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Emerson Vilter VilTech, Operation And Service Manual

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Emerson Vilter VilTech Operation And Service Manual Download Page 143

143

APPENDIX C

Communication Protocols

Introduction

The hardware interface and software protocol are defined for performing serial
communications with the Viltech using the Modbus RTU protocol.  In this case, the
implementation of the protocol is limited to the sub-set of the complete set of possible
message types.  Communications with one or more compressors is possible using a RS-
485 or RS-422 multi-drop interface.

NOTE: Modbus is a registered trademark of Modicon, Inc.

Real time monitoring of the following data is provided:

•

Analog input parameters

•

Discrete I/O parameters

•

Mode and State information

•

Computed parameters

•

Alarm Information

Real time control of the following parameters is provided:

•

Compressor Control including start/stop and mode changes

•

Compressor Capacity Control Setpoints

Applicable Documents

Familiarity with the following documents is highly recommended:

•

Modicon Modbus Protocol Reference Guide (PI-MBUS300)

Summary of Contents for Vilter VilTech

Page 1: ...VILTech micro controller Operation and service manual ...

Page 2: ...2 ...

Page 3: ...ould be per NEC Specifically check for proper voltage and that the neutral is grounded at the source An equipment ground should also be ran to the panel See Wiring Instructions and Diagrams before proceeding Before start up enterall system values and options See section on SetpointValues ...

Page 4: ...Data Input Fields 26 Absolute Pressure Fields 27 Time Fields 27 Date Fields 27 String Fields 28 Telephone Number Field 28 Hexadecimal Fields 28 Status Screens 30 Confirmation Screens 31 Confirmation Screen Procedures 31 Momentary Screens 32 Information Screens 33 Access Screens 34 Log Screens 35 Alarms Failures 36 Modes Of Operation 39 Chapter 2 39 Compressor Controls 39 Starting the Compressor 40...

Page 5: ...equenced Mode 47 Forced Unloading Limiting 47 Ramp Start 47 Capacity Ramp Start Limiting 48 Staging Setup 49 Minimum Capacity 49 Setpoint Scheduling 50 Daily Schedules 50 Weekly Schedule 50 Oil Pressure Computation 50 OilTemperature Regulation 50 Anti Cycle Timer 51 Power Fail Restart 51 Process Temperature Control Option 51 Two Stage Configuration Option 51 Operational Procedures 52 Status Screen...

Page 6: ...e Page 71 Capacity Setpoints 72 Scheduling 73 Control 73 Active Group 74 Active Schedule 74 Weekly Schedule 75 Daily Schedule 75 CAP Control 77 Suction Pressure Control Setpoints 77 Process Temperature Control Setpoints 78 MISC Control 79 LOGSHotKey 80 MENUS Hot Key 80 Chapter 3 81 Logging Functions Technical overview 81 Logging Functions 81 Trend Log 82 Alarm Log 82 Failure Log 82 User Log 82 Log...

Page 7: ...98 Communication Status 100 Override Discrete I O 101 Set up 102 Set Clock 102 Calibrate Sensors 103 Dynamic Sensor Calibration 104 Static Sensor Calibration 105 Password Control 106 Password Control Screen 106 Add Delete User 107 Access Levels 108 Initialization 109 Power Fail Reset 109 Set Factory Config 110 Setpoint Save Restore 110 Save Restore Status 110 Configuration 111 Display 111 Comm Set...

Page 8: ...ULESETUP 127 DAILYSCHEDULE 127 SCHEDULE01 127 SCEHDULE02 127 SCHEDULE07 127 HIGHALARM 127 LEADLISTA 127 LEADLISTB 127 CURRENTACTIVELEADLIST 131 Control Group Select 132 CONTROLSETPT 132 LOWALARM 132 LOWFAILURE 133 Schedule Setup 133 Daily Schedules 134 SCHEDULEDTIME 134 SELECTEDGROUP 134 SELECTEDLEAD 134 LIST 134 HighAlarm 135 Addendum for Pump Down Program for VILTech 136 APPENDIX A 139 Alarm and...

Page 9: ... Error Messages 151 Data Formats 151 Status Message Description 152 Analog Input and Computed Parameters 152 Discrtete Input and Outputs 153 Alarm and Failure Data 154 Equipment Data 157 Alarm Status Table 157 Compressor Mode Table 157 Compressor State Table 158 Last RECIP Start Status Table 160 Control Message Description 160 Network in Control Command 161 Compressor Start Stop 161 Set Comressor ...

Page 10: ...10 Notes Page ...

Page 11: ...11 ...

Page 12: ...main 3 5amp I O 1 400K ControllerPowerSupply 2 3400M 120VAC Solid State Output Module 2 3400N 120VAC Solid State Input Module 1 3400R EEPROM 1 3400Y Cable Kit incl display cable p s to main p s to I O bd 1 2611N DETECTOR 58 122DEG TEMP RESIST 4 20MA 1 2611P DETECTOR 32 392DEG TEMP RESIST 4 20MA 1 2783D2 TRANSDUCERAKS33 0 414 5PSIA4 20MAOUT 1 2783D4 TRANSDUCERAKS33 0 200PSIA4 20MAOUT 2 3122B CORDSE...

Page 13: ...setpoints by pushing SETPT key then 2 for Setpoints Now go through each screen for 1 Pressure 2 Temperature and 3 Capacity Use the QUIT or SAVE button to go to previous screen 6 Still under Setpt screen setup Capactiy Control by pressing 4 and Misc Control by pressing 5 If multiple control setpoints are going to be used then setup a Schedule by pressing 3 pleasereadthemanualformoreinformation 7 No...

Page 14: ...14 Chapter 1 Retrofit Kit Instructions Belt Drive Mount at Motor End of Unit Direct Drive Mount Suction Side of Unit ...

Page 15: ...ing in or run any wiring on top of panel Do not run DC voltage on the sam e side as the AC Volta ge All 120V wires must enter the lowe r right corner of panel or all warranties will be void DONOTRUNAC and DCwires TOGETHER ...

Page 16: ...16 ...

Page 17: ... TIGHTENING TORQUE 4 LB IN 10 MAXIMUM TOTAL SENSOR DRAW IS 2 AMPS IF GREATER THAN 2 AMPS IS REQUIRED CUSTOMER SUPPLIED POWER SUPPLY IS REQUIRED CONSULT MANUFACTURER FOR DETAILS 11 MAX WIRE SIZE FOR I O BOARD TERMINAL IS 12AWG USE COPPER CONDUCTORS ONLY WITH TEMPERATURE RATING 60 C OR HIGHER TIGHTEN ING TORQUE 4 LB IN MAXIMUM CURRENT FOR FORM C RELAY IS 4 AMPS MAXIMUM CURRENT FOR SOLID STATE OUTPUT...

Page 18: ...18 ...

Page 19: ...aracter Screens are screens that use large double high characters and also contain the title banner and hot keys Main Status Screen is a large character status screen which is considered the main system status screen This screen will also contain the alarm status mode and state of the system Parameter is a system control value which is displayed by the system or input by the user Examples are suct...

Page 20: ...20 Keypad Functions The following is a brief summary of the Viltech keypad along with a description of its individual keys Below is a drawing of the Viltech keypad layout Keypad Diagram ...

Page 21: ... key moves the cursor right to the next item on the screen This key also permits the user to page back one full screen at a time on log and status screens PGUP The PG UP key is used to page back one full screen at a time for status screens or to page up to more current data on log screens PGDN The PG DN key is used to page forward one full screen at a time for status screens or to page down to old...

Page 22: ...tation of the main screen layout and labels each of its various areas Title Banner The top highlighted bar contains the Vilter logo and the current time of day and may only be found on large character screens DisplayArea Contains all of the detailed screen information Large character screens will use only the designated display area while small character screens use the entire LCD display Title Ba...

Page 23: ...try Screen used to modify system control parameters Status Screen displays real time system summary data Confirmation Screen used for verification gives a choice for a yes or no option Momentary Screen displays a message for three seconds Information Screen used to display system information Access Screen a menu type screen with an number input field Log Screen displays a record of system paramete...

Page 24: ...er keys corresponding to the desired menu item or the arrow keys and press ENTER to select the desired menu item Data Entry Screens DATA ENTRY SCREENS are user interactive screens which allow the user to change or input system data These screens contain a special cursor to signify the field type at the cursor location The cursor can be moved throughout the screen to indicate each field location NO...

Page 25: ...ontain both numerical input and selectable fields which are identified by different cursors as shown in the following table Cursors Selectable cursor indicated a selectable field Numerical input cursor indicates a number field Data Entry Procedures 1 Verify Screen Type One of the special cursors must appear on the screen If the cursor did not appear you are not on a data entry screen 2 Change Fiel...

Page 26: ...leared the previously entered valid data will be restored to the field Selectable Fields ASELECTABLE FIELD gives the user a choice of inputs from which to toggle through and is recognized by the cursor preceding it 1 Verify Cursor Type locate the selection cursor 2 ENTER Key cycles the user through the available selections 3 Arrow Keys move to the next field and accept the selection Numerical Data...

Page 27: ...ecial case numerical field used to enter time data 1 Verify Cursor Type locate the numeric input cursor 2 Number Keypad use the number keys to enter the time you wish displayed For example to input the time 5 59 press 0559 the system automatically moves from hours to the minutes The is automatically entered in a time field This field will allow for whole number acceptance For example to set the ti...

Page 28: ...sed to cycle through the available selections for the current character positions 3 Key Selecting the Positive key puts the field into edit mode and allows the current contents of the field to be entered 4 Arrow Keys Allows you to move within a field to different characters 5 Number Keys These keys are used to enter numbers into a character 6 Clear Key This key is used to clear the content of the ...

Page 29: ...29 ...

Page 30: ...s screens by scrolling through using the ENTER PG UP PG DN RightArrow or LeftArrow keys The number of status screens on a system will vary depending upon the individual system s configuration Another feature of the system is that it will automatically return to the main status screen after 10 minutes of no keyboard activity Below is an example of a Status screen The following table contains a list...

Page 31: ...and their function KEYS FUNCTION NUMBER Used to select a response number KEYPAD ENTER Used to select the highlighted response number UP DOWN ARROWS Moves the cursor from one selection to the next either up or down QUIT Exits from the current screen to the pervious screen Same as selecting NO for most screens or YES when quitting from a data entry screen after making changes Confirmation Screen Pro...

Page 32: ...ire three second time to elapse the operator may press the QUIT key to end viewing of the message The following is an example of a momentary screen The following table contains a list of the active keys on a momentary screen and their function KEY FUNCTION QUIT Stops display of the message before the three second time limit expires Momentary Screen Momentary Screen Keys ...

Page 33: ...these screens may be real time data or a snapshot of data at the time the screen is first displayed The following table contains a list of the active keys on an information screen and their function KEY FUNCTION QUIT Exits from current screen to the previous screen Information Screen Information Screen Keys ...

Page 34: ...the number eight is entered the input area will flash error since there are only seven possible schedules The user will be required to clear the error and enter a correct value The data entry process is described in more detail in the data entry section The following is an example of an access screen The following table contains a list of the active keys on an access screen and their function KEYS...

Page 35: ...g screen The following table contains a list of the active keys on a log screen and their function KEY FUNCTION PGUP Allows the user to page forward and back through the log entries PGDN PG UP shows more recent log entries and PG DN shows older log entries UP DOWN Scrolls line by line through the information The Up arrow shows ARROWS more recent log entries and the Down arrow shows older log entri...

Page 36: ... be changed by the operator These are called OEM safety setpoints and typically indicate a condition that may cause damage to the equipment A detailed list of all system alarms and failures can be found in Appendix A When an alarm or failure is detected the sequence of operations is as follows The equipment controlled by the Viltech may be stopped as in the case of a compressor when a failure occu...

Page 37: ...ng and go to a constant highlight This action will also deactivate the alarm or failure discrete output When multiple alarms are active the acknowledging function operates on the entire set of active alarms or failures 3 Correct Problem The operator must now correct the problem causing the alarm or failure This may be a control parameter that is out of range or various other conditions which shoul...

Page 38: ...38 ...

Page 39: ...on Suction Pressure or Process Temperature Capacity Control is performed automatically to maintain a specific control setpoint 3 Remote Starting Stopping and Capacity Control in the Remote mode can only be performed from a remote computer 4 Auto Remote Similar to theAutomatic mode except starting and stopping are performed using the external Remote Start Stop input or messages from a remote comput...

Page 40: ... the Minimum Capacity setpoint using the Fast Stage Delay Time between stages 5 Once the compressor has loaded to minimum the compressor transitions to the RUNNING state Normal capacity control can now begin The RECIP Compressor can be started manually automatically or remotely based on the operating mode chosen The compressor will not start in any mode if a failure condition exists Manual Start M...

Page 41: ...m a remote computer It is required that the compressor be placed on line via the keypad or using an on line message For more information on Network Operation please refer toAppendix C Sequenced Start In SEQUENCED START the compressor takes commands from an Viltech Master Sequencer Control Panel The Sequenced mode can be selected from the operating modes Once this mode is selected the RECIP compres...

Page 42: ... mode the compressor will stop automatically when the control parameter falls below the cut out setpoint Remote Auto Remote Stop I OControl When remote operation is desired using discrete I O signals the Remote Start Stop input signal is used to stop the compressor for the Auto Remote mode When the Remote Start Stop input is de energized the compressor will stop but remain on line Afailure or manu...

Page 43: ...iately Case 2 When the suction pressure is above cut in and discharge pressure is above the limit unload may be holding the compressor at 0 capacity so the 0 capacity timer will expire and the compressor will restart immediately Manual Capacity Control In MANUAL mode the capacity is adjusted using the keypad on the Viltech The up arrow is used to add stages and the down arrow is used to remove sta...

Page 44: ...n the Control Parameter If the Control Deadband are too large the compressor may not hold the Control Parameter close enough to the Control Setpoint resulting in inefficient capacity control Normal Bandwidth If the difference between the Control Setpoint and the Control Parameter is between the Control Deadband value and the Normal Bandwidth value the Normal Stage Delay timer will be used to deter...

Page 45: ...imer Difference Below Setpoint Remote Capacity Control When the Network Communications option is enabled and the compressor is in the Remote mode capacity control is performed using load and unload messages from a remote computer For more information on network operation please refer to Appendix C Auto Remote Capacity Control When the Network Communications option is enabled and the compressor is ...

Page 46: ...ally and leave it on line for sequenced operation LowAlarm and Failure Setpoints When Sequenced mode is enabled and the compressor is online or running the local low alarm and failure setpoints are replaced by the Sequencer low alarm and failure setpoints This is true for both Suction Pressure and Process Temperature operation The local sensor is still used to generate the alarm or failure conditi...

Page 47: ...ding of the compressor due to high discharge and suction pressure In the Manual mode of operation and forced unloading is enabled Forced Unloading and Limiting will cancel any ongoing capacity control changes If a parameter exceeds the high limit setpoint the compressor will be limited not allowed to load If a parameter exceeds the high unload setpoint the compressor will be forced to unload until...

Page 48: ... minimum capacity to 100 over the ramp duration When the capacity is limited due to this feature the RECIP state will display LIMIT CAP Unlike other limiting and unloading the compressor is not considered fully loaded when in this state The Capacity Ramp Start feature is available in Automatic Auto Remote and Sequenced mode When in Sequenced mode capacity changes are limited when the compressor is...

Page 49: ...is important that the capacity configuration be setup to match the compressor configuration when the controller is initially installed Minimum Capacity Certain compressors should not operate below a minimum capacity value under normal operations The compres sor starts fully unloaded and then must be staged up to the minimum immediately Once the compressor has started and the Up to Speed delay has ...

Page 50: ...dule The WEEKLY SCHEDULE allows the operator to assign different daily schedules to each day of the week A new day begins and schedules change at midnight The current daily schedule or control group may be overridden by the operator at anytime Any item which has been manually overridden will be changed when the next schedule change occurs Oil Pressure Computation The oil pressure for a RECIP compr...

Page 51: ...power was off longer than the power fail restart time a failure is reported If the power loss was less than the setpoint no failure is reported and the compressor remains on line and is allowed to automatically restart if required Process Temperature Control Option When the PROCESS TEMPERATURE option is enabled the RECIP compressor capacity is adjusted to maintain the outlet temperature of a produ...

Page 52: ...is disabled because the compressor is already in the INPROGRESS process of undergoing the start up operation STARTDISABLEDSYSTEM The start function is disabled because the compressor is already IS RUNNING running STARTDISABLEDANTI CYCLE The compressor is delayed from starting An anti cycle timer has been XX XX activated which prevents start up until the time period has expired XX XX is the time re...

Page 53: ...53 ...

Page 54: ...al There are also two system functions which may be performed from this screen Capacity adjustment when in Manual mode and the clearing of alarms and failures The following table lists the additional keys available on the RECIP status screen KEY FUNCTION UPARROW Loads the compressor when RECIP is in Manual or Local mode One stage is added each time the UP arrow key is pressed DOWNARROW Unloads the...

Page 55: ...essure DP Discharge Pressure OP Oil Pressure IP Intermediate Pressure two stage machines only CP Capacity ST Suction Temperature DT Discharge Temperature OT Oil Temperature Status Banner The STATUS BANNER is located at the bottom of the Compressor status screen Active Alarms Failures screen and Auto Start Warning status screen The Banner consists of three highlighted sections which provide the use...

Page 56: ...nloading due to high discharge pressure STOPPING Stopping sequence is in progress FAILED Compressor has failed RESET The Viltech has been reset STOP OFFLINE Compressor is stopped and is off line not available for auto start STOP ONLINE Compressor is stopped and is on line available for auto start STOP CUT OUT Compressor is stopped on cut out pressure or temperature RUN TRIM The compressor is runni...

Page 57: ...the RECIP is operating normally ALARM An alarm is active on the RECIP FAIL A failure is active on the RECIP Operating Hours Screen The OPERATING HOURS STATUS screen allows the operator to view the compressor s current running hours since its last start and the total number of hours the system has been in operation since installation In addition the number of compressor starts is accumulated for to...

Page 58: ...simply pressing the QUIT key An example of the alarm screen is shown below The active function keys for this screen are described in the following table KEY FUNCTION SHIFT UP Switches control between the display area and the hot keys Scrolls line by line through the information DOWNARROWS CLEAR The CLEAR key is used to acknowledge and clear alarms failures as well as to silence the alarm horn Acti...

Page 59: ...all the status screens using the ENTER key The system will return to the Auto Start Warning screen after 10 minutes of keypad inactivity An example of the screen is shown below SETPT Hot Key The SETPT hot key allows the operator to select various systems options available When the SETPT key is selected a menu screen displays the available options contained on the system AUTO StartWarning Screen SE...

Page 60: ...options used to set the systems various setpoints SETPOINTS 1 PRESSURE 1 SUCTIONCONTROLGROUP 2 HIGHSUCTION 3 DISCHARGE 4 OIL 5 INTERMEDIATE Two stage only 2 TEMPERATURE 1 DISCHARGE 2 OIL 3 PROCESSGRP 4 HIGHPROCESS 5 INTERMEDIATE Two stage only 3 CAPACITY SETPT Menu Diagram ...

Page 61: ...etpoints described in the following sections Suction Pressure Control Groups This screen allows the user to set the control values for each of the RECIP s four 4 control groups which are used for Automatic Capacity control An example of the screen is shown below Suction Pressure Control Data Entry Screen ...

Page 62: ...ontrol Set point 29 9INHG185 0PSIG CUT OUT Cut out Setpoint IfAutomatic orAuto Remote mode is selected Auto Start Stop is enabled the compressor is running and the suction pressure falls below the Cut out Setpoint the compressor will stop 29 9INHG185 0PSIG LOWALARM The Suction Pressure value at which the Viltech should report a Low Suction Pressure alarm to the operator for all modes except Sequen...

Page 63: ...group is in control This screen also has the High Suction Limit Unloading for each step of CapacityControl The following table lists the data entry fields for the High Suction Pressure Set points screen TERM DEFINITION RANGE HIGHFAILURE The compressor is failed stopped when this 29 9INHG value is exceeded 185PSIG HIGHALARM The Viltech reports an alarm to the operator when 29 9INHG this value is ex...

Page 64: ...sor is forced to unload when this value is exceeded 0 225 NH3 0 275 FREON HIGHLIMITING The compressor is not allowed to load when this value is exceeded 0 225 NH3 0 275 FREON RAMP UNLOAD The starting value of the forced unload parameter used during ramp start 0 225 NH3 0 275 FREON RAMPLIMITING The starting value of the limiting parameter used during ramp start 0 225 NH3 0 275 FREON RAMPSTARTDELAY ...

Page 65: ...ntry fields and a description of their purpose TERM DEFINITION RANGE LOWALARM The Viltech will report an alarm to the operator when the Oil Pressure is below this value 20 200 PSIG LOWFAILURE The compressor will be failed stopped when the Oil Pressure is below this value 20 200 PSIG NOTE The Oil Pressure on a RECIP Compressor is computed as the differential between the Oil Pressure Sensor and Suct...

Page 66: ...ses TERM DEFINITION RANGE HIGHFAILURE The compressor is failed stopped when the Intermediate Pressure exceeds this value 0 225 PSIG HIGHALARM The Viltech reports an alarm to the operator when the Intermediate Pressure exceeds this value 0 225 PSIG LOWALARM The Viltech will report an alarm to the operator when the Intermediate Pressure is below this value 0 225 PSIG LOWFAILURE The compressor will b...

Page 67: ...S screen allows the operator to set acceptable ranges for the RECIP discharge temperatureand second discharge temperature DT2 for 12 16 single stage compressors The following table lists the data entry fields and a description of their purposes TERM DEFINITION RANGE HIGHFAILURE The compressor is failed stopped when the discharge temperature exceeds this value 32 392DEGF Discharge Temperature Setpo...

Page 68: ...RM The Viltech will report an alarm to the operator when the oil temperature exceeds this value 32 392DEGF HEATERCONTROL The temperature at which to maintain the oil in the separator The oil heater uses the Oil Temperature sensor but only when the compressor is stopped 32 392DEGF LOWALARM The Viltech will report an alarm to the operator when the Oil Temperature is below this value 32 392DEGF LOWFA...

Page 69: ... Automatic or Auto Remote mode of operation the compressor is loaded or unloaded as required to maintain the Control Set point 58 122DEGF CUT OUT Cut out Setpoint If Automatic or Auto Remote mode is selected Auto Start Stop is enabled the compressor is running and the process temperature falls below the Cut out Setpoint the compressor will stop 58 122DEGF LOWALARM An alarm is reported when the Pro...

Page 70: ...he Process Temperature Control option is enabled TERM DEFINITION RANGE HIGHFAILURE A failure is reported and the compressor is shutdown when the Process Temperature rises above the High Failure setpoint 58 122DEGF HIGHALARM An alarm is reported when the Process Temperature rises above the High Alarm setpoint 58 122DEGF Process Temperature Active Group Control Definitions Process Temperature Active...

Page 71: ...e Intermediate Temperature rises above the High Failure setpoint 32 392DEGF HIGHALARM An alarm is reported when the Intermediate Temperature rises above the HighAlarm setpoint 32 392DEGF LOWALARM An alarm is reported when the Intermediate Temperature falls below the low alarm setpoint 32 392DEGF LOWFAILURE An failure is reported and the compressor is shutdown when the Intermediate Temperature fall...

Page 72: ...ntry fields and a description of their purposes TERM DEFINITION RANGE MINIMUMCAPACITY The minimum allowable capacity of the compressor when running 0 100PCT RAMPSTARTDELAY The amount of time after startup that Capacity Limiting will take place 0 60MIN RAMPSTARTENABLE Allows Capacity Ramp Start to be enabled or disabled ENABLE DISABLE Capacity Setpoint Definitions Capacity Setpoint Screen Capacity ...

Page 73: ...tion Scheduling 1 CONTROL 2 ACTIVEGROUP 3 ACTIVESCHED 4 WEEKLYSCHED 5 DAILYSCHED Control The CONTROL screen allows the user to determine if equipment operation will be controlled by predefined schedules An example of this screen is shown below The following table lists the data entry fields and a description of their purposes TERMS DEFINITION RANGE SCHEDULING Allows the Setpoint Scheduling feature...

Page 74: ... to Suction Pressure control groups S1 S4 If Process Temperature control is enabled G1 G4 correspond to Process Temperature control groups P1 P4 G1 G4 Active Schedule The ACTIVE SCHEDULE screen allows the user to change the current active daily schedule This setting will be active until a scheduling change or the user modifies it An example of the screen is shown below The following table lists th...

Page 75: ...NGE DAYSOFTHEWEEK The daily schedule assigned to that specific day of the week SCH1 SCH7 Weekly Schedule Screen Weekly Schedule Definitions Daily Schedule The DAILY SCHEDULE function is used to define the times at which to change control setpoints for each of the seven available daily schedules The first screen upon entering the Daily Schedule function is an access screen which prompts the user to...

Page 76: ...elect up to 8 schedule changes per day The following example shows the standard format for all seven of the daily schedules DAILYSCHEDULE hh mm ss NUMBER SCHEDTIME GROUP 1 XX XX AM G1 2 XX XX AM G2 3 XX XX AM G3 4 XX XX AM G4 5 XX XX AM G3 6 XX XX AM G2 7 XX XX AM G1 8 XX XX AM G1 Daily Schedule 1 Screen ...

Page 77: ...The SUCTION PRESSURE CONTROL SETPOINTS screen allows the user to set up the Load and Unload Controls for Automatic capacity control The Normal Stage delay and Fast Stage Delay fields are also used for Capacity changes in the Sequenced mode Included on this screen is additional reference data to assist the operator when setting up the compressor An example of the screen is shown below SUCTIONPRESSC...

Page 78: ...ent suction pressure reference N A PRESSURE The current capacity reference N A CAPACITY RECIPMODE The current compressor mode reference N A RECIPSTATE The current compressor state reference N A Process Temperature Control Setpoints The PROCESS TEMPERATURE CONTROL SETPOINTS screen allows the user to setup the Load and Unload Controls for Automatic capacity control The Normal Stage delay and Fast St...

Page 79: ...band When it expires a stage will be added or removed as appropriate 1 999SEC FASTSTAGE The Fast Stage Delay Timer starts when the Suction DELAY Pressure exceeds the Normal Bandwidth 1 999SEC SETPOINT The current control setpoint group and value reference N A PROCESSTEMPThe current Process Temperature value reference N A CAPACITY The current Capacity reference N A RECIPMODE The current compressor ...

Page 80: ...pressor will be available to auto restart as long as the power has not been off for longer than the Power Fail Restart Delay POWERFAILRESTART This is the maximum amount of time a compressor is 0 999MIN DELAY allowed to be without power before being allowed to auto restart when the power returns ANTI CYCLETIME This is the amount of time that the compressor will be 1 30MIN able to restart after the ...

Page 81: ...of log screens please refer to the log screen section in Chapter 1 Logging Functions Technical overview The following sections will discuss the overall function of each of the five standard logs Operations Log The OPERATIONS LOG displays a list of the system operating conditions for the last hour at 30 second intervals and has a limit of 255 recorded data entries An extra entry is made to the Oper...

Page 82: ...in the log The process is repeated until the maximum of 100 entries is reached Alarms previously logged are then replaced by more recent alarms detected Failure Log The FAILURE LOG is a record of the last 100 failures When a failure first occurs a failure entry is made in the log The process is repeated until the maximum of 100 entries is reached Failures previously logged are then replaced by mor...

Page 83: ...enu options under the LOGS hot key is shown below The operator simply selects the menu item of the log they wish to access using standard menu screen operating procedures LOGS 1 VIEWLOGS 1 OPERATIONSLOG 2 TRENDLOG 3 ALARMLOG 4 FAILURELOG 5 USERLOG 2 CLEARLOGS 1 OPERATIONSLOG 2 TRENDLOG 3 ALARMLOG 4 FAILURELOG 5 USERLOG 3 CLEARALLLOG 1 NO 2 YES The following sections will provide an operating overv...

Page 84: ...he compressor is stopped The following is an example of the first page of the Operations Log This particular log has 7 different pages to display all the data PG 1 7 OPERATIONS LOG hh mm ss TIME DATE TYPE HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES HH MM SS AM MM DD YY MODES The fo...

Page 85: ...he first page of theAlarm log PG1 2 ALARMLOG hh mm ss TIME DATE TYPE HH MM SSAM MM DD YY ALARMS HH MM SSAM MM DD YY ALARMS HH MM SSAM MM DD YY ALARMS TheAlarm and Failure logs will contain the data described in the following table for each entry PARAMETER DEFINITION TIME The time the problem occurred DATE The date the problem occurred TYPE The type of problem that occurred Alarm Log Page Alarm Log...

Page 86: ... ssAM mm dd yy 01 The User log will contain the data described in the following table for each entry PARAMETER DEFINITION TIME The time the user logged onto the system DATE The date the user logged onto of the system USER User identification number Clear Logs The CLEAR LOGS function is typically not available to the user A special one time password is required from Vilter Manufacturing to access t...

Page 87: ...ge stating that the logs have been erased The action of clearing the logs requires a special password The message ACCESS DENIED indicates that the user does not have privilege to perform this function If a standard user password will not allow access to clear the logs contact your control system provider for assistance Set Log Rate The SET LOG RATES menu entry allows the user to set the rate in mi...

Page 88: ...88 ...

Page 89: ...nters a numeric user password assigned by the Viltech system manager Once a password is accepted the system allows access according to the preset restrictions set by the Viltech according to the access level Please review the Screen Access Levels section for an explanation of access levels Logoff User To logoff of the system the user selects the LOGOFF USER menu option The system then logs the use...

Page 90: ...t information from the unit Channel assignment signal name input output designation and current state of the signal are displayed for discrete I O racks ViewAnalogs The VIEW ANALOGS screens display analog signal information from the unit Channel assignment signal name current value units of measurement and hexadecimal equivalent values are displayed ViewNetworkComm The VIEW NETWORK COMM selection ...

Page 91: ...range limit is allowed to change by a maximum of 5 and the lower range limit remains constant This is referred to as a span change When the value being calibrated is in the lower zone below 33 the lower range is allowed to change by a maximum of 5 and the upper range remains constant This is referred to as an offset change When the value being calibrated is in the middle zone 33 to 66 both end poi...

Page 92: ...ss levels will range from 0 to 9 with the system manager being assigned 9 for full access The read and write features will each have their own access level with the left number being the read access level and the right number being the write access level The read access level defines the access level at which a user may view a screen The write access level defines the access level at which a user ...

Page 93: ...meters for the Modbus communications protocol Set Operating Status The SET OPERATING STATUS screen allows the user to reset the runtime and startup information of the compressor in the event that the data is lost due to a board change or factory configuration operation StagingConfiguration The SETUP STAGES screen allows the user to configure the capacity stages for the compressor The operator can ...

Page 94: ... 8 CHANNEL9 16 Two stage only 1 CHANNEL1 8 2 CHANNEL9 16 4 COMMUNICATIONS STATUS 5 OVERRIDE1 O 1 CHANNEL1 8 2 CHANNEL9 16 4 SET UP 1 SETCLOCK 2 CALIBRATE 1 DYNAMICSENSORCALIB 2 STATICSENSORCALIB 3 PASSWORDS 1 ADD DELETEUSERS 2 SCREENACCESSLEVELS 4 INITIALIZATION 1 POWERFAILRESET 2 SETFACTORYCONFIG 3 SETPOINTSAVE RESTORE 4 SAVE RESTORE STATUS 5 CONFIGURE HARDWARE 1 DISPLAY 2 COMMUNICATION 3 SET OPE...

Page 95: ...d password for a particular user 0 999999 NOTE The password is not displayed when typed Instead characters are displayed to avoid anyone overseeing the typed password Logoff User To logoff of the system the user selects the LOGOFF USER menu option A temporary screen will then appear to signal the initiation of the logoff The system then logs the user off and changes the access levels to the defaul...

Page 96: ...e user with the system options and software configuration status An example of a System Information screen is shown below SYSTEMINFORMATION hh mm ss VILTERMANUFACTURING LLC COPYRIGHT2001 VILTERStandardRecip V1 00 BUILDDATE day mm dd yy hh mm ss INITDATE day mm dd yy hh mm ss RESETDATE day mm dd yy hh mm ss CURNTTIME day mm dd yy hh mm ss OPTIONS R22 SEQ ARMT PT NETW TIMER STATUS MAX XXXXXXXXXXXXXX...

Page 97: ...TIME The current date and time for this panel OPTIONS The status of various options are shown on the lower section of the screen TIMERSTATUS The number of timers currently being used the total number of available timers and the maximum number of timers used since the last reset View Discrete I O The View Discrete I O screens are information screens used for viewing purposes only as shown in the fo...

Page 98: ...e discrete signal I O Shows whether the discrete is an input or an output STATE The current state of the discrete signal ViewAnalogs The VIEWANALOG Inputs screen can be viewed by the operator and will be displayed on a screen similar to the followingexample Discrete I O Rack 1B Screen Discrete I O Rack Definitions Analog Inputs Screen Channels 1 8 ...

Page 99: ...ous parameters displayed on the screen PARAMETER DEFINITION CH The analog channel number NAME The name of the analog signal V ALUE The decimal value of the analog input HEX The hexidecimal value of the analog input Analog Input Definitions ...

Page 100: ...he status for the optional PC or Modbus connection Master indicates the status for an optional LASTERR The last error message received from each unit The field is blank if no errors have been received TOTALERR A hexadecimal counter of the total number of errors received by each unit Time out errors do not increase the total The counter rolls over at FFFF MSGCOUNT A hexadecimal counter of the numbe...

Page 101: ...arious parameters displayed on the screen PARAMETER DEFINITION CH The discrete channel number NAME The name of the discrete signal I O Shows whether the discrete is an input or an output STATE The current state of the discrete override AUTO indicates the output is in automatic control OFF indicates that the output is de energized and ON indicates that the output is energized Override Discrete I O ...

Page 102: ... Time and Date Calibrate Sensors Password Control Initialization and Configuration Set Clock The SET CLOCK screen allows the user to change the date clock mode or time of day for the system The clock mode gives the user the ability to display time in 24 hour or 12 hour modes An example of the screen is shown below Set up Menu Screen Set Time Date Screen ...

Page 103: ...its to specify the required time All unused digits will be set to zero The colon delimiter does not need to be entered 00 00 0023 59 59 CLOCKMODE The time display mode for the system either 12 or 24 hour format 12HOUR24HOUR Calibrate Sensors The CALIBRATE SENSORS menu allows the user to adjust the range of sensor inputs There are two types of calibration Dynamic and Static Dynamic calibration is u...

Page 104: ...GF 6 SUCTIONTEMP XXX XDEGF 7 PRESS 2OPTIONAL XXX XPSIG 8 PROCESSTEMP XXX XDEGF SPANCORRECTION 0 0 OFFSETCORRECTION 0 0 The following table lists the data entry fields and a description of their purpose TERM DEFINITION CH The discrete channel number NAME The name of the discrete signal V ALUE Current dynamic value of the discrete signal UNIT The unit of measurement for the discrete signal value Dyn...

Page 105: ... X XXX X DEGF 6 SUCTIONTEMP XXX X XXX X DEGF 7 PRESS2OPTIONAL XXX X XXX X PSIG 8 PROCESSTEMP XXX X XXX X DEGF SPANCORRECTION 0 0 OFFSETCORRECTION 0 0 The following table lists the data entry fields and a description of their purpose TERM DEFINITION CH The discrete channel number NAME The name of the discrete signal V ALUE Current dynamic value of the discrete signal UNIT The unit of measurement fo...

Page 106: ...ach user can be assigned a six digit password which has associated read and write access levels The higher the access level the more privileges the individual will have on the system Read and write privileges will each have their own access level The system manager can assign read and write access levels to numerous screens on the Viltech The Viltech password protection is controlled through two s...

Page 107: ... R W 1 XXXXXX XX 6 XXXXXX XX 2 XXXXXX XX 7 XXXXXX XX 3 XXXXXX XX 8 XXXXXX XX 4 XXXXXX XX 9 XXXXXX XX 5 XXXXXX XX 10 XXXXXX XX The following table lists the data entry fields and a description of their purpose TERM DEFINITION RANGE PASSWORD The desired password for each user 0 999999 LEVEL The desired read and write levels for each user The first digit is the read level and the second is the write ...

Page 108: ...FUNCTION R W FUNCTION R W START XX MISCCONTROL XX STOP PC XX SETDATE TIME XX STOP MODEM XX CALIBRATION XX CHANGEMODES XX CHNGPASSWORDS XX SETPOINTS XX INITIALIZATION XX CAPACITYCNTRL XX CONFIGURATION XX SCHEDULING XX SETLOGRATES XX TERM DEFINITION RANGE ACCESSLEVEL The desired read and write levels for each READ WRITE user The first digit is the read level and the second is the write level The low...

Page 109: ... sections Power Fail Reset Selection of this initialization option causes the software to restart using the current setpoints as if a power failure occurred When the user selects POWER FAIL RESET a confirmation screen will be displayed asking the user to verify that he wishes to reset the system If the user answers yes the system will restart as if a power failure occurred Initialization Screen Po...

Page 110: ...system will be reset and all existing configuration changes will be lost This includes all logs set points controls modes etc Do not use this option without proper consideration of the results 2 Setpoint Save Restore This function is to be used to save a copy of setpoints from the Viltech to the eeprom of the microprocessor board 3 Save Restore Status This screen display will display that a save o...

Page 111: ...r all analog parameters and panel name The following table list the data entry fields and a description of their purpose TERM DEFINITION RANGE PRESSURE Selects the units of measure for pressure fields PSIG KPAG BAR UNITS TEMPERATURE Selects the units of measure for temperature fields DEGF DEGC UNITS PANEL Select panel name to change name of panel by NAME touching clear and using up down arrows to ...

Page 112: ... their purpose TERM DEFINITION RANGE BAUDRATE Selects the baud rate for Modbus 2400 4800 9600 19200 serial communications DATABITS Selects the number of Databits used for 7 8 communications PARITY Sets the Parity used for communications None Odd Even STOPBITS Sets the number of Stop Bits to be used 1 2 for communication Communications Screen Communications Definitions ...

Page 113: ... and a description of their purpose TERM DEFINITION RANGE TOTAL Sets the total runtime hours for the compressor 0 999999 9 HRS HOURS STARTS Sets the total number of starts since midnight today 0 999 TODAY STARTS Sets the total number of starts for yesterday 0 999 YESTERDAY STARTS Sets to total number of starts for the compressor 0 999999 TOTAL Set Operating Status Screen Operating Status Definitio...

Page 114: ... reference number used to identify the state number STAGEOUTPUT Specify if stage is an unloader ON OFF STATE open to load Only list those stages actually used CAPACITYPCT Selects the capacity for the stage 0 100 number NOTE Stages should be configured starting at Stage 1 and increasing based on the number of Capacity Control Devices available Staging Configuration Status Screen Staging Configurati...

Page 115: ...uration The following screen enables alarm and fail or fail out and selects the refrigerant AdjustContrast This screen allows you to change the contrast of the display Control Configuration Screen Adjust Contrast Screen ...

Page 116: ...connected to the microprocessor board The analog output card is to be placed on the microprocessor board towards the left center by four black holes and there is a connector labeled J5 ANALOGOUTPUT The VFD is enabled by pressing the Menu key then press the number 4 for System Setup then press number 5 for Configure Hardware and then press number 5 for Control Configuration After enabling the VFD o...

Page 117: ...h to the setpoint when the control parameter is not changing Derivative Time Adjusts the speed based on the past value 0 1000 sec of the control parameter Alarge D term may result in large fluctuations in the speed Care must be taken to keep D as low as possible Control Mode The control for the VFD Automatic Manual Tuning Automatic lets the VILTech select proper speed Manual Speed The VFD speed wh...

Page 118: ...o lock at full capacity and will start another compressor if one is available The newly started compressor is now the trim machine This process will continue until the load is under control or all compressors have been utilized If the load decreases to the point where the trim machine is no longer needed it will be stopped and control is passed back to the previous compressor The staging up and do...

Page 119: ...eadband no staging will be performed The deadband values for loading and unloading are transmitted to the compressors to be used in automatic capacity control while in sequenced mode Normal Bandwidth The load and unload bandwidths are used to define the difference between normal staging and fast staging If the difference between the system control parameter and the setpoint is outside the deadband...

Page 120: ...form an automatic stop The compressor remains on line and available for the nextsequencer operation If the anti recycle timer on the compressor has not expired the compressor will continue running in the Hot Standby state at zero percent capacity TRIM The TRIM command is sent to the compressor that has been chosen to become the trim machine This compressor will make capacity adjustments to control...

Page 121: ...arameter is below the unload deadband Stages will be removed based on the stage delay timers INCREASING The sequencer is enabled and the system control parameter is above the load deadband Stages will be added based on the stage delay timers Sequencer Lead List The compressors available to a sequencer and the order in which they are to be used are defined in the sequencer lead list The operator ca...

Page 122: ... then becomes available it will be started immediately using the Full Load command The standby monitor timer will then be started allowing the new configuration to find its proper operating point This process of starting a skipped compressor automatically maintains all running compressors in the lead list order It should be noted that a compressor becomes unavailable any time it is stopped locally...

Page 123: ...r in the high stage lead list will be forced to start and run NO HSTG The No High Stage state is an optional state used in two stage refrigeration systems If the booster sequencer needs a compressor to start but all of the high stage machines are failed or off line the booster compressors will not be allowed to start CompressorAvailability The sequencer is continuously checking the status of all c...

Page 124: ...ing of control groups based on time of day and day of the week Control setpoint groups and the selected lead list can be changed using scheduling The operator can define up to seven 7 different daily time schedules and one weekly schedule Sequencer scheduling can be enabled or disabled by the operator All schedule changes are relayed to the compressors and take effect auto matically Daily Schedule...

Page 125: ...ON position for the correct binary sum value that corresponds to that number of trim panels Then the dip switches on the trim panels must be set up sequentially in the order that each will turn on by the command of the master For example if there is a master and 3 trim compressors then dip switch 1 2 and 8 are in the ON position and the trim compressors will have their own unique address starting ...

Page 126: ...he staging timer SUCTIONPRESS The current value of the system suction pressure for system process temperature GROUP Shows the current control group being used SETPOINT The current setpoint value utilized by the sequencer Engineering units will change to DEGF if Process Temperature is being used LEADLIST Status Shows the currently selected lead list number and the value of the standby monitor timer...

Page 127: ...uencer setup selections will be available Additional menu selections for control setpoints control groups and high alarm setpoints are present if the system contains multiple system control parameters SEQ 1 SEQUENCERCONTROL 2 SETPOINTS 3 LEADLIST 4 CNTRLGROUPSELECT 5 SCHEDULING 1 SCHEDULESETUP 2 DAILYSCHEDULE 1 SCHEDULE01 2 SCEHDULE02 1 SCHEDULE07 6 HIGHALARM SEQ Menu Diagram ...

Page 128: ...tarts after lead list changes or when previously failed compressors are brought back on line The Sequencer Control Setpoints screen is divided into four areas The Sequencer Controls section at the top controls how the sequencer decides when to start or stop compressors The Compressor Controls section in the center is passed to the Trim Compressor to allow it to load and unload at a different rate ...

Page 129: ...load control 0 20 PSID deadbands define a zone around the setpoint where no staging action will be taken SEQNORMALSTAGEDELAY The sequencer normal stage delay is 0 99 MIN used to add or remove stages when the difference between the system control parameter and the setpoint is outside the deadband but within the normal bandwidth Entering a zero for the load or unload normal stage delay time disables...

Page 130: ...int where no loading or unloading will be performed STANDBYMONITORTIMER The standby monitor timer is used to limit 0 1 99 9 MIN compressor starts after lead list changes or when previously failed compressors are brought back on line HSTGSUCTPRESSMINSETPT This optional parameter may be used in 29 9INHG 185 3PSIG OPTION the Booster stage of two stage refrigeration systems The High Stage Suction Pres...

Page 131: ... most new control systems Lead ListAor B may be selected manually or scheduled along with the sequencer control setpoint The following table lists the various parameters displayed on the sequencers lead list screen TERM DEFINITION RANGE LEADLISTA The order of compressors in the A lead list Selectable LEADLISTB The order of compressors in the B lead list Selectable CURRENTACTIVE Allows the user to ...

Page 132: ...yed on the sequencer suction pressure control group select screen The range of these parameters will vary depending on the type of system control parameter used TERM DEFINITION RANGE CONTROLSETPT The sequencer will add or remove compressors to 29 9INHG maintain the system control parameter at this 185 3PSIG control setpoint LOWALARM An alarm is activated when the system control 29 9INHG parameter ...

Page 133: ...equencer setup screen TERM DEFINITION RANGE SEQUENCER Enables or disables scheduling Selectable SCHEDULING CURRENTACTIVE Overrides the current active lead list Selectable LEADLIST CURRENTACTIVE Overrides the current active group Selectable GROUP CURRENTACTIVE Overrides the current active schedule Selectable SCHEDULE WEEKL Y Allows one of the seven dailly schedules to each Selectable SCHEDULE day o...

Page 134: ...data entry fields and description of their purposes TERM DEFINITION RANGE SCHEDULEDTIME The time schedule change will take place ValidTime of Day entered in 12 or 24 hour mode SELECTEDGROUP The control group number to be used at this Selectable time SELECTEDLEAD The lead list to be used at this time Selectable LIST Sequencer Daily Schedule Screen Definitions Sequencer Daily Schedule Screen ...

Page 135: ...s for each parameter An example of the high alarm setpoints screen is shown below The following table lists the data entry fields and description of their purposes TERM DEFINITION HIGHFAILURE If the system control parameter is above this value a failure will be reported HIGHALARM If the system control parameter is above this value an alarm will be reported Sequencer High Alarm Screen Definitions S...

Page 136: ...ill be closed and the compressor should pump down and shutoff normally when the Suction Pressure falls below the Cut Out setpoint But if the Remote Start Stop input is de energized the Liquid Valve will be closed right away but the compressor will be allowed to pump down and shutoff normally when the Suction Pressure falls below the Cut Out setpoint Other operations are still allowed likeAutomatic...

Page 137: ...ken from Group 2 The following Hardware needs to be installed for the Pump Down program to function Process Temperature input Analog Channel 8 is the Alcohol Temperature from another control system The Remote Start Stop input from DCS is used to control enabling disabling the process when the RMT button on the panel is used to start the process Spare I O Channel 16 will be fitted with a solid stat...

Page 138: ...138 ...

Page 139: ...Alarm 215DEGF 9 High Discharge Temperature OEM 212DEGF 10 High Discharge Temperature Fail 212DEGF 11 High Discharge Temperature Alarm 200DEGF 12 High OilTemperature OEM 180DEGF 13 High OilTemperature Fail 155DEGF 14 High OilTemperature Alarm 140DEGF 15 Low Oil Pressure Alarm 15PSIG 16 Low Oil Pressure Fail 10PSIG 17 Low Oil Pressure OEM 10PSIG 18 Low Intermediate Temp Two Stage Fail 50DEGF Spare O...

Page 140: ...ntermediate Pressure Two Stage Fail 40PSIG Spare One Stage DiscreteAlarms The Micro checks the state of the Motor Output and Aux Input To verify correct operation Aux contact closed indicates the motor is running If Motor is running when it should be off the Micro will take the following steps 1 Failure signal is generated to alert operator 2 Capacity is forced to a full unload condition ...

Page 141: ... O RACK 1 TYPE CHANNEL NAME OFFSTATE ON STATE NOTES Output 1 Compressor Motor Off On Output 2 Capacity Stage 1 Off On Output 3 Capacity Stage 2 Off On Output 4 Capacity Stage 3 Off On Output 5 Capacity Stage 4 Off On Output 6 Spare Off On Output 7 Spare Off On Output 8 Alarm Failure Norm Alarm Input 9 MotorAUX Open Closed 1 Input 10 AUX Shutdown Alarm Norm 3 Input 11 Safety Circuit Alarm Norm 3 Ou...

Page 142: ...142 ...

Page 143: ...ossible using a RS 485 or RS 422 multi drop interface NOTE Modbus is a registered trademark of Modicon Inc Real time monitoring of the following data is provided Analog input parameters Discrete I O parameters Mode and State information Computed parameters Alarm Information Real time control of the following parameters is provided Compressor Control including start stop and mode changes Compressor...

Page 144: ...ound 5 RX Receive Data Negative 6 RX Receive Data Positive NOTE For RS 485 communications use Terminals 1 and 2 for the network connection and add a jumper between Terminals 1 6 and 2 5 The use of low capacitance twisted shielded cable is required e g Belden 9503 or eq The shields should be grounded at the master computer end of the cable and floated at the microprocessor end Figure 1 shows the in...

Page 145: ...145 ...

Page 146: ...number is initially set using dip switch SW1 on the main microprocessor board However the actual unit number can be changed through software by setting the Modbus unit number on the appropriate set up screen on the controller The following table shows the dip switch settings for up to 31 individual RECIP compressors ...

Page 147: ...147 ...

Page 148: ...ch will respond to all message types The Status and Control option is selected by enabling Modbus communications on the Communications Setup screen To allow setpoints to be changed select Yes for the Allow Network Control selection If network control is not allowed Status Only is selected and an error response will be returned whenever a control message is attempted When network control is allowed...

Page 149: ...de 03 0x03 Read Holding Registers Function code 06 0x06 Preset Single Register Function Code 16 0x10 Preset Multiple Registers Other Modbus message types may become available later or if the need arises A brief description of the format for each function code will be provided below However for a more thorough explanation please refer to the Modicon Modbus Protocol Reference Guide PI MBUS 300 Read ...

Page 150: ...ntrol Setpoint to 0 PSIG 14 7 PSIA using Modbus word address 40202 Preset Multiple Registers The Preset Multiple Registers function code 0x10 is used to change the contents of one or more registers within the Viltech controller Any group of registers within the Control Message and Setpoint Messages may be changed as long as the number of registers addressed does not extend beyond the valid range T...

Page 151: ...1273 decimal or 04F9 hex Negative numbers are stored in two s complement form For example 237 4 would be stored as 2374 decimal or F6BAhex The Discrete I O parameters are transmitted in a packed binary format where each bit represents an individual input or output Data marked as optional only applies to RECIP compressors with optional equipment installed The Alarm data includes all alarm failure a...

Page 152: ... particular compressor depending on optional equipment and features The Status Message includes the following types of data 16 bit analog input parameters from sensors 16 bit derived or computed parameters Discrete input and output data in packed bit format Alarm data in packed bit format Compressor mode and state data Analog Inputs and Computed Parameters 414 5 414 5 PSIA PSIA ...

Page 153: ...153 ...

Page 154: ...154 Alarm and Failure Data ...

Page 155: ...155 Alarm and Failure Data Continued ...

Page 156: ...156 Alarm and Failure Data Continued ...

Page 157: ...ata Alarm Status Table Bits 7 6 5 4 3 2 1 0 X X X X X X X X AlarmActive FailureActive Alarm is Non Fatal Failure is Non Fatal AlarmAcknowledge NewAlarmAcknowledge New FailureAcknowledge Not Used Compressor Mode Table ...

Page 158: ...158 Compressor State Table ...

Page 159: ...159 Last RECIPStart Status Table ...

Page 160: ...trol Message are shown in the following table and described further in the paragraphs below NOTE The Control Message may not be written unless the Allow Network Control selection is set to Yes Commands other than Network In Control can only be written once the Network In Control Command has been issued NOTE The data described by each register may be slightly different depending on if the register ...

Page 161: ... the compressor is Online A value of 3 will stop the compressor with a failure indication and take it Offline This command is intended to be used by the master for system safeties High Level Shutdown NH3 detection etc A value of 4 will put the compressor Online The Start and Online commands are also used in conjunction with the Auto Start Stop Control to allow the compressor to Cut In and Cut Out ...

Page 162: ...o maintain the current active setpoint Change Compressor Capacity Command The Change Compressor Capacity command allows the master to force the compressor to load or unload This command word is only processed when the compressor is in the Remote mode When set to 1 or 2 the compressor will load or unload respectively Each time the command is written a single stage will be added or removed When read...

Page 163: ...8 for Sequenced NOTE This may or may not actually affect the system capacity depending on the current mode of the compressor For example automatic capacity control is not performed in the Manual Mode Auto Start Stop Control Command Change Control Type Command The Change Control Type Command is used to switch automatic control between Suction Pressure and Process Temperature operation NOTE The Proc...

Page 164: ...uction Pressure setpoints may be read or written individually or in groups The master is responsible for setting the correct starting address number of registers and the register data for the message block NOTE Setpoints may not be changed unless the Allow Network Control selection is set to Yes and the Network In Control Command has been issued in the Control Message Note DF1 is NOT used ...

Page 165: ...ss Temperature control option is enabled Process Temperature setpoints may be read or written individually or in groups The master is responsible for setting the correct starting address number of registers and the register data for the message block NOTE Setpoints may not be changed unless the Allow Network Control selection is set to Yes and the Network In Control Command has been issued in the ...

Page 166: ...n displays status information on the mode of the condenser con troller and the stage of the condenser Modes Of Operation The Condenser Controller always starts in the OFF position The Controller has two modes of operation The mode is changed by selecting the preferred mode on the main screen The modes of operation are as follows 1 Automatic Starting and Stopping will be performed automatically bas...

Page 167: ...hese points see Auto Setup Screen section of this manual Automatic Operation In automatic mode the Condenser Controller will attempt to keep the Dis charge Pressure within the deadband range Once the discharge pressure moves outside the specified dead band range the Controller will wait the specified amount of seconds and toggle the appropriate stage The Main Screen will state the appropriate stag...

Page 168: ...the Ent button to return to the Auto Setup Screen Pressure value can not exceed three digits and should always stay within safe operating conditions specified by the condenser manufacture Deadband value can not exceed three digits and should always stay within safe operating conditions specified by the condenser manufacture Timer Set value can not exceed two digits and should stay within safe oper...

Page 169: ... the Manual Override Screen touch the MANUAL OVERRIDE but ton In the Manual Override Screen you can operate each stage individually To operate a given stage touch the corresponding toggle button When the specified stage is selected the light will become illuminated as well as the toggle button itself and shut off a specified stage touch the corresponding toggle button When the specified stage is n...

Page 170: ...the steps selected Entering into Auto Mode or Off Mode from the Main Screen will shut off the stages until you enter Manual Mode again When the operator enters back into Manual Mode the stages selected in the Manual Override screen will begin to run again Communication Failure If the HMI looses communications with the Processor a COM Port Open Failed message will appear on the screen as shown belo...

Page 171: ...171 Condenser operation will no longer be controlled by the HMI The operator will have to control the stages at the motor starter by using either HAND or OFF ...

Page 172: ...172 ...

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Page 174: ...35391VT Rev 4 7 13 Emerson and Vilter are trademarks of Emerson Electric Co or one of its affiliated companies 2012 Emerson Climate Technologies Inc All rights reserved Printed in the USA ...

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