Grounding, 9a Wiring between Detector and Converter | Toshiba L5232

6F8A0917

5.4.3Grounding

The external ground terminal of the detector and the FG terminal of the converter (or external ground terminal of the converter) must be grounded securely with Class D grounding (grounding resistance 100Ω or less). Use an IV wire 5.5mm2 or more for grounding wire.

In addition, do not share the grounding wire with other equipment where grounding current may flow. (An independent grounding is preferable.)

If it is difficult to carry out grounding work at the detector side due to a pit installation or other reasons, use a 3-core cable for the excitation cable and connect the E terminal of the detector to the E terminal or other reasons as shown in Figure 5.9(b), of the converter. (The E terminal of the converter is internally connected to the FG terminal and the converter housing.)

Converter	A	B	X
terminal block	G	E	Y	FG
External ground
terminal
Twisting shields				Class D grounding
				Class D grounding
				(Ground resistance 100 or less)
Input signal cable
Twisting shields				Excitation cable
				Ground terminal
		G		E
	A	B	X	Y
				Class D ground
				(Ground resistance 100 or less)

Detector terminal block

Figure 5.9(a) Wiring between Detector and Converter

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Toshiba L5232 manual Grounding, 9a Wiring between Detector and Converter

Contents

Electromagnetic Flowmeter Converter LF232 Type 6F8A0917 6F8A0917 Nd Edition August First Edition June Safety symbols Explanation of signal wordsColor explanation Safety Precautions Safety Precautions for Installation and Wiring Warranty and Limitation of Liability Safety Precautions for Maintenance and InspectionUsage limitation Handling Precautions Do not store or install the flowmeter Handling Precautions Table of Contents 6F8A0917 6F8A0917 Product Inspection Product Inspection and StorageStorage Features Overview Names of Parts Appearance Internal structure with converter cover opened Terminal block construction Installation Hands 6F8A0917 How to Install the Converter Unit inch mm Example of Pipe Mounting Wiring Urn off mains power before working on pipesFrom mains power Do not conduct wiring work with bare hands Installation Cables Installation Cables External Connections 6F8A0917 Terminal Treatment of Cables Wiring MethodExcitation cable Connecting the input signal cable Terminal Treatment of Flow Rate Signal Cable Power cable, current output cable and digital I/O cables Cable Connection Connection to Terminal Block 9a Wiring between Detector and Converter Grounding Difficult 10 Detector Grounding Method Digital I/O Connections 11 Connection Example of Electromagnetic Counter Wiring InstallationReplacing the LF230 Converter 12 How to Connect an Adjusting Capacitor Combination with an Existing Detector for Large Meter Size Replacement of partially filled pipes type 6F8A0917 Operation 6F8A0917 Display and Controls Display and Controls Names and Functions of Display and Controls Operation switch infrared switchLCD display Instructions Functions of each switch Measurement modeMenu display Setting mode Counter in operaiton Resets the counter Measured value display format Display FormatFlow velocity value and instantaneous flow rate display Total flow value display Total count displayTotal difference flow value display Percent display Custom unit display Error message / other message display Mode SwitchingFixed output display ENTER111 6F8A0917 Setting Mode Operation Moving to the menu display To return from the menu display to the measurement mode Checking or changing the setting values Password Input Mode switching flow when password is set Example of password input mode selection SET and password Totalizer Operation Example of totalizer operation Maintenance Menu Example to move to the maintenance menu Setting Menu List Return to measurement mode Parameter Settings / Adjustment Parameter Setting Items Exciting Current Value Parameters Check / ChangeChecking the exciting current value Changing the exciting current value Meter Size Checking the meter size of the detector Changing the meter size of the detector Exciting Frequency Checking the 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 Flow Direction Checking the flow direction Switch Changing the flow direction Password Setting Checking the password Changing the password Normal Indicating Unit Indicates the value in percent of the setting rangeChecking the normal indicating unit Currently set main indicating unit % in this example Changing the flow direction for total flow Coefficient of custom unit Custom UnitUnit string of custom unit Changing the coefficient of custom unit Checking the coefficient of custom unitProceed as follows to check the coefficient of custom unit Changing the unit string of custom unit Checking the unit string of custom unitProceed as follows to check the unit string of custom unit Span Value Range Range type Span value Unit of span Setting sequence of span value range is shown below Span value range setting flowHysteresis Checking each constant Range 2 span valueRange 3 span value Range 4 span value Changing the range type Changing the span value Changing the hysteresis Checking the damping constant Damping ConstantProceed as follows to check the damping constant Changing the damping constant Checking the low cutoff value Low Cutoff valueProceed as follows to check the low cutoff value Changing the low cutoff value Current output setting function used when an alarm occurs Current Output Setting Used When an Alarm OccursChecking the current output value used when an alarm occurs Changing the current output value used when an alarm occurs Display low cut On/Off Checking whether the display low cut is On or Off Changing the display low cut On/Off setting Output Low Limit Setting Checking the output low limit value settingOutput low limit value Proceed as follows to check the output low limit value Changing the output low limit value setting Digital I/O Function Digital output state only when alarm output is setDigital output functions corresponding to each terminal Digital Input Function Checking each setting for digital I/O Digital Output alarm stateDigital Input control signal level Digital Output Changing each setting for digital I/O Digital Output alarm status Count Rate Pulse Rate and Pulse Width Pulse width modeCount rate Pulse width Over Spec Changing the count rate Checking the count rate and pulse widthPulse width Changing the pulse width mode setting Changing the pulse width Preset count value Preset CounterPreset output function Checking the preset counter setting Changing the preset count value Changing the preset output function 100 Flow Rate High/Low limit Alarm High/low limit alarm On/OffHigh/low limit value 101 Checking the high/low limit alarm setting High-high limit alarmLow-low limit alarm On/Off 102 Changing the high/low limit alarm On/Off 103 Changing the high/low limit value 104 Fluid Empty Alarm Setting the fluid empty alarmChecking the fluid empty alarm On/Off setting 105 Changing the fluid empty alarm On/Off setting 106 Self-Diagnosis Function Self-diagnosis function On/Off setting107 Checking the self-diagnosis alarm setting Alarm output factor setting108 Changing the self-diagnosis function setting 109 Checking the rate-of-change limit setting Rate-of-Change Limit Value and Control TimeRate-of-change limit value Rate-of-change control time Changing the rate-of-change limit setting 111 Initial Settings When Shipped from the Factory 112 113 Fixed value output On/Off setting Fixed output mode can be selected by the setting as followsFixed Value Output Loop Check Fixed current output value Fixed pulse output value Checking the fixed output function setting115 Changing the fixed output function 116 Changing the fixed output constant 117 Still Water Zero Adjustment Zero Adjustment118 119 Zero Offset Adjustment How to calculate the zero offset valueChecking the zero offset adjustment value 120 Changing the zero offset adjustment value 121 Calibration Items Mag-Prover Calibration122 Converter Check / Calibration 1 0% Flow Rate Calibration Zero CalibrationChecking the zero point Calibrating the zero point 2 50% Flow Rate Calibration Checking the 50% flow rate value124 50% flow rate value can be checked only 3 100% Flow Rate Calibration Span Calibration Checking the span valueCalibrating the span value 125 126 Checking the Exciting Current ValueMonitor value of the exciting current can be checked Function Description 127 Digital I/O Specifications Digital OutputsDigital Input option 128 Totalizer and Pulse Output 129 130 Totalizer operation using digital input signals 131 Multi-Range Functions 132 Single direction internal automatic switching, 4 ranges Output performance when multiple ranges are used133 134 Output when switched from Reverse toForward direction Direction Single direction external signal switching, 2 ranges 135 136 Single direction external signal switching, 4 ranges 137 Flow Rate High/Low Limit Alarm Output Flow rate high/low limit alarm output performance138 Case of Single range Case of Multi-range setting 139 140 Fluid Empty Alarm Output Output when an alarm is generatedAlarm output state described in 8.2.14 Digital I/O Function 141 Preset Counter Output Function 142 Preset counter output performance 143 144 145 Output example of one-shot pulse output Remote Still Water Zero Adjustment 146 Remote Selection of Fixed Value Output 147 Converter Error Alarm Output 148 Connection with the HHT terminal Communications Function149 150 Connection to the Converter Main Unit Procedure for Communication with HHT 151 Wiring cable Interference on 4 to 20mA current signalUse a shielded cable CVV-S, etc for wiring Current output load Diagnosis and Alarms Diagnostic messagesSetting error High/low limit alarm Fluid empty alarm Process error alarm154 Self-diagnosis error 155 Output When an Error or Alarm Occurs 156 Maintenance and Inspection Maintenance Check / Replacement of power supply unit Product disposalOperative life 158 Flow rate is not indicated Troubleshooting159 Flow rate indication is not correct 160 Flow rate indication is not stable 161 When switch operation is unable 162 163 Principle of Operation= K × B × D × Q Specifications SpecificationsDetector Combined Specifications 164 165 Converter specifications 166 167 168 Model Number Table 169 170 Outline Drawing 171Electromagnetic Flowmeter Converter LF232 Type Gross mass approx lb8kg including a mounting plate 172 FCF50017