Setup Examples. Thermocouple Card Configuration

Transcription

1 etup Examples Thermocouple Card Configuration

2 Thermocouple Card Configuration Examples 2005, 2006 RTP Corporation Not for reproduction in any printed or electronic media without express written consent from RTP Corp. All information, data, graphics and statements in this document are proprietary intellectual property of RTP Corp. unless otherwise indicated and are to be considered RTP Corp. confidential. This intellectual property is made available solely for the direct use of potential or licensed RTP Corp. customers in their application of RTP Corp. products, and any other use or distribution is expressly prohibited. If you have received this publication in error, immediately delete, discard or return all copies to RTP Corp. RTP Corporation 1834 W 2 nd treet Pompano Beach, F Phone: (954) Fax: (954) Internet: File Name: Thermocouple Examples.pdf ast Updated: 10/16/06 2

3 Thermocouple Card Configuration This document provides two examples to help you understand the configuration of thermocouple inputs. The hardware required to complete these examples include an 8707/00 8-Channel Thermocouple card and two -Type thermocouples. If thermocouples are not available, you may substitute four short lengths of wire for the verification test. ardware etup Examine the Thermocouple card and locate Jumper J1/P1. In this example, we will be using the card s on-board CJC sensor. Make sure that Jumper J1 is positioned over pins three through 6 as indicated in the figure. (owever, if your particular installation is using the 8514/07 Thermocouple Termination Module, re-position the jumper over pins 1 through 4 to select the external CJC sensor on the Termination Module.) C 0 C 1 C 2 TB1 C 3 C 4 C 5 C 6 C 7 TB CJC elect Jumper R65 1-3, 2-4 External 3-5, 4-6 On-board J1/P External CJC External CJC TB On-board CJC Connect the leads of one thermocouple to the Channel 0 inputs on card s front panel terminal block TB1; connect the leads of the second thermocouple to the Channel 1 inputs of TB1. Tighten the retaining screws. If you are not using thermocouples, connect one jumper wire between the hield and igh terminals of Channel 0, and another jumper wire between the igh and ow terminals of Channel 0. ikewise, connect the Channel 1 s hield, igh, and ow input terminals together with two wires. TB1 ignal 1 Channel 0 hield 2 Channel 0 igh 3 Channel 0 ow 4 Channel 1 hield 5 Channel 1 igh 6 Channel 1 ow Turn the Rack power supply off (0). Insert the Thermocouple card into lot 0. 3

4 Example 1 The physical I/O configuration of this example consists of one 8-Channel canning Thermocouple card (model number 8707/00) installed in a Viking2300 Rack 00, lot 00. One -Type thermocouple is connected to channel 0 of the card, which will be measuring temperatures between 0 and 300 degrees Celsius. We want to take advantage of the card s Open Transducer Detection (OTD) feature and perform these tests at regular intervals. On your PC, press tart and select Programs RTP Netuite NetArrays. Click on the I/O Configuration tudio button in the NetArrays main toolbar. Maximize the I/O Configuration form. Drag the Viking2300 Node icon from the I/O Toolbox to the Node 00=Empty position on the I/O Configuration form. Drag the Viking2300 Rack icon from the I/O Toolbox to the Rack 00=Empty position on the I/O Configuration form. Note that the I/O Configuration form must match the physical I/O rack installation. If your installation differs from this example, adjust the icons on the I/O Configuration form accordingly. Drag Node ere Drag Rack ere In the I/O Configuration form, expand the Rack branch by clicking on the. Open the box of RTP Analog Cards by clicking on the. Drag and drop a canning Thermocouple card icon into the rack and slot occupied by the Thermocouple card. (For this example we used Rack 00 lot 00.) 4

5 Click ere Drag Card ere Right-click on the card s icon to display the menu and select Properties to open the card s Property Manager window. elect Properties The upper portion of the Property Manager contains the Card Properties and the lower portion contains the individual I/O Channel Properties. We will configure the card properties first. 5

6 elect Card s Dash Number elect an OTD Method Disable Float CJC Variable Assign a Tag to the Float ensor Input Assign Tags to the Calibration Inputs Assign a Tag to the Error Detection Input Disable the Demand OTD Trigger output Assign a Tag to the OTD tatus input Card Properties The Redundant Card ID parameter will remain at the default setting of 0 because the inputs of the card is not connected in a parallel redundant manner. The Dash Number parameter determines how often the card is accessed by the Chassis Processor card. elect 003 or 001 to match the actual dash number (i.e., the last three digits of the card s model number) of the Thermocouple card installed. OTD Method determines if OTD tests are performed at regular intervals or only when commanded by the project program. elect Fixed Interval(equential) to initiate tests at the rate specified in the channel s OTD Interval column. Because we will be using the card s CJC ensor as the CJC temperature source, the CJC Constant (Card) parameter will not be used. kip to the next parameter. Because we will be using the card s CJC ensor as the CJC temperature source, the Float CJC Variable variable will not be used. Disable it by selecting False for the Enabled parameter. To access the card s CJC ensor temperature in the project program, assign a Tag to the Float ensor Input variable. The Tag chosen is Thermo1_CJC. 6

7 To access the card s fixed-gain calibration voltage input in the project program, assign a Tag to the Float Cal igh Input (Fixed Gain) variable. The Tag chosen is Thermo1_Cal_Fix. The returned voltage should be 9.0 volts. To access the card s variable-gain calibration voltage input in the project program, assign a Tag to the Float Cal igh Input (Var. Gain) variable. The Tag chosen is Thermo1_Cal_Var. The returned voltage should sequence through the values 1.125, 2.25, 4.5 and 9.0 volts. A Tag must be assigned to the Integer Error Detection variable to access the card s Error Detection status input. The Tag chosen is Thermo1_Error. Because we will be using fixed-interval OTD tests, the Integer Demand OTD Trigger variable will not be used. Disable it by selecting False for the Enabled parameter. A Tag must be assigned to the Integer OTD tatus variable to access the card s OTD tatus input. The Tag chosen is T1_OTD_tatus. That completes the Card Properties configuration. Now we will configure the I/O Channel Properties. Assign a Tag elect a Enter a elect a to the Channel Gain Filter Weight Thermocouple Type Disable Unused Enable OTD Tests Enter an OTD elect a CJC Channels and Assign a Tag Test Interval Temperature ource I/O Channel Properties In this example, only Channel Input 00 is connected to a thermocouple, and Input 01 through Input 07 are unused. eave Input 00 at the default setting of Float. elect Disabled for all other input channels. An I/O Tag must be assigned to the input channel to access the measured temperature in the project program. The Tag chosen is Thermo1_0 for Thermocouple card number 1, Channel 0. elect a Gain that provides the highest resolution for the temperatures being measured. To determine this, refer to the Thermocouple Type table in the NetArrays elp, or in the NetArrays I/O Card Configuration Properties Reference Manual. A copy of this table is on the next page. 7

8 Type Gain = 1024 Gain = 512 Gain = 256 Gain = 128 J 210 to 181 C 210 to 358 C 210 to 698 C 210 to 760 C K 270 to 240 C 270 to 473 C 270 to 943 C 270 to 1372 C E 255 to 149 C 270 to 280 C 270 to 525 C 270 to 1000 C N 270 to 311 C 270 to 572 C 270 to 1073 C 270 to 1300 C R 0 to 943 C 0 to 1649 C 0 to 1768 C T 270 to 208 C 270 to 378 C 270 to 400 C 0 to 1015 C 0 to 1768 C B 42 to 1471 C 42 to 1820 C In the table, locate the row corresponding to the Type thermocouple device connected to the input channel. Then find the gain column that provides the highest gain that includes the entire temperature range that you expect to measure (0 to 300 C). For this example, the table indicates a gain of In the Gain column of the I/O Channel Properties, select a gain of A cale factor will not be used. eave this entry at the default setting (1.0). A hift factor will not be used. eave this entry at the default setting (0.0). To enable the Filter, enter a recursive filter weight. A relatively fast filter was created by entering a value of 100. The selection in the Type column must match the type of thermocouple connected to the input channel. In this example, an -Type thermocouple is employed. The checkbox in the OTD Tag column must be checked to allow OTD test for the channel. Enter a Tag for the variable that will enable or disable OTD tests. (When the variable is True OTD tests are enabled; when False they are disabled.) The Tag OTD_Enab was entered for this variable. Because fixed interval OTD testing will be used, an OTD Interval for this channel must be entered in this column. An interval of 2 minutes is specified. Because the card s CJC sensor will be used as the source of the CJC temperature, you must select either ensor or ensor Filtered in the CJC column. We chose not to add filtering to the CJC ensor input. This completes the configuration of Channel 0 of the Thermocouple card. 8

9 Example 2 In this example, a second -Type thermocouple is connected to channel 1 of the card, which will be measuring temperatures as high as 1500 degrees Celsius. OTD testing will also be enabled for this channel. The Card Properties have already been configured, we will move right to the I/O Channel Properties Assign a Tag elect a Enter a elect a to the Channel Gain Filter Weight Thermocouple Type Enable Enable OTD Tests Enter an OTD elect a CJC Channel 1 and Assign a Tag Test Interval Temperature ource I/O Channel Properties Change Channel Input 01 from Disabled to Float. The I/O Tag Thermo1_1 for Thermocouple card number 1, Channel 1 is assigned to the input channel. We return to the table to determine the Gain. Because the maximum temperature will be 1500 C, a gain of 512 is required for this channel. (The maximum temperature that can be measured at a gain of 1024 is 1015 C; therefore, a lower gain must be used.) Enter 512 into the Gain column. Type Gain = 1024 Gain = 512 Gain = 256 Gain = 128 J 210 to 181 C 210 to 358 C 210 to 698 C 210 to 760 C K 270 to 240 C 270 to 473 C 270 to 943 C 270 to 1372 C E 255 to 149 C 270 to 280 C 270 to 525 C 270 to 1000 C N 270 to 311 C 270 to 572 C 270 to 1073 C 270 to 1300 C R 0 to 943 C 0 to 1649 C 0 to 1768 C T 270 to 208 C 270 to 378 C 270 to 400 C 0 to 1015 C 0 to 1768 C B 42 to 1471 C 42 to 1820 C A cale factor will not be used. eave this entry at the default setting (1.0). A hift factor will not be used. eave this entry at the default setting (0.0). A Filter weight of 250 was entered to provide additional filtering. elect as the thermocouple Type. A single Bool variable will be used to enable OTD testing for both channels. In the OTD Tag column select the Tag OTD_Enab. 9

10 An OTD Interval of 3 minutes was entered for this channel. ensor was chosen as the source of the CJC temperature. Both Channel 0 and Channel 1 of the Thermocouple card are now configured. Verification Now that the I/O configuration is completed, we will now add some logic the project program to test our configuration. Turn the Rack power supply on (1). ave the project. From the NetArrays File menu select ave New Project As and assign a name to the project. witch to Module Form MForm1 by clicking on the MForm1 icon in the Project Explorer pane. Add the objects as indicated in the following figure. Assign Tag names in the object properties as indicated. The temperatures measured by the two channels on the Thermocouple card are accessed in NetArrays by two Float Variable objects with the Tags Thermo1_0 and Thermo1_1. A Float Variable object with the Tag Thermo1_CJC accesses the temperature measured by the card s CJC sensor Channel 0 temperature input Channel 1 temperature input CJC ensor temperature input The card s Error Detection and OTD tatus are access by Int Variable objects assigned the Tags Thermo1_Error and T1_OTD_tatus. The bits in these status inputs can be decoded using Bit Variable objects with the same Tags and selecting the appropriate Bit in the Property Manager to identify the specific error condition. Card Error Detection input elect Bit 0 for Card Timeout elect Bit 3 for Calibration igh Error 10

11 Card OTD tatus input elect Bit 0 for Channel 0 elect Bit 1 for Channel 1 Enable OTD Testing After adding and assigning Tags to these objects, save the project program. Then select the target node containing the Thermocouple card from the Device elect menu. Run the project in Debug mode by clicking on the Run button in the Main Toolbar. Observe that the Thermo1_Error status variable equals zero. Observe that all the temperatures reported by Thermo1_0 and Thermo1_1 variables are approximately the same as the CJC temperature at variable Thermo1_CJC. Force the value of the OTD_Enable variable to True to enable OTD testing on the two channels (move the curser over the object s output indicator and click the left mouse button). The Thermo1_Error and T1_OTD_tatus variables should remain at zero. Remove terminal block TB1 from the front panel connector on the Thermocouple card to simulate open thermocouples. In a few moments the T1_OTD_tatus variable will change to a 1 and the T1_0_OTD_Fail flag will change to True when Channel 0 fails the OTD test. A little later the T1_OTD_tatus variable will change to a 3 and the T1_1_OTD_Fail flag will change to True indicating that Channel 1 also failed the OTD test. Replacing terminal block TB1 will clear the OTD error indications during the next test cycle. Congratulations! You have successfully completed the configuration of a Thermocouple card. Additional Notes The 8514/16 Triple Redundant Thermocouple Termination Module contains brass terminals inserted into an aluminum plate that is enclosed in an insulated aluminum cover. This provides uniform temperature reference point for the thermocouple wiring terminations. If you are not using an 8514/16 Thermocouple Termination Module, and are connecting the thermocouple wires directly to the terminal blocks on the front panel of the Thermocouple Card, you must cover these input connections with an electrically nonconductive thermal insulation material. If these inputs are not properly insulated, the input temperature will differ from channel to channel. 11