Motortronics DXT Series Starter Installation & Operation Manual

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DXT Series39 - 1250AMOTORTRONICS Solid State AC Motor ControlDXT SeriesDigital Solid StateSoft StarterINSTALLATION & OPERATIONMANUALPhone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXTDXTSeriesSeriesDigital Solid StateSoft Starter39 - 1250AInstallation &Operation ManualChapter 1: Introduction .139 - 1250A1. of OperationGeneral ProtectionThermal Overload ProtectionChapter 2: Installation . and UnpackingInitial Unit InspectionLocationMounting & CleaningPower Wire Range and Tigtening TorqueDimensionsPower ConnectionsControl ConnectionsReference SectionChapter 3: Start-Up . Start-up Check ListIntroductionAcceleration AdjustmentsDeceleration AdjustmentsSequence of Normal OperationChapter 4: User Interface and Menu Navigation . 204.14.2Keypad/Operator InterfaceMenu NavigationChapter 5: Setpoint Programming . 235 .15.2Setpoints Page ListSetpoint MenuSP.1 Basic Configuration . 33SP.2 Starter Configuration . 34SP.3 Phase & Ground Settings . 37SP.4 Relay Assignment . 40SP.5 Relay Configuration . 42SP.6 I/O Configuration . 43SP.7 Custom Acceleration Curve . 46SP.8 Overload Curve Configuration . 49SP.9 RTD Configuration . 50SP.10 Set Password . 51SP.11 Communications . 52SP.12 System Setpoints . 54SP.13 Calibration & Service . 56Chapter 6: Metering Pages . 576 .1Metering Page ListChapter 7: Maintenance and Troubleshooting . 677. AnalysisSCR Testing ProcedureReplacing SCR devicesReplacing the Main Control BoardInterconnect DrawingAppendix A: Reference Section . 76Appendix B: Record of Setpoint Adjustments . 79Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250AChapter 1 - IntroductionThis chapter is a brief introduction to the DXT Series soft starter and describesproduct operation and unit features.1.1 - GeneralThe DXT Series is a high-end digitally programmable solid state reduced voltage softstarter. This heavy duty starter provides reduced voltage, stepless soft starting of 3phase AC induction motors, protecting mechanical components from excessivetorque stress and electrical systems from the effects of high motor inrush currents.The DXT Series includes advanced motor and load protection features just like thosefound in expensive motor protection relays. These include retentive thermal memory,dynamic reset capacity, true thermal modeling, separate trip curves for start and runprotection, overload alarm, etc. But in the case of the DXT Series, these features arebuilt in as standard features, providing a cost effective and reliable motor starting andprotection scheme for your critical motor applications.The DXT Series features an easy to use interface operator for programming andstatus indication. It includes a large tactile feedback keypad, LED status indicatorsand a 2 line x 20 character backlit display using plain English text readout. In additionto programming the standard parameters such as starting torque, ramp time, currentlimit, dual ramp and decel control, other features like programmable overload tripcurves (NEMA/UL Classes 5 - 30), starts-per-hour, time between starts and coastdown/back spin lockout protection can also be programmed for your specific application needs.1.2 SpecificationsType of LoadThree phase AC induction motors or synchronous motorsAC Supply Voltage208 - 600 VAC 10%, 50/60 HzHP Ratings39 - 1250 Amps, 10 - 1125 HPUnit Overload Capacity(Percent of motor FLA)125% - Continuous500% - 60 seconds600% - 30 secondsPower Circuit6 SCRsSCR Diode Ratings(Peak Inverse Voltage)1600VPhase InsensitivityUnit operates with any phase sequenceTransient Voltage ProtectionRC snubber dv/dt networks on each phaseCoolingConvection up to 180A, fan assisted 62 - 120AFan ventilated 220 - 1250ABypass ContactorShunt rated contactor included as standard in all NEMA 12 enclosed units 92Aand above. Also standard with all NEMA 12 combination starters. Line startrated contactor available as an option.Ambient Condition DesignChassis units: 0 to 50 C (32 to 122 F)Enclosed units: 0 to 40 C (32 to 104 F)5 - 95% relative humidity0 - 3300 ft. (1000m) above sea level without deratingControl2 or 3 wire 120VAC (customer supplied)Optional 240VAC control voltage and CPTs are availableAuxiliary ContactsApprovalsType/Rating: Form C (SPDT), rated 4 Amps, 240VAC max. (960VA)4 Programmable RelaysUL Listed, Canadian UL (cUL)MOTORTRONICS- 1Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250A1.2 Specifications (continued)Advanced Motor ProtectionTwo Stage ElectronicOverload CurvesStarting: Basic OL programmable for Class 5 - 30 or locked rotor time.Run: Programmable for Class 5 - 30 when "At-Speed" is detected.Overload ResetManual (default) or automaticRetentive Thermal MemoryOverload circuit retains thermal condition of the motor regardless of controlpower status. Unit uses real time clock to adjust for off time.Dynamic Reset CapacityOverload will not reset until thermal capacity available in the motor is enoughfor a successful restart. Starter learns and retains this information bymonitoring previous successful starts.Phase Current ImbalanceProtectionImbalance Trip Level: 5 - 30% current between any two phasesImbalance Trip Delay: 1 -20 secondsOver Current Protection(Electronic Shear Pin)Trip Level: 100 - 300% of motor FLA while running not startingTrip Delay: 1 - 20 secondsLoad Loss Trip ProtectionUnder Current Trip Level: 10 -90 % of motor FLAUnder Current Trip Delay: 1 - 60 secondsCoast Down (Back Spin)Lockout TimerCoast Down Time Range: 1 - 60 minutesStarts-per-hour Lockout TimerRange: 1 - 10 successful starts per hourTime between starts: 1 - 60 minutes between start attemptsProgrammable OutputsType / RatingForm C (DPDT), Rated 4 amps 240 VAC max (960 VA)Run IndicationProgrammableAt Speed IndicationProgrammableAcceleration AdjustmentsProgrammable Ramp Types: Voltage or Current Ramp (VR or CR)Starting Torque: 0 - 100% of line voltage (VR) or 0 - 600% of motor FLA (CR)Ramp Time: 1 to 120 secondsCurrent Limit: 200 - 600% (VR or CR)Dual Ramp Settings4 Options: VR1 VR2; VR1 CR2; CR1 CR2; CR1 VR2Dual Ramp Control: Ramp 1 DefaultRamp 2 selectable via dry contact inputDeceleration AdjustmentsBegin Decel Level: 0 - 100% of line voltageStop Level: 0 to 1% less than Begin Decel LevelDecel Time: 1 - 60 secondsJog SettingsVoltage Jog: 5 - 100%Kick Start SettingsKick Voltage: 10 - 100%Kick Time: 0.1 - 2 secondsFault DisplayShorted SCR, Phase Loss, Shunt Trip, Phase Imbalance Trip, Overload,Overtemp, Overcurrent, Short Circuit, Load Loss, Undervoltage, Overvoltage,Over or Under Frequency or Any TripLockout DisplayCoast Down Time, Starts Per Hour, Time Between Starts, and Any LockoutMOTORTRONICS - 2Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250A1.2 Specifications (continued)Event HistoryUp to 60 EventsData includes cause of event, time, date, and current for each phase andground fault current at time of eventMetering FunctionsMotor LoadPercent of FLACurrent DataA, B, C Phase Current, Avg Current, Ground FaultThermal DataRemaining thermal register; thermal capacity to startStart DataAvg Start Time, Avg Start Current, Measured Capacity to start, time since laststartRTD Data (Option)Temperature readings from up to 12 RTDs (6 stator RTDs)Voltage MeteringKW, KVAR, PF, KWHSerial CommunicationsProtocolModbus RTUSignalRS-485, RS-422 or RS232NetworkUp to 247 devices for RS485 onlyFunctionalityFull operation, status view, and programming via communications portOperator InterfaceLCD ReadoutAlpha numeric LCD displayKeypad8 function keys with tactile feedbackStatus Indicators8 LEDs include Power, Run, Alarm, Trip, Aux RelaysRemote Mount CapabilityUp to 1000 feet from chassis (use twisted, shielded wire and power source)Clock and MemoryOperating MemoryDRAM loaded from EEPROM at initializationFactory Default StorageFlash EPROM, field replaceableCustomer Settings and StatusNon-volatile EEPROM, no battery backup necessaryReal Time ClockLithium ion battery for clock memory onlyMOTORTRONICS- 3Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250A1.3 - Theory of OperationThe power of the DXT Series is in the CPU, a microprocessor basedprotection and control system for the motor and starter assembly. TheCPU uses Phase Angle Firing of the SCRs to apply a reduced voltageto the motor, and then slowly and gently increases torque throughcontrol of the voltage and current until the motor accelerates to fullspeed. This starting method lowers the starting current of the motor,reducing electrical stresses on the power system and motor. It alsoreduces peak starting torque stresses on both the motor and loadmechanical components, promoting longer service life and less downtime.Acceleration: The DXT Series comes standard with several methods ofaccelerating the motor so that it can be programmed to match almostany industrial AC motor application.The factory default setting applies a Voltage Ramp with Current Limitas this has been proven the most reliable starting method for the vastmajority of applications. Using this starting method, the Initial Torquesetting applies just enough voltage to the motor to cause the motor shaftto begin to turn. This voltage is then gradually increased over time (asper the Ramp Time setting) until one of three things happen: the motoraccelerates to full speed, the Ramp Time expires or a Current Limitsetting is reached.If the motor accelerates to full speed before the ramp time setting hasexpired, an automatic Anti-Oscillation feature will override the remainingramp time and full voltage will be applied. This will prevent any surgingor pulsation in the motor torque, which might otherwise occur due to theload not being fully coupled to the motor when operating at reducedvoltage and torque levels.If the motor has not reached full speed at the end of the ramp timesetting, the current limit setting will proportionally control the maximumoutput torque. Feedback sensors in the DXT Series provide protectionfrom a stall condition, an overload condition or excessive accelerationtime.The Current Limit feature is provided to accommodate installationswhere there is limited power available (for example, on-site generatorpower or utility lines with limited capacity). The torque is increased untilthe motor current reaches the pre-set Current Limit point and it is thenheld at that level. Current Limit overrides the ramp time setting so if themotor has not accelerated to full speed under the Current Limit setting,the current remains limited for as long as it takes the motor to accelerateto full speed.When the motor reaches full speed and the current drops to runninglevels, the DXT Series detects an At-Speed condition and will close theBypass Contactor (if provided). The Bypass Contactor serves to shuntpower around the SCR stack assemblies to prevent heat build-upNEMA12 enclosed units and combination starters due to the slightvoltage drop across the SCRs. At this point, the DXT Series has themotor operating at full voltage, just as any other starter would.MOTORTRONICS - 4Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250AOther starting methods available in the DXT Series are:· Current Ramp: uses a closed current feedback PID loop to provide a lineartorque increase up to a Maximum Current level.· Constant Current: current is immediately increased to the Current Limit pointand held there until the motor reaches full speed.· Custom Curve: gives the user the ability to plot torque and time points on agraph. The soft starter will then accelerate the motor following these points.· Tachometer Feedback Ramp: uses a closed loop speed follower methodmonitoring a tachometer input signal from the motor or load shaft.Deceleration: the DXT Series provides the user with the option of having theload coast to a stop or controlling the deceleration by slowly reducing the voltageto the motor upon initiating a stop command. The Decel feature is the oppositeof DC injection braking in that the motor will actually take longer to come to astop than if allowed to coast to a stop. The most common application for theDecel feature is pumping applications where a controlled stop prevents waterhammer and mechanical damage to the system.1.4 General ProtectionOperation of the DXT Series can be divided into 4 modes; Ready, Start, Run andStop. The CPU provides motor and load protection in all four modes. Additionaldetails on each protection feature can be found in later chapters.Ready Mode: In this mode, control and line power are applied and the starter isready for a start command. Protection during this mode includes the monitoringof current for leakage through multiple shorted SCRs. Other protection featuresin effect are:·····Starter TemperatureShorted SCRPhase Reversal (if enabled)Line Frequency Trip WindowExternal Input FaultsNote: The “Programming Mode” can only be entered from the Ready Mode.During programming, all protection features and start command are disabled.Start Mode: These additional protection functions are enabled when the softstarter receives a valid Start command:··········Phase Reversal (if enabled)Start CurveAcceleration TimerPhase ImbalanceShort Circuit / Load Pre-check (Toe-in-the-Water)Ground Fault (Option)External Input FaultsAccumulated Starting FLA Units (I2t Protection)Overload ProtectionThermal CapacityNote: Shorted SCR and Shunt Trip protection are no longer in effect once thesoft starter goes into the Start Mode.MOTORTRONICS- 5Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250ARun Mode: The soft starter enters the Run Mode when it reaches full outputvoltage and the motor current drops below the FLA setting (motor nameplateFLA plus service factor) for a pre-determined period of time. During the RunMode these additional protection features are enabled:·····Running Overload CurvePhase LossUnder Current / Load LossOver Current / Electronic Shear PinExternal Input FaultsStop Mode: Once a Stop command has been given, the DXT Series protectionfeatures change depending on which Stop Mode is selected.· Decel Mode: retains all protection features of the Run Mode. At the end ofDecel, the motor will be stopped and the protection features change asindicated below.· Coast-To-Stop Mode: power is immediately removed from the motor and thesoft starter returns to the Ready Mode. Additional protection features activatedwhen the stop command is given include:····Coast-Down / Back Spin TimerStarts-per-HourTime Between StartsExternal Input Faults1.5 Thermal Overload ProtectionThe DXT Series plays an important role in the protection of your motor in that itmonitors the motor for excessive thermal conditions due to starting, running or evenambient conditions. The DXT Series has a Dynamic Thermal Register system in theCPU that provides a mathematical representation of the thermal state of the motor.This thermal state information is kept in memory and is monitored for excesses inboth value and rate of change. Input is derived from current imbalances and(optional) RTD measurements making it dynamic to all processes involving themotor. The DXT Series monitors these conditions separately during Start and Runmodes to provide proper thermal overload protection at all times.Start Mode overload protection is selectable using one of three methods:· Basic Protection: I2t data is accumulated and plotted based on an OverloadCurve selected in programming. This is programmed per NEMA Class 5-30standard curves and is based on the Locked Rotor Current (from the motornameplate) as programmed into the soft starter.· Measured Start Capacity: the user enters a measured amount of thermalcapacity from a pre-selected successful start as a setpoint to the ThermalRegister for the soft starter to follow.· Learned Curve Protection: the user sets the soft starter to the “LEARN” modeand starts the motor under normal starting conditions. The CPU then samplesand records 100 data points during the start curve, analyzes them and createsa graphical representation in memory. The soft starter is then switched toCurve Follow protection mode and monitors motor performance against thiscurve. This feature is especially useful in initial commissioning tests to recorda base line performance sample (in this case, it is not necessarily used formotor protection).MOTORTRONICS - 6Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250ARun Mode overload protection is initiated when the DXT Series determinesthat the motor is At-Speed. Overload Protection is initiated when the motor RMScurrent rises above a “pick-up point” (as determined by the motor nameplateFLA and service factor). Run mode protection is provided by the CPU monitoring the Dynamic Thermal Register. Data for the Dynamic Thermal Register isaccumulated from I2t calculations and cooling rates. A trip occurs when theregister reaches 100% as determined by the selected Overload ProtectionCurve (NEMA Class 5-30 standard curves) and is based on the programmedLocked Rotor Current indicated on the motor nameplate. The Dynamic ThermalRegister is altered, or “biased”, by the following conditions:· Current Imbalance: will bias the register higher to add protection fromadditional motor heating during a current imbalance condition.· Normal Cooling: provided when the motor current drops below the pick-uppoint or the motor is off line. The cooling rate is lower for motors that are offline (such as after a trip) since cooling fans are also inoperative.· RTD Input: (requires the optional RTD monitor card): will bias the register ineither direction based on real-time input of the motor, bearing and evenambient temperature conditions.· Dynamic Reset is another feature that adds reliability and consistency to theperformance of the DXT Series soft starter. If a motor overload conditionoccurs and the soft starter trips, it cannot be reset until sufficient cool downtime has elapsed. This cool down time is determined by the thermal state ofthe motor when it tripped (i.e. hot motors cool more quickly due to additionalconvection). The cool down time is also biased by RTD measurements whenused.Retentive Thermal Memory provides continuous overload protection and realtime reset even if power is lost. Upon restoration of power, the DXT Series willread the Real Time Clock and restore the thermal register to what it should begiven the elapsed time.· Learned Reset Capacity is a feature that is unique to the DXT Series. Bysampling the amount of thermal capacity used in the previous three successfulstarts, the DXT Series will not allow a reset until a sufficient amount of thermalcapacity has been regained in the motor. This prevents nuisance tripping andinsures that unsuccessful start attempts (which would otherwise use up thestarts-per-hour capacity of the motor) are not allowed.MOTORTRONICS- 7Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250AChapter 2 - Installation2.1 Receiving and UnpackingUpon receipt of the unit: Carefully unpack the unit and inspect it for any shipping damage.Report any damage immediately and file a claim with the freightcarrier within 15 days of receipt. Verify that the model number on your unit matches your purchaseorder. Confirm that the ratings label on the unit matches or is greater thanthe motor’s HP and current rating.2.2 Initial Unit Inspection Make a complete visual check of the unit for damage which may haveoccurred during shipping and handling. Do not attempt to continueinstallation or start up the unit if it is damaged. Check for loose mechanical assemblies or broken wires which mayhave occurred during transportation or handling. Loose electricalconnections will increase resistance and cause the unit to functionimproperly. Prior to beginning the installation, verify that the motor and DXT unitare rated for the proper amperage and voltage.2.3 LocationThe proper location of the unit is an important factor in achieving theunit’s specified performance and normal operation lifetime. The unitshould always be installed in an area where the following conditionsexist: Ambient Operating Temperature: 0 C to 50 C (32 F to 122 F)(Optional space heaters can be provided for operation in ambienttemperature to -20 C.) Protected from rain and moisture. Humidity: 5% to 95% non-condensing. Free from metallic particles, conductive dust and corrosive gas. Free from excess vibration (below 0.5G) Open panel units must be mounted in the appropriate type ofenclosure. Enclosure size and type must be suitable to dissipate heatgenerated by the soft starter. Contact factory for assistance in sizingthe enclosure.Warning!Do not service equipment with voltage applied! The unitcan be the source of fatal electrical shocks! To avoidshock hazard, disconnect main power and control powerbefore working on the unit. Warning labels must beattached to terminals, enclosure and control panel tomeet local codes.2.4 Mounting and CleaningWhen drilling or punching holes in the enclosure, cover the electricalassembly to prevent metal filings from becoming lodged in areas whichcan cause clearance reduction or actually short out electronics. Afterwork is completed, thoroughly clean the area and reinspect the unit forforeign material. Make sure there is sufficient clearance (six inches) allaround the unit for cooling, wiring and maintenance purposes. Tomaximize effective air flow and cooling, the unit must be installed with itsheat sink ribs oriented vertically and running parallel to the mountingsurface.MOTORTRONICS - 8Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250AWarning! Remove all sources of power before cleaning the unit!In dirty or contaminated atmospheres the unit should be cleaned on a regularbasis to ensure proper cooling. Do not use any chemicals to clean the unit. Toremove surface dust use 80 to 100 psi, clean, dry compressed air only. A threeinch, high quality, dry paint brush is helpful to loosen up the dust prior to usingcompressed air on the unit.2.5 Power Terminal Wire Range and Tightening TorqueMax 0 125125 150150 200200 250250 300300 350350 400400 500500 600600 700700 800800 900900 10001000 0152230455575110132160200WireRangeTorquelbs/in#18 - #420#14 - #450#14 - #1/050#6 - 250 kcmil325(2) #6 - 250 kcmil325(2) #2 - 250 kcmil375(3) #2 - 600 kcmil375(4) 300 kcmil - 800 kcmil500315400Note: All wiring must be sized according to NEC standards2.6 DimensionsDXT DIMENSIONSEnclosurePANELNEMA1NEMA 4/4XNEMA12ModelNumberDXT-39 to DXT-120DXT-150 to DXT-180DXT-220 to DXT-288DXT-360 to DXT-550DXT-718 to DXT-1006DXT-1150 to DXT-1250DXT-39 to DXT-120DXT-150 to DXT-180DXT-220 to S1-288DXT-360 to DXT-550DXT-718 to DXT-1006DXT-1150 to DXT-1250DXT-39 to DXT-78DXT-92 to DXT-120DXT-150 to S1-288DXT-360 to DXT-550DXT-718 to DXT-1006DXT-1150 to .338.324.313.344.330.313.350.236.315.5Contact 0Contact ct oor MountedContact FactoryBFCDEMOTORTRONICS- 9Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250A2.7 Power ConnectionsConnect appropriate power lines to the unit input terminals marked L1, L2, L3.Avoid routing power wires near the control board. Connect the motor leads to theunit terminals marked T1, T2, T3. Refer to NEC standards for wire length and sizing.Never interchange input and output connections to the unit. This could causeexcessive voltage in the control logic circuit and may damage the unit.DXT Series UnitNote: Never connect power factor correctioncapacitors on the load side of the unit. The SCRswill be seriously damaged if capacitors are locatedon the load side.The unit must be tested with a motor or other test load connectedto the load side of the unit. (A load bank can be used if a motor isnot available). Note that line voltage will appear across the output terminals if thereis no motor or load connected to the unit. In areas where lightning is a significantproblem, station-type air gap lightning arrestors should be considered and utilizedon the input power source.Power Connections2.7.1 GroundingConnect the ground cable to the ground terminal as labeled on the unit. Referto the National Electrical Code for the proper ground wire sizing and be surethat the ground connector is connected to earth ground.TB42.8 Control ConnectionsSeparate 120VAC supply is required (240VAC for 380V and 415Vapplications). The control voltage should be connected to pins 1 and 6 ofTB4 on the power board. This control voltage must be customer supplied,unless an optional control power transformer (See chart) has been suppliedwith the unit.DXT Model(by Amps)Recommended TransformerSizesPanelNEMA 1NEMA 4/12DXT-150 to DXT-18050 VA100 VA250 VA*DXT-22050 VA100 VA500 VA*DXT-288 to DXT-360250 VA250 VA500 VA*DXT-414 to DXT-550250 VA250 VA750 VA*DXT-718 to DXT-862500 VA500 VA1 KVA*DXT-1006 to DXT-1150500 VA750 VA1.5 KVA*DXT-1200 to DXT-1250500 VA750 VA1.5 KVA*ControlPowerSourceControlPowerReturnUnit comes standard with 120VACcontrol. Order 240VAC control as anoption if required.* Transformer size is adequate to power built-in bypass contactors on these models.Recommended Transformer Sizes for Control PowerNote:1. If power is used for additional accessory items (Lights, fans, etc.)contact factory for sizing.2.8.1 Three-Wire ConnectionFor standard 3-wire control connect 120VAC (or 240VAC for 415Vand 380V applications) to pins 1 and 6 of TB4. Connect N.C. (normallyclosed) stop button between pins 3 and 4 of TB4. Connect N.O.(normally open) start button between pins 4 and 5 of terminal blockTB4.Three-Wire ConnectionMOTORTRONICS - 10Phone: 800.894.0412 - Fax: 888.723.4773 - Web: - Email:

DXT Series39 - 1250A2.8.2 Two-Wire ConnectionAn alternate connection for unattended operation replaces start/stop pushbuttons by connecting a maintained contact closure between pins 3 and5 on TB4. When the maintained contact is used for start/stop it isnecessary to set the overload setpoint to the manual reset position. Thiswill prevent the motor from restarting if the thermal overload trips andthen cools off.Two-Wire ConnectionWarning!When two-wire connection method is used, the start circuit mustbe interlocked to prevent automatic restart when either of the twoprotective devices (overload or thermostat) reset. Thermostatsalways automatically reset on cool down.2.8.3 Programmable Relays/Relay ContactsAll the relay contacts are FORM C (Com, N.O., N.C.). Motortronics recommendsfusing all contacts with external fuses. The DXT has four programmable relayson TB3 on the power board. The relays are rated for 240 VAC, 5 A and 1200VA. These relays can respond to either a fault condition or an up-to-speedcondition. In the DXT all tripping functions have been assigned to the TRIP(AUX1) relay, and all alarm (warning) condition has been con

DXT Series 39 - 1250A DXT Series Digital Solid State Soft Starter INSTALLATION & OPERATION MANUAL MOTORTRONICS Solid State AC Motor Control

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