Current output load, Wiring cable, 152 | Toshiba L5232 specs

6F8A0917

11.3Cautionary Notes on Communications

Observe the following limitations when you communicate with flowmeter using HHT.

Current output load

(1)Load resistance: 240Ω to 1kΩ (including communications line resistance)

(2)Load capacitance: 0.25 μF maximum (including communications line capacitance)

(3)Load inductance: 4mH maximum (including communications line inductance)

(For maximum cable length, about 2km is a guideline length when CVV-S 1.25mm2 is used.)

Wiring cable

Use a shielded cable (CVV-S, etc) for wiring.

Interference on 4 to 20mA current signal

To communicate with the flowmeter, a digital signal (amplitude 0.4 to 0.8 V in the case of 500Ω load resistance) with a frequency of 1.2 to 2.2 kHz is superimposed on the 4 to 20mA current signal. If a receiving instrument with fast response time is connected to the analog current output line, the superimposed communications signal may interfere with the output. To prevent this interference, put a low-pass filter with a time constant of about 100 ms into the input circuit of the receiving instrument.

	Current output line
		R
	Load resistor		C
			C
Converter		Filter	Receiving instrument
			Receiving instrument

Figure 11.3 Filter Connection Example

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Image 153

Toshiba L5232 manual Current output load, Wiring cable, Interference on 4 to 20mA current signal, 152

Contents

6F8A0917 Electromagnetic Flowmeter Converter LF232 Type Nd Edition August First Edition June 6F8A0917 Explanation of signal words Safety symbolsColor explanation Safety Precautions for Installation and Wiring Safety Precautions Safety Precautions for Maintenance and Inspection Warranty and Limitation of LiabilityUsage limitation Do not store or install the flowmeter Handling Precautions Handling Precautions Table of Contents 6F8A0917 6F8A0917 Product Inspection and Storage Product InspectionStorage Overview Features Appearance Names of Parts Internal structure with converter cover opened Terminal block construction Hands Installation 6F8A0917 Unit inch mm How to Install the Converter Example of Pipe Mounting Urn off mains power before working on pipes WiringFrom mains power Do not conduct wiring work with bare hands Installation Cables Installation Cables External Connections 6F8A0917 Wiring Method Terminal Treatment of CablesExcitation cable Terminal Treatment of Flow Rate Signal Cable Connecting the input signal cable Cable Connection Power cable, current output cable and digital I/O cables Connection to Terminal Block Grounding 9a Wiring between Detector and Converter 10 Detector Grounding Method Difficult 11 Connection Example of Electromagnetic Counter Digital I/O Connections Installation WiringReplacing the LF230 Converter Combination with an Existing Detector for Large Meter Size 12 How to Connect an Adjusting Capacitor Replacement of partially filled pipes type 6F8A0917 Operation 6F8A0917 Display and Controls Display and Controls Operation switch infrared switch Names and Functions of Display and ControlsLCD display Instructions Measurement mode Functions of each switchMenu display Setting mode Counter in operaiton Resets the counter Display Format Measured value display formatFlow velocity value and instantaneous flow rate display Total count display Total flow value displayTotal difference flow value display Custom unit display Percent display Mode Switching Error message / other message displayFixed output display ENTER111 6F8A0917 Moving to the menu display Setting Mode Operation To return from the menu display to the measurement mode Checking or changing the setting values Mode switching flow when password is set Password Input Example of password input mode selection SET and password Totalizer Operation Example of totalizer operation Example to move to the maintenance menu Maintenance Menu Return to measurement mode Setting Menu List Parameter Setting Items Parameter Settings / Adjustment Parameters Check / Change Exciting Current ValueChecking the exciting current value Changing the exciting current value Checking the meter size of the detector Meter Size Changing the meter size of the detector Checking the exciting frequency Exciting Frequency10,1/6,1/4 2.5 to 6 mm 26 to 120 500 to 3000 mm Changing the setting value for exciting frequency Checking the flow direction Flow Direction Changing the flow direction Switch Checking the password Password Setting Changing the password Indicates the value in percent of the setting range Normal Indicating UnitChecking the normal indicating unit Currently set main indicating unit % in this example Changing the flow direction for total flow Custom Unit Coefficient of custom unitUnit string of custom unit Checking the coefficient of custom unit Changing the coefficient of custom unitProceed as follows to check the coefficient of custom unit Checking the unit string of custom unit Changing the unit string of custom unitProceed as follows to check the unit string of custom unit Range type Span Value Range Unit of span Span value Span value range setting flow Setting sequence of span value range is shown belowHysteresis Range 2 span value Checking each constantRange 3 span value Range 4 span value Changing the range type Changing the span value Changing the hysteresis Damping Constant Checking the damping constantProceed as follows to check the damping constant Changing the damping constant Low Cutoff value Checking the low cutoff valueProceed as follows to check the low cutoff value Changing the low cutoff value Current Output Setting Used When an Alarm Occurs Current output setting function used when an alarm occursChecking the current output value used when an alarm occurs Changing the current output value used when an alarm occurs Checking whether the display low cut is On or Off Display low cut On/Off Changing the display low cut On/Off setting Checking the output low limit value setting Output Low Limit SettingOutput low limit value Proceed as follows to check the output low limit value Changing the output low limit value setting Digital output state only when alarm output is set Digital I/O FunctionDigital output functions corresponding to each terminal Digital Input Function Digital Output alarm state Checking each setting for digital I/ODigital Input control signal level Digital Output Digital Output alarm status Changing each setting for digital I/O Pulse width mode Count Rate Pulse Rate and Pulse WidthCount rate Over Spec Pulse width Checking the count rate and pulse width Changing the count ratePulse width Changing the pulse width mode setting Changing the pulse width Preset Counter Preset count valuePreset output function Changing the preset count value Checking the preset counter setting 100 Changing the preset output function High/low limit alarm On/Off Flow Rate High/Low limit AlarmHigh/low limit value 101 High-high limit alarm Checking the high/low limit alarm settingLow-low limit alarm On/Off 102 103 Changing the high/low limit alarm On/Off 104 Changing the high/low limit value Setting the fluid empty alarm Fluid Empty AlarmChecking the fluid empty alarm On/Off setting 105 106 Changing the fluid empty alarm On/Off setting Self-diagnosis function On/Off setting Self-Diagnosis Function107 Alarm output factor setting Checking the self-diagnosis alarm setting108 109 Changing the self-diagnosis function setting Rate-of-Change Limit Value and Control Time Checking the rate-of-change limit settingRate-of-change limit value Rate-of-change control time 111 Changing the rate-of-change limit setting 112 Initial Settings When Shipped from the Factory 113 Fixed output mode can be selected by the setting as follows Fixed value output On/Off settingFixed Value Output Loop Check Fixed current output value Checking the fixed output function setting Fixed pulse output value115 116 Changing the fixed output function 117 Changing the fixed output constant Zero Adjustment Still Water Zero Adjustment118 119 How to calculate the zero offset value Zero Offset AdjustmentChecking the zero offset adjustment value 120 121 Changing the zero offset adjustment value Mag-Prover Calibration Calibration Items122 1 0% Flow Rate Calibration Zero Calibration Converter Check / CalibrationChecking the zero point Calibrating the zero point Checking the 50% flow rate value 2 50% Flow Rate Calibration124 50% flow rate value can be checked only Checking the span value 3 100% Flow Rate Calibration Span CalibrationCalibrating the span value 125 Checking the Exciting Current Value 126Monitor value of the exciting current can be checked 127 Function Description Digital Outputs Digital I/O SpecificationsDigital Input option 128 129 Totalizer and Pulse Output 130 131 Totalizer operation using digital input signals 132 Multi-Range Functions Output performance when multiple ranges are used Single direction internal automatic switching, 4 ranges133 Output when switched from Reverse to 134Forward direction Direction 135 Single direction external signal switching, 2 ranges 136 137 Single direction external signal switching, 4 ranges Flow rate high/low limit alarm output performance Flow Rate High/Low Limit Alarm Output138 Case of Single range 139 Case of Multi-range setting 140 Output when an alarm is generated Fluid Empty Alarm OutputAlarm output state described in 8.2.14 Digital I/O Function 141 142 Preset Counter Output Function 143 Preset counter output performance 144 Output example of one-shot pulse output 145 146 Remote Still Water Zero Adjustment 147 Remote Selection of Fixed Value Output 148 Converter Error Alarm Output Communications Function Connection with the HHT terminal149 Connection to the Converter Main Unit 150 151 Procedure for Communication with HHT Interference on 4 to 20mA current signal Wiring cableUse a shielded cable CVV-S, etc for wiring Current output load Diagnostic messages Diagnosis and AlarmsSetting error High/low limit alarm Process error alarm Fluid empty alarm154 155 Self-diagnosis error 156 Output When an Error or Alarm Occurs Maintenance Maintenance and Inspection Product disposal Check / Replacement of power supply unitOperative life 158 Troubleshooting Flow rate is not indicated159 160 Flow rate indication is not correct 161 Flow rate indication is not stable 162 When switch operation is unable Principle of Operation 163= K × B × D × Q Specifications SpecificationsDetector Combined Specifications 164 165 166 Converter specifications 167 168 169 Model Number Table 170 171 Outline DrawingElectromagnetic Flowmeter Converter LF232 Type Gross mass approx lb8kg including a mounting plate 172 FCF50017