NT21_Setup Manual (V068-E1-1) (986757), страница 33
Текст из файла (страница 33)
If there is a fault,replace the cable. For details on communicationcables, refer to Section 4 Connecting to the Hostfrom the RS-232C Port, and Section 5 Connectingto the Host from the RS-422A/485 Port.Noise caused data corruption duringcommunication.Carry out grounding work in accordance with theconditions by referring to 3-1-4 Grounding, page 18.Noise caused data corruption duringcommunication.Carry out grounding work in accordance with theconditions by referring to 3-1-4 Grounding, page 18.The PC is transmitting incorrectdata.Check the operation at the host side.SectionMaintenance of the NT21Error DetailsTime-out ErrorDisplayed Probable Cause7-3RemedyThe connecting cables are notconnected correctly.
(Send/Receive)Check the communication cable connection andperform a conductivity test. If there is a fault,replace the cable. For details on communicationcables, refer to Section 4 Connecting to the Hostfrom the RS-232C Port, and Section 5 Connectingto the Host from the RS-422A/485 Port.The communication service of thehost is stopped. (Send/Receive)Check that the host is capable of communicatingwith the NT21 (confirm that the communicationsettings of the host and NT21 match, andconnection between the host and NT21 if flowcontrol is set).Time-out Interval is too short. (Send)Set a longer value for Time-out Interval at the hostside.Time-out Interval is too short.(Receive)Set a longer value for Time-out Interval in theSystem Menu.
(6-9-16 Setting the Time-out Interval,page 142) It may also be possible to solve theproblem by shortening the host cycle time.The unit # does not match that seton the PC.Re-set the unit number at the host side to 0.Noise caused data corruption duringcommunication.Carry out grounding work in accordance with theconditions by referring to 3-1-4 Grounding, page 18.NAK received——Check the settings for allocated words and bits.If noise is a possible factor, distance the cable fromsources of noise and insert a noise filter in thepower supply line.If using the equipment in a location subject to a lotof noise, use a cable with a high degree ofprotection against noise for the transmission route.Also make the cable as short as possible.Undefined CommandEErrorThe host is not supported.Check the PC model used for the host.Command level 3 is not effective.Check that the command level setting for the host islevel 1, 2, 3.Data Over Flow ErrorCommunication command from thehost is too long.
(With memory link)Set flow control method in the host.Increase transmission interval.Command transmission to the hostis not possible.Check the communication cable.Check the control method at the PT and the host.Increase the baud rate if it is too slow.PC Unit No. Error7-3Maintenance of the NT21Carry out maintenance work in order to ensure that the NT21 is always used inits optimum condition.WARNINGDo not attempt to take the Unit apart and do not touch any internal parts while the power is being supplied. Doing either ofthese may result in electrical shock.Backing Up Screen DataAlways back up the screen data and store it in a safe place in case a problemdevelops and the NT21 needs to be replaced or repaired.Preparing a Spare PTIt is advisable to have a spare NT21 available to minimize system downtime inthe event of an NT21 failure or if the screen display becomes difficult to read dueto deterioration of the display unit.183SectionMaintenance of the NT217-37-3-1 Installing or Replacing the BatteryAn optional lithium battery can be installed in the NT21 to backup the memorycontents, data saved by the resume function, display history data, alarm historyrecord data, and recipe data.
(The battery is an optional accessory, so a batteryis not installed when the NT21 is shipped from the factory.)The battery life is about 5 years if the NT21 is used in a location where the ambient temperature is 25_C. If the temperature at the location of use is higher thanthis, the battery life will be shorter. Change the battery at suitable intervals in accordance with the operating environment of the NT21.It is advisable to keep a spare battery so that the battery can be replaced immediately when replacement becomes necessary.If a battery is installed, turn ON the Battery Low Check memory switch.Battery Model3G2A9-BAT08Use the following procedure to install the battery.Installing the Battery1, 2, 3...1. Insert a flat blade screwdriver at the top of the battery cover located at theright of the rear face of the NT21 and pull it toward you.2.
Mount the battery in the clips on the back of the battery cover and insert thebattery’s connector into the NT21’s connector. When inserting the batteryconnector, check that the connector tab is facing right and insert the batteryconnector fully so that there is no space between the two connectors.3. Arrange the battery wires so that they will not be pinched by the battery cover and close the battery cover.Replacing the BatteryWhen to Replace the BatteryReplace the battery in the following cases. The battery must be replaced within 5days.• When 5 years have passed since the installation of a new battery.• When the RUN Indicator is lit in orange (during operation) or in red (whenstopped).184SectionInspection and Cleaning7-4• When the message “The voltage is lowered.” is displayed when the NT21 isturned ON.• When The voltage is lowered is displayed in the Battery check in the batterycheck menu of the Maintenance mode.Battery Replacement ProcedureUse the following procedure to replace the battery.
To preserve the contents ofthe memory, the battery must be replaced within 5 minutes.1, 2, 3...1. Keep the NT21’s power ON for at least 5 minutes and then turn it OFF.It is also possible to replace the battery with the power ON.Reference: Unless the power is kept ON for at least 5 minutes, the memory contents cannotbe retained for more than 5 minutes without a battery.2. Remove the battery from the battery cover, grip the cable, and pull the connector straight out.3.
Refer to Installing the Battery above (page 184) for details on installing thenew battery.7-4Inspection and CleaningClean and inspect the NT21 regularly to ensure that it is always used in its optimum condition.Cleaning MethodIf the display is dirty the screen is difficult to see. Clean the screen from time totime as follows.• In daily cleaning, wipe the display with a soft dry cloth.
If the soiling is particularly heavy, attempting to remove it by wiping with a dry cloth may damage thefront sheet of the Unit. In this case, wipe with a damp cloth.• If the soiling cannot be removed with a dry cloth, wet the cloth with diluted neutral detergent (2%), wring it out well and wipe the display with it.• If rubber or vinyl products, tape, etc., are left stuck to the display for long periods they will cause staining. If such items are stuck to the display, remove themduring cleaning.Note Never use volatile solvents such as benzene or thinners, or chemical dusters.Otherwise the product may malfunction.Inspection MethodIn normal environments, inspect the NT21 at intervals of between 6 months anda year.
In environments that are extremely hot and humid, or very dusty environments, shorten the inspection interval.Items Required for the InspectionPrepare the following items before starting the inspection.• Screwdrivers (Philips, flat head)• Tester (or digital voltmeter)• Industrial alcohol• 100% cotton cloth• Hygrometer (required in some cases)• Thermometer (required in some cases)• Synchroscope (required in some cases)• Pen-writing oscilloscope (required in some cases)Points InspectedInspect the following points to determine if there is any divergence from thestated criteria. If there is, either improve the surrounding environment so that thevalues fall within the stated range, or adjust the NT21, for example by re-tightening screws.185SectionInspection and CleaningPointInspectedInspection DetailsCriterionInspectionInstrumentPower supplyvoltageFluctuation in power supply terminalvoltageAmbienteo e taenvironmentalconditionsAmbient temperature (temperature in the 0 to 50_Coperation panel)ThermometerAmbient humidity (humidity in theoperation panel)35% to 85% RHHygrometerPresence/absence of dustDust must not be settledVisual inspectionLooseness of mounting brackets, etc.To be no loosenessPhilips screwdriverConnector connections of connectingcableTo be fully inserted and locked, withno loosenessPhilips screwdriverLooseness of screws in external wiringTo be no loosenessPhilips screwdriverMountinggconditionsdi iComponentswith limitedlivesPermissible voltage fluctuation range(24 VDC −15% to +15%)7-4TesterConditions of external connecting cables Faults such as incipient disconnectionVisual inspectionBrightness of the backlightVisual inspectionNoteMust be sufficiently bright.Backlight life:At normal ambient temperature andhumidity, the backlight brightness willdrop to about 50% of its originalbrightness after 50,000 hours of use.1.
Do not disassemble for repairs or modification. Otherwise the product maymalfunction.2. The disposal of the Unit and spent batteries may be regulated by national orlocal authorities. Dispose of them in accordance with the laws and regulations of the relevant country and local authority.Reference: Desire on replacing the NT21When replacing the NT21 after discovering a fault during inspections, note thefollowing points:S Be sure to switch the power OFF before starting replacement.S After replacement, check that the new NT21 is not subject to the same error.S If a faulty Unit is returned for repairs, write as detailed a description of the faultas possible and send this description together with the Unit to the OMRON address indicated on the back cover of this book.186Appendix ASpecificationsGeneral SpecificationsItemSpecificationRated power supply voltage24 VDCAllowable power supply voltage range20.4 VDC to 27.6 VDC (24 VDC –15% to +15%)Allowable power interruption timeNo regulationPower consumption7 W max.Ambient temperatureOperating: 0 to +50_CStorage: –20 to +70_COperating ambient humidity35% to 85% humidity at 0 to 40_C (with no condensation)35% to 55% humidity at 40 to 50_C (with no condensation)Operating environmentNo corrosive gasesNoise resistanceConforms to IEC 61000-4-4.2,000 V (power supply line)Vibration resistance (operating)10 to 57 Hz with 0.075 mm amplitude and 57 to 150 Hz with 9.8 m/s2acceleration for 60 minutes in each of X, Y, Z directionsShock resistance (operating)147 m/s2, 3 times in each of X, Y, and Z directionsDimensions190 (W)110 (H)53.5 (D) mm(With Expansion Unit mounted: 190 (W)Panel cutout dimensions178.5110 (H)73.5 (D) mm)× 100.5 +0.5 mm+0.500Panel thickness range: 1.6 to 4.8 mmWeight0.6 kg max.Enclosure ratingsFront panel: Equivalent to IP65F (NEMA4)*GroundingD-type grounding (Ground to 100 Ω or less)International standardsUL, cULus, EC directives, C-Tick Class 1 Division 2* The NT21 may not be used at a location where it is exposed to splashing oil for a long period.187Appendix ASpecificationsPerformance SpecificationsDisplay SpecificationsItemSpecificationDisplay deviceMonochrome STN LCD (with backlight)Number of dots (resolution)260 dots horizontallyDot pitch0.450.45 mmDot size0.420.42 mmSize of a standard characterHeight 7.2 mmEffective display area117 mm horizontallyView angleUp/Down: "30_Left/Right: "30_Display colorWhite, black 2 color (blue mode)Displa panelDisplay140 dots vertically63 mm verticallyLife expectancy50,000 hours minimum(until brightness reduced by half)Life expectancy*1The contrast can be adjustedjwith the contrast adjustmentjon theb k off thbackthe NT21NT21.50,000 hours minimumReplacementNot user serviceableBrightness adjustmentNot user serviceableAutomatic turn-OFF functionCan be set to turn OFF in 1 to 255 minutes, or to remain ONRUNLit green: Running normally, Memory Unit automatic transmissiondoneFlashing green: Memory Unit automatic transmission beingexecuted, Memory Unit automatic transmission errorLit orange during operation: Low battery voltage (when a battery isinstalled)Lit red when NT21 is stopped: Low battery voltage (when a battery isinstalled)Contrast adjustmentBacklight(white coldcathode tube)Indicators*1: Time taken for brightness to reduce to half at normal temperature and humidityPanel SpecificationsItemSpecificationType :Resistive typeNumber of switches:91 (13 horizontallyMaximum number that can be registered on one screen: 256Touch panelCell size:Approx.
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