > Process reference

− Settling time before sound level measure- ment: 1 to 255 s, [5 s]

− Sensitivity sound level: 3 to 255 dB, [10 dB]

− Edit set points: 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 process reference

Note:

By selecting and executing 'Cancel reference reference' or by pressing the rotary pushbutton, the process reference test is canceled (Test information = 'Test canceled manually'). After the test has been canceled, the positioner remains in manual mode.

In TROVIS-VIEW4 the test information and progress ag of the test are displayed. When

the process reference test has been successfully completed, the Test information reading

indicates 'Test completed successfully'.

Note concerning editing set points

− The entered set points must continuously

increase from 'Set point 1' to 'Set point 11'.

− The valve moves to the set points in steps

of 0.1%. Set points must be rounded up

to two decimal places.

− User-dened settings can be saved for other functions (e.g. another process ref-

erence test) in a le.

9.1.2.1 Assessment

While the process reference test is running, the positioner determines three alarm limits. The relation between Valve position x [%]

and Sound level [dB] is shown in TROVISVIEW4:

− Relation 1: Valve position and sound lev-

el at 0% position

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Leakage sensor

[%]

t [s]

− Relation 2: Valve position and sound lev- el at the point where the curve in the

'Leakage detection process reference'

graph starts to rise monotonously

− Relation 3: Valve position and sound lev- el at the last measurement

9.1.2.2 Alarm settings

After connecting the leakage sensor and performing the manufacturer and process reference tests, the positioner is able to pinpoint any seat leakage. To do this, it records the sound level in closed-loop operation while the valve is tightly shut. The seat leakage monitoring is performed automatically while the process is running.

The alarm limits detected in the manufacturer reference test, process reference test or user-

dened settings can be selected. When userdened limits are entered, the alarm limits

must rise continuously from 'Alarm limit 1' to 'Alarm limit 3'.

During closed-loop operation, the mean sound levels while the valve is tightly shut are compared to the alarm limits. Which mean sound level is to be used for comparison can

be selected in 'Response time':

− Very quick: The mean value calculated from the current sound level and from the last four sound levels measured while the valve is tightly shut is used for monitoring (Fig. 12: Tight-closing event 31 and sound level E to I).

− Quick: The mean value calculated from all sound levels measured while the valve is tightly shut is used for monitoring (Fig. 12: Tight-closing event 31 and sound level A to I).

4 … 29

[dB]

031

t [s]

Fig. 12:

Tight-closing process and calculated mean values for analysis of the process reference test

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Leakage sensor

− Slow: The mean value calculated from the last 30 sound levels measured during short-term monitoring (see uSection 9.2) is used for monitoring (Fig. 12: Tightclosing event 2 to Tight-closing event 31 with all sound levels).

− Very slow: The mean value calculated from all the sound levels measured during long-term monitoring (see u Section

9.3) is used for monitoring (Fig. 12: Tight-closing event 1 to Tight-closing event 31 with all sound levels).

The 'No alarm triggering' setting deactivates

the alarm function.

Dening parameters

1. Dene alarm parameters.

2. Select classication for status messages. See u Section 9.1.2.3.

1.Start-up > Reference graphs > Leakage

sensor > Process reference

− Response time: [No alarm triggering], Very quick, Quick, Slow, Very slow

− Preset alarm limits

reference], Process reference, User-dened

2.Device settings > Alarm settings > Status

classication > Valve

− Alarm limit 2 exceeded:

], , ,

[

− Alarm limit 3 exceeded: [ ], , ,

On selecting the alarm limit 'User-dened', we

recommend checking the correct setting of the alarm limits using an operating time of one to three months based on the measured data in

'Sound level monitoring' diagram (see

u Section 9.4).

: [Manufacturer

9.1.2.3 Monitoring

If the determined mean sound level exceeds

the 'Alarm limit 2', the positioner generates a 'Seat leakage' message with status classication selected for 'Alarm limit 2 exceeded'.

If the determined mean sound level exceeds

the 'Alarm limit 3', the positioner generates a 'Seat leakage' message with status classication selected for 'Alarm limit 3 exceeded'.

Diagnostics > Monitoring > Valve

− Seat leakage:

, , ,

9.1.2.4 Reset

The process reference test (diagnostic parameters, measured data and analysis) and the 'Seat leakage' message can be reset by selecting and executing the command "Reset

'leakage sensor process reference".

If the test is restarted and a test analysis has already been performed, the analysis of the old process reference test is overwritten.

Diagnostics > Service/maintenance > Reset

− Reset 'Leakage sensor process reference'

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Leakage sensor

9.2 Short-term monitoring

Short-term monitoring provides an insight into short-term changes in the sound level while the valve is tightly shut.

Data are recorded in the background regardless of the operating mode selected. Data logging does not need to be activated.

The leakage sensor records the sound level when the valve leaves the tightly shut position or whenever the sound level changes by

2 dB. A mean value is calculated from the

recorded sound level and last four recorded sound levels. If this value deviates from the previous mean

value by 'Sensitivity sound level', the new

mean value is saved in the short-term monitoring.

The last 'Mean value' recorded in the short-

term monitoring is indicated. The positioner saves the mean values of the

sound level and valve travel in a circular buffer, which holds 30 measured values at one time together with a time stamp. The saved values can be read in the Measured data

assessment folder.

Dening parameters

1. Enter the sensitivity sound level.

1.Diagnostics > Monitoring/tests > Leakage

sensor > Short-term monitoring

− Sensitivity sound level: 3 to 255 dB, [3 dB]

Fig. 13: Start-up > Reference graphs > Leakage sensor > Short-term monitoring

62 EB 8389-1S EN

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Leakage sensor

9.2.3 Resetting single status messages

The short-term monitoring (diagnostic parameters, measured data and analysis) can be reset by selecting and executing the command

eset 'Short-term leakage sensor monitor-

ing". The data in the Measured data assessment folder are reset as well.

Diagnostics > Service/maintenance > Reset

− Reset 'Short-term leakage sensor monitoring'

9.3 Long-term monitoring

To obtain a sound level trend over a long period of time, the long-term monitoring contains all the mean values saved in the shortterm monitoring since the last reset:

− 'Mean value': The average sound level

calculated from 'No. of measuring points'

− 'No. of measuring points'

Data are recorded in the background regardless of the operating mode selected. Data logging does not need to be activated.

9.3.1 Resetting single status messages

The measured data of the long-term monitoring are reset by selecting and executing the

command "Reset 'Leakage detection - Long-

term monitoring".

Diagnostics > Service/maintenance > Reset

− Reset 'Leakage sensor - Long-term monitoring'

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Leakage sensor

9.4 Sound level(x)

The sound level monitoring is shown in a histogram. The distribution of recorded sound

levels within xed classes of valve position x

is revealed. The leakage sensor records the sound level

every second and assigns the data into predened valve positions classes. The distribution showing how often the sound level occurred within a valve position class is shown in a bar graph.

Data are recorded in the background regardless of the operating mode selected. Data logging does not need to be activated.

9.4.2 Resetting single status messages

The measured data of the sound level monitoring are reset by selecting and executing

the command "Reset 'Leakage sensor sound

level(x)".

Diagnostics > Service/maintenance > Reset

− Reset 'Leakage sensor sound level(x)'

Fig. 14: Start-up > Reference graphs > Leakage sensor > Level(x)

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Page 66

Leakage sensor

x [%]

t [s]

Course of end position

Prerequisite

– Activate CLOSED end position: On

START-UP

PROCESS

irst zero point =

Reference

Zero calibration

Recording threshold

Alarm settings (NE 107)

Course of end position

Valve signature complete?

u Section 4.1

ß NO

YES

Zero shifted monotonically increasing/decreasing, alternating

Subsequent zero calibration over

Code 6 - ZP

Status classication (NE 107)/logged by operating hours counter

Course of end position

â â

Reset 'Reference values for course of

lower end position'

66 EB 8389-1S EN

Reset 'Course of lower end position'

Page 67

Course of end position

10 Course of end position

The course of end position is used to detect an alternating zero point or a creeping zero point shift due to seat and plug wear or dirt between the seat and plug.

Data are recorded in the background regardless of the operating mode selected if the tight-closing function (Code 14) is active. Data logging does not need to be activated.

The course of the end position records the valve position x and the signal pressure p together with the time stamp by the operating hours counter when the valve moves to the lower end position. The new recorded valve position is compared to the last saved

zero point. If it differs by the 'Recording

out

threshold' from the last value, the data of the

new zero point are saved. A graph of the recorded valve positions at

the lower end position is plotted over time. The positioner saves the valve positions in a

circular buffer, which holds 30 measured values at one time. The recorded measured data are listed in the Lower end position folder.

Dening parameters

1. Activate tight-closing function.

2. Dene 'Recording threshold'.

3. Select classication for status messages.

Fig. 15: Diagnostics > Monitoring/tests > Course of end position

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Course of end position



Device settings > Positioner > Transfer characteristic or Transfer characteristic on/ off

− Activate CLOSED end position (Code 14):

− CLOSED end position (Code 14):

0.0 to 49.9 %, [1.0 %]

Device settings > Alarm settings

− Recording threshold:

0.10 to 5.00 %, [0.25 %]

3.Device settings > Alarm settings > Status

classication > Valve position

Course of end position

− Monotonically increasing: [

− Monotonically decreasing: [ ], , ,

− Alternating: [ ], , ,

], , ,

10.1 Analysis and monitoring

A reference zero point must be recorded to analyze the course of the end position. This is recorded during the valve signature reference test (see u Section 4.1). In case a refer-

ence test has not been performed, the rst

zero point that the valve moved to serves as the reference value. The reference value is represented by a straight line in the course of end position graph.

not exceed the 'Zero limit' (Code 48 -

d5).

If the analysis of course of the end position pinpoints to a fault, the positioner generates

the 'Course of end position' message with the selected status classication.

Diagnostics > Monitoring > Valve position

− Course of end position:

, , ,

10.2 Resetting single status mes-

sages

The 'Course of end position' message and

the measured data for the course of the end position can be reset by selecting and exe-

cuting "Reset 'Course of lower end position".

If only the reference zero point is to be reset,

select and execute "Reset 'Reference values

for course of lower end position".

Diagnostics > Service/maintenance > Reset

− Reset 'Course of lower end position'

− Reset 'Reference values for course of lower end

position'

Note:

If the reference value has been reset by selecting and executing "Reset 'Reference values for course of lower end position" (see

u Section 2.1.1

the rst zero point that the valve

moves to after the reset serves as the new reference value, provided it does

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Valve dead band

11 Valve dead band

The difference in set point w that causes a minimal change in the valve position x is

termed ‘dead band’.

The valve dead band is affected by the friction hysteresis and the elastic processes in the valve stem packing.

The test is started in the manual mode.

The positioner species the set point w in a dened test range ('Lower range value' and 'Stop') in small steps and records the re-

sponse of the valve position x after waiting a

'Waiting time after step change'. The step

height is determined automatically from the

number of measured values ('No. until reversing') and the dened test range. The as-

cendent and descendent are plotted within

the test range. The response of the valve po-

sition x to the change in set point (∆w) is

plotted in a graph. The dead band is analyzed in the positioner

when a step height is smaller than 0.2%.

− 'Mean dead band': Average change in set point that causes a minimal change in the valve position.

− 'Min. dead band': Minimum change in set point that causes a minimal change in the valve position.

− 'Max. dead band': Maximum change in set point that causes a minimal change in the valve position.

Fig. 16: Diagnostics > Monitoring/tests > Dynamic tests > Valve dead band

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Valve dead band



Dening parameters

1. Switch to manual mode (Code0 = MAN).

2. Select test parameters.

3. Start test.

The 'Test information' status indicates 'Test active'. 'D3' and 'TEST' are indicat-

ed in alternating sequence on the positioner display.

'Function check'

condensed state.

Diagnostics > Service/maintenance > Operating mode

− Enter operating mode (Code 0): Manual

2.Diagnostics > Monitoring/tests > Dynamic

tests > Valve dead band

− Lower range value: 0.0 to 100.0 %,

[50.0%]

− Stop: 0.0 to 100.0 % [52.0 %]

− Waiting time after step change:

0.1 to 25.0 s, [1.0 s]

− No. until reversing: 1 to [50]

3. − Start test

is activated as the

11.1 Resetting single status messages

The diagnostic parameters and measured data of the last test are reset by selecting and

executing the command "Reset 'Valve dead

band". If the test is restarted and a test analysis has

already been performed, the analysis of the old test is overwritten.

Diagnostics > Service/maintenance > Reset

− Reset 'Valve dead band'

Note:

Cancel the test by right-clicking 'Cancel test' and selecting 'Execute' or by pressing the rotary pushbutton at the positioner. After the test has been canceled, the positioner remains in manual mode.

In TROVIS-VIEW4 the test information and progress ag of the test are displayed. The 'Test information' status indicates 'Test not active' after the test is nished.

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Valve dead band

x [%]

t [s]

x [%]

t [s]

Partial stroke test (PST)

Step response settings: Lower range value, Stop, Tolerance limit, Settling time

before starting test, Waiting time after step change, Sampling time, Number of

100

Max. test

duration

Max. break-

away time

START-UP

not moved

before

reaching the

max.

breakaway

time.

The valve has

before 'Perm.

step end' has

not reached

The valve has

Max. test

duration

exceeded

Other cancelation 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 â â â â â

TEST/PROCESS

step responses

Activate ramp function

â â

No Yes

Ramp time (increasing)

Ramp time (decreasing)

elation conditions

Canc

erm. time until

step end

x monitoring value

Status classication (NE 107)

PST/FST

Observe start conditions

Table 4

(see

)

Test interval

â â

Test start

â â

the 'Stop'

position

time until

elapsed.

Immediately

T start

â â

Time-con

trolled*

First PST after dening parameters =

Reference

Start further PST

Analysis (NE 107)/logged by operating hours counter

PST/FST

Reset 'PST parameters'

100

Δp out moni

toring value

The signal

The valve position has fallen below the monitoring value.

Other cancelation causes: solenoid valve triggered/forced venting active; Supply pressure too low; Too much friction; Step start too large; Change in set point; Current too low

pressure change has exceeded or fallen below the reference value.

PST tolerance

band

The valve position deviation exceeds the PST tolerance band.

* Note! The positioner is write-protected when tests are performed according to a schedule (local operation and operating software).

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Partial stroke test (PST)

12 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 breakaway torque must be overcome when the plug starts to move out of its open position. This breakaway torque depends on the seal, deposits on the seat and plug, the process medium and friction in the valve trim. After the breakaway torque has been overcome, it can be assumed that the valve is able to completely close. Recording the test results additionally allows an analysis of the dynamic control response.

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 conditions are met (see u Table 4):

− 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 'Fail-safe action limit' (Code49 - h2).

The following listed parameters are activated while the partial stroke test is being performed:

− Characteristic selection (Code 20): Linear

− Required transit time OPEN (Code 21):

Variable

− Required transit time CLOSED (Code 22):

Variable

Fig. 17: Diagnostics > Monitoring/tests > Dynamic tests > Partial stroke test (PST)

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Partial stroke test (PST)

Operating point –

Start PST

t [s]

During the partial stroke test, the valve moves from its current operating point to a

dened 'Stop' value and back to the initial

position again. The change in travel can be performed ei-

ther in steps or in a ramp function (Fig. 18). For the test in a ramp function, additionally the ramp times for the increasing and de-

creasing ramps need to be dened.

To perform a partial stroke test, the 'Lower range value' must be near the current operating point ± 'Tolerance limit'.

After being activated, the test does not start

until the 'Settling time before starting test' has elapsed. Based on the operating point, the valve moves until reaching the 'Stop'

x [%]

Operating point + Tolerance limit

Lower range value

Tolerance limit

Operating point

valve position. The valve remains in this po-

sition for the time dened by the 'Waiting time after step change' before performing a

second step change in the opposite direction

from 'Stop' to the operating position. The 'Sampling time' denes the time interval be-

tween which the measured values are recorded during the test.

Test cancelation conditions

Various cancelation conditions provide additional protection against the valve slamming shut or moving past the end position. The positioner cancels the partial stroke test when one of the following cancelation condi-

tions is fullled:

Start PST

Stop

∆t

decreasing

∆t

increasing

Settling time before

starting test

Waiting time after

‘Lower range value’ – ‘Stop’

step change

100

Settling time before

starting test

x ‘Ramp time (decreasing)’

x ‘Ramp time (increasing)’

Waiting time after

∆t

decreasing

step change

∆t

Fig. 18: Course of the partial stroke test with step response (left) and ramp function (right)

74 EB 8389-1S EN

increasing

Page 75

Partial stroke test (PST)



Cancelation conditions, time-out

− 'Max. test duration': The test is canceled when the maximum permissible test duration is reached.

− 'Max. breakaway time': The test is can- celed when the valve position has

reached less than 10% of the PST target travel after the dened time has elapsed.

This cancelation condition only becomes effective after it has been activated ("Ac-

tivate 'Max. breakaway time" = [Yes]).

− 'Perm. time until step end': The test is canceled when the time entered in 'Settling time before starting test' has

elapsed before the valve has reached its 'Stop' position. This cancelation condition only becomes effective after it has been activated ("Activate 'Perm. time until step end" = [Yes]).

Cancelation condition - valve position x (to check the valve position)

− 'x monitoring value': The test is canceled as soon as the valve position falls below the adjusted value. This cancelation condition only becomes effective after it has

been activated ('Activate x monitoring' =

Yes).

Cancelation condition, signal pressure Δp

out

− '∆p out monitoring value': The test is canceled if the change in signal pressure exceeds or falls below the reference value.

The reference value is made up of 'Δp out reference value' and 'Δp out monitoring value'. This cancelation condition

only becomes effective after it has been

activated ('Activate Δp out monitoring' =

Yes).

The positioner determines the '∆p out reference value' from both signal pres-

sures issued at the start and end of the step. It only applies to adjusted step change and ramp values.

Cancelation condition, tolerance band

− 'PST tolerance band': The test is canceled as soon as the deviation of the valve position (in relation to the step end value (Stop)) exceeds the adjusted PST tolerance band. This cancelation condition only becomes effective after it has been

activated ('Activate PST tolerance band monitoring' = Yes).

Note:

−

The partial stroke test must be performed with deactivated cancelation conditions for valves with doubleacting actuator and pneumatic booster as well as for valves that

have been initialized using the SUB

mode (substitute calibration).

−

Excessive overshooting may occur in

valves tted with boosters. In this

case, the cancelation conditions 'x

monitoring value' and 'PST toler

ance band' must be increased accordingly.

Additionally, the partial stroke test is canceled when one of the following events arises:

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Partial stroke test (PST)



− Cancel internal solenoid valve/forced venting: The test was canceled by the activation of the solenoid valve/forced venting function.

− Canceled by control loop error: A control loop error has occurred.

− Set point start difference too high: During

the step change, 'Lower range value' is outside the range (operating point ± 'Tolerance limit').

− Set point change: Time-controlled start of the test. Due to a set point change before

the step change, 'Lower range value' is outside the range (operating point + 'Tolerance limit').

− Current too low

− Supply pressure too low

− Electric current change: The partial stroke test of a control valve is canceled when

the change in electric current ≥ 'Tolerance band' (Code 19) arises.

The partial stroke test of an on/off valve is canceled when the valve moves from the operating position to the fail-safe position or from the fail-safe position to the operating position due to a change in electric current.

Note:

The 'Measured data storage out of memory' reading (Failure) is generat-

ed when the 'Sampling time' is too

low. After recording 100 measured values per variable, logging is stopped, but the test continues until it is completed.

After the partial stroke test is canceled, the

'PST status' reading indicates 'Not successful'. The reason for cancelation is marked by the 'Failure' message in the Measured data

assessment folder (> Current test).

Dening parameters

1. Dene parameters for the partial stroke test. See also u Note concerning setting the PST diagnostic parameters. (The default settings partly depend on the closing position ATO/ATC.)

2. Dene parameters for cancelation conditions.

3. Select classication for status messages.

4. Start the partial stroke test.

The 'Test information' status indicates 'Test active'. 'D4' and 'TEST' are indicat-

ed in alternating sequence on the posi-

tioner display. 'Function check'

is ac-

tivated as the condensed state.

1. Diagnostics > Monitoring/tests > Dynamic

tests > Partial stroke test (PST)

− Lower range value (Code 49 - d2): 0.0 to

100.0 %, [ATO: 100.0 %; ATC: 0.0 %]

− Stop (Code 49 - d3): 0.0 to 100.0 %

[ATO:90.0 %; ATC: 10 %]

− Tolerance limit: 0.1 to 10.0 %, [2.0 %]

− Activate ramp function (Code 49 - d4):

[Yes], No

− Settling time before starting test

(Code 49 - d7): 1 to 240s, [2 s]

− Waiting time after step change (Code 49 - d8):

1.0 to 240.0 s, [2.0 s]

− Sampling time (Code 49 - d9):

0.2 to 250.0s, [0.8s}

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Partial stroke test (PST)

Only when the ramp function is activated:

− Ramp time (decreasing) (Code 49 - d5): 0 to 9999 s, [600 s]

− Ramp time (increasing) (Code 49 - d6): 0 to 9999 s, [60 s]

2. − Max. test duration (Code 49 - E7): 30 to 25000 s, [90 s]

− Activate 'Max. breakaway time' [Yes], No

− Max. breakaway time: 0.0 to 25000 s,

[30.0s]

− Activate 'Perm. time until step end' [Yes], No

− Perm. time until step end:

0.0 to 25000 s, [70.0 s]

− Activate x monitoring (Code 49 - E0): [Yes],

− x monitoring value (Code 49 - E1): –10.0 to 110.0 %, [ATO: 0.0 %; ATC: 85 %]

− Activate Δp out monitoring (Code49 - A8):

[Yes], No

− Δp out monitoring value (Code 49 - A9):

0.00 to 7.00bar, [1.00 bar]

− Activate PST tolerance band monitor-

ing(Code 49 - E5): Yes, [No]

− PST tolerance band (Code 49 - E6):

0.1 to 100.0 %, [5.0 %]

3.Device settings > Alarm settings > Status

classication > PST/FST

− x cancelation: [

− Δp out cancelation: [ ], , ,

− Tolerance band exceeded: [ ], , ,

− Max. test duration exceeded:

], , ,

[

− Test canceled manually: [ ], , ,

− Measured data memory full: [ ], , ,

], , ,

− Cancel internal solenoid valve/forced venting: [ ], , ,

− Canceled by control loop error: [ ], , ,

− Set point start difference too high: [ ], , ,

− Set point change: [ ], , ,

− Current too low: [ ], , ,

− Max. breakaway time exceeded: [ ], , ,

− Perm. time until step end exceeded: [ ], , ,

− Canceled by supply pressure: [ ], , ,

4.Diagnostics > Monitoring/tests > Dynamic

tests > Partial stroke test (PST)

Either:

− Enter test start (Code 49 - A2) =

[Immediately]

− Start test

Or:

(only when 'Type of application' = On/off

valve)

− Enter test interval (Code 49 - A3): [1 h] to 2345 d

− Enter test start (Code 49 - A2) = Time-

controlled

NOTICE! The positioner is write-protected when tests are performed according to a schedule (local operation and operating software).

Code 0 reading: "O/C" and "PST" in

alternating sequence

Code 3 reading: "PST" blinks.

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Partial stroke test (PST)



Note:

Cancel the test by right-clicking 'Cancel test' and selecting 'Execute' or by pressing the rotary pushbutton at the positioner. After the test has been canceled, the positioner remains in select-

ed mode. The 'PST status' reading in dicates 'Not successful'.

In TROVIS-VIEW4 the test information and progress ag of the test are displayed. The 'Test information' status indicates 'Test not active' after the test is nished.

Note concerning setting the PST diagnostic parameters

− We recommend only to start the partial stroke test when the valve is in the end position. In on/off valves, the start value must be the same as the operating point.

− The 'Ramp time (increasing)' must be greater than the corresponding value for

'Min. transit time CLOSED' (Code 41)

determined during initialization.

− The 'Ramp time (decreasing)' must be greater than the corresponding value for 'Min. transit time OPEN' (Code 40) determined during initialization.

− The 'Sampling time' must not be lower

than the indicated 'Recommended min. sampling time'. The 'Recommended min. sampling time' is calculated from the 'Expected duration of test'.

12.1 Start triggered by the set point

The partial stroke test of on/off valves is triggered when the set point w moves in the

range between 25 and 50% of the travel

and remains there for longer than six sec-

onds. See u Section 5 and chart u page

72.

The PST diagnostic parameter 'Lower range value' must be within the dened position ± 'Tolerance limit' for the partial stroke test to start.

The test and its cancelation are described in section 12, while the test assessment is described in u Section 12.3.

12.2 Start triggered by the binary input

If the positioner is tted with the optional binary input, the partial stroke test can be started by the binary input when the conditions to start the partial stroke test are met:

− 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 'Safety set point' is greater than the 'Fail-safe action limit'

(Code 49 - h2).

The test and its cancelation are described in section 12, while the test assessment is described in u Section 12.3.

It is important to make sure that the diagnostic parameter 'Lower range value' of the

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Partial stroke test (PST)



partial stroke test is within the range of the 'Safety set point' ± 'Tolerance limit'.

Dening parameters

1. Select 'Binary input' in 'Positioner accessories identication'.

2. Congure the binary input.

3. Select classication for status message.

Device settings > Positioner > Options

− Positioner accessories identication: Binary

input

2.Device settings > Positioner > Options >

Conguration, binary input

− Binary input conguration: [For oating contact (switch function)], For non-oating

contact (0-24 V)

− Select function: Start PST

− Binary input control: Activate function: switch open, [Activate function: switch closed]

− Safety set point: 0.0 to 100.0 %, [50.0%]

3. − Binary input classication: ], , ,

[

Note:

Further details on optional binary input u Section 15.

12.3 Analysis and monitoring

The analysis of the last three partial stroke tests are saved with a time stamp in the PST measured data assessment folder. A graph of the last partial stroke test is shown in the

Partial stroke test (PST) folder.

Test completed successfully

When a partial stroke test has been completed successfully, the analyzed parameters are displayed separately for the increasing and decreasing characteristics.

Analysis of measured data (step response test):

− 'Overshooting' (relative to the step height) [%]

− 'Dead time' [s]

− 'T86' [s]

− 'Settling time' [s]

Analysis of measured data (ramp test):

− 'Overshooting' (relative to the step height) [%]

The results of the rst partial stroke test are

used as the reference measurement.

Note:

Changes in the diagnostic parameters listed below affect the test. The results of the next following partial stroke test is used as the new reference measurement:

− 'Lower range value'

− 'Stop'

− 'Activate ramp function'

− 'Ramp time (increasing)'

− 'Ramp time (decreasing)'

− 'Waiting time after step change'

− Test not completed

If the test was not completed, the reason for cancelation is indicated in the corresponding reading by the 'Failure' message. The posi-

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Page 80

Partial stroke test (PST)



tioner generates a 'PST/FST' message with the selected status classication.

Diagnostics > Monitoring

− PST/FST status (Code 84):

Note:

The ‘No test available’ status remains

active until a partial stroke is completed successfully.

, , ,

12.4 Resetting single status messages

The diagnostic parameters and measured data analysis of the partial stroke test are reset by selecting and executing the command

“Reset ‘PST parameters”.

The positioner saves the measured data analysis of the last three partial stroke tests. The analysis of the penultimate test is deleted when another test is performed.

Diagnostics > Service/maintenance > Reset

− Reset 'PST parameters'

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Page 81

Table 4: Start options for the partial stroke test (PST)

Operating mode

Type of application

PST start

Rotary pushbut-

ton or operating

software

See page 73 See page 73 See section12.1 See section12.2

Manual Automatic Automatic Automatic

Test interval

(time-controlled) Set pointw Binary input

Partial stroke test (PST)

Automatic mode AUTO

Manual mode

Control valve

MAN

Automatic mode AUTO

Manual mode

On/off valve

MAN

Triggering event

Not possible Not possible – Not possible

Possible Not possible – Possible

Possible Possible Possible Possible

Possible Possible Not possible Possible

Code 49 - A0 =

YES or

'Start test'

parameter

activated

'Test interval'

elapsed

Set point is six

seconds long in

the range

between 25 and

50% of travel

Binary input

changes to ‘Switch

open’ or ‘Switch

closed’ (see ‘Binary

input control’

parameter

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Page 82

Partial stroke test (PST)

x [%]

t [s]

x [%]

t [s]

Full stroke test (FST)

100

START-UP

Solenoid valve

triggered/forced

venting active;

Control loop error; Set point start difference

too high; Current

too low; Supply

pressure too low

Max. test duration

exceeded

â â â â â

Manual mode (TEST)

Prerequisite

– Operating mode: Manual

Tolerance limit, Settling time before starting test,

Waiting time after step change, Sampling time

ivate ramp function

Act

â â

Yes

Ramp time (increasing)

Ramp time (decreasing)

elation condition

Canc

Max. test duration Max. breakaway time

Status classication

PST/FST

Start FST

The valve has not moved before reaching the max. breakaway time.

Analysis (NE 107)/logged by operating hours counter

PST/FST

Reset 'FST parameters'

100

Perm. time until

CLOSED position

The valve has not reached the

'Stop'

position before

'Perm. time

until CLOSED

position' has

elapsed.

Recommended

82 EB 8389-1S EN

Page 83

Full stroke test (FST)

13 Full stroke test (FST)

The dynamic valve performance can be evaluated by performing this test.

The full stroke test is started in the manual mode.

The following listed parameters are activated while the full stroke test is being performed:

− Characteristic selection (Code 20): Linear

− Required transit time OPEN (Code 21): Variable

− Required transit time CLOSED (Code 22): Variable

During the full stroke test, the valve moves through its entire working range.

The rst step ends in the fail-safe position. As

a result, the second step starts from the failsafe position.

The change in travel can be performed either in steps or in a ramp function (Fig. 20). For the test in a ramp function, additionally the times for the increasing and decreasing

ramps need to be dened.

After being activated, the test does not start

until the 'Settling time before starting test'

has elapsed. This ensures that the valve has reached the start position.

Starting from the start position, the valve moves to the fail-safe position. The valve re-

mains in this position for the time dened by the 'Waiting time after step change' before

performing a second step change in the opposite direction from the fail-safe position to

the start position of the rst step. After the 'Waiting time after step change' has

elapsed, the valve moves back to its operating point.

Fig. 19: Diagnostics > Monitoring/tests > Dynamic tests > Full stroke test (FST)

EB 8389-1S EN 83

Page 84

Full stroke test (FST)

Operating point +

Operating point –

t [s]

x [%]

The 'Tolerance limit' parameter denes the

permitted valve positions for the start value and the end value for the step.

The 'Sampling time' denes the time interval

between which the measured values are recorded during the test.

Test cancelation conditions

Various cancelation conditions provide additional protection against the valve slamming shut or moving past the end position. The positioner cancels the full stroke test when one of the following cancelation conditions is

fullled:

Tolerance limit

100

Operating point

− 'Max. test duration': The test is canceled when the maximum permissible test duration is reached.

− 'Max. breakaway time': The test is can-

celed when the time entered in 'Settling time before starting test' has elapsed and

the valve has still not changed its position. This cancelation condition only becomes effective after it has been activat-

ed ("Activate 'Max. breakaway time" =

[Yes]).

∆t

decreasing

increasing

Settling time before

starting test

‘Lower range value’ – ‘Stop’

100

‘Step start’ – ‘Step end’

100

Waiting time after

step change

Waiting time after

step change

x ‘Ramp time (decreasing)’

x ‘Ramp time (increasing)’

Settling time before

starting test

Waiting time after

∆t

decreasing

step change

∆t

increasing

Fig. 20: Course of the full stroke test with step response (left) and ramp function (right), fail-close

84 EB 8389-1S EN

Waiting time after

step change

Page 85

Full stroke test (FST)



− 'Perm. time until CLOSED position': The test is canceled when the valve does not reach the CLOSED position before the adjusted time has elapsed. This cancelation condition only becomes effective after it has been activated ("Activate 'Perm. time until step end" = [Yes]).

Additionally, the full stroke test is canceled when one of the following events arises:

− Cancel internal solenoid valve/forced venting: The test was canceled by the activation of the solenoid valve/forced venting function.

− Canceled by control loop error: A control loop error has occurred.

− Set point start difference too high: During

the step change, 'Lower range value' is outside the range (operating point ± 'Tolerance limit').

− Current too low

− Supply pressure too low

Note:

The 'Measured data storage out of memory' reading (Failure) is generat-

ed when the 'Sampling time' is too

low. After recording 100 measured values per variable, logging is stopped, but the test continues until it is completed.

After the full stroke test is canceled, the 'FST status' reading indicates 'Not successful'. The

reason for cancelation is marked by the

'Failure' message in the Measured data assessment folder (> Current test).

Dening parameters

1. Switch to manual mode (Code0 =MAN).

2. Dene parameters for full stroke test. See also u Note concerning setting the FST diagnostic parameters.

3. Dene parameters for cancelation conditions.

4. Select classication for status messages.

5. Start full stroke test.

The 'Test information' status indicates 'Test active'. 'D6' and 'TEST' are indicat-

ed in alternating sequence on the posi-

tioner display. 'Function check'

is ac-

tivated as the condensed state.

Diagnostics > Service/maintenance > Operating mode

− Enter operating mode (Code 0): Manual

2.Diagnostics > Monitoring/tests > Dynamic

tests > Full stroke test (FST)

− Tolerance limit: 0.1 to 10.0 %, [2.0 %]

− Activate ramp function: [Yes], No

− Settling time before starting test:

[1] to 240s

− Waiting time after step change:

[2.0] to 25.0s

− Sampling time: 0.2 to 250.0 s, [1.4s]

Only when the ramp function is activated:

− Ramp time (increasing): 0 to 9999 s, [60 s]

− Ramp time (decreasing): 0 to 9999 s, [60 s]

3. − Max. test duration: 30 to 25000 s, [140 s]

− Activate 'Max. breakaway time': Yes, [No]

− Max. breakaway time: 0.0 to 25000 s,

[30.0s]

EB 8389-1S EN 85

Page 86

Full stroke test (FST)

− Activate 'Perm. time until CLOSED position exceeded': Yes, [No]

− Perm. time until CLOSED position exceeded:

0.0 to 25000 s, [70.0 s]

Device settings > Alarm settings > Status classication > PST/FST

− Max. test duration exceeded:

], , ,

[

− Test canceled manually: [ ], , ,

− Measured data memory full: [ ], , ,

− Cancel internal solenoid valve/forced venting: [ ], , ,

− Canceled by control loop error: [ ], , ,

− Set point start difference too high: [ ], , ,

− Set point change: [ ], , ,

− Current too low: [ ], , ,

− Max. breakaway time exceeded: [ ], , ,

− Perm. time until CLOSED position exceeded: [ ], , ,

− Canceled by supply pressure: [ ], , ,

− The 'Ramp time (decreasing)' must be greater than the corresponding value for 'Min. transit time OPEN' (Code 40) determined during initialization.

− The 'Sampling time' must not be lower

than the indicated 'Recommended min. sampling time'. The 'Recommended min. sampling time' is calculated from the 'Expected duration of test'.

4.Diagnostics > Monitoring/tests > Dynamic

tests > Full stroke test (FST)

Start test

Note concerning setting the FST diagnostic parameters

− The 'Ramp time (increasing)' must be greater than the corresponding value for

'Min. transit time CLOSED' (Code 41)

determined during initialization.

86 EB 8389-1S EN

Page 87

Full stroke test (FST)



13.1 Analysis and monitoring

The analysis of the last three full stroke tests are saved with a time stamp in the FST mea-

sured data assessment folder.

Test completed successfully

When a full stroke test has been completed successfully, the analyzed parameters are displayed separately for the increasing and decreasing characteristics.

Analysis of measured data (step response test):

− 'Overshooting' (relative to the step height) [%]

− 'Dead time' [s]

− 'T86' [s]

− 'Settling time' [s]

Analysis of measured data (ramp test):

− 'Overshooting' (relative to the step height) [%]

The results of the rst full stroke test are used

as the reference measurement.

Note:

Changes in the diagnostic parameters listed below affect the test. The results of the next following full stroke test is used as the new reference measurement:

− 'Activate ramp function'

− 'Ramp time (increasing)'

− 'Ramp time (decreasing)'

− 'Waiting time after step change'

Test not completed

If the test was not completed, the reason for cancelation is indicated in the corresponding

reading by the 'Failure' message. The positioner generates a 'PST/FST' message with the selected status classication.

Diagnostics > Monitoring

− PST/FST status (Code 84):

Note:

The 'No test available' status remains

active until a full stroke is completed successfully.

, , ,

13.2 Resetting single status messages

The diagnostic parameters of the full stroke test are reset by selecting and executing the

command 'Reset FST parameters'. The measured data analysis and the 'PST/FST status'

message cannot be reset. The positioner saves the measured data

analysis of the last three full stroke tests. The analysis of the penultimate test is deleted when another test is performed.

Diagnostics > Service/maintenance > Reset

− Reset 'FST parameters'

EB 8389-1S EN 87

Page 88

SIL operator test

+81 -82 +11 -12

+83

-84 +51

-52

A2A3 A1

+41 -42

+31 -32

14 SIL operator test

The SIL operator ensures that the safety function of the positioner is working. The safety function is based on the shutdown of the i/p converter (6, Fig. 22). This causes the pneumatic actuator to be vented and the valve to move to its fail-safe position.

Monitoring of the input signal

The i/p converter is switched off when the input signal of the positioner at terminals

+11/ –12 falls below 3.8mA or 4.4mA depend-

ing on the positioner version (a signal range

of 4 to 20mA is required). See Fig. 21.

Optional Optional Optional Optional

Monitoring the voltage supply (version with forced venting and solenoid valve)

The i/p converter and the solenoid valve (when installed) are shut down whenever the

voltage at terminals +81/–82 falls below 12V (an input voltage of 24V DC is re-

quired). See Fig. 21. The SIL operator test checks the emergency

shutdown by the integrated safety function (SIL). It can be started in the manual or automatic mode of control valves.

The positioner generates a permanent message in the event that an error occurs during the operator test. All control properties of the positioner remain kept. Only the emergency shutdown function of the positioner is no longer guaranteed.

A2A3 A1

+81 -82 +11 -12

24 V DC

Forced

venting/

solenoid valve

(optional)

control

signal

-84 +51

+83

Switching amplier according to EN 60947-5-6

ault

A3 F

alarm

output

-52

Limit switches

Softwar

+41 -42

Software

optionally

ive

induct

+31 -32

Two-wire transmitter Supply unit

only for

optional

ansmitter

+31 -32

Leakage

sensor

+31 -32

Binary input

Fig. 21: Electrical connections

88 EB 8389-1S EN

Page 89

24 V DC

Serial

Interface

FSK

>12 V

17 18

12 25

SIL operator test

1 Control valve 14 Software limit switches A1/A2 2 Travel sensor 15 Störmeldeausgang A3 3 PD controller 16 LCD 4 A/D converter 17* Actuation of solenoid valve 5 Microcontroller 18* Electrical insulation 6 i/p converter 19 D/A converter 7 Air capacity booster 20 Communication interface

8 Pressure regulator 21 HART

connection

9 Flow regulator 22 Binary input BE*

10 Volume restriction 23 Pressure sensor for supply air ps

11* Inductive limit switch 24 Pressure sensor for signal pressure p

out

12* Solenoid valve 25* Forced venting 13* Analog position transmitter or

binary input * Options

Fig. 22: Functional diagram

EB 8389-1S EN 89

Page 90

SIL operator test

NOTICE

The SIL operator test causes the valve

to automatically move. It must only be started when the plant allows it.

Dening parameters

1. Set Type of application to Control valve.

2. Apply an external set point:

4.0 to 4.5 mA for 3.8 mA emergency shutdown

4.8 to 5.5 mA for 4.4 mA emergency shutdown

3. Start SIL operator test. S001 to S030 appear on the positioner display one after the other.

Start-up

− Type of application (Code 49 - h0): Control

valve

3.Diagnostics > Service/maintenance > SIL

operator test

− Start SIL operator test

The emergency shutdown function of the positioner is no longer guaranteed. The positioner needs to be returned immediately to

SAMSON.

Diagnostics > Service/maintenance > SIL operator test

− SIL test:

14.1 Analysis and monitoring

SIL operator test completed successfully

OK appears on the positioner display.

SIL operator test not completed

Possible error code E001 to E030 appears on the positioner display. The positioner generates the permanent error code 86 (Fail-

ure - this status classication cannot be

changed).

90 EB 8389-1S EN

Page 91

Binary input



15 Binary input

TROVIS SAFE 3730-6xxxxx3x00x0x00

The positioner has an optional binary input to activate various functions:

− [Transmit switching state] The switching state of the binary input is logged.

− Activate local write protection

After the rst initialization, a local write

protection can be activated. While the binary input is active, no settings can be changed at the positioner. The positioner cannot be restarted. Enabling conguration over Code 3 is not active.

− Start PST The positioner starts a single partial stroke test. The test is performed using the settings in Code 49 - d2 to Code 49

- d9. See u Section 12.

− Move valve to safety set point An on/off valve moves to the predetermined safety set point when the positioner is in automatic mode. This function is not performed if the positioner is in the manual mode or fail-safe position mode.

− Switch AUTO/MAN The positioner changes from the automatic mode to the manual 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 u Section 3.

− Reset diagnostics Active monitoring and dynamic tests are stopped and the diagnostic data is reset once.

Note:

The optional binary input can only be

congured using the TROVIS-VIEW4

software and using the DD parameters. In the default setting, the switch state is logged with a closed switch.

Dening parameters

Note:

− The parameters can only be dened in TROVIS-VIEW4 after the 'Positioner accessories identication' has

been set to 'Binary input'.

−

The 'Safety set point' can only be set

when the 'Type of application' is set to 'On/off valve'.

1. Select 'Binary input' in 'Positioner accessories identication'.

2. Congure the binary input.

Device settings > Positioner > Options

− Positioner accessories identication: Binary input

EB 8389-1S EN 91

Page 92

Binary input

2.Device settings > Positioner > Options >

Conguration, binary input

− Binary input conguration: [For oating contact (switch function)], For non-oating

contact (0-24 V)

− Select function: [Transmit switching state], Activate local write protection, Start PST, Move valve to safety set point, Switch

AUTO/MAN, Start data logger, Reset

diagnostics

− Binary input control: Activate function: switch open, [Activate function: switch closed]

− Safety set point: 0.0 to 100.0 %, [50.0 %] (only when Type of application = On/off valve)

− Binary input classication: [

], , ,

92 EB 8389-1S EN

Page 93

Dynamic HART® variables

16 Dynamic HART® variables

The HART® specication denes four dynamic variables consisting of a value and an engineering unit. These variables can be assigned to device parameters as required. The universal HART namic variables out of the device. This allows manufacturer-specic parameters to also be transferred using a universal command.

In the TROVIS SAFE3730-6 Positioner, the

dynamic variables can be assigned in the

Device settings folder (> Positioner > HART communication) as listed in uTable 5:

Device settings > Positioner > HART communication

− Primary variable assignment: [Set point], Direction of action set point, Set point after

transit time specication, Valve position, Set

point deviation e, Absolute total valve travel,

Binary input status, Internal solenoid valve/

forced venting status, Condensed state, Temperature, Leakage sensor sound level, Ambient pressure, Signal pressure p out, Supply pressure, Flow rate, Differential pressure, All active errors

− Secondary variable assignment: Set point, Direction of action set point, Set point after

transit time specication, [Valve position], Set

point deviation e, Absolute total valve travel,

Binary input status, Internal solenoid valve/

forced venting status, Condensed state, Temperature, Leakage sensor sound level, Ambient pressure, Signal pressure p out, Supply pressure, Flow rate, Differential pressure, All active errors

command 3 reads the dy-

− Tertiary variable assignment: Set point, Direction of action set point, Set point after

transit time specication, Valve position, [Set

point deviation e], Absolute total valve travel,

Binary input status, Internal solenoid valve/

forced venting status, Condensed state, Temperature, Leakage sensor sound level, Ambient pressure, Signal pressure p out, Supply pressure, Flow rate, Differential pressure, All active errors

− Quaternary variable assignment: Set point, Direction of action set point, Set point after

transit time specication, Valve position, Set

point deviation e, [Absolute total valve travel],

Binary input status, Internal solenoid valve/

forced venting status, Condensed state, Temperature, Leakage sensor sound level, Ambient pressure, Signal pressure p out, Supply pressure, Flow rate, Differential pressure, All active errors

EB 8389-1S EN 93

Page 94

Dynamic HART® variables

Table 5: Dynamic HART® variables assignment

Variable Meaning Unit

Set point Set point % Direction of action set point Direction of action set point % Set point after transit time

specication

Valve position Valve position % Set point deviation e Set point deviation e % Absolute total valve travel Absolute total valve travel –

Binary input status 0 = Not active

Internal solenoid valve/forced venting status

Condensed state 0 = No message

Temperature Temperature °C Leakage sensor sound level Leakage sensor sound level dB Ambient pressure Ambient pressure mbar Signal pressure p out Signal pressure p Supply pressure Supply pressure bar Flow rate Flow rat m³/h Differential pressure Differential pressure bar All active errors 0 = No errors

Set point after transit time specication %

1 = Active 255 = –/–

0 = De-energized 1 = Energized

2 = Not installed

1 = Maintenance required 2 = Maintenance request 3 = Failure

4 = Out of specication

7 = Function check

out

1 = Control loop 2 = Zero 4 = w too low 8 = PST/FST status 16 = On/off error activated 32 = SIL test 64 = Set point outside range 128 = Total valve travel exceeded 256 = Operating mode not AUTO

–

bar

–

94 EB 8389-1S EN

Page 95

Appendix

17 Appendix

17.1 Code list

Code

Parameter – Readings/

no.

values [default setting]

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

48* Diagnostic parameters

Description

d0 Temperature

Read only

d1 Min. temperature

Read only

d2 Max. temperature

Read only

d3 No. of zero calibra-

tions

Read only

d4 No. of initializations

Read only

d5* Zero limit

0.0 to 100.0%, [5.0%] of the nominal

range, ESC

d6 Condensed state

Read only

Current operating temperature [°C] inside the positioner (accuracy

±3%)

Lowest temperature [°C] recorded inside the positioner since starting the operating hours counter

Highest temperature [°C] recorded inside the positioner since starting the operating hours counter

The number of zero calibrations performed since last initialization

Number of initializations performed since last start with default

values

Valve position limit relating to nominal range

'Zero point' message (Code58) triggered depending on selected status classication if limit is exceeded.

Note: The 'Zero point' message (Code58) has the default status classication 'Maintenance required'. This classication can only be changed in the operator software (e.g. TROVIS-VIEW).

Summary of all status messages classied according to NAMUR Recommendation NE107 OK: No message

C: Maintenance required CR: Maintenance demanded

S: Out of specication B: Failure

I: Function check

EB 8389-1S EN 95

Page 96

Appendix

Code

Parameter – Readings/

no.

values [default setting]

Description

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

48* d7 Supply pressure p

Current supply pressure [bar]

Read only

d8 Signal pressure p

out

Read only

d9 Flow rate

Read only

d10 Differential pressure

Read only

d11*

Direction of action (actuator)

[-/-], SA, DA, ELSE, ESC

Diagnostic parameters h

h0* Initialization including

valve signature

No, [YES], ESC

h1, h2

Current signal pressure [bar]

Current valve ow rate

Note: – – – – appears on the display when the ow rate calcula- tion is not active or has failed.

Current differential pressure [bar]

Indicates the actuator's direction of action

SA: Single-acting DA: Double-acting ELSE: Other

Initialization with [YES] or without [No] plotting the valve signature

The valve signature involves the signal pressure p

being plotted

out

in relation to the valve position. Regardless of the adjusted settings, the valve signature is recorded

automatically when initializing a positioner that has not yet been

initialized (e.g. after initialization was reset (Code36 - Std and Code36 - DS)), after each further initialization if the settings for 'Initialization mode', 'Pin position', 'Direction of action', 'Pressure limit', 'Proportional-action coefcient Kp level' or 'Derivative-action time Tv level' were changed, and when the switch position (ATO/

ATC) was changed.

Note: The valve signature is required to perform diagnostic functions.

Unassigned

96 EB 8389-1S EN

Page 97

Appendix

Code

Parameter – Readings/

no.

values [default setting]

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

48* h3* Desired time until 'Re-

set measured diagnostic data'

[0] to 365 days, ESC

h4 Remaining time until

'Reset measured diagnostic data'

Read only

49* Partial stroke test (PST)

A Partial stroke test (PST)

A0* Start test

[No], YES, ESC

A1 Time until next test

Read only

Description

Time interval for scheduled resetting of measured diagnostic data

Remaining time (time and unit of time displayed in alternating sequence) until the next scheduled reset of the diagnosis data

Starts partial stroke test (test D4). The valve moves through the test range (Lower range value

(Code49 - d2) to Upper range value (Code49 - d3)) and back

again in a ramp or in steps. Recorded variables: time, set point, valve position, set point devia-

tion, control signal.

Remaining time (time and unit of time displayed in alternating sequence) until the the next time-controlled test starts

A2* Test start

AUTO, [MAN], ESC

The write protection is active in the AUTO setting (local operation and operation over software locked).

A3* Test interval Time interval (time and unit of time displayed in alternating se-

A4 Unassigned

A5 Recommended min.

sampling time

Read only

Activates (AUTO) or deactivates (MAN) the time-controlled partial

stroke test.

quence) between time-controlled tests

Sampling time [s] used to record entire step response in the graph of the partial stroke test

Page 98

Appendix

Code

Parameter – Readings/

no.

values [default setting]

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

49* A6 Unassigned

A7 Δp_out reference val-

Read only

A8* Activate Δp_out moni-

toring

[NO], YES, ESC

A9* Δp_out monitoring

value

0.00 to 7.00bar, [1.00bar,] ESC

d Step parameters for the partial stroke test (PST)

d0, d1

d2* Lower range value

0.0 to [100.0]%, ESC

d3* Upper range value

0.0 to 100.0%, [90.0%], ESC

d4* Activation of ramp

function

No, [YES]

d5* Ramp time (decreas-

ing)

0 to 9999s, (600s],

ESC

Description

The valve moves to the lower range value (Code49 - d2) and upper range value (Code49 - d3) with a certain signal pressure. These signal pressures are used to form the Δp_out reference value

[bar].

Note: The reference value only applies to the adjusted step and ramp values.

Activates Δp_out monitoring (YES) or deactivates it (No)

Test canceled if signal pressure change exceeds or falls below the

reference value. The reference value is made up of Δp_out reference value Δp_out reference value (Code49 - A7) and the Δp_out

monitoring value.

Unassigned

Start value of the test range

Note: To perform a partial stroke test, the 'Lower range value' must be near the current operating point ± 'Tolerance limit'.

The Tolerance limit is 2.0% by default. It can be changed in the operator software, e.g. TROVIS-VIEW.

End value of the test range

YES: The valve is moved through the test range within the ad-

No:

The time required by the valve to move through the range from

CLOSED to OPEN position. The time to move from Lower range value (Code49 - d2) to Upper

range value (Code49 - d3) is calculated:

|Upper range value – Lower range value| / 100 x Ramp time (increasing)

justed ramp time. The valve is moved in steps through the test range (step

response).

98 EB 8389-1S EN

Page 99

Appendix

Code

Parameter – Readings/

no.

values [default setting]

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

49* d6* Ramp time (increas-

ing)

0 to 9999s, [60s],

ESC

d7* Settling time before

starting test

1 to 240s, [2s], ESC

Description

The time required by the valve to move through the range from

OPEN to CLOSED position. The time to move from Upper range value (Code49 - d3) to Lower

range value (Code49 - d2) is calculated:

|Lower range value – Upper range value| / 100 x Ramp time (decreasing)

Settling time between reaching the upper range value (Code49 -

d3) and the valve moving through the test range in the reverse direction

d8* Waiting time after

step change

1.0 to 240.0s, [2.0s],

ESC

d9* Sampling time

0.2 to 250.0 s, [0.8s],

ESC

E Cancelation conditions of the partial stroke test (PST)

E0* Activate x monitoring

No, [YES]

E1* x monitoring value

–10.0 to 110.0%, [85.0%] of total travel,

ESC

E2, E3, E4 Unassigned

E5* Activate PST tolerance

band monitoring

[No], YES

E6* PST tolerance band

0.1 to 100.0%, [5.0%], ESC

Waiting time between step change from Lower range value (Code49 - d2) to Upper range value (Code49 - d3) and vice versa

Interval for measured data recording

Activates x monitoring (YES) or deactivates it (No)

The test is canceled when the valve position – falls below the adjusted value (step end < step start) – exceeds the adjusted value (step end > step start)

Activates PST tolerance band monitoring (YES) or deactivates it

(No)

The test is canceled when the valve position's deviation (relating to

step end) exceeds the adjusted value.

EB 8389-1S EN 99

Page 100

Appendix

Code

Parameter – Readings/

no.

values [default setting]

Note: Codes with marked with an asterisk (*) must be enabled with Code3 prior to conguration.

49* E7* Max. test duration

30 to 25000s, [90 s],

ESC

E9* Reset 'PST parame-

ters'

F Partial stroke test (PST) information · Read only

F0 No test available

F2 x cancelation The test was canceled.

F3 Δp_out cancelation The test was canceled.

F4 Tolerance band ex-

ceeded

F5 Max. test duration ex-

ceeded

F6 Test canceled manual-

F7 Measured data mem-

ory full

F8 Cancel internal sole-

noid valve/forced venting

Description

Test canceled when max. test duration is reached.

Unassigned

Resets partial stroke test parameters.

Unassigned

The valve position fell below the x monitoring value (Code49 -

E1).

The signal pressure change Δp_out exceeded or fell below the reference value.

The valve position deviation exceeds the PST tolerance band

(Code49 - E6).

The test was canceled.

The Max. test duration (Code49 - E7) was reached.

The Sampling time (Code49 - d9) is too low. After recording 100

measured values per variable, logging is stopped, but the test continues until it is completed.

The test was canceled. The internal solenoid valve has been energized/the forced venting

has been activated.

100 EB 8389-1S EN

Samson TROVIS SAFE 3730 Series, TROVIS SAFE 3730-6, 3730 Series, 3730-6 Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual