SERIES 70 SERVO NXT - MODULATING CONTROLLER
SERIES 70SERVO NXT - MODULATING CONTROLLERInstallation, Operation and Maintenance Manual03/30/21H1 seoc.ldH1 seoc.ldBRAY.COMTHE HIGH PERFORMANCE COMPANY
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Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance ManualTable of Contents1. Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22. Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.1 Hazard-Free Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.2 Qualified Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23. Description of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34. User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1 Product Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1.1 Changing Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.1.2 Description of Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.1.2.1 Input Signal Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.1.2.2 Output Signal Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1.2.3 Failure Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1.2.4 Close Speed Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1.2.5 Open Speed Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1.2.6 Dead Band Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1.2.7 Torque Switch Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1.2.8 Reverse Acting Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1.3 Motor Stall Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.2 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.2.1 Remote Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.2.2 Local Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.2.3 Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.2.4 Autocalibration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.3 Status Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.3.1 Valve Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.3.2 Fault Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.3.3 Bray Logo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85. Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1 Terminal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.1 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.2 Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.3 Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.4 Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.5 Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1.6 FB Pot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1.7 Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1.8 Hand Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1.9 Torque Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1.10 Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106. Quick Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117. Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual1. Definition of TermsREAD AND FOLLOW THESE INSTRUCTIONSSAVE THESE INSTRUCTIONSWARNINGindicates a potentially hazardous situation which, if not avoided,could result in death or serious injury.CAUTIONindicates a potentially hazardous situation which, if not avoided,may result in minor or moderate injury.used without the safety alert symbol indicates a potential situationNOTICE which, if not avoided, may result in an undesirable result or state,including property damage.2. Safety2.2 Qualified Personnel2.1 Hazard-Free UseThis device left the factory in proper condition tobe safely installed and operated in a hazard-freemanner. The notes and warnings in this documentmust be observed by the user to ensure hazard-freeoperation of this device.All necessary precautions need to be taken toprevent damage due to rough handling, impact, orimproper storage. Do not use abrasive compoundsto clean the device, or scrape its surfaces with anyobjects.Configuration and setup procedures for this deviceare described in this manual. Proper configurationand setup are required for the safe operation ofthis device.The control system in which this device is installedmust have proper safeguards to prevent injury topersonnel, or damage to equipment, should a failureof system components occur.WARNINGEquipment controlled by the device can generatelarge mechanical forces during normal operation.2WARNINGThe device must only be installed, commissioned,operated and repaired by qualified personnel.Installation, commissioning, operation andmaintenance of the device must be performedunder strict observation of all applicable codes,standards and safety regulations.As per this document, a qualified person is onewho is trained in: The operation and maintenance of electricequipment and systems in accordance withestablished safety practices. Procedures to energize, de-energize, ground,tag and lock electrical circuits and equipmentin accordance with established safety practices. The proper use and care of personal protectiveequipment (PPE) in accordance with establishedsafety practices. First aid.
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual3. Description of OperationThe Bray Series 70 Servo NXT provides completemodulating control and monitoring of the BraySeries 70 Electric Actuator. The basic function ofthe Servo NXT is to position the S70 Actuator inresponse to a command signal from a processcontroller. The process controller contains a desiredprocess set point entered by the user, and continuallymonitors the process variable (such as flow rate,tank level, etc.) through some type of sensor.Varying the command signal to the Servo NXT willcause the actuator to change position, which willmove the associated control valve to modify theprocess variable. The process controller continuallycalculates and transmits the appropriate commandsignal to the Servo NXT to maintain the process atthe desired set point.The command signal to the Servo NXT can be variousDC voltage ranges (0-5V, 0-10V, 2-10V) or a 4-20mAcurrent source. The Servo NXT simultaneouslyprovides a feedback output signal, representingthe current actuator position. The retransmissionoutput signal reported by the Servo NXT can alsobe various DC voltage ranges (0-5V, 0-10V) or a4-20mA current source. These settings along withspecific operating modes are enabled by a simpleto-use configuration menu.4. User InterfaceThe Servo NXT features a rich, LED-based menu thatdisplays both configurable settings and operationalstatus. Indicators are grouped together based onfunction, shown by their respective label(s). Withoutany user interaction, the Servo NXT will displaythe factory default product settings, in addition tomode of operation, valve position, and fault status.4.1 Product SettingsThe product settings determine how the ServoNXT will respond to commands from the processcontroller. These must be defined and verifiedbefore operation begins. The settings that can beadjusted on the Servo NXT are, in clockwise order: “Input” – Input Command“Output” – Output Command“Fail” – Failure Position“Close Speed” – Close Speed Control“Open Speed” – Open Speed Control“Dead Band” – Dead Band Control“Torque Switch” – Torque Switch Detection“Reverse Acting” – Reverse Acting ModeAll units ship with default settings from the factory.FeatureSettingInput Command4-20mAOutput Command4-20mAFailure PositionLastOpen Speed Control100%Close Speed Control100%Dead Band Control3%Torque Switch DetectionOffReverse Acting ModeOffFigure 1: Servo NXT default settingsFigure 2: Servo NXT Menu3
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual4.1.1 Changing SettingsSettings can be changed locally by utilizing thekeypad on the Servo NXT. The keypad is located onthe right side of the unit, and the keys are labelledbased on the operation performed. Up arrow - Cycles the cursor (see below) in acounter-clockwise direction Down arrow - Cycles the cursor in a clockwisedirection Check mark - Activates the selected setting (ifapplicable) and saves the current configurationSettings are changed using the cursor, visualizedby a flashing indicator. To produce the cursor, theup or down arrow key must be pressed, causingone of the setting indicators to flash. Pressingor holding the Up or Down Arrow will move thecursor in the respective direction, as illustrated inFigure 3. Producing the cursor does not alter anysettings without further user input, and the cursorwill automatically timeout if the keypad is not used.Once the cursor has been positioned over a desiredsetting, pressing and holding the check mark for 1second or more will activate the selected setting.Attempting to activate a setting that is alreadyactive will have no additional effect.4.1.2 Description of Settings4.1.2.1 Input Signal TypeInput signals position the valve under control,based on the magnitude of the signal. Duringnormal operation, the minimum value correspondsto the close position and the maximum value tothe open position. Reverse Acting Mode invertsthis relationship (maximum value close position,minimum value open position). Only one inputsignal can be active at a time.Input setting4-20mA (default)0-10V0-5V2-10V4DescriptionAnalog Current RangeMinimum: 4mAMaximum: 20mAAnalog Voltage RangeMinimum: 0VMaximum: 10VAnalog Voltage RangeMinimum: 0VMaximum: 5VAnalog Voltage RangeMinimum: 2VMaximum: 10VFigure 3:Servo NXTInput settings
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual4.1.2.2 Output Signal Type4.1.2.5 Open Speed ControlOutput signals report the position of the valve undercontrol, based on the magnitude of the signal. Theminimum value corresponds to the close positionand the maximum value to the open position. Onlyone output signal can be active at a time.Open Speed Control determines how quicklythe Servo NXT operates the actuator in the opendirection. This value is a percentage of the fullspeed. The illuminated indicators act as a levelgauge: activating a speed setting illuminates alllower speed setting indicators. Maximum speedilluminates all indicators, while minimum speedilluminates only one.Output setting4-20mA (default)0-10V0-5VDescriptionAnalog Current RangeMinimum: 4mAMaximum: 20mAAnalog Voltage RangeMinimum: 0VMaximum: 10VAnalog Voltage RangeMinimum: 0VMaximum: 5VFigure 4 - Servo NXT Output settings4.1.2.3 Failure PositionThe Failure Position determines how the ServoNXT positions the valve upon loss of input signal.Loss of input signal occurs when the input signalreceived is outside the valid range of the selectedInput Signal Type, e.g. an input signal of less than4mA for the 4-20mA input. Only one failure positioncan be active at a time.Fail setting:CloseOpenLast (default)Description:Valve is closed on loss of input signalValve is opened on loss of input signalPosition valve at the last validcommanded position before loss ofinput signalFigure 5 - Servo NXT Fail Settings4.1.2.4 Close Speed ControlClose Speed Control determines how quicklythe Servo NXT operates the actuator in the closedirection. This value is a percentage of the fullspeed. The illuminated indicators act as a levelgauge: activating a speed setting illuminates alllower speed setting indicators. Maximum speedilluminates all indicators, while minimum speedilluminates only one.Close Speed SettingDescription0% - 100% (default)Step size: 20%Actuator close speedas a percentage of fullspeedOpen Speed SettingDescription0% - 100% (default)Step size: 20%Actuator open speedas a percentage of fullspeedFigure 7 - Servo NXT Open Speed Setting4.1.2.6 Dead Band ControlDead Band Control determines the acceptableoffset between the position command providedby the input command and the current positionof the actuator, determined from the feedbacksignal provided by the potentiometer. This value isa percentage of the full input range, and createsan inactive area centered around the desired setpoint. For example, for a 0-10V input command, a2% Dead Band Control setting allows the actuatorposition to be offset from the desired set point byup to 0.1V in either direction, creating a dead bandwith a span of 0.2V. The illuminated indicators actas a level gauge: activating a dead band settingilluminates all lower dead band setting indicators.Maximum dead band illuminates all indicators,while minimum dead band illuminates only one.Dead Band SettingDescription1% - 6%3% (default)Step size: 1%Acceptable offsetbetween commandposition and actuatorpositionFigure 8 - Servo NXT Dead Band SettingFigure 6 - Servo NXT Close Speed Setting5
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual4.1.2.7 Torque Switch Detection4.1.3 Motor Stall DetectionTorque Switch Detection determines whether theServo NXT is responding to changes to the torqueswitch assembly. When on, the Servo NXT will stopthe actuator if a torque switch is engaged, signalingthat the actuator is operating at torques above itsrated torque. This setting should only be activatedif torque switches are connected to the Servo NXT.A standard feature on the Servo NXT is motor stalldetection. If the feedback signal provided to theServo NXT by the potentiometer does not match theexpected operation, then a fault state is entered.More specifically, if the actuator controlled by theServo NXT is operating the motor either open orclose and the feedback potentiometer does notdetect any movement, a Motor Stall Fault willoccur. This most often occurs when the travel ofthe actuator is impeded due to excessive valvetorque or a blockage in the valve flow stream.When a Motor Stall Fault occurs, the actuatorwill move in the opposite direction of travel fromwhere the fault occurred for 2 seconds. This relievesthe actuator and underlying valve from any statictorque load. After this movement, the actuator willstop and continuously flash all five fault indicatorssimultaneously. The actuator will not respond tofurther commands and will remain in this state untilthe handwheel is engaged. After the handwheelis engaged and then disengaged, the actuator willresume normal operation.In rare cases, it may be desirable to disable thisfeature. The Motor Stall Detection feature can bedisabled by simultaneously pressing and holdingthe Up and Down Arrow keys for 5 seconds. After5 seconds, all valve position indicators will flashsimultaneously for 1 second indicating that thefeature has been disabled. The feature can bere-enabled by repeating the process. When thefeature is re-enabled, the 5 fault indicators willflash simultaneously for 1 second.NOTE: It is suggested that the Motor StallDetection is disabled when the Servo NXT isinstalled in size 130 and 180 S70 actuators dueto the slower operating speed.Torque Switch SettingDescriptionOnActuator movementstopped if the torqueswitch engagesOff (default)Torque switch stateignoredFigure 9 - Servo NXT Torque Switch Settings4.1.2.8 Reverse Acting ModeReverse Acting Mode determines how the ServoNXT responds to input commands. When on, theServo NXT will operate inversely to how it operatesnormally, treating the maximum input signal value asthe close command and the minimum input signalas the open command. This setting does not affectthe output signal.Reverse Acting Setting DescriptionOnServo NXT respondsinversely to inputcommandsOff (default)Servo NXT respondsnormally to inputcommandsFigure 10 - Servo NXT Reverse Acting Mode Settings6
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual4.2 Operating Modes4.2.1 Remote ModeBy default, the operating mode of the Servo NXT isremote mode, where the valve is positioned basedon input signals. Exiting another mode of operationgenerally results in the Servo NXT returning toremote mode.4.2.2 Local ModeLocal Mode is entered if a connection is made tothe Control Box terminals and a command signal ispresent. This allows the Servo NXT to be controlledby a local control box, mounted to or near theactuator. See the section on the control box formore information.4.2.3 Manual ModeThis operating mode allows for the actuator tobe controlled directly from the user interface onthe Servo NXT. By utilizing the keypad, the usercan change the position of the valve with a singlebutton press.Manual mode is exited in the same way it is entered:by pressing and holding the manual mode buttonfor 1 second. While in manual mode, the indicatornext to the manual mode button remains lit. Manualmode can only be entered during remote operation. Up arrow – Energizes the actuator in the opendirection. The actuator will operate until it reachesthe end of travel or the user presses the checkmark key. Down arrow - Energizes the actuator in theclose direction. The actuator will operate until itreaches the end of travel or the user presses thecheck mark key. Check mark – Sets the current actuator position asthe command position. If the actuator is energizedwhen the button is pressed, then it stops in place.4.2.4 Autocalibration ModeThe Servo NXT uses an automated calibrationsequence to determine the operating pointsfor the application in which it is installed. Theseoperating points allow the Servo NXT to calculatethe correct feedback position of the product,making autocalibration an important step duringcommissioning. Servo NXT units that have notbeen calibrated will flash the indicator next toautocalibration button to show that they are usingdefault values for calculating position.Autocalibration mode is entered by pressing andholding the Autocalibration button for at least3 seconds. While in autocalibration mode, theautocalibration indicator remains lit. In addition,the product settings’ indicators will change stateto show that autocalibration has been entered,and will continue to flash at the end of traveluntil autocalibration completes. Upon completionof the autocalibration sequence, the productsettings’ indicators will return to normal and theautocalibration indicator will remain lit, indicatingthat the new parameters have been stored.No other operating modes can be entered duringautocalibration, and entering autocalibration modewill override any previous mode of operation.NOTICEIf the fault indication lights illuminate duringautocalibration, then the autocalibration sequencecould not be successfully completed. Upon failureof autocalibration, the autocalibration indicatorwill continue flashing to indicate that defaultparameters are still being used for positioning.Refer to the troubleshooting section for moreinformation.CAUTIONThe Servo NXT will not be remotely ocalibration needs to be aborted, engage(pull out) the handwheel.4.3 Status IndicationThese are all indicators that report key informationon the operation and functional status of the ServoNXT and actuator.4.3.1 Valve PositionThis string of indicators provides positioninformation of the valve under control. In addition,if the actuator is operating the valve, then it alsoindicates the current command position anddirection of travel. Direction indicators – The Open (green) andClose (red) indicators at both ends of the valveposition indicator show the current directionof travel. When the actuator is energized, thecorresponding indicator will flash to indicatetravel. The green indicator will be lit if the opentravel limit is reached. The red indicator willremain lit if the close travel limit is reached. Position indicators – The indicators betweenthe direction indicators act as a level gauge,7
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance ManualFigure 11: 120VAC / 230VAC Servo NXT terminal labels8Refer to the Troubleshooting section for the actionsrequired to clear a fault.4.3.3 Bray LogoOpenCloseComComOpenCloseThe indicators that illuminate the Bray logo in thelower right of the user interface serve as statusindicators for the Servo NXT. No matter whatoperation is performed, these indicators should beflashing on and off. If they are not flashing, refer tothe Troubleshooting section.OpenHWNeutComOpenComOutput -Live 3.3VOutput CloseWiperInput -NeutComInput Limit Switch – Both travel limit switches have beenengaged, preventing the actuator from operating,or the travel limit switches are not correctly wiredIn addition, all the fault indicators can be flashingin unison. During autocalibration, this means thatthe autocalibration sequence has failed. Duringnormal operation, this indicates that a motor stallfault has occurred. Refer to the section on MotorStall Detection for more detail on a motor stall fault.Com Cmd Signal – A valid input command is not present. Torque Switch – A torque switch has beenengaged, or the torque switches are not correctlywired to the Servo NXT.NeutThe Fault Status indicators are, from left to right: FB pot – The feedback potentiometer is outsideits range of travel or is not correctly wired to theServo NXT.ComThese indicators in the lower left of the user interfaceilluminate in the event of a fault. The occurrence ofa fault generally indicates that user intervention isrequired to restore operation, and these indicatorsattempt to provide the diagnostic information neededto accomplish this. Hand Wheel – The actuator handwheel has beenengaged (pulled out), or the handwheel switch isnot correctly wired to the Servo NXT.Close4.3.2 Fault Statusto the Servo NXT.Livewith the fully closed position serving as the zeropoint. Each indicator represents 15 degrees oftravel, so that the total number of illuminatedindicators shows the distance the valve is fromthe fully closed position. As the command signalis changed, a single indicator will flash whichrepresents the relative level of the commandsignal. The indicators that remain solid representthe relative position of the actuator. Once theactuator reaches the command signal set point,the single command signal indicator will stopflashing. This scheme provides the operatoran indication of both the command signal andactuator position using a single display.
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance Manual5. Hardware Description5.1.1 Power5.1 Terminal ConnectionsPower connection that energizes the Servo NXTand powers the actuator under control. The voltagesupplied should be based on the actuator nameplatevoltage and the voltage listed on the Servo NXT label.WARNINGTurn off all power and lockout/tag out servicepanel before installing or modifying any electricalwiring.Terminals are provided on the unit for the landingof stripped wires, connecting the Servo NXT tothe external sources and signals needed for it tosuccessfully operate. These terminals are positionedon the unit based on physical location of theconnecting components and the voltages expectedat the connection. There are two categories thatthe terminal connections fall into: high/low voltageand customer/actuator connection. Connectionsof differing voltage levels are differentiated bytheir height on the Servo NXT, with high voltageconnections being near the bottom of the unitand low voltage connections being near the top.Similarly, the customer and actuator connections arepositioned such that they are easily accessible oncethe Servo NXT is installed in an actuator. Actuatorconnections are generally made at the factory,and should not require any customer adjustment.All connections required for proper operation arebolded age( 15V)PowerHeater,MotorLowvoltage( 15V)Input Signal(Input , Input-)Output Signal(Output , Output-)FB Pot,Control Box,Hand Wheel,Torque Switch,Limit SwitchFigure 12: Terminal Connection categoriesNOTICERefer to the actuator wiring diagram for wiregauge, torque, voltage, and temperature limitsof the terminal blocks. All actuator connectionsshould match the actuator wiring diagram.CAUTIONVerify that the actuator nameplate voltageand the Servo NXT label voltage match beforeproviding power to the unit.The Servo NXT has an onboard protective fusethat is in line with the input power connection.This protective fuse is rated to 5A, the maximumallowable current draw for the Servo NXT. Therefore,the power supply connected to the input powerconnection should be rated to provide at least thismuch current to each Servo NXT.5.1.2 HeaterIf the actuator has an internal heater, then the heaterwires are terminated at this connection. The heaterwill be powered by the input power connection.Only Bray supplied heaters should be connectedto the Servo NXT.5.1.3 MotorConnections for the motor that operates theactuator. Refer to the actuator manual for moreinformation on the motor.5.1.4 Input SignalConnection for the input signal that positions thevalve under control, based on the magnitude of thesignal. The signal that is present at this connectionshould be based on the input setting (see ProductSettings).Input signals are polarized, so that miswiring mayresult in unexpected behavior. Ensure that the wiringdiagram is followed when making this connection.5.1.5 Output SignalConnection for the output signal that reports theposition of the valve under control, based on themagnitude of the signal. The signal that is presentat this connection is based on the output setting(see Product Settings).Output signals are polarized, so that miswiring mayresult in unexpected behavior. Ensure that the wiringdiagram is followed when making this connection.9
Series 70Servo NXT - Modulating ControllerInstallation, Operation and Maintenance ManualNOTICEThe output signal is powered by the Servo NXT.An external source should never be connected tothe terminals.5.1.6 FB PotConnections for the Feedback Potentiometer,used by the controller to determine the positionof the valve.The Servo NXT provides a logic level voltage acrossthe potentiometer, and then monitors the voltagethat is returned on the wiper connection. Thewiper voltage will change as the potentiometer isturned, due to the rotation of the cam shaft. Duringautocalibration, the Servo NXT can save the wipervoltage range and use it to position the actuatoraccurately and precisely.NOTICEThe Servo NXT has been programmed to monitora specific range of feedback voltage. Utilizing apotentiometer other than the factory providedpotentiometer may result in unexpectedbehavior.NOTICEServo NXT feedback potentiometer voltagemay be measured between terminals “C” and“PW”. Voltage must be between 0.1 Volts and3.1 Volts for valve closed and opened positionsrespectively. Refer to the S70 Electric ActuatorIOM for potentiometer alignment instructions.5.1.7 Control BoxConnections for the local control station, if present.The local control station allows for local operationof the actuator, putting the Servo NXT in local modeand overriding remote input commands.The Servo NXT provides a logic level voltage atthe Ope
Mar 30, 2021 · up to 0.1V in either direction, creating a dead band with a span of 0.2V. The illuminated indicators act as a level gauge: activating a dead band setting illuminates all lower dead band setting indicators. Maximum dead band illuminates all indicators, while minimum dead band illuminates only one. Dead
When the PC identifi es the NXT it will automatically fi nalize the installation of the LEGO MINDSTORMS NXT Software. Connecting the NXT to a Macintosh with a USB cable Make sure that the LEGO MINDSTORMS NXT Software is installed before connecting your NXT to your Macintosh (see page 39). Turn on your NXT. Connect the USB cable to the NXT.
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