ABB 266 MODBUS User Manual Download Page 1

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2105216 Rev. AB

The most accurate
multivariable transmitter
ABB has ever produced

User manual

2600T series pressure transmitters

266 MODBUS

multivariable transmitter

Summary of Contents for 266 MODBUS

Page 1: ...2105216 Rev AB The most accurate multivariable transmitter ABB has ever produced User manual 2600T series pressure transmitters 266 MODBUS multivariable transmitter ...

Page 2: ...ds 4 Transmitter dimensions 4 Transmitter hardware subassemblies 6 Transmitter operational specifications 7 Power requirements 8 Input output specifications 9 User interface 14 3 Installation 16 Site planning and preparation 16 Unpacking inspection and verification 17 Mounting options 19 Housing and display orientation 23 RTD installation 25 Electrical connections 28 4 Transmitter start up 33 Supp...

Page 3: ... block 54 Adjusting the LCD screen contrast 56 Replacing the RTD probe 57 RTD wiring verification 58 Removing the transmitter from service 58 Calibrating 59 Setting the measurement bias 65 Resetting the transmitter to factory defaults 69 6 Troubleshooting 70 Diagnostic codes 70 Blank display screen 73 Communication failure 76 Customer service and support 78 Appendix A HMI menu structure 79 Appendi...

Page 4: ...Liquid level in a closed tank wet leg 97 Appendix E Hazardous area ratings and considerations 98 E 1 Ex Explosion protection aspects Europe and International 98 E 2 Ex Explosion protection aspects United States and Canada 101 Appendix F Approvals and certifications 103 F 1 USA Explosion Proof 103 F 2 USA Non Incendive 107 F 3 Canada Explosion Proof 113 F 4 Canada Non Incendive 117 F 5 IECEx Flame ...

Page 5: ...5 Figure 21 RTD probe wiring to explosion proof head wiring block 26 Figure 22 RTD wiring to transmitter 26 Figure 23 RTD probe 27 Figure 24 Ground connections 28 Figure 25 Housing covers and cable entry points 30 Figure 26 RTD Simulation wiring 31 Figure 27 Termination block showing RTD communication and electrical connections 32 Figure 28 Display operating properly 33 Figure 29 HMI navigation 34...

Page 6: ...ansmitter specifications 7 Table 3 Differential pressure specifications 9 Table 4 Static pressure specifications 9 Table 5 RTD input specifications 10 Table 6 RTD element errors 10 Table 7 MODBUS RTU message frame format 11 Table 8 Bit sequence in RTU mode with parity checking 13 Table 9 Bit sequence in RTU mode with no parity 13 Table 10 Pre installation checklist 16 Table 11 Model number configu...

Page 7: ...icates that the following item is an additional menu selection Use the key pad to locate and select Calibrate Diff Press Sensor Calibration Units Edit Menu item names in instructions Bold text and the capitalization of names agrees with the names as displayed on the HMI menu Use the right soft key to enter the Main Menu Programs including utility and accessory programs Title capitalization Microso...

Page 8: ...er manual 2101226 XSeriesG4 flow computer user manual 2103335 XSeriesG4 remote controller user manual 2103334 TFIO Comm Interface Module 2100421 to transmitter MODBUS w RTD user drawing 2102345 Transmitter pipe mount bracket user drawing 2104265 XFC G4 Com2 ABB267 269 and ABB266 user drawing 2102118 XFC G4 Com2 IMV25 and ABB266 user drawing 2105115 XFC G4 EX Com2 ABB267 269 and ABB266 user drawing...

Page 9: ... health risk to life This symbol in conjunction with the signal word DANGER indicates an imminent electrical hazard Failure to observe this safety information will result in death or severe injury The text may state the hazard how to avoid the hazard and what the result would be if not followed WARNING Bodily injury This symbol in conjunction with the signal word WARNING indicates a potentially da...

Page 10: ...ters The material of the Sensor Diaphragm Flanges and Gaskets selected at the time the pressure transmitter order was placed must be compatible with the environment and process fluids that may be present at the installation location The environment and process fluids must not adversely affect the materials of the equipment construction The enclosure contains either aluminum or stainless steel whic...

Page 11: ...n external RTD once every second The differential pressure measuring ranges are scaled from 6 2 to 1993 mbar 2 5 to 800 inH2 O The measuring ranges for static pressure are 0 to 210 bar 0 to 3046 PSI The unit transmits a digital output signal utilizing RTU MODBUS communication protocol and is able to co exist with an existing ABB 267 269CS multivariable transmitter on the same RS 485 communications...

Page 12: ...available upon request during the warranty period of the transmitter A separate report for the differential pressure and the static pressure are also included The following factory calibration data is kept for all units Calibration data consisting of 5 points for each pressure sensor Proof data consisting of 12 points for each pressure sensor Transmitter dimensions Figure 2 and Figure 3 provide th...

Page 13: ...l 2105216 Rev AB 5 Figure 3 266 Vertical flange transmitter dimensions 3 58 in 91 mm 5 65 in 144 mm 1 22 in 31 mm 4 82 in 122 mm 2 64 in 67 mm 8 51 in 216 mm 2 30 in 58 mm 0 69 in 18 mm 0 35 in 9 mm 4 48 in 113 mm 2 18 in 55 mm 1 04 in 26 mm 0 69 in 18 mm 2 30 in 58 mm ...

Page 14: ...settings HMI 6 pin connector Provides connection between the meter LCD assembly and electronics module Housing sensor and flange The housing protects the transmitter components from environmental conditions and also provides an explosion proof rating for the unit The housing includes two NPT entry points for field wiring and a nameplate which states the product ID and the unit serial number The se...

Page 15: ... conducted Immunity Meets or exceeds EN61326 1 Criteria A for ESD 8 kV 6 kV RFI 10 V m EFT 2 kV Lightening surge 2 kV 1 kV Cond 10 Vrms Mag 100 A m Low voltage directive Meets 73 23 EC Certifications Explosion proof Class I Div 1 Groups A B C D T5 Ta 50 C to 85 C Canada Class I Div 1 Groups B C D T5 approved Div 1 RTD available Flame proof US and CA Class I Zone 1 A Ex d IIC T4 Dust ignition proof...

Page 16: ... Rev AB Power requirements The supply voltage required range is 10 5 to 30 Vdc For current draw requirements see Figure 5 For power consumption based on specific supply voltages see Figure 6 Figure 5 Supply current chart Supply Voltage Vdc Power mW Figure 6 Power consumption chart ...

Page 17: ... to 185 F 0 04 of FCS 5 0 02 of reading Static pressure effect SPE to DP span Up to 1450 PSI 0 02 of reading 1450 PSI 0 02 of reading per 1450 PSI Vibration effect 1 5 InH2 O 3 74 mbar according to IEC 61298 3 Field with general application or pipeline with low vibration Static pressure input The transmitter includes a static pressure input The specifications are documented in Table 4 Table 4 Stat...

Page 18: ...culation table for RTD element errors is documented in Table 6 Table 5 RTD input specifications6 Item Description Accuracy7 0 27 F Typical 0 65 F Maximum Over operating range of 54 F to 765 F Measurement range 80 F to 1500 F Table 6 RTD element errors8 Tolerance class Temperature range of validity C Wire wound elements Film elements Tolerance Values9 C AA 50 to 250 0 to 150 0 1 0 0017 t A 100 to 4...

Page 19: ...ial line specification and implementation guide V1 0 published by modbus org MODBUS uses a master slave communications concept Slave transmitters respond only to requests made by the master Each slave is identified by an unsigned one byte number ranging from 1 to 247 inclusive A slave sends a single response to a master s request for data Table 7 The packet field consists of the MODBUS packet sent...

Page 20: ...ister tables Mapping tables assign 16 bit system objects to 32 bit register addresses This allows the MODBUS Master to select and use a single addressing mode The MODBUS processor zero fills any undefined 16 bit objects The defined bits occupy the LSB least significant lower bits and the zeroed bits are the MSB most significant higher bits A 32 bit register address is mapped the same way as a sing...

Page 21: ...p bits Figure 8 depicts a typical MODBUS message format Start End 3 5 char 3 5 char Address 8 bits CRC Check 16 bits Data N x 8 bits Function 8 bits MODBUS message At least 3 5 char Frame 1 Frame 2 Frame 3 At least 3 5 char 3 5 char 4 5 char Where Start Indicates the quiet time before a data transfer Address In the request frame this is the device being addressed In the response frame this is the ...

Page 22: ...ing normal operation the operation screen Figure 9 provides current values and operational information from the transmitter Figure 9 Operation screen Operator Page 1 HMI keypad The local LCD display Figure 10 is used to access the configuration and management menus The left and right soft keys Items 1 and 3 allow users to perform the selected action which is displayed immediately above the soft ke...

Page 23: ...ns in the menu tree Operation screen Operator Page 1 Operator menu left soft key Main menu right soft key Device Setup Display Calibrate Diagnostics Device Info Communication Return to Operator Page 1 Signals View Diagnostics Easy Setup down soft key down soft key Figure 11 HMI menu tree hierarchy For more information about submenus go to Appendix A HMI menu structure ...

Page 24: ...andards for the 266 MODBUS multivariable Transmitter identification Verify the transmitter received has the proper range Process connections Verify all process connection equipment is correct for the installation Mounting Verify that all necessary mounting hardware is available for the desired mounting of the transmitter Tools required Acquire the tools needed for installation once the hardware is...

Page 25: ...information found on the packing slip and in section 3 2 2 Product model identification for verification The figure shows a transmitter with a typical barrel housing configuration Nameplate A This nameplate provides the model number maximum working pressure range and span limits power supply output signal diaphragm material filling fluid and serial number Nameplate B The certification nameplate is...

Page 26: ...ate A The 18 digit model number identifies each characteristic or pick code of that transmitter based on the position of the digit and the value of those digits Table 11 describes the pick code and identifies which pick codes are configurable Table 11 Model number configuration Position Description Configurable Digits 1 5 Product family model measurement type construction and application No Digit ...

Page 27: ...ct mount installation The following steps detail the procedures for direct mounting the transmitter onto the meter run horizontally or vertically Horizontal flange transmitter direct mount instructions To direct mount the assembly horizontally 1 Determine where the transmitter is to be placed on the meter run so that the high side is upstream Figure 13 266JSH JST RTD Manifold Meter run Figure 13 H...

Page 28: ...meter run so that the high side is upstream Figure 14 266 multivariable transmitter RTD Meter run Manifold Figure 14 Vertical flange assembly direct mount for illustrative purposes only 2 Align the sealing rings and bolt holes then bolt the transmitter to the manifold 3 Screw the risers into the flange taps on the meter run 4 Attach the manifold and transmitter assembly to the risers and secure Th...

Page 29: ...transmitter is to be positioned on the meter run so that the high side is upstream IMPORTANT NOTE Select a location that allows easy user access and is close to the equipment 2 Position the pipe saddle on the meter run Figure 15 Saddle 2 x 40 Mounting pipe Meter run Mounting U bolt Figure 15 Pipe saddle assembly a Temporarily attach the pipe saddle on the meter run using a U bolt and associated ha...

Page 30: ...les between the manifold and the transmitter Bolt the transmitter to the manifold 5 Attach the transmitter to the underside of the bracket using four bolts Figure 17 266 Multivarible transmitter Bracket Meter run Manifold Figure 17 Horizontal flange assembly pipe mounted 6 Connect the manifold tubing to the orifice fitting Mounting is now complete IMPORTANT NOTE To rotate the housing and display f...

Page 31: ... be rotated up to 360 Transmitter housing rotation To rotate the transmitter housing 1 Unscrew the housing stop screw approximately one rotation do not remove the screw IMPORTANT NOTE A stop prevents the housing from being turned too far 2 Rotate the 266 transmitter to the desired position 3 Retighten the screw once the desired position has been reached Figure 18 Figure 18 Transmitter housing rota...

Page 32: ...for any hazardous conditions 2 Disengage the four 4 fixing locks by pressing in on each one with a small slotted screwdriver Figure 19 Figure 19 Display rotation 3 Pull the display housing out from the communication board 4 Reposition the LCD connector to the new desired position 5 Push the LCD module back onto the communication board IMPORTANT NOTE Ensure that the four plastic fixing locks are pr...

Page 33: ...ocedure To avoid creating a hazardous situation ensure compliance with the applicable standards regulations and recommendations for installation in the country of use RTD installation in classified DIV 1 areas should only be performed by technicians knowledgeable about explosion protection Explosion proof and flame proof installations require explosion proof conduit and poured seals or flame proof...

Page 34: ...n 8 Tighten all conduit and fittings to wrench tight 9 Wire the RTD probe wiring to the wiring block located inside of the explosion proof head assembly Figure 21 Figure 21 RTD probe wiring to explosion proof head wiring block 10 Remove the shipping plug from the transmitter housing 11 Remove the rear housing cover from transmitter if not already removed go to section 5 2 Transmitter hardware secu...

Page 35: ...ector into the thermowell 5 Remove the shipping plug from the transmitter housing 6 Remove the rear housing cover from transmitter if not already removed go to section 5 2 Transmitter hardware security for additional instructions 7 Run the RTD cable along the side of the process stream pipeline in a straight line Use nylon tie wraps to secure the cable to the pipeline Do not wrap the RTD cable aro...

Page 36: ... In order to fulfill the requirements of the low voltage guidelines and the relevant EN 61010 rules for the installation of electrical equipment the housing must be provided with a protective circuit for example grounding or protective conductor if voltages greater than 150 Vdc could occur Integrated surge protector The 266 MODBUS transmitter terminal block includes transient suppression circuitry...

Page 37: ...some cases beyond repair due to electrostatic discharge Consider the following during electrical installation The existing supply voltage corresponds to that indicated on the name plate The electrical connection is made via the cable entry 1 2 14 NPT port optional M20 X 1 5 Appropriate conduit or cable glands must be selected for the application The cable gland must be screwed into the housing usi...

Page 38: ...plosion Before removing the wiring cover rear housing cover disconnect the equipment from the supply voltage and take suitable measures to prevent reconnection Explosion proof and flame proof installations require explosion proof conduit and poured seals or flame proof rated cable and cable glands respectively Figure 25 Housing covers and cable entry points The transmitter requires a supply voltag...

Page 39: ... 26 RTD Simulation wiring b Loosen the terminal 1 screw and remove the jumper wire c Loosen the terminal 4 screw and remove the jumper wire IMPORTANT NOTE For the purpose of temperature simulation a 178 Ω resistor 206 C 402 8 F with 2 jumpers has been installed between the terminals for the temperature RTD connection This resistor including the jumpers in the case of 4 wire connections must be rem...

Page 40: ...e gland or cord grip housing single or dual wire and into the cable entry if not already completed IMPORTANT NOTE If power and communications are not in the same cable an adapter can be purchased that will allow two 2 cables to be located in the same cable gland or cord grip housing 6 Connect the power wire to the PWR terminal 7 Connect the power wire to the PWR terminal 8 Connect RS 485 A to COMM...

Page 41: ...tmosphere is not present when before applying power with the housing covers removed The following sections discuss in detail the requirements to complete a successful startup Section 4 1 Supplying power Section 4 2 Configuring the transmitter Section 4 3 Commissioning the transmitter Section 4 4 Software configuration security optional Supplying power 1 Apply 10 5 to 30 Vdc power to the transmitte...

Page 42: ...OTE To navigate the menu submenu and available selections listed on a screen the up soft key will take you to the end of the selections list When navigating to the last item of a list it is faster to use the up soft key to jump to the end of the list versus using the down soft key to move through the entire list of selections to reach the end or nearly the end Throughout this document HMI navigati...

Page 43: ...ss to setting the measurement units upper and lower range values and display screen selections Figure 30 Easy Setup menu Language Tag Address Diff Pressure Unit Diff Pressure LRV Diff Pressure URV Diff Pressure Damping Static Pressure Unit Static Pressure LRV Static Pressure URV Static Pressure Damping Process Temp Unit Process Temp LRV Process Temp URV Process Temp Damping Display Line 1 View Dis...

Page 44: ...t soft key to access the HMI menu 2 Use the key pad to locate and select Communication 3 View each parameter setting by selecting each submenu item and viewing the setting 4 Edit each parameter shown in Table 12 if necessary to configure communication for the site s specific requirements a To edit a specific parameter press Edit and change the parameter b Locate the appropriate selection and selec...

Page 45: ...ply transfer the wiring from the existing unit to the 266 MODBUS device Using any of the methods listed in section 4 3 1 1 Set MODBUS device address set the MODBUS address to the same address as the device being replaced and communication should immediately be available No further action is required In new installations setup and validation can still be a simple task if the communication and suppl...

Page 46: ...answer and the communication timed out The Master did not change the device address leaving the device without a Transducer ID or an identification on the bus The Slave replied with a negative acknowledgement NACK and the device address did not change The Master could not reassign the device address because the device address already exists but does not match the Transducer ID of the device Reassi...

Page 47: ...nly Before validating the transmitter measurement system all tube connections should be leak tested and leak free The following procedure provides instructions for leak testing a 3 valve manifold If another type of manifold is used adjust this procedure accordingly 1 Verify that the equalizer valves Figure 33 items A and B are open and the manifold vent valve is closed item C 2 Apply pressure to t...

Page 48: ...items A and B 3 Vent the high and low side of the manifold to atmosphere by opening the manifold vent valve item C 4 Verify the static pressure reading is equal to the barometric pressure 5 Close the manifold vent valve item C IMPORTANT NOTE When validating the static pressure system pressure must be applied to the high and low side of the transmitter Failure to do so could result in false indicat...

Page 49: ...ualizer valve item B 6 Attach the low pressure calibration tool to the high side manifold vent test port 7 Apply the pressure corresponding to the requirements of the application 8 The applied pressure will be visible on the device display IMPORTANT NOTE If the differential pressure measurement changes beyond the limit documented in the device specification this is an indication of a leak in the s...

Page 50: ...akes into account a transmitter and a typical digital calibrator Refer to the 266 MODBUS multivariable transmitter data sheet listed under Additional publications page vii for device accuracy statements P N 2101131 Error budget calculation example Assuming a factory calibrated span FCS of 62 5 kPa And a validation point of 100 of FCS The Device Error 0 04 of Indicated Value The Calibration Device ...

Page 51: ...ify that the manifold vent valve item C is closed 4 Slowly open the stream tap valves items H and L to open the process stream creating flow Wait until the system has pressurized typically less than 1 minute before continuing 5 Close the equalizing valves items A and B on the manifold The transmitter is now commissioned into operation Completion of the proceeding sections indicates the transmitter...

Page 52: ...lacement parts Some 266 MODBUS multivariable transmitter parts may be field replaced Figure 34 shows an exploded view of the transmitter and the available replacement parts Table 13 lists each part number and description Terminal Block Meter LCD assembly Type 2 2 Window cover Electronics Module HMI Connector 6 Pin Type 2 2 Blind cover Measurement assembly not a replacement part Figure 34 266 MODBU...

Page 53: ...osive environments unless the area is known to be non hazardous Verify an explosive atmosphere is not present before removing the housing covers when the power is live 1 Disconnect the power supply to the transmitter if power is not required for maintenance or troubleshooting procedures 2 Locate the security screw A or B adjacent to the housing cover Figure 35 and turn it clockwise using the provi...

Page 54: ...e atmosphere is not present before removing the housing covers when the power is live This procedure does not require the transmitter to be powered up 2 Remove the front housing cover following the instructions in section 5 2 1 Removing the housing cover 3 Remove the LCD assembly following the instructions in step 3 section 5 4 Replacing the LCD assembly 4 Locate DIP switch 5 on the electronics mo...

Page 55: ...e removing the housing covers when the power is live This procedure does not require the transmitter to be powered up 2 Remove the front housing cover following the instructions in section 5 2 1 Removing the housing cover 3 Remove the LCD assembly following the instructions in step 3 section 5 4 Replacing the LCD assembly 4 Locate DIP switch 5 on the electronics module Figure 36 Switches are numbe...

Page 56: ...o remove the front housing cover exposing the interior 3 Use a slotted screwdriver to press the tabs on the LCD fixing locks to release the assembly and remove it Figure 37 NOTICE Property damage Removing the LCD assembly improperly may damage the assembly Release the fixing locks on the LCD assembly before attempting to remove the LCD Failure to release the locks may cause the LCD assembly to bre...

Page 57: ...plosive atmosphere is not present before removing the housing covers when power is live This procedure does not require the transmitter to remain powered up 1 Disconnect the power supply to the transmitter 2 Use the instructions in section 5 2 1 Removing the housing cover to remove the front housing cover exposing the interior 3 Use a slotted screwdriver to press the tabs on the LCD fixing locks t...

Page 58: ...ed down again and powered up to finish the procedure 1 Determine the device software version a Press the right soft key to access the HMI menu b Use the key pad to locate and select Device Info Revisions Software Revision c View the software revision Figure 38 The first seven 7 digits before the slash mark represent the electronic module software revision and the six 6 digits following the slash m...

Page 59: ...6 Rev AB 51 MODBUS ON FOR SWITCH SETTING INFORMATION SEE OPERATING INSTRUCTION WRITE PROTECT ENABLE DISABLE SW 5 ON Electronics board fastening screws Figure 39 Electronics module 6 Disconnect the ribbon cable from the base of the electronics module Figure 40 Figure 40 Ribbon cable ...

Page 60: ...Figure 41 Go to section 5 5 Replacing the HMI connector for additional information Figure 41 HMI connector 8 Install the new electronics module a Attach ribbon cable to the new module Figure 40 page 51 b Push the new module into place c Secure the module with the fastening screws Figure 39 page 51 9 Disable write protection by flipping switch 5 to the down OFF position Figure 42 DIP switches are n...

Page 61: ...le iii Disconnect the power to the transmitter iv Using a small slotted screwdriver move DIP switch 1 back to the OFF down position b Procedure B i Using a small slotted screwdriver move DIP switches 1 2 3 and 4 to the ON up position ii Reconnect the power to the transmitter After 60 seconds the configuration will transfer to the electronics module iii Disconnect the power to the transmitter iv Us...

Page 62: ...t power at the source can cause death or severe injury from direct or indirect contact with live wires or lead to indirect injuries resulting from an electrical shock This procedure requires that power be removed from the transmitter at the power supply source 1 Disconnect the power supply at the source 2 Use the instructions in section 5 2 1 Removing the housing cover to remove the rear housing c...

Page 63: ...operable or dangerous to operate Be sure to secure the block mounting screws before reconnecting the wires The terminal block mounting screws act as a ground and connecting field terminations prematurely could create a short circuit 6 Reconnect the following terminations to the terminal block in this order Figure 43 a RTD b RS 485 c Power 7 Replace and secure the rear housing cover go to section 5...

Page 64: ...ntinue to the next step 4 Press the right soft key to access the main Menu on the HMI 5 Use the key pad to locate and select Display Contrast 6 Verify that the contrast setting is set to a value of 50 Figure 45 If the value is near 0 or 100 adjust the contrast that best works for the site Figure 45 Contrast setting a Select Edit to edit the new contrast value number IMPORTANT NOTES The contrast fi...

Page 65: ...xplosive atmosphere is not present before removing the housing covers when power is live This procedure does not require the transmitter to remain powered up 1 Disconnect power to the transmitter 2 Use the instructions in section 5 2 1 Removing the housing cover to remove the rear housing cover exposing the terminal block 3 Disconnect all RTD termination wires from the terminal block Figure 46 Fig...

Page 66: ...d value should be 2 5 ohms 3 If either measurements are out of specification the RTD to transmitter wire may be damaged Further investigate cable for damage or replace cable Removing the transmitter from service If the transmitter is in production and needs to be removed from service isolate the transmitter from the measurement stream by decommissioning the transmitter 1 Open the equalizing valves...

Page 67: ... save the calibration Save to User revert to the factory calibration Reset to Factory or revert to the user saved calibration Reset to User for individual sensors or for the entire calibration For more details concerning calibration go to section 5 12 8 Additional calibration menu commands Table 14 Calibration menu Main Menu Submenu 1 Submenu 2 Selections Calibrate Diff Press Sensor Calibration Un...

Page 68: ...ll through the menu for the desired calibration unit selection and select OK when finished Defining DP calibration units first time only 1 Press the right soft key to access the HMI menu 2 Use the key pad to locate and select Calibrate Diff Press Sensor Calibration Units Edit 3 Scroll through the menu for the desired calibration unit selection and select OK when finished Defining process temperatu...

Page 69: ...the Next key until the cursor reaches the incorrect digit then change it e When the value is equal to the value of the pressure calibrator then select Continue The user should now see the indication that the low trim calibration is complete 5 Set the SP high trim value a Verify that the equalizer valves items A and B are open and that the manifold vent valve item C is closed b Use the key pad to l...

Page 70: ...cursor reaches the incorrect digit then change it e When the value is equal to the value of the pressure calibrator then select Continue The user should now see the indication that the low trim calibration is complete 5 Set the DP high trim value a Close the high equalizer valve item B b Use the key pad to locate and select High Trimming from the menu c Pressurize the calibrator to the desired hig...

Page 71: ...equal to the value of the calibrator then select Continue The user should now see the indication that the low trim calibration is complete 3 Select High Trimming from the menu a Set the input to the highest thermal point expected from the application b The display will have the current measured value Select Continue when the reading is stable c Enter the high value in the New field i To enter a va...

Page 72: ...rformed after the user has completed the calibration of all sensors Reset to User Resets the value for either SP DP or Temperature depending on the sensor menu involved to the values saved by the Save to User command Reset to Factory Resets the calibration for either SP DP or Temperature depending on the sensor menu involved to the values saved during the factory calibration The additional calibra...

Page 73: ...ht temperature 30 C less transmitter temperature 15 C Optimum warm up time 20 minutes Operating temperature 5 minutes plus acclimation time 15 minutes The correction must also be made at zero flow DP 0 To remove the offsets use the bias options in the Device Setup menu Table 15 Table 15 Device menu Menu Submenu 1 Submenu 2 Selections or Description Device Setup Set Diff Press Units Pa inH2068F kg ...

Page 74: ...iable transmitter User manual 2105216 Rev AB Menu Submenu 1 Submenu 2 Selections or Description Reset SP Bias This removes the user saved bias Set Proc temp Unit Degree C F R K Lower Range Value Upper Range Value Damping Factory Reset N A Ok or Back ...

Page 75: ...splay a If SP The barometric pressure being used no correction is necessary b If the SP The barometric pressure being used proceed as follows 7 Use the key pad to locate and select Set Stat Press Bias Set SP to Value The current set point value shows on the HMI display IMPORTANT NOTE If the device does not have a current adjustment value the displayed entry will be 0 0000 8 Use the key pad to sele...

Page 76: ... equalizer and vent valves Figure 47 items A B and C page 58 are open and that the high H and low L tap valves are closed 4 Press the right soft key to access the HMI menu 5 Use the key pad to locate and select Device Setup 6 Check the DP reading on the HMI display a If DP 0 correction is not required b If the DP 0 proceed as follows 7 Use the key pad to locate and select Set Diff Press Bias Set D...

Page 77: ...1 DIP switch access for assistance 2 Press the right soft key to access the HMI menu 3 Use the key pad to locate and select Device Setup Factory Reset OK This restores all of the original factory settings IMPORTANT NOTES When a Factory Reset is commanded the transmitter baud rate will be changed to a value of 9600 default If another value is required go to the Communication submenu and change the ...

Page 78: ... the Operator Menu Diagnostics Figure 49 Figure 49 Operator menu diagnostics screen 2 The alarm and diagnostic code are shown in the window Figure 50 Figure 50 Sensor alarm detail screen 3 Press the right soft key Exit to return to the main display IMPORTANT NOTES Alarm conditions if any display one at a time If multiple alarms exist in the transmitter each condition must be cleared before the nex...

Page 79: ...MODBUS registers to view the RTD maximum ever measured value and the RTD minimum ever measured value If the RTD has exceeded a critical limit replace the RTD go to section 5 9 Replacing the RTD probe P dP Out Of Limits The transmitter s measuring range or model configuration is not appropriate for this application Verify that the measuring range was calculated correctly and that the transmitter is...

Page 80: ...module go to section 5 6 Replacing the electronics module Electronic Memory Failure Electronic memory is damaged Replace the transmitter s electronics module go to section 5 6 Replacing the electronics module NV Electronic Memory Burn Error Writing to non volatile memory was not successful Replace the transmitter s electronics module go to section 5 6 Replacing the electronics module Max Working P...

Page 81: ...ntial for explosion Failure to observe this safety information may result in death or severe injury Do not remove housing covers in hazardous classified areas or explosive environments unless the area is known to be non hazardous Verify an explosive atmosphere is not present before removing the housing covers when power is live This procedure requires the transmitter to remain powered up 1 Use the...

Page 82: ...power transmission is within the proper range and the screen is still blank verify that the power supply at the termination block is within range a Leaving the transmitter powered up use the instructions in section 5 2 1 to remove the rear housing cover exposing the terminal block b Using a multimeter measure the power supply at the termination block and verify it is receiving at least 10 5 Vdc bu...

Page 83: ...identified the problem the LCD assembly or terminal block should be replaced The following instructions provide the steps for replacing these assemblies WARNING Bodily injury When the housing covers are removed and power is still connected there is a potential for explosion Failure to observe this safety information may result in death or severe injury Do not remove housing covers in hazardous cla...

Page 84: ...ice Table 17 Table 17 Communication parameters Main Menu Submenu 1 Selections Communication TAG enter name Address Modbus address 1 247 Baud rate 1200 2400 4800 9600 19200 38400 Response Delay in ms Parity None Even Odd Modbus Map Select ABB 266 x2F267 Map Rosemount 3095FB Map Invensys IMV25 Map Modbus Reg Offset Zero Based One Based a If the parameters do not match those set in the Host device ma...

Page 85: ...5 communication wiring 2 If multiple transmitters are part of the same RS 485 Bus then each must be checked for proper wiring connections and that the last unit is properly terminated If communication has been restored it is not necessary to continue this procedure 3 If the transmitter is still experiencing a communication failure the terminal block should be replaced Go to section 5 7 Replacing t...

Page 86: ... 1 800 442 3097 International Number 1 918 338 4880 Fax 918 338 4607 Email totalflow order us abb com Transmitter return information Use the original packaging or a secure transport container to return the transmitter for repair Comply with the following instructions concerning the return of equipment All returns to ABB require a Return Authorization RA number before shipping Contact our Returns d...

Page 87: ...s the defined units of measure and a bar view of the operating temperature measured as a percent of the temperature between the upper and lower range values The Operator Page 1 is also user definable by editing the properties in the Display menu To access the Operator Menu press the right soft key Press the left soft key to access the Main Menu Use the up and down arrow keys and the right and left...

Page 88: ...HgOC kPa Atm mmHgOC mbar g cm2 Diff Pressure LRV N A Diff Pressure URV N A Diff Pressure Damping N A Static Pressure Unit N A Pa inH2068F kg cm2 Mpa inH2060F mmH2068F bar inH204C ftH2068F PSI Torr inHgOC kPa Atm mmHgOC mbar g cm2 Static Pressure LRV N A Static Pressure URV N A Static Pressure Damping N A Process Temp Unit N A Degree C F R K Process Temp LRV N A Process Temp URV N A Process Temp Da...

Page 89: ... kg cm2 Mpa inH2060F mmH2068F bar inH204C ftH2068F PSI Torr inHgOC kPa Atm mmHgOC mbar g cm2 Lower Range Value Upper Range Value Damping Set Static Press Bias Set SP To Value Applies a bias to make current displayed value equal the entered value Reset SP Bias This removes the user saved bias Set Proc temp Unit Degree C F R K Lower Range Value Upper Range Value Damping Factory Reset N A Ok or Back ...

Page 90: ...60F mmH2068F bar inH204C ftH2068F PSI Torr inHgOC kPa Atm mmHgOC mbar g cm2 Low Trimming High Trimming Save to User Stores SP sensor settings in the transmitter s nonvolatile memory Reset to User Reverts to the last Save to User SP settings Reset to Factory Reverts to SP sensor settings as shipped from the factory Process Temp Sensor Calibration Units Degree C F R K Low Trimming High Trimming Save...

Page 91: ...er Range Value Low Range Value Static Pressure High Sensor Limit Low Sensor Limit Upper Range Value Low Range Value Sensor Temp High Sensor Limit Low Sensor Limit Revisions Hardware Revision Software Revision Communication TAG N A Name Address N A MODBUS address 1 247 Baud rate N A 1200 2400 4800 9600 19200 38400 Response Delay N A Parity N A None Even Odd MODBUS Map Select N A ABB 266 x2F267 Map ...

Page 92: ...any time during operation This alternate functionality allows the unit to be moved into write protect mode while still operating IMPORTANT NOTES DIP switch 6 is not connected Always disconnect the transmitter from the power supply before making changes to DIP switches 1 through 4 The transmitter must then be restarted in order for the new configurations to be loaded B 1 DIP switch access Use the f...

Page 93: ...4 5 6 Description OFF OFF OFF OFF OFF Not used Default settings Writing to the transmitter is allowed ON ON ON ON OFF Not used SPECIAL NOTE Clears the nonvolatile memory in the transmitter and reloads the fixed defaults It will then copy the current configuration of the electronics module to the measurement assembly This should only be used when upgrading a device in which the software revision is...

Page 94: ...T090100001 See 4 3 1 1 Set MODBUS device address page 38 RO 9 5017 5018 U32 Date Factory Characterized seconds since 1970 Jan 1st RO 10 5019 5020 U32 Communication Board Hardware example value 0x00010203 represents 1 2 3 bits 23 16 Major Revision compatibility change bits 15 8 Minor Revision functionality or operation bits 7 0 Sub minor Revision bug fixes RO 11 5021 5022 U32 Sensor Board Hardware ...

Page 95: ...ibration Unit Pressure Register 449 is not a register and it returns zero when read and does nothing when written Register 450 Default 65535 reads as register 481 until it is written Values 1 Inches H2O 4C 2 Inches HG 0C 3 Feet H2O_68F 4 Millimeter H2O_68F 5 Millimeter HG 0C 6 PSI 7 BAR 8 Millibar 9 Gram per square centimeter 10 Kilogram per square centimeter 11 Pascal 12 Kilopascal 13 Torr 14 Atm...

Page 96: ...487 488 489 490 RESERVED un implemented registers All access returns an ILLEGAL FUNCTION error code NONE 199 491 U16 Reset to factory configuration Value written is the specific subsystem index to reset 1 ALL subsystem 0 Coordinator subsystem 1 Diagnosis subsystem 2 Electronic subsystem 3 HMI display subsystem 4 Pressure subsystem 5 Measurement sensor interface subsystem 6 Sservice port interface ...

Page 97: ...rating Lower Range Value R W Customer Max Min Values 5549 5057 5058 F DP Maximum measured value Write always sets value to current measurement the value from the write request is ignored R W 5550 5059 5060 F DP Minimum measured value Write always sets value to current measurement the value from the write request is ignored R W 5551 5061 5062 F SP Maximum measured value Write always sets value to c...

Page 98: ...Set at this level in SP units referenced to register 5543 s URV URV LRV SPHysteresis 0 01 RO 5572 5103 5104 F SP Below LRV Alarm Set at this level in SP units referenced to register 5544 s URV URV LRV SPHysteresis 0 01 RO 5573 5105 5106 F SP Below URV Alarm Clears at this level in SP units referenced to register 5543 s LRV URV LRV SPHysteresis 0 01 2 RO 5574 5107 5108 F SP Above LRV Alarm Clears a...

Page 99: ...Appendix C MODBUS register lists 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 91 ...

Page 100: ...006 7009 09 U8 0 Hardware Rev Level 7010 10 U8 16 Modbus Specific Rev Level 7011 11 U8 23 Sensor Type absolute SP 7012 12 U8 1 reserved 7013 13 U8 0 Reserved 7014 14 U8 0 Reserved 7015 15 U8 8 Baud rate selector 1 1200 2 2400 3 4800 4 9600 5 1200 6 2400 7 4800 8 9600 9 19200 7016 16 U8 247 Modbus Transmitter address 7017 17 U8 252 DP Sensor Range Code unknown code 7018 18 U8 252 SP Sensor Range Co...

Page 101: ...nding on configuration 7404 407 408 U32 Diagnostics Status Word 1 and 2 7405 409 410 U32 Diagnostics Status Word 3 and 4 7406 411 412 U32 Diagnostics Status Word 5 and 6 7407 413 414 F DP URL Upper Range Limit Set by Measurement Sensor 7408 415 416 F DP LRL Lower Range Limit Set by Measurement Sensor 7409 417 418 F DP URV Operating Upper Range Value default URL 7410 419 420 F DP LRV Operating Lowe...

Page 102: ...MV25 emulation register map Invensys Model IMV25 MODBUS compatibility register map will use the Rosemount map after subtracting 40000 from the requested register address The fixed register range 40000 40500 is used for this emulation mode For example an Invensys register of 40401 will be a Rosemount register of 401 ...

Page 103: ...ard 4 Fill the vertical section of the connecting lines with a compatible fluid through the filling tees 5 Commission the transmitter a Open the equalizing valve C Figure 55 b Close the low pressure B and high pressure A valves c Open the gate valves items HG and LG d Slowly open the high pressure A valve to admit process fluid to both sides of the primary e Vent or drain the primary unit and then...

Page 104: ...nk with non condensable fluids dry leg are 1 Mount the transmitter at the same height or below the lowest level to be measured Figure 56 2 Connect the H side of the transmitter to the bottom of the tank 3 Connect the L side of the transmitter to the upper part of the tank above the maximum fill level of the tank Where H High pressure flange L Low pressure flange Figure 56 Level measurement on a cl...

Page 105: ... at the same height or below the lowest level to be measured Figure 57 2 Connect the H side of the transmitter to the bottom of the tank 3 Connect the L side of the transmitter to the upper part of the tank 4 Fill the vertical section E of the connecting line to the upper part of the tank with a compatible liquid through the dedicated filling tee Where E Vertical connecting line H High pressure fl...

Page 106: ...tifications ATEX Code E2 and IECEx Code E9 Code E2 Rating ATEX II 1 2 G Ex d IIC T6 and ATEX II 1 2 D Ex tD A21 IP67 T85 C Ta 50 C to 75 C FM Approvals Certificate FM09ATEX0023X The meaning of the ATEX code is as follows II Equipment Group for hazardous surface areas not mines 1 2 Category This means the transmitter is suitable for use in the partition to category 1 e g sensor category 1 transmitt...

Page 107: ...tion type the first characteristic numeral indicates the protection of the integrated electronics against ingress of solid foreign objects including dusts The assigned 6 means a dust tight enclosure no ingress of dust The second characteristic numeral indicates the protection of the integrated electronics against ingress of water The assigned 7 means a water protected enclosure against a temporary...

Page 108: ...gned 7 means a water protected enclosure against a temporary immersion in water under standardized conditions of pressure and time IMPORTANT NOTES The number printed by the CE mark on the safety label identifies the Notified Body which has responsibility for the surveillance of the production Code ER Rating IECEx Ex nA IIC T6 Ta 50 C to 85 C and IECEx Ex tD A22 IP67 T85 C Ta 50 C to 75 C FM Approv...

Page 109: ... are with or without integrated digital display C22 2 No 142 M1987 Process Control Equipment Industrial Products C22 2 No 213 M1987 Non incendive Electrical Equipment for Use in Class I Division 2 Hazardous Locations Industrial Products C22 2 No 30 Explosion Proof Enclosures for Use in Class I Hazardous Locations Industrial Products C22 2 No 25 Enclosures for Use in Class II Groups E F and G Hazar...

Page 110: ...mbient C Maximum ambient C Imax mA Power W T4 50 C 85 C 100 0 75 T4 50 C 70 C 160 1 T5 50 C 40 C 100 1 75 T6 50 C 40 C 50 0 4 Type 4X applications Indoors Outdoors Dual Seal per ANSI ISA 12 27 01 as indicated WARNING When installed power must be supplied to this transmitter by a voltage limiting device which will prevent the rated voltage of 30 Vdc being exceeded The temperature sensor circuit Pt1...

Page 111: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 103 Appendix F Approvals and certifications F 1 USA Explosion Proof ...

Page 112: ...Appendix F Approvals and certifications 104 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 113: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 105 ...

Page 114: ...Appendix F Approvals and certifications 106 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 115: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 107 F 2 USA Non Incendive ...

Page 116: ...Appendix F Approvals and certifications 108 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 117: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 109 ...

Page 118: ...Appendix F Approvals and certifications 110 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 119: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 111 ...

Page 120: ...Appendix F Approvals and certifications 112 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 121: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 113 F 3 Canada Explosion Proof ...

Page 122: ...Appendix F Approvals and certifications 114 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 123: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 115 ...

Page 124: ...Appendix F Approvals and certifications 116 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 125: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 117 F 4 Canada Non Incendive ...

Page 126: ...Appendix F Approvals and certifications 118 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 127: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 119 ...

Page 128: ...Appendix F Approvals and certifications 120 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 129: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 121 ...

Page 130: ...Appendix F Approvals and certifications 122 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 131: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 123 F 5 IECEx Flame Proof ...

Page 132: ...Appendix F Approvals and certifications 124 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 133: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 125 ...

Page 134: ...Appendix F Approvals and certifications 126 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 135: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 127 ...

Page 136: ...Appendix F Approvals and certifications 128 266 MODBUS multivariable transmitter User manual 2105216 Rev AB F 6 IECEx Non Sparking ...

Page 137: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 129 ...

Page 138: ...Appendix F Approvals and certifications 130 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 139: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 131 ...

Page 140: ...Appendix F Approvals and certifications 132 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 141: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 133 ...

Page 142: ...Appendix F Approvals and certifications 134 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 143: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 135 F 7 ATEX Flame Proof ...

Page 144: ...Appendix F Approvals and certifications 136 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 145: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 137 ...

Page 146: ...Appendix F Approvals and certifications 138 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 147: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 139 ...

Page 148: ...Appendix F Approvals and certifications 140 266 MODBUS multivariable transmitter User manual 2105216 Rev AB F 8 ATEX Non Sparking ...

Page 149: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 141 ...

Page 150: ...Appendix F Approvals and certifications 142 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 151: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 143 ...

Page 152: ...Appendix F Approvals and certifications 144 266 MODBUS multivariable transmitter User manual 2105216 Rev AB ...

Page 153: ...Appendix F Approvals and certifications 266 MODBUS multivariable transmitter User manual 2105216 Rev AB 145 ...

Page 154: ...the device is not present For devices which do generate heat this temperature is the temperature of the medium surrounding the device when the device is present and generating heat Allowable ambient temperature limits are based on the assumption that the device is not exposed to significant radiant energy sources such as sunlight or heated surfaces analog a system in which data is represented as a...

Page 155: ...stem that performs operations on data In a personal computer the CPU is typically a single microprocessor integrated circuit character a letter digit or other symbol that is used as the representation of data A connected sequence of characters is called a character string COMM abbreviation for communication port communication port COMM communication port abbreviated COMM refers to the Host compute...

Page 156: ... line one bit to transfer data bits sequentially The term serial port usually is limited to hardware that is more or less compliant to the RS 232 standard rather than other serial interfaces like USB and Ethernet span measuring span The algebraic difference between the start of the measuring range and the end of the measuring range The smallest span is the smallest value that can be selected witho...

Page 157: ... of voltage or potential difference One thousand volts 1kV voltage electrical pressure the force which causes current to flow through a conductor Voltage must be expressed as a difference of potential between two points since it is a relational term Connecting both voltmeter leads to the same point will show no voltage present although the voltage between that point and ground may be hundreds or t...

Page 158: ...ns 11 Communication menu 83 Communication parameters 13 Configuration Communication 36 Device bias 36 Easy Setup 35 HMI menu navigation 34 Security setup 43 Setting bias 65 Startup 34 Transmitter 34 Configuring the transmitter 34 Connections Electrical 28 Manifold valves 39 Contact us 156 Customer service 78 Contact 78 Hardware and software version 78 Transmitter return 78 Customer service and sup...

Page 159: ...verview 15 Menu Structure 79 Menu tree 15 Replacing connector 49 HMI configuration and management menus 15 HMI connector replacing 49 Horizontal flange Dimensions 4 Horizontal flange direct mount 19 Horizontal flange pipe mount 21 Housing and display orientation 23 Housing cover Removing 45 Securing 45 Human machine interface 14 Identifying the product model 18 IECEx Flame Proof 123 Non Sparking 1...

Page 160: ...vensys 12 94 MODBUS 86 Rosemount 12 92 Remote thermal detector Installation 25 Remote thermal detector Non Incendive installation 27 Removing Housing cover 45 Transmitter from service 58 Removing offsets 36 65 Replacement Electronics module 50 HMI connector 49 LCD assembly 48 Parts 44 RTD 57 Terminal block 54 Replacing Housing cover 45 Replacing the electronics module 50 Replacing the HMI connecto...

Page 161: ...e MODBUS device address 38 Software version 78 SP calibration 61 SP Specifications 9 Specifications 7 Start up 33 Subassemblies 6 Supplying power 33 Troubleshooting 70 User interface 14 Write protection 46 Write protection mode disabled 47 Write protection mode enabled 46 Transmitter accuracy 4 Transmitter accuracy and traceability standards 4 Transmitter communication configuration 36 Transmitter...

Page 162: ...s 5 Vertical flange direct mount 20 Wiring DIV 1 RTD probe 25 Electrical 30 Electrical connections 28 Non Incendive RTD 27 Protective conductor and ground 28 RS 485 connections 77 RTD to Transmitter 30 Write protection DIP switch 5 85 Write protection mode 46 Write protection mode disabled 47 Write protection mode enabled 46 ...

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Page 164: ...ad Suite 405 407 Bakersfield CA 93313 Ph 1 661 833 2030 Texas Office Pleasanton 150 Eagle Ford Road Pleasanton TX 78064 Ph 1 830 569 8062 We reserve the right to make technical changes or modify the contents of this document without prior notice With regard to purchase orders the agreed particulars shall prevail ABB does not accept any responsibility whatsoever for potential errors or possible lac...

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