Displacement (Travel) Series Monitoring Instrument Parameter Configuration

2019-09-18

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As described in 〖DF9000 Programmable TSI Instrument Configuration Software Operating Instructions〗, we want to conduct parameter configuration for DF series monitoring instrument, the following steps are standard:

 

Connect computer terminal serial cable, start the computer;

 

Connect the sensor;

 

Plug the serial cable into the instrument front panel interface and turn on the instrument;

 

Start 【DF9000 programmable TSI instrument configuration software】;

 

Create or open the project where the instrument belongs in;

Create or open the instrument configuration parameter file; and correctly set the monitor number, Product ID ---- product serial number.

 

Execute the menu operations: 『communication』 ---- 「connection」. Confirm a successful connection of the computer with instrument communication.

 

If necessary, execute menu operations: 『configuration』 ---- 「read」, read out all the configuration parameters from the instrument, and cover the parameter data in the instrument configuration parameter file;

 

Execute the menu operations: 『Configuration』 ----「Edit」 to edit the configuration parameter file;

 

Upon completion of the configuration parameter file edit: execute 『configuration』 ----「test」, download the configuration parameters into the instrument for running;

 

After the configuration parameter test: execute 『configuration』 ----「application」, configuration parameters will be downloaded and programmed into the instrument;

 

The instrument automatically resets and operates with new parameters.

 

In particular, after the parameter programming is completed, it must pass the “configuration-----test”, and wait for 60 seconds, then put the relay into interlock operation. If you do not perform this step, all the relays are likely to be automatically disarmed by software and cannot be put into operation.

 

We classify the following monitoring instruments into one class ---- 【displacement (travel) class monitoring instrument】:

 

The following monitoring instruments that can be configured and connected with eddy current displacement sensors:

 

DF2002  dual-channel axial displacement monitor

 

DF2022  dual-channel relative expansion monitor

 

DF9002  dual-channel axial displacement monitor

 

DF9022  dual-channel relative expansion monitor

 

DF3712  axial displacement transmitter

 

The following monitoring instruments that can be configured and connected with LVDT sensors:

 

DF2032  dual-channel thermal expansion monitor

 

DF2082  dual-channel valve location and travel monitor

 

DF9032  dual-channel thermal expansion monitor

 

DF3931  thermal expansion transmitter

 

Opening the configuration parameter file for displacement (travel) class monitoring instrument, perform menu operations: 『Configuration』 ----「Edit」, then enter:

 

Parameter setting----- Axial displacement · Relative expansion window

 

Or: parameter setting - Thermal expansion · Travel window

 

Both are actually the same, only the title is different.

 

Take【parameter setting----- axial displacement · relative expansion】 window as an example, it has seven tabs in total, click the name position over each tab, it will switchover the display of each tab: basic components setting tab, Channel A setting tab, A sensor linearization tab, A sensor linearization tab, Channel B-setting tab, B sensor linearization tab, output setting 1 tab , output setting 2 tab. The contents of each tab are as follows:

 

Basic components setting tab

 

Display the system name where the monitor is located, monitor number, component name and product ID;

 

Basic components setting, select the instrument operation mode, Channel A (B) bypass or work

 

Channel A (B) basic setting, choose sensor type, measuring unit dimension etc.

Channel A setting tab

 

Sensor parameters: sensor output range, linear range, sensitivity, etc.;

 

Measuring parameters: measuring range, zero point voltage and zero point values, etc.

 

Measuring direction, bevel compensation, safety barrier compensation and sensor linearity correction:

 

Sensor A linearization tab

 

21 sets of data can be entered for each eddy current sensor for linearity correction of the sensor;

 

Channel B Setting tab

 

See description for Channel A setting tab.

 

Sensor B linearization tab

 

See description for Sensor A linearization tab.

 

Output setting 1 tab

The tab can set control modes such as instrument alarm, danger combinational logic, and difference identification, interlocking control is put in or not, etc.;

 

Output Setting 2 tab

 

The tab can set instrument alarm current or voltage output form;

It can set OK, warning, danger limits, difference value limits, relay delay, and alarm hysteresis, etc.

 

 

『system name,』『instrument name』『instrument number』

 

From the previous the project name and configuration parameter file name, here they cannot be changed;

 

『Product ID』

 

The 〖product serial number〗 marked on【Instrument certificate of conformity】 or on the rear terminal board of the instrument should be correctly set up when opening or creating new parameter file, here they cannot be changed.

 

in the instrument software, the product serial number of the instrument has been stored and solidified; in each communication process, the computer and instrument must first send product ID, and mutually check. If both are the same, the communication will be effective; if both are different, communication will be interrupted, and an error message will be prompted;

 

『Instrument operation mode』

 

There are following four types that can be selected by opening the combinational list box:

 

Single-channel operation: only one of two channels can operate;

 

Two channels independent measurement: each of two channels measures a parameter, there is no contact with each other;

 

Two channels measure the same displacement: two channels measure the same parameter, and compare the difference, if the difference is too large, the corresponding control treatment shall be conducted;

 

Two-channel compensation measurement: part of the parameter is measured by each channel, and the joint combination can complete the entire measurement;

 

Note: operation method for opening the combinational list box:

 

First click the pull-down arrow   on the right side of the box to display the list, and then single click the line to be selected, then the text box will display the selected content, the list is also closed. 

『Channel A (B) activation』

 

The radio button can select the instrument channel “work” or “not work”. First of all, the choice depends upon the instrument operation mode.

 

In 『Instrument operation mode』, select 3) or 4), Channel A, B must be selected as work.

 

In 『Instrument operation mode』, select 1), only one of the two channels can select work.

 

In 『Instrument operation mode』, select 2), the two channels can choose either work or bypass.

 

Bypass: the channel automatically fails and cannot monitor;

 

Work: the channel can perform monitoring;

 

Note: The operation method of the radio button:

 

Click the radio button    next to the content to be selected, so that it becomes   , that means it is selected.

 

『two channels monitor the same quantity, once one channel fails, the dual-channel becomes single channel to work』

 

Only in 『instrument operation mode』, when it is set as two channels measure the same parameter:

 

The instrument automatically switchover: i. e., the instrument distinguishes that a channel fails, it automatically becomes single channel measurement;

 

Manual Software programming measurement: i. e., the instrument determines that one channel fails, and cannot become a single channel measurement; but to enter the window, and set the 『instrument operation mode』 to single-channel operation, and bypass the fault channel, then download the parameters to the instrument.

 

『Channel A (B) basic setting』

 

Select the type of matching sensor based on the actual connected sensor: eddy current sensor or LVDT sensor;

 

Sensor sensitivity unit is generally default choice: V / mm.

Instrument indication unit is generally default choice: mm.

 

 

Channel A (B) setting

 

『Sensor parameters』

 

Enter or pull-down select the sensor probe, preamplifier, and extension cable model. For eddy current sensor model edit, under the system software main window “Option”, press “Eddy Current Sensor Model Edit” menu to create your own sensor model list;

The relationship between Negative voltage output characteristics, sensor output range, OK range, linear range and installation zero are shown as follows:

 

输出范围远端电压:

output range remote end voltage 

OK范围远端电压;

OK range remote end voltage 

线性范围远端电压;

linear range remote end voltage 

传感器安装零点电压:

sensor installation zero point voltage 

输出范围近端电压:

output range proximal voltage 

OK范围近端电压;

OK range proximal voltage 

线性范围近端电压;

linear range proximal voltage 

输出电压;

output voltage 

位移间距:

displacement spacing

 

The relationship between the sensor output range, OK range, linear range, installation zero point etc. of the sensors and positive voltage output characteristic sensor are the same as those in above figure, only the numerical symbol is “+” instead of “-“.

 

Particular statement: this software does not support sensors with bi-directional voltage (part of voltage output is “+”, another part is “-”) output characteristics. To obtain software for supporting such type of sensors, please specify before ordering.

 

Please firstly enter the sensor sensitivity:

 

If it is eddy current sensor, in 【sensor product verification data sheet】, least square fitting straight line equation is given: U = -4.002 × D +2.001, where -4.002 is the sensitivity of the sensor.

 

If it is LVDT sensor, generally fill: 0.3 V / mm or so, because the LVDT sensor is required to measure by the linearity correction mode, without demanding accurate data, the key point is that the symbol can not be “-”.

 

Note:

 

The symbol of sensor sensitivity must not be omitted or filled wrongly, because in the software, the symbol of other voltage values is taken from the symbol of the sensor sensitivity. 

 

Input the output range upper limit voltage and lower limit voltage of the sensor, usually directly select the default value;

 

For eddy current sensor, input the linear range remote end voltage and spacing, proximal voltage and spacing given in【sensor product verification data sheet】.

 

For LVDT sensor, after acquiring linearity data sheet of the sensor, the corresponding linear range remote end voltage and spacing, proximal voltage and spacing can be obtained.

 

『Measuring parameters』

 

Input upper limit value and lower limit value of the instrument range. Here it is emphasized that the upper limit value of the instrument range must be greater than the lower limit value.

 

  1. g.,: the upper limitvalue +5 mm, thelower limit value -5mm; upper limit value +35 mm, the lower limit value 0; upper limit value 0mm, the lower limit value -5mm; upper limit value -2mm, the lower limit value -5mm, etc. are all correct; but the upper limit value + 5mm, the lower limit value +10 mm; the upper limit value -10mm, the lower limit value -5mm are all wrong.

 

Channel measurement reference point (zero point) signal voltage must be accurate, there are two ways:

 

When the sensor is installed at the zero point position, press 〖acquisition〗 key, the instrument directly collects the sensor voltage, we generally recommend this approach;

 

Directly input the zero point voltage.

Channel measurement reference point (zero point) value in the ideal situation should be “0”, but actually the error may always exist, you can change this value to correct; if the channel measurement reference point (zero point) value is set to “0”, the correct channel measurement reference point (zero point) signal voltage has also been downloaded to the instrument; if the display value of the instrument is “-0.05”, we can set the channel measurement reference point (zero) value to “0.05”, then download the setting value to the instrument, then the display value of the instrument becomes “0.00”; Accordingly, if the display value of the instrument is “0.04”, we can set the channel measurement reference point (zero point) value to “-0.04” , and then download the setting value to the instrument, then the display value of the instrument turns to “0.00”. It is proposed that, generally, after other parameters are set correctly and sent to the instrument, the channel measurement reference point (zero point) value can be corrected.

 

『Measuring direction』

 

In actual monitoring, we must determine the direction of the monitoring indication (or the positive and negative definition of the value):

 

The measured surface away from the sensor probe end face is positive

 

The measured surface near the sensor probe end face is the positive end

 

 

 

探头Probe  被测体 measured object

 

  • 『探头安装角度』

『Probe mounting angle』

 

Typically, when the probe is installed vertical to the measured surface (parallel to the direction of displacement movement of the measured object), the measured value is the displacement of the movement of the measured object;

 

When the probe is installed not vertical to the measured surface (not parallel to the direction of displacement movement of the measured object), i. e., we often call that the bevel measurement, it is required to multiply a bevel compensation coefficient to the measured value, as shown in the following figure:

                

斜面补偿系数 =  实际运动位移  /  探头感应位移

                     = 1 / Sin α

 

 

Bevel compensation coefficient = (Displacement of the actual motion)L2/

(Inductive displacement of sensor probe)L1

= 1 / Sin α

『Sensor linear compensation』

 

There is always non-linearity in the displacement - voltage characteristics of the sensor, in order to improve the measuring accuracy, we often conduct linear compensation on the sensor characteristics. We can select the 『sensor linear compensation』 off or use as required (the corresponding sensor linearization tab is closed or open), but usually we recommend to use 『sensor linear compensation』, for the specific compensation method, see Sensor A (or B) linearity tab description.

 

『Safety Barrier configuration』

 

When sensors are installed in hazardous sites, in order to prevent explosion, usually a safety barrier is installed between the sensor and instrument; the voltage division of the safety barrier resistance will cause the difference between the sensor output and the instrument input, so it is required that instrument measured value is multiplied by a compensation factor. The determining method of the safety barrier compensation coefficient is usually that, in case of connecting a safety barrier, adjust the sensor output to 80% of the linear range, measure the sensor output voltage U1, and the instrument also measures the input voltage U2:

Compensation coefficient = U1 / U2

 

4.Sensor A (B) linearization

 

Only in Channel A (B) setting tab, and『sensor linear compensation』 is set to use, the following window can appear.

 

 

For any sensor displacement - voltage characteristics, we can perform polyline compensation up to 20 segments for it; 〖sensor displacement - voltage linearity correction table〗 can be obtained by the following method:

 

After the sensor is installed on site, input the displacement spacing of the measured points in displacement mm column in the table (from small to large, the value must be greater than zero, e. g., the displacement at the first point is 1mm, increase point by point), then adjust the sensor spacing to the displacement spacing of corresponding point, then move the mouse cursor to the voltage V column of corresponding point, and then press the 【acquisition】 key, the instrument will automatically acquire the voltage at the point.

 

For instance, in the window, we want to enter the corrected data of point 1, firstly input displacement 1mm in the first point displacement mm column; and then adjust the sensor spacing to 1mm; move the mouse cursor to point 1 in the voltage V column, press 【Acquisition】 key, the instrument will automatically acquire the voltage at the point and fill it in the column.

 

If an acquisition error occurs, re-collect the data.

 

Note: the re-entered data in the table will turn to red.

 

In the 〖Sensor displacement - voltage linearity correction table〗, the data in the displacement mm column and voltage V column must be from small to large, there shall be no vacancy in the middle;

 

If you do not need 21 points of corrected data, then all remaining points have to enter the corresponding data at the last correcting point.

 

Note: For thermal expansion and travel monitoring instruments for matching LVDT sensors, as signal conversion part is built-in in the instrument, in order to avoid too large measuring error, sensor linearity compensation mode must be adopted.

Channel A sensor displacement-      voltage linearity correction table

              acquisition                       draw compensation curve;

 

5./Output Setting 1

 

『Relay configuration』

 

DF Series monitoring instrument is equipped with four relays. We can configure the functions of four relays (serial number 1, 2, 3, 4) into the following categories as required:

 

When the instrument two channel operation mode is chosen as single-channel operation, dual-channel monitor the same quantity, dual-channel compensation measurement:

 

 

if the positive warning and negative warning share one warning relay, positive danger and negative danger share one danger relay, then Relay 1 is used as main warning relay and Relay 3 as backup warning relay, both act synchronously; Relay 2 is used as main danger relay and Relay 4 as standby danger relay, both act synchronously.

 

If the positive warning, negative warning, positive danger and negative danger independently uses a relay, then Relay 1 will be used as positive warning relay, Relay 2 as negative warning relay, Relay 3 as the positive danger relay and Relay 4 as the negative danger relay.

 

When the two-channel instrument operation mode is chosen as the dual-channel independent measurement mode:

 

Relay 1 for Channel A warning relay, Relay 2 for Channel A danger relay, Relay 3 for Channel B warning relay and Relay 4 s for Channel B danger relay.

 

『Warning relay』 and 『danger relay』 can be set to interlock---- put into use, actuation in case of overruning; or set to disarm ---- exit unused, no action when overrunning.

 

『Alarm LED indication memory』

 

Alarm LED lamp can be set to remember ---- when warning, danger overrun alarms, the corresponding alarm LED indicator lights, and is locked, in case of warning and danger overrun state exits, it will not go out until the alarm reset button is pressed (see the monitoring instrument operation Guide), thus it is easy to analyze the fault;

 

Or set to not remember ---- in case of warning, danger overrun alarms, the corresponding alarm LED indicator lights, the warning, danger state exits, the corresponding alarm LED lamp goes out.

 

『Relay action memory』

 

Relays can be set to memory ---- in case of warning and danger over-run alarms, the corresponding relay acts, and is locked and held, the warning, danger overrun state exits, the relay does not resume until the alarm reset button is pressed (see the monitoring instrument operation guide);

 

Or set to no memory ---- in case of warning, danger over-run alarms, the corresponding relay acts, the warning and danger overrun state exits, the corresponding relay resumes.

『dual channel warning control logic』

 

When the dual-channel monitors the same quantity, warning overrun signaling (LED indicator lights and the relay acts) control logic can be set to:

“or” logic---- in case of either channel warning overrun, the warning LED indicator lights and the warning relay acts;

“and” logic---- only when two channel warning both overruns, the warning LED indicator will light, and the warning relay will act.

 

『Dual-channel danger control logic』

When dual-channel monitors the same quantity, the danger overrun signaling (LED indicator lights, and the relay acts) control logic can be set to:

 

“or” logic---- in case of either channel danger overrun, the danger LED indicator lights, and the danger relay acts;

“and” logic---- only when two channels are both danger overrun, the danger warning LED indicator will light, and the danger relay will act.

『Difference value overrun』

When dual-channel monitors the same quantity, you can set the difference overrun value between the two channels; when the difference value overruns, you can choose:

 

Warning relay action ---- Relay 1 acts, and sends out warning signal;

Warning relay no action

 

『Difference value overrun』

When dual-channel monitors the same quantity, you can set the difference overrun value between the two channels; when the difference value is overrun, you can choose:

Bypass danger relay ---- the danger relay is locked and can not act;

Not bypass danger relay ---- the danger relay is not locked, when danger overruns, it can normally acts.

      /Output setting 2

『Current output』

Current output can choose: 4-20mA or 0-10mA. Instrument automatic conversion output.

 

『Voltage output』

 

Voltage output can choose: 1-5V or 0-10V. Instrument automatic conversion output.

 

『Channel A control limits』

 

Can input the OK limit, warning and danger limit of Channel A; when a warning or danger limit is not used, you must enter a certain value that cannot be achieved so as to ensure that no false signal will be sent out.

 

OK limits can refer to the upper and lower limits of the sensor output voltage, the scope can be slightly larger than the sensor output voltage of the upper and lower limits.

 

The absolute value of danger limit in the same direction (both positive or both negative) must be higher than the absolute value of the warning limit.

 

『Channel B control limits』

 

Can input the OK limit, warning and danger limit of Channel B; when a warning or danger limit is not used, you must enter a certain value that cannot be achieved so as to ensure that no false signal will be sent out.

 

When dual-channel monitors the same quantity, OK limit, warning and danger limit of Channel B are the same as those of Channel A.

 

The positive warning, positive danger, negative warning, negative danger of Channel A and B can be chosen via the left check button:

 

Selected

 

If the alarm function is set, when reaching the setting limit, the corresponding alarm signal can be sent out;

 

Not selected    

 

If the alarm function is canceled, the setting limit will automatically be set to the corresponding range limit, and the corresponding alarm signal can not be sent out.

 

『Instrument output control parameter』 

 

The instrument warning, danger signaling delay and dual-channel difference value limit, alarm hysteresis can be inputted.

 

Alarm hysteresis: refers to that after the instrument measured value exceeds warning or danger limit and alarms, LED lights, the relay acts; if at this time the instrument measured value returns to below the warning or danger limit, and cannot immediately withdraw from a warning or danger warning, but must reach a measured value that is below the limit but the difference is the specified alarm hysteresis, then exit the alarm or danger warning state.

 

The dimension of the alarm hysteresis is the lowest digit of the measured display value. For example:

 

The instrument indication is 1.34mm, the alarm hysteresis is set to 5, then the actual alarm hysteresis is 0.05mm;

 

If the instrument positive warning value is 1.3mm, then the instrument will alarm; if the measured value decreases to 1.29mm and cannot withdraw from the alarm, but it must be below 1.25mm, it can exit from alarm state;

 

The instrument indication is -13.4mm, the alarm hysteresis is set to 5, then the actual alarm hysteresis is 0.5mm.

If the instrument negative warning value is -13.0mm, then the instrument will alarm; if the measured value decreases to -12.9mm and cannot exit alarm, but it must be below -12.5mm, it can exit from alarm state;

Warning (danger) signaling delay: refers to that after the instrument measured value (displayed value) exceeds the warning or danger limit, the time for always maintaining the measured value (display value) exceeds the set time limit, then warning or danger signals are sent out;

Difference value limit: when the two channels measure the same quantity, the maximum allowable deviation of measured values; if the deviation of two channels is over the limit, an alarm will be sent out or bypass the danger relay according to the setting.

Change rate limit: In general, axial displacement, relative expansion, travel and thermal expansion are all slow variables which will not abruptly change; a maximum possible rate of change can be obtained by experience, when the change rate of the measured value exceeds this limit, it will send out the alarm or bypass the danger relay. (This function is temporarily not available).

7. Save and print setting parameters

 

After the parameter is set up, click “OK” to store the changes made to the parameter setting file, and close the setting option window, return to the main interface, meanwhile the “test” and “application” in “configuration” menu will become effective.

 

Click “Cancel” to cancel the changed settings made and close the setting option window, then return to the main interface.

If there is some error in the setting parameters, click the “OK” button will pop the prompt:

DF9000 Programmable TSI Instruments configuration software

Parameter setting error, please correct it!

Click “OK” will return to “Parameter Setting” window, it can be found that, the wrong setting parameters turn into red. Common errors are: upper and lower limit, warning and danger limit, OK range setting incorrectly.

Error must be corrected, then click “OK” to save the changes into the parameter setting file.

To print the contents of tabs, simply switch to the appropriate tab and press “Print Screen” button to directly hard copy the tab.