User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDE4.13 DC OUTPUTThis option provides a voltage (terminals 3A3B only) or mA output. Terminal location is shown in figure 2.2.CAUTIONThere are no mechanical interlocks to prevent a chassis with the dc output option being fitted into a‘sleeve’ or ‘case’ which has previously been wired for the standard relay output. Before fitting thechassis into the case, it should be ensured that the terminal wiring is not attached to live voltage supplies,as such voltages may cause permanent damage to the instrument.4.13.1 Configuration displayAs shown in the figure below, highlight the required DC output, then operate the scroll button to reveal theconfiguration page.DC Output.3A3B (DC Op)Select configuration menuTypeVNetworkGroupChannelVirtual ChannelLoopDigital I/ODC Output3A3B (DC.Op)2A2B (DC.Op)1A1B (DC.Op)PVStatusOP Adjust StateResolutionOutput LowOutput HighScale LowScale High0.00GoodAdjusted20.0010.000.00100.00Appears only ifthe DC Outputhas been adjusted(Section4.1.10)Fallback PV0.00Measured Value0.00PARAMETERSTypePVStatusOP Adjust StateResolutionOutput LowOutput HighScale LowScale HighFallback PVMeasured ValueFigure 4.13.1 DC Output option configuration page (typical)Select V(olts) (3A3B only) or mA as the output type.Input value to the function. Normally ‘wired’ to a suitable parameter.The status of the input parameter.Adjusted. Appears only if the Output Adjust facility (Section 4.1.10) has been used.The number of decimal places to be used for this configuration item.The minimum output value in Volts or mA as appropriateThe maximum output value to be output in Volts or mA as appropriate.See ‘SCALING INFORMATION’ below.See ‘SCALING INFORMATION’ below.The output value when the status of the input parameter is not ‘good’.The Voltage or mA value appearing at the output terminalsNote: The output voltage or current can be calibrated by using the output adjust proceduredescribed in Section 4.1.10.SCALING INFORMATIONWhen PV = Scale Low, Output = output low value. When PV = Scale high, Output = output high value. ThePV is mapped via the scale range onto the output range according to the equation:( Output High - Output Low ) Output LowOutput = PV - Scale Low⎜ ⎛⎟⎞+⎝ Scale High - Scale Low ⎠Page 148HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDE4.14 USER LINAllows the entry of up to four user linearisation tables, any one of which can be selected as ‘Lin Type’ in Channelconfiguration (Section 4.4.1). Configuration consists of defining the number of points to be included (2to 32) and then entering an X and a Y value for each point, where X values are the inputs and the Y valuesare the resulting outputs.4.14.1 User linearisation table rules1. Tables must be monotonic - i.e. there may not be more than one X value with the same Y valueassigned to it.2 Each X value must be greater than the preceding one.3. Each Y value must be greater than the preceding one.4. If units other than temperature units are to be displayed, the channel scale high and scale low valuesshould be set to the same as the range high and low values, and the required scale units entered.Figure 4.14.1 shows the first part of the configuration table for an imaginary cylinder example.PointpairUser Lin.1Num. of PointsX1Y1X2Y2X3Y3120.000.000.500.071.000.58Volume (cubic metres)Depth (metres)Figure 4.14.1 User Linearisation table exampleWhen configuring a channel (Section 4.4.1) to use a User linearisation table:If Type = Thermocouple or RTD, then Range High/Low must be set to the highest and lowest ‘Y’ values to beused, respectively. The instrument automatically looks up the associated ‘X’ mV or Ohms values.If Type = mV, V or mA, then Range High/Low must be set to the highest and lowest ‘Y’ values to be used,respectively. Input High/Low should be set to the highest and lowest ‘X’ values in the table, respectively.4.15 CUSTOM MESSAGESThis feature allows the entry of up to 10 messages for sending to the history file, when triggered by a wiredsource (e.g. an alarm going active).The messages of up to 100 characters each are entered using either the virtual keyboard, described in Section3.6, or by means of iTools configuration software.Up to three parameter values may be embedded in messages in the format [Address], where ‘Address’ isthe decimal Modbus address of the parameter (Section 5.3). E.G. [256] embeds Channel 1 PV.HA030554Issue 7 Nov 12Page 149
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User Guide - Eurotherm Ltda

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