Pulse width, Over Spec | Toshiba L5232 manual

6F8A0917

Pulse width

The pulse width for totalizer pulse output is set.

If Automatic setting (1:AUTO) is selected for pulse width mode, it is not necessary to set the pulse width.

•The pulse width must be set to a value within the range of 0.3ms to 500ms. If you try to set a value exceeding 500 ms, the value will be forcibly changed to 500ms.

•The pulse width must be set to 40% or less of the pulse period at 100% output. If a value exceeding this limit is tried to set, regardless of the range described above, an error message

*H. OVER SPEC

appears and the value returns to the previously set value. Try to set a new value again.

If the pulse width is set to 0, it will be automatically set to 40% of the pulse period at 100% output. However, if the calculation result exceeds 100ms, it will be forcibly set to 100ms.

Example 1 In the case of the following: Range: 3,600m3/h (1m3/s) Count rate: 0.001m3

Since the count rate is 3,600 m3/h ÷ 0.001(m3) = 3,600,000 pulses/h (1000 pulses/s), the full-scale period is 1s ÷ 1000 = 1ms.

Therefore, the pulse width can only be set to 1ms x 0.4 = 0.4ms.

Example 2 In the case of the following: Rage: 3,600m3/h (1m3/s) Count rate: 1000m3

Since the pulse count is 3,600m3/h ÷ 1000m3 = 3.6 pulses/h (0.001 pulse/s), the full-scale period is 1s ÷ 0.001 = 1000s.

Therefore, the pulse width becomes 1000s × 0.4 = 400s. However, since the maximum value is 500ms, the pulse width becomes 500ms.

Example 3 In the case of the following: Rage: 3,600m3/h (1m3/s) Count rate: 1m3

Pulse width is set to 0ms

Since the pulse count is 3,600m3/h ÷ 1m3 = 3600 pulses/h (1 pulse/s), the full-scale period is 1s ÷ 1 = 1s.

Therefore, the pulse width becomes 1s × 0.4 = 400ms. However, in the case of automatic setting, since the maximum value is 100ms, the pulse width becomes 100ms.

- 94 -

Image 95

Toshiba L5232 manual Pulse width, Over Spec

Contents

6F8A0917 Electromagnetic Flowmeter Converter LF232 Type Nd Edition August First Edition June 6F8A0917 Color explanation Explanation of signal wordsSafety symbols Safety Precautions for Installation and Wiring Safety Precautions Usage limitation Safety Precautions for Maintenance and InspectionWarranty and Limitation of Liability Do not store or install the flowmeter Handling Precautions Handling Precautions Table of Contents 6F8A0917 6F8A0917 Storage Product Inspection and StorageProduct Inspection 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 Do not conduct wiring work with bare hands WiringUrn off mains power before working on pipes From mains power Installation Cables Installation Cables External Connections 6F8A0917 Excitation cable Wiring MethodTerminal Treatment of Cables 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 Replacing the LF230 Converter InstallationWiring 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 LCD display Operation switch infrared switchNames and Functions of Display and Controls Instructions Counter in operaiton Resets the counter Functions of each switchMeasurement mode Menu display Setting mode Flow velocity value and instantaneous flow rate display Display FormatMeasured value display format Total difference flow value display Total count displayTotal flow value display Custom unit display Percent display Fixed output display Mode SwitchingError message / other message 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 Checking the exciting current value Parameters Check / ChangeExciting Current Value Changing the exciting current value Checking the meter size of the detector Meter Size Changing the meter size of the detector 26 to 120 500 to 3000 mm Exciting FrequencyChecking the exciting frequency 10,1/6,1/4 2.5 to 6 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 Checking the normal indicating unit Indicates the value in percent of the setting rangeNormal Indicating Unit Currently set main indicating unit % in this example Changing the flow direction for total flow Unit string of custom unit Custom UnitCoefficient of custom unit Proceed as follows to check the coefficient of custom unit Checking the coefficient of custom unitChanging the coefficient of custom unit Proceed as follows to check the unit string of custom unit Checking the unit string of custom unitChanging the unit string of custom unit Range type Span Value Range Unit of span Span value Hysteresis Span value range setting flowSetting sequence of span value range is shown below Range 4 span value Checking each constantRange 2 span value Range 3 span value Changing the range type Changing the span value Changing the hysteresis Proceed as follows to check the damping constant Damping ConstantChecking the damping constant Changing the damping constant Proceed as follows to check the low cutoff value Low Cutoff valueChecking the low cutoff value Changing the low cutoff value Checking the current output value used when an alarm occurs Current Output Setting Used When an Alarm OccursCurrent output setting function 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 Proceed as follows to check the output low limit value Output Low Limit SettingChecking the output low limit value setting Output low limit value Changing the output low limit value setting Digital output functions corresponding to each terminal Digital output state only when alarm output is setDigital I/O Function Digital Input Function Digital Output Checking each setting for digital I/ODigital Output alarm state Digital Input control signal level Digital Output alarm status Changing each setting for digital I/O Count rate Pulse width modeCount Rate Pulse Rate and Pulse Width Over Spec Pulse width Pulse width Checking the count rate and pulse widthChanging the count rate Changing the pulse width mode setting Changing the pulse width Preset output function Preset CounterPreset count value Changing the preset count value Checking the preset counter setting 100 Changing the preset output function 101 Flow Rate High/Low limit AlarmHigh/low limit alarm On/Off High/low limit value 102 Checking the high/low limit alarm settingHigh-high limit alarm Low-low limit alarm On/Off 103 Changing the high/low limit alarm On/Off 104 Changing the high/low limit value 105 Fluid Empty AlarmSetting the fluid empty alarm Checking the fluid empty alarm On/Off setting 106 Changing the fluid empty alarm On/Off setting 107 Self-diagnosis function On/Off settingSelf-Diagnosis Function 108 Alarm output factor settingChecking the self-diagnosis alarm setting 109 Changing the self-diagnosis function setting Rate-of-change control time Checking the rate-of-change limit settingRate-of-Change Limit Value and Control Time Rate-of-change limit value 111 Changing the rate-of-change limit setting 112 Initial Settings When Shipped from the Factory 113 Fixed current output value Fixed value output On/Off settingFixed output mode can be selected by the setting as follows Fixed Value Output Loop Check 115 Checking the fixed output function settingFixed pulse output value 116 Changing the fixed output function 117 Changing the fixed output constant 118 Zero AdjustmentStill Water Zero Adjustment 119 120 Zero Offset AdjustmentHow to calculate the zero offset value Checking the zero offset adjustment value 121 Changing the zero offset adjustment value 122 Mag-Prover CalibrationCalibration Items Calibrating the zero point Converter Check / Calibration1 0% Flow Rate Calibration Zero Calibration Checking the zero point 50% flow rate value can be checked only 2 50% Flow Rate CalibrationChecking the 50% flow rate value 124 125 3 100% Flow Rate Calibration Span CalibrationChecking the span value Calibrating the span value Monitor value of the exciting current can be checked Checking the Exciting Current Value126 127 Function Description 128 Digital I/O SpecificationsDigital Outputs Digital Input option 129 Totalizer and Pulse Output 130 131 Totalizer operation using digital input signals 132 Multi-Range Functions 133 Output performance when multiple ranges are usedSingle direction internal automatic switching, 4 ranges Forward direction Direction Output when switched from Reverse to134 135 Single direction external signal switching, 2 ranges 136 137 Single direction external signal switching, 4 ranges Case of Single range Flow Rate High/Low Limit Alarm OutputFlow rate high/low limit alarm output performance 138 139 Case of Multi-range setting 140 141 Fluid Empty Alarm OutputOutput when an alarm is generated Alarm output state described in 8.2.14 Digital I/O Function 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 149 Communications FunctionConnection with the HHT terminal Connection to the Converter Main Unit 150 151 Procedure for Communication with HHT Current output load Wiring cableInterference on 4 to 20mA current signal Use a shielded cable CVV-S, etc for wiring High/low limit alarm Diagnosis and AlarmsDiagnostic messages Setting error 154 Process error alarmFluid empty alarm 155 Self-diagnosis error 156 Output When an Error or Alarm Occurs Maintenance Maintenance and Inspection 158 Check / Replacement of power supply unitProduct disposal Operative life 159 TroubleshootingFlow rate is not indicated 160 Flow rate indication is not correct 161 Flow rate indication is not stable 162 When switch operation is unable = K × B × D × Q Principle of Operation163 164 SpecificationsSpecifications Detector Combined Specifications 165 166 Converter specifications 167 168 169 Model Number Table 170 Gross mass approx lb8kg including a mounting plate Outline Drawing171 Electromagnetic Flowmeter Converter LF232 Type 172 FCF50017