Gebruiksaanwijzing /service van het product L5232 van de fabrikant Toshiba
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6F8A0917 NOTES Before using the equipment, please read this manual carefully and understand the contents, and then use the equipment correctly . • NEVER attempt to operate the equipment in any ways that are not described in this instruction manual.
6F8A0917 - 1 - NOTICE Thank you very much for your purchase of our LF232 T ype Electromagnetic Flowmeter Converter . This instruction manual describes about the precautions required when using the LF232 converter , installation, configuration and mainte nance.
6F8A0917 - 2 - SAFETY PRECAUTIONS Safety signs and labels affixed to the product and/or described in this manual give important information for using the product safely . They help prevent damage to property and obviate hazards for persons using the product.
6F8A0917 - 3 - SAFETY PRECAUTIONS (continued) Safety Precautions for Installation and Wiring Do not use the LF232 in an explosive atmosphere . Use an appropriate device to carry and install the LF232. DON’T Using this product in an explosive atmosphere can cause explosion .
6F8A0917 - 4 - SAFETY PRECAUTIONS (continued) Safety Precautions for Maintenance and Inspection Do not touch the LF232 main body when high temperature fluid is being measured. Do not conduct wiring work when power is applied . DON’T The fluid raises the main body temperature and can cause burns when touched.
6F8A0917 - 5 - Handling Precautions T o obtain the optimum performance from the LF232 converter for years of continuous operation, observe the following precautions. (1) Do not store or install the flowmeter in: • Places where ther e is direct sunlight .
6F8A0917 - 6 - Handling Precautions (continued) (6) The converter housing covers and the cable connections are tightened secu rely at the time of shipment. Do not remove these covers or conn ections unless it is necessary to wire new cables or replace old ones.
6F8A0917 - 7 - T able of Content s 1. Product Inspection and Storage ··················································································· 10 1.
6F8A0917 - 8 - 8. Parameter Settings / Adjustment ················································································· 55 8.
6F8A0917 - 9 - 10.4 Flow Rate High/Low Limit Alarm Output ··································································· 138 10.
6F8A0917 - 10 - 1. Product Inspection and S torage 1.1 Product Inspection The LF232 electromagnetic flowmeter is shipped in a cardboard box filled with cushioning materials.
6F8A0917 - 11 - 2. Overview The electromagnetic flowmeter is an instrument to measure the volumetric flow rate of conductive fluids using Faraday's law of electromagnetic induction.
6F8A0917 - 12 - 3. Names of Part s Appearance Mounting plate Display section Operation switch (Infrared switch) Converter cover Converte r cover mounting screw Mounting plate Cable connection for sign.
6F8A0917 - 13 - Internal structure (with converter cover opened) Display section (LCD) Operation switch (Infrared switch) Fuse holder Power swit ch Terminal block Prote ction cover.
6F8A0917 - 14 - T erminal block construction Detector connection terminals Digital I/O terminals Power supply terminals Power swit ch Protection cover Internal ground term inal Fuse holders The labe l shown left is p laced near the terminal board for po wer supply on the converter .
6F8A0917 - 15 - 4. Inst allation Cautionary notes on installation Do not use the LF232 in an explosive atmosphere . Use an appropriate device to carry and install the LF232.
6F8A0917 - 16 - 4.1 Cautionary Notes on Selecting the Inst allation Location (1) A void places within the immediate proximity of the equipm ent producing interference to measurement (such as motors, transformers, ra dio transmitters, electrolytic cells, or other equipment causing electromagnetic or electrostatic interference).
6F8A0917 - 17 - 4.2 How to Inst all the Converter The converter can be mounted on a panel, wall or on a pi pe stand. Install the converter so that the front of the converter cover stays vertically straight and the cable ports of the converter stay at the bottom.
6F8A0917 - 18 - Figure 4.2 Example of Pipe Mounting 14.57 (370 ) M10 U bolt, etc 2” (50A) PIPE Unit: inch (mm) 2.91 (74).
6F8A0917 - 19 - 5. Wiring Cautionary notes on wiring urn off mains power before working on pipes. Install a switch and fuse to isolate the LF232 from mains power . DO W orking on p ipes while power is applied can cause electric shock . DO Power supply from mains power can cause electric shock or circuit break-down.
6F8A0917 - 20 - (4) If the converter needs to be installed in a loca tion where watertight installation is required, make unused cable ports watertight. (Be careful that th e attached blind plate is used for dustproof purpose and it is not effective for watertight installation.
6F8A0917 - 21 - 5.2 External Connections The external connections of the converter are shown in Figure 5.1. See 5.4 “W iring Method” to connect the cables correctly Terminal block IV wire 5.
6F8A0917 - 22 - 5.3 Cautionary Notes on W iring 5.3.1 Cautionary Notes on Wi ring between Detector and Converter • Flow rate signal cable and excitation cable are attached to the detector . Be sure to use the attached cables. Note: If the length of the cables exceeds 30m, the cables may not be attached.
6F8A0917 - 23 - 5.4 Wiring Method Do not conduct wiring work when power is applied . Do not work on piping and wiring with wet hands . DON’T W iring while power is applied can cause electric shock . DON’T W et hands may result in elect ric shock .
6F8A0917 - 24 - Connecting the input signal cable Strip the sheath from the end of each wire of a 2- core individually shield ed cable as shown in Figure 5.3 and attach and crimp an M4 crimping te rm i nal with insulating sleeve to the end of each wire.
6F8A0917 - 25 - Power cable, current output cable and digital I/O cables Necessary cables should be purchased and prepared by the agent in charge of ins tallation. Strip the sheath from the end of each wire and attach and crimp an M4 crimping terminal with insulated sleeve to the end of each wire.
6F8A0917 - 26 - Referring to 5.2 "External Connections," connect each cable to the terminal block. T ighten the screws of the terminal block tightly to make them secure ly connected. A loose connection may cause incorrect measurement. After connecting each cable, try to pull it to check whether it has been connected securely .
6F8A0917 - 27 - 5.4.3 Grounding The external ground terminal of the detector and th e FG term inal of the converter (or external ground terminal of the converter) must be grounded secu rely with Class D groun ding (grounding resistance 100 Ω or less).
6F8A0917 - 28 - ABX G Y E Converter terminal block Extern al groun d term inal Twisting shields Input signal cable Twisting shields Excitation c able Detector terminal block ABX GE Y F G Ground termi nal Class D grounding (Ground resistance 100 or less) Figure 5.
6F8A0917 - 29 - 5.5 Digit al I/O Connections Digital I/O terminals consist of four contact out put ter minals (DO1 to DO4) and two voltage signal input terminals (DI1 and DI2), and each term inal is isolated from internal circuits. The terminal CO2 is the signal common for DO2 to DO4 and the terminal CI is the signal common for DI1 and DI2.
6F8A0917 - 30 - 5.6 Cautionary Notes on Replacing Converter 5.6.1 Replacing the LF230 Converter The following precautions must be taken to re place the conventional type LF230 with LF232.
6F8A0917 - 31 - 5.6.2 Combination with an Existing Detector (for Large Meter Size) When the LF232 flowmeter converter (LF232*B for large me ter size) is combined with an existing detector of commercial power excitation method, the ex citation current may not be come stable because of the d ifference of the excitation method.
6F8A0917 - 32 - 5.6.3 Replacement of partiall y filled pipes type When detector of partially filled pipes type is replaced from LF502 or LF502(FS2 type) to LF232*F, please be careful to the following p oints.
6F8A0917 - 33 - • Wirering ・ Hole position of cable connection mouth of LF 232* F is the same as LF502 (type FS2). ・ Because specifications of cable connection mouth are di fferent in the following po ints, Please be careful.
6F8A0917 - 34 - 6. Operation Do not touch the LF232 main body when high temperature fluid is being measured. DON’T The fluid raises the main body temperature and can cause burns when touched.
6F8A0917 - 35 - Note: If the fluid to be measured is not filled in the detector pipe (When detector is partially filled pipes type, water level is not enough), flow rate becomes inconsistent and measurement cannot be performed correctly . Be sure to use the flowmeter while the fluid to be measured is filled in the detector pipe.
6F8A0917 - 36 - 7. Display and Controls For the LF232 converter , the measured value can be displayed and the parame ters can be checked or set using the LCD display and operation switches.
6F8A0917 - 37 - 7.1 Names and Functions of Display and Controls Display Operation switch (Infrared switch) Figure 7.2 Display and Controls LCD display A 16-character × 2-line liquid crystal display with backlight is used. Instantaneous flow rate and total flow , and various constants such as parameters can be displayed.
6F8A0917 - 38 - Instructions The operation principle of infrared switch is to irradiate infrared to the front of control panel and detect th e reflection from finger when operating. Normal operation is impeded depend ing on the conditions such as disturbing light from surroundings or st ain attached to the control panel.
6F8A0917 - 39 - Functions of each switch Switch Basic function • Moves the m ode from the m easurement mode to menu display 10 .00 m/s 10 0.0 % ENTER 111 000 (Measurement mode) (Menu lock cancellation screen) • Moves the m ode to the setting, calibrat ion or measurement m ode A 1:EX CURR A1:EX CURR 0.
6F8A0917 - 40 - Note : There is not this screen to t he converter before serial No.07232099 9. ( Menu screen is displayed. Menu lock cancellation screen is not displayed. ) Switch Basic function • Returns the screen from the parameter display screen to the menu display screen.
6F8A0917 - 41 - (2) T o tal count display F 9 9 9 9 9 9 9 9 C “C” is displayed when cou nting is in progress. T otal value is displayed in th e unit of count When the count exceeds the maxim um value of 99999999, the coun t will be reset to 0 and will be counted again.
6F8A0917 - 42 - Notes on total flow value display Note 1: The total flow value and the total diffe rence flow value are displayed to the least significant digit of the set count rate. Example: When the set count rate is 0.0001 m 3 T otal flow / total difference flow display becomes and the value increases in increments of 0.
6F8A0917 - 43 - (7) Error message / other message display E X C U R R E N T O P E N If an error or alarm condition occurs, a message is displayed in the 2nd line. (8) Fixed output display * F I X O U T 2 0 . 0 m A In the fixe d output mode, a m essage is displayed i n the 2nd line.
6F8A0917 - 44 - (2) Mode switching operation flow MENU/ENT , , and CANCEL shown in the flow diagram below indicate the switch operations and when the indicated switch is pre ssed, the process moves to the item indicated by the corresponding arrow Æ .
6F8A0917 - 45 - Note 1: If password is set, the password selection screen appears. For details, see 7.3.3, “P a ssword Input.” Note 2: If no operation is performed for one minute while the mode se.
6F8A0917 - 46 - 7.3.2 Setting Mode Operation Proceed as follows to select the desired item and check or change the setting values. * Switch operation indicates the switches to press. Moving to the menu display Switch operati on Display exam ple Description − 10.
6F8A0917 - 47 - T o return from the menu disp lay to the measurement mode Switch operati on Display exam ple Description C0: MEAS MODE Set the digit of number for function nu mber to “0” by pressing and (Note2). The digit of letter can be set to any letter .
6F8A0917 - 48 - Checking or changing the setting values Switch operati on Display exam ple Description C2 : RANGE 1 Menu dis play Select the desired i tem to check or cha nge using and . C2 (RANGE 1) in this example. C2: RANGE 1 2.00000 m/s Press MENU/ENT to decide the item to check or change.
6F8A0917 - 49 - 7.3.3 Password Input The password function is provided in the LF232 co nverter to prevent some functions that affect the flow measurement from being used or adjusted. If password is set, totalizer cannot be reset. For the setting menu limited by the password, see 7.
6F8A0917 - 50 - Example of password input (mode se lection: SET and password: 123) Switch operati on Display exam ple Description INPUT PASSWOR D 0 00 The password input screen ap pears from the measurement mode. The cursor appears. Pressing CANCEL , the screen returns to the mode selection screen.
6F8A0917 - 51 - 7.3.4 T otalizer Operation In the totalizer operation mode, the totali zer can be started, stopped and reset. If password is set (if password input does not matc h), the totalizer can be started or stopped but it cannot be reset. Note: T o operate the totalizer , it is necessary to set necessary settings for the totalizer .
6F8A0917 - 52 - Example of totalizer operation Switch operati on Display exam ple Description − 10.00 m/s 100.0% (Measurement mode) ENTER111 0 00 V**** Pressing MENU/ENT in the measurement mode for 3 seconds or more, the sc reen moves to the me nu lock cancellation screen.
6F8A0917 - 53 - 7.3.5 Maintenance Menu If you enter the service code to release the protecti on, the maintenance specifi c items in the setting mode that are not displayed normally can be accesse d and the parameters that are normally prohibited to be rewritten can be changed.
6F8A0917 - 54 - 7.4 Setting Menu List The constants set in the LF232 converter can be check ed or changed in the order shown in the table below . The details of each item are descri bed in the following sections: • Setting items (A to M): Chapter 8.
6F8A0917 - 55 - 8. Parameter Settings / Adjustment 8.1 Parameter Setting Items T o check or change each constant set in the LF 232 converter , first select the desir ed setting item described in 7.3.2, “Setting Mode Operation.” For setting mode items, follow the explan ation below to perform the settings.
6F8A0917 - 56 - No. Setting item Display example 8.2.16 Preset c ount value Output function setting I1: PRESET CN T I2: PRESET FN C 00009000 1:HOLD High/Low limit alarm On/Of f High/Low limit alarm value J1: H ALM SET J2: H ALM VAL 1:ON +100.
6F8A0917 - 57 - Changing the exciting current value T o change the excitin g curr ent value, procee d as follows. Howev er , the exciting current v alue is already adjusted whe n the product is s hi pped from the factory . Do not chan ge t he exciting curr ent value unles s the value is different from the one descr ibed on the detector nameplate.
6F8A0917 - 58 - 8.2.2 Meter Size Checking the meter size of the detector Proceed as follows to check or cha nge the meter size of the detector . Switch operati on Display exam ple Description A2: METER SIZ E 50 mm Select A2: METER SIZE from the setting item selection menu.
6F8A0917 - 59 - Changing the meter size of the detector The following is an example to cha nge the meter size from 50mm to 10mm . Switch operati on Display exam ple Description A2: METER SIZ E 50 m m Select A2: METER SIZE from the setting item selection.
6F8A0917 - 60 - 8.2.3 Exciting Frequency The exciting frequency can be selected from 6Hz, 12H z and 24Hz. Since the features shown below are apparent depending on the exciting frequency , select an appropriate exciting frequency .
6F8A0917 - 61 - Changing the setting value for exciting frequency . The following is an example to change the exciting frequency from 24Hz to 12H z. Switch operati on Display exam ple Description A3: EX. FREQ. 24 Hz Select A3: EX FREQ. from the setting item selection menu.
6F8A0917 - 62 - 8.2.4 Flow Direction The flow direction of fluid can be set. Normally use the flowmeter under the condition of NORMAL. Selection item Description 1: NORMAL The flow is a direct flow when the fluid flows in the direct ion indicated by the arro w on the detector .
6F8A0917 - 63 - Changing the flow direction. The following is an example to show how to change the flow direction from NORMAL to SWITCH. Switch operati on Display exam ple Description A4: FLOW DIRC TN 1:NORMAL Select A4: FLOW DIRCTN from the setting item selection menu.
6F8A0917 - 64 - 8.2.5 Password Setting The password function is provided to prohibit the setti ngs and adjustment for the functions that affect the flow measurement.
6F8A0917 - 65 - Changing the password The following is an example to show how to change the password from 123 to 453. Switch operati on Display exam ple Description A5: PASSWORD 123 Select A5: P ASSWORD from the setting item selection menu. The currently set password data ( 123 in this example) appe ars.
6F8A0917 - 66 - 8.2.6 Normal Indicating Unit Y ou can select one of the units listed below as nor mal indicating unit for 2 types of units, m ain unit (UNIT 1) and sub unit (UNIT 2) to be displayed in the measurement mode.
6F8A0917 - 67 - Checking the normal indicating unit The following is an example to change the main indicating unit (UNIT1) from % to ml/s. In the case of sub unit (UNIT2), select the function “B2: UNIT 2.” Switch operati on Display exam ple Description B1: UNIT 1 % Select B1: UNIT 1 from th e setting item selection menu.
6F8A0917 - 68 - Changing the flow direction for total flow Proceed as follows to change the flow direction for total flow . The following is an example to show how to ch ange the main indicating unit from Forward flow (F) to Forward/Rverse automatic switching (B).
6F8A0917 - 69 - 8.2.7 Custom Unit The custom unit, which indicates the flow rate multiplied by an arbitrary coefficient, can be defined. The flow rate indication using the custom unit define d here can be used b y selecting CUSTOM in the indicting unit setting.
6F8A0917 - 70 - Checking the coefficient of custom unit Proceed as follows to check the coefficient of custom unit. Switch operati on Display exam ple Description B3: CUSTOM DA TA 12340.00 Select B3: CUSTOM DA T A from the setting item selection menu.
6F8A0917 - 71 - Checking the unit string of custom unit Proceed as follows to check the unit string of custom unit. Switch operati on Display exam ple Description B4: CUSTOM UN IT AAA/BBB Select B4: CUSTOM DA T A from the setting item selection menu. The currently set un it appears.
6F8A0917 - 72 - 8.2.8 S pan V alue (Range) The following constants are set here. (1) Range type (2) Span unit (changeable only for Range 1) (3) Span value (4) Hysteresis Range type By selecting the ra.
6F8A0917 - 73 - S pan value The span value can be set using the actual flow rate unit (m 3 /h, etc.) and flow velocity unit (m/s). (1) Setting range The span value can be set within the range of 0 –1.0 ft/s to 0 – 32.8 ft/s (0.1m/s to 10m/s) in term s of flow velocity (The range that detector can measure changes w ith detector type.
6F8A0917 - 74 - Hysteresis The dead band, which is used to switch the ra nges in the case of internal automatic switching multi-range, is set here. It is not necessary to set hysteresis in other range types. (The set value will be ignored.) The hysteresis can be set within the rang e of 0 to 25% in increments of 0.
6F8A0917 - 75 - Checking each constant How to check the Range 1 is shown here. T o check other setting values, select the following function num bers: Range type C1: RANGE TYPE Range 2 span value C3: .
6F8A0917 - 76 - Changing the range type Before changing the span value, Rang type m ust be set. The following is an example to show how to ch ange the range type from Single range (1:SINGLE) to the bidirectional internal si gnal switching multi-range (3:2F-2R).
6F8A0917 - 77 - Changing the span value The span value for each range is set. The following is an example to show how to change the span value of Range 1 from 2.0m 3/h to 100 l/min. Switch operati on Display exam ple Description C2: RANGE 1 2.0000 m3/h Select C2: RANGE 1 from the setting item selection menu.
6F8A0917 - 78 - Changing the hysteresis The hysteresis value is set to 3% unless otherwis e specified when the converter is shipped from the factory . The following is an example to show how to change the hysteresis value from 3% to 5%. Switch operati on Display exam ple Description C6: RANGE HYS T 03.
6F8A0917 - 79 - 8.2.9 Damping Constant The damping constant is set to average out the out put fluctuations. ( The larger the damping constant, the more the output is averaged and the fluctuations can be reduced but the response becomes slower .) The damping constant can be set from 0.
6F8A0917 - 80 - Changing the damping constant The following is an example to show how to cha nge the damping constant from 0.5 sec to 10 sec. Switch operati on Display exam ple Description D1: DAMPING 00.5 s Select D1: DAMPING from the setting item selection menu.
6F8A0917 - 81 - 8.2.10 Low Cutof f value The low cutoff is the fuction to f orcefully fix th e current output to 0% when the flow rate becomes equal or below the low cutoff value set near 0%. The low cutoff value can b e set from 0 to 10% and in increments of 0.
6F8A0917 - 82 - Changing the low cutoff value The following is an example to show how to ch ange the low cutoff value from 1.0% to 3.0%. Switch operati on Display exam ple Description D2: LOW CUT 01.0 % Select D2: LOW CUT from the setting item selection menu.
6F8A0917 - 83 - 8.2.1 1 Current Output Setting Used When an Alarm Occurs The current output value setting used when an alarm occurs is the function to fix the current output to a pre-selected value if a fluid empty alarm or a self-diagnosis alarm occurs.
6F8A0917 - 84 - Changing the current output value used when an alarm occurs The following is an example to show how to cha nge the current output value, which is used when an alarm occurs, from 4.0mA (2: 4.0mA) to 24.0mA or more (4: OVER 24.0mA). Switch operati on Display exam ple Description D3: 4-20 ALM.
6F8A0917 - 85 - 8.2.12 Display low cut On/Of f When the low output is cutof f by the setting in 8.2. 10 “Low cutoff value,” whether the instantaneous flow rate, flow velocity and % value shoul d be set to zero or not can be selected.
6F8A0917 - 86 - Changing the display low cut On/Off setting. The following is an example to show how to change the display low cut setting from 2.OFF to 1:ON. Switch operati on Display exam ple Description D4: DSP LOW C UT 2:OFF Select D3: 4 − 20 ALM.
6F8A0917 - 87 - 8.2.13 Output Low Limit Setting The low limit for 4 to 20mA output can be selected. If 3.2mA or 2.4mA is selected, the output value of less than 4mA (0%) can be output when the flow is in reverse direction. The output low limit setting can be selected from the items shown in the table below .
6F8A0917 - 88 - Changing the output low limit value setting. The following is an example to change the output low limit setting from 4.0mA (1: 4.0mA) to 3.2mA (2: 3.2mA). Switch operati on Display exam ple Description D5: LOW LIMIT 1:4.0mA Select D5: LOW LIMIT from the setting item selection menu.
6F8A0917 - 89 - 8.2.14 Digital I/O Function Digital I/O functions can be selected. Select the digital I/O functions from the items shown below . For details of digital I/O functions, see 10. “Function Description.” Digital output functions (co rresponding to each terminal) DO FUNCT .
6F8A0917 - 90 - Digital Input Function DI FUNCT . Digital input fun ction 1: NO USE Not used 2: C ST A/STP T otalizer Start/Stop control 3: C RES/ST A T otalizer Reset/Start control 4: RANGE S W1 Mult.
6F8A0917 - 91 - Checking each setting for digital I/O The following is an example to show how to check the function setting of Digital Output 1. T o check other setting values, select the following function num bers.
6F8A0917 - 92 - Changing each setting for digital I/O The following is an example to show how to ch ange the function of Digital Output 1 from High limit alarm output (2:HIGH ALM) to Fluid empty alarm (A:EMPTY ALM). T o change other setting values, se lect the following function num bers.
6F8A0917 - 93 - 8.2.15 Count Rate (Pulse Rate) and Pulse Width T o talizer is incremented each time a volumetric flow set for predeterm ined count rate enters and one pulse is sent out through DO output.
6F8A0917 - 94 - 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.
6F8A0917 - 95 - Checking the count rate and pulse width How to check the count rate setting is shown below . T o check other setting values, select the following function num bers: Pulse width mode H2: PLS MODE Pulse width H3: PLS WIDTH Switch operati on Display exam ple Description H1: COUNT RAT E 1.
6F8A0917 - 96 - Changing the pulse width mode setting The following is an example to change the pul se width mode setting from 2:MANUAL to 1:AUTO. Switch operati on Display exam ple Description H2: PLS MODE 2:MANUAL Select H2: PLS MODE from the setting item selection menu.
6F8A0917 - 97 - Changing the pulse width The following is an example to change the pulse width from 100ms to 250m s. Switch operati on Display exam ple Description H3: PLS WIDTH 100.0 ms Select H3: PLS WIDTH from the setting item selection menu. The currently set pulse width appea rs.
6F8A0917 - 98 - 8.2.16 Preset Counter Preset counter is the function to output a signal th rough DO when the totalized count reaches a preset value. For details of preset counter function, also see 10.
6F8A0917 - 99 - Checking the preset counter setting How to check the preset count value is shown below . T o check the preset output function, select the function “I2: PRESET FNC.” Switch operati on Display exam ple Description I1: PRESET CN T 00000300 Select H1:PRESET from th e setting item select menu.
6F8A0917 - 100 - Changing the preset output function The following is an example to show how to change the preset output function from Output state hold (1/HOLD) to One-shot pulse output (2:50m s PULSE). Switch operati on Display exam ple Description I2: PRESET FN C 1:HOLD Select I2:PRESET FNC from th e setting item selection menu.
6F8A0917 - 101 - 8.2.17 Flow Rate High/Low limit Alarm The flow rate high/low limit alarm is the function to generate an alarm when the instantaneous flow rate exceeds a preset high limit value (or low limit value). When an alarm is generated, an alarm message is displayed and a signal can be output through DO.
6F8A0917 - 102 - Checking the high/low limit alarm setting Proceed as follows to check the high/low limit alarm setting. The following is how to check whether the high limit alarm is provided (On) or not (Off).
6F8A0917 - 103 - Changing the high/low limit alarm On/Of f The following is an example to change the high limit alarm setting from OFF to ON. T o change other high/low limit alarm On/Off setting, select the following functi ons.
6F8A0917 - 104 - Changing the high/low limit value The following is an example to change the high lim it value from +105% to +103%. T o change other high/low limit value setting, select the following functions.
6F8A0917 - 105 - 8.2.18 Fluid Empty Alarm Fluid empty alarm is the function to gen erate an al arm when a condition is detected in which fluid is not filled or water level is not enough in the measuring pipe of the flowmeter . If an alarm is generated, an alarm message is displayed and a signal can be output through DO.
6F8A0917 - 106 - Changing the fluid empty alarm On/Of f setting. The following is an example to change the fl uid empty alarm setting from Alarm On (1:NORMAL) to Alarm Off (0:OFF). Switch operati on Display exam ple Description L1: EMPTY ALM 1:NORMAL Select L1:EMPTY ALM from the setting item selection menu.
6F8A0917 - 107 - 8.2.19 Self-Diagnosis Function Self-diagnosis function is the functi on to generate an alarm if an error is found from the result of diagnosis of internal circuits, memory , etc. If an alarm is generated, an alarm message is displayed and a signal can be output through DO.
6F8A0917 - 108 - Alarm output factor setting When the diagnosis alarm is output through DO, wh ether a fluid e mpty alarm should be added to the condition for alarm output can be selected.
6F8A0917 - 109 - Changing the self-diagnosis function setting The following is an example to change the sel f-diagnosis function from Se lf-diagnosis function On (1:ON) to Self-diagnosis function Off (2: OFF). T o change the setting for alarm output factors, select the function “L3: ALM PRESET .
6F8A0917 - 11 0 - 8.2.20 Rate-of-Change Limit V alue and Control T ime The rate-of-change limit is the function to prevent a sudden change in flow indication of t he converter when the measurement flow signal contains excessive noise.
6F8A0917 - 111 - Changing the rate-of-change limit setting The following is an example to change the limit value from 1.0% to 1.5%. T o change the control time, select the function “M2: LIMIT TIME.” Switch operati on Display exam ple Description M1: LIMIT RAT E 1.
6F8A0917 - 11 2 - 8.3 Initial Settings When Shipped from the Factory Initial settings used when shipped from the factor y unless otherwise specified are shown below .
6F8A0917 - 11 3 - No. Parameter name Initial setting values H1 Count rate Meter size 1/10" to 1/4" ( 2.5 to 6 mm) 1L Meter size 1/2" to 1 1/2” ( 15 to 40 mm) 0.
6F8A0917 - 11 4 - 8.4 Fixed V alue Output (Loop Check) The fixed value output is the function to outp u t a fixed current and/or a fixed pulse output independently of the flow rate signal.
6F8A0917 - 11 5 - Fixed pulse output value The pulse frequency is set, which is used to ou tput in the fixed out put mode through the DO terminal where the pulse output function is set. The fixed pulse output value can be set within the range of 0 to 100 0pps in increments of 1pps.
6F8A0917 - 11 6 - Changing the fixed output function The following is an example to change the fixed output function fr om Fixed value output OFF to ON and then go on to set the current output value and the pulse output value.
6F8A0917 - 11 7 - Changing the fixed output constant The following is an example to change the fixed pulse output value from 50pps to 100pps. T o change the fixed current output value, select the function “L2: FIX. CURR.” Switch operati on Display exam ple Description L3: FIX.
6F8A0917 - 11 8 - 8.5 Zero Adjustment 8.5.1 S till W ater Zero Adjustment Still water zero adjustm ent must be performed when the fluid in the measuring pipe of the detector stays still. Switch operati on Display exam ple Description − 10.00 m/s 100.
6F8A0917 - 11 9 - E0 : MEAS MODE Returns to the measurement m ode (measured val ue display screen). 10.00 m/s 100.0 % Note1: If the flow rate value is outside of the ran ge of ± 1.25 m/s, the adjustment resu lt will not be reflected on th e flow rate measured value.
6F8A0917 - 120 - 8.5.2 Zero Offset Adjustment This function is used to perform zero adjustm ent simply by comparing the output of the flowmeter with other process value without stopping the process flow . If zero adjustment can be performed with still water cond ition, it is not necessary to set this adjustment value.
6F8A0917 - 121 - Changing the zero offset adjustment value Changing the zero offset adjustm ent value from +1.0% to − 2.5%. Switch operati on Display exam ple Description O1: MANUAL ZE RO +001. 0% Select O1: MANUAL ZERO from the setting item selection menu.
6F8A0917 - 122 - 9. Mag-Prover Calibration 9.1 Calibration Items The calibration mode of the LF232 flowmeter converter is used to check or perform zero and span calibration of the converter and check the exciting cu rrent. T o change the mode to the calibration mode, select the setting item in accordance with the procedure in 7.
6F8A0917 - 123 - 9.2 Converter Check / Calibration 9.2.1 0% Flow Rate Calibration (Zero Calibration) Using Mag-Prover internal calibration circuit, 0% flow rate (hereafter called zero poi nt) calibration can be performed. Checking the zero point Switch operati on Display exam ple Description P1:FLOW CAL 0 0.
6F8A0917 - 124 - 9.2.2 50% Flow Rate Calibration 50% flow rate value can be checked only . Checking the 50% flow rate value Switch operati on Display exam ple Description P2:FLOW SIG 5 0 50.1 % Select P2:FLOW SIG 50 from the calibration item selection menu.
6F8A0917 - 125 - 9.2.3 100% Flow Rate Calibration (Span Calibration) Using the Mag-Prover internal calibration circuit, 100% flow rate value (hereafter called the span value) calibration can be performed. Checking the span value Switch operati on Display exam ple Description P3:FLOW CAL10 0 100.
6F8A0917 - 126 - 9.2.4 Checking the Exciting Current V alue The monitor value of the exciting current can be checked. Checking the exciting current value Switch operati on Display exam ple Description P4:EX CURR DS P 0.2100 A Select P4:EX CURR DSP from the calibration item selection menu.
6F8A0917 - 127 - 10. Function Description The LF232 flowmeter converter is equipped with 4 dig ital outputs and 2 digital inputs (1 digital output as standard), enabling you to use these as various functions such as pulse outp ut and alarm outputs. Digital I/O functions are described below .
6F8A0917 - 128 - 10.1 Digit al I/O Specifications The specifications of the digital I/O terminals of the LF232 co nverter are as follows: Digital Outputs: (DO1) Output type T ransistor open collector .
6F8A0917 - 129 - 10.2 T ot alizer and Pulse Output Proceed as follows to use the totalizer and pulse output. Count Rate and Pulse W idth Settings Follow the procedure in 8.2.15 “Count Rate (Pulse Rate) and Pulse W idth” and set the flow rate per 1 count (1 pulse) (count rate), pulse width m ode and pulse width.
6F8A0917 - 130 - * Continued from the previous page Clear (reset) the totalizer . (Note1) Press switch to clear the count. If you have changed the count rate, clear (reset) the count before you start the totalizer . Start the totalizer . (Note1) • Press to start the totalizer .
6F8A0917 - 131 - T otalizer operation usi ng digit al input signals T o talizer and pulse output can be operated. Remote operations of the totalizer and pulse outp ut can be performed using the Digital Input signals. Follow the procedure in 8.2.14 “Digital I/O Func tion” and set the Digital Input (DI) functions.
6F8A0917 - 132 - 10.3 Multi-Range Functions Five types of multi-range functions can be set using the Range T ype: Range T yp (1) Single direction, 4 ranges Internal automat ic switching (2) Forward an.
6F8A0917 - 133 - Output performance when multiple ranges are used (1) Single direction (internal automatic switching), 4 ranges 20mA 4mA 0 0 100 125 Output (%) Range output No.
6F8A0917 - 134 - (2) Forward and reverse directions (i nternal automatic switching), 2 ranges Output when switched from Reverse to Forward direction Output when switched from Forward to Reverse direction OFF ON Range output No. 2 Reverse direction Flow rate 4mA 0 0 Output Forward direction Low cutoff 1.
6F8A0917 - 135 - (3) Single direction (external signal switching), 2 ranges 0 125 100 4mA 0 Outpu t (%) Range 2 Range 1 ON OFF Reverse direction Flow rate Forward direction (Range output No. 1) H level input External range switching signal L level input • Current output is 4mA as standard wh en fluid flows in reverse direction.
6F8A0917 - 136 - (4) Forward and reverse directions (external signal switching), 2 ranges 4mA 0 100 125 0 Output (%) Range 2 Range 1 Reverse direction Flow rate Forward direct ion Range 3 Range 4 ON OFF (Range output No. 1) H level input External range switching signal L level input (Range output No.
6F8A0917 - 137 - (5) Single direction (external signal switching), 4 ranges 20mA 4mA 0 0 100 125 Output (%) Range 4 Range 3 R ange 2 Range 1 Reverse direction F orward direction Flow rate Exter nal range s witchi ng signal No. 1 Exter nal range s witchi ng signal No.
6F8A0917 - 138 - 10.4 Flow Rate High/Low Limit Alarm Output Proceed as follows to use the flow rate high/low limit alarm. High/Low Limit Alarm V alue Setting • Follow the procedure in 8.2.17 “Flow Rate High/Low alarm” and set the high li mit alarm, high-high limit alarm , low limit alarm or low-low limit alarm to ON and set the alarm value.
6F8A0917 - 139 - • In the case of Multi-range setting Output (%) High l imit set- pout value Low limit set- point value Range 2 Range 1 Range 2 Hysteresis 2.
6F8A0917 - 140 - • In the case of 2 high limit alarm points (high lim it and high-high limit) Output (%) High-high limit set- point High limit set-point Hysteresis 2.5% High limit alarm gener ated High-high limit alarm generated Time * The output state when an alar m occurs becomes the state set for alarm output of digital out put.
6F8A0917 - 141 - 10.5 Fluid Empty Alarm Output Proceed as follows to use the fluid empty alarm. (Note: In the case of LF232*F; Fluid empty alarm f unction is not usable. Set this function 'OFF'.) Alarm Output Setting • Follow the procedure in 8.
6F8A0917 - 142 - 10.6 Preset Counter Output Function A contact signal is output when the totalized flow count exceeds the preset value (preset count value). Proceed as follows to use the preset counter output. T o talizer Setting • Follows the procedure in 10.
6F8A0917 - 143 - Preset counter output performance • Example to reset the totalizer using an external signal input (When preset output level hold (Contact ON) is set) ON OFF 0 Reset/Start signal (DI.
6F8A0917 - 144 - • Example to reset the totalizer using an external signal input (When one-shot pulse output is set) ON OFF 0 Reset/Start signal (DI control signal level L) Totalizer flow count Preset output Counter reset Counter start H level input L level input Preset count set-point Counter reset Preset output is OFF because Counter is reset.
6F8A0917 - 145 - • Output example of one-shot pulse output ON OFF 0 100 200 Preset count set-point value: 10 0 Totalizer count Preset output Preset output OFF because pulse width is reached.
6F8A0917 - 146 - 10.7 Remote Still W ater Zero Adjustment Still water zero adjustm ent can be pe rformed using an external signal. T o use this function, follow the procedure in 8.2. 14, “Digital I/O Function” and set the DI as a zero adjustment start signal.
6F8A0917 - 147 - 10.8 Remote Selection of Fixed V alue Output 4 to 20mA output and pulse output can be set to a fixed preset value using a remote signal input. Proceed as follows to use this function. Fixed Output V alue Setting • Follow the procedure in 8.
6F8A0917 - 148 - 10.9 Converter Error Alarm Output If one or more of the following errors occur in a self-diagnosis sequence, an alarm signal will be output using contact signals.
6F8A0917 - 149 - 1 1 . Communications Function The LF232 Series Converters are equipped with HAR T *1 protocol to transmit digital signals over the 4 to 20mA output line.
6F8A0917 - 150 - Conv erter ter minal b lock HHT Figure 1 1.2 Connection to the Converter Main Unit.
6F8A0917 - 151 - 1 1.2 Procedure for Communication with HHT This section describes the HHT basic operations for comm unication between the flowmeter and HHT . For details, refer to the HHT instruction manual. * Carry ing out the following preparatory operations to a co mmercially available PDA (OS: W indows CE), the PDA can be used as a HHT .
6F8A0917 - 152 - 1 1.3 Cautionary Notes on Communications Observe the following limitations when you communicate with flowm eter using HHT . Current output load (1) Load resistance: 240 Ω to 1k Ω (including communications line resistance) (2) Load capacitance: 0.
6F8A0917 - 153 - 12. Diagnosis and Alarms 12.1 Diagnostic messages The LF232 converter is equipped with the function t o di agnose such errors as setting errors, I/O errors or internal errors of the instrument and shows th e error messages on the LCD display or on the HHT through communications.
6F8A0917 - 154 - Process error alarm LCD display Description Corrective action OVER 125% The measured value is above the 125% of the span. The setting range for measured value is narrow or the flow rate is unexpectedly lar ge. Check whether the set value is correct or not and check that there is no problem in the process.
6F8A0917 - 155 - Self-diagnosis error The converter performs an operation check immediately after power is turned on and if an error is found, a self-diagnosis error is generated. If more than one error occurs at the same time, the contents of those errors will be displayed cyclically .
6F8A0917 - 156 - 12.2 Output When an Error or Alarm Occurs Error indication Measured value display Current output (4 to 20m A) T otalizer pulse output Remarks ROM ERROR (Note 1) − 4mA (s tandard) (Note 3) St opped After power-up, measurem ent does not start.
6F8A0917 - 157 - 13. Maintenance and Inspection Do not conduct wiring work when power is applied . Do not touch the LF232 main body when high temperature fluid is being measured. DON’T W iring while power is applied can cause electric shock . DON’T The fluid raises the main body temperature and can cause burns when touched.
6F8A0917 - 158 - Check / Replacement of power supply unit In general, electronic components deteriorate faster if the ambient temperature is high. The life of the power supply unit is about 10 years if the am bien t temperature is 40°C, and 5 to 6 years if the temperature is 50°C or more.
6F8A0917 - 159 - 13.2 T roubleshooting If a problem occurs, you may find a cause of the problem by performing the simple inspection. Before you call repair service personnel, inspect the flowmeter using the flowcharts shown below . 13.2.1 Flow rate is not indicated Install the cab les correctly according to 5.
6F8A0917 - 160 - 13.2.2 Flow rate indication is not correct YES Connect the two load resistors in series, if necessary. Contact your nearest Toshiba representative. Aren't there two load resistors conn ected to th e output in parallel? YES NO NO Set it corre ctly according t o 8.
6F8A0917 - 161 - 13.2.3 Flow rate indication is not st able Use a power supply within the specified range. Ground the converter/detector with Class D ground (100 or less ground resistance) using IV wire of 5.5 mm² minimum. Design piping so that the detector pipe is filled with fluid all the time.
6F8A0917 - 162 - 13.2.4 When switch operation is unable START NO Place a cover to block the li g ht from surroundin g s, or cover the control panel by hand to block the light.
6F8A0917 - 163 - 14. Principle of Operation The operating principle of the electromagnetic flowmeter is based on Faraday 's Law of electromagnetic induction. The principle of operation is that an insulated pipe with inner diameter D is placed vertically to the direction of a magnetic fi eld with flux density B (see Figure 14.
6F8A0917 - 164 - 15. Specifications 15.1 Specifications Detector Combined S pecifications 1. Measuring range: (measuring range in term s of flow velocity) 0 –1.
6F8A0917 - 165 - 2. Measurement accuracy: (Accuracy when combined with detector) • Combined detector: LF470 (Meter size 1/10” to 1/4” (2.5 to 6mm )) Range Flow rate to the range (%) 1.0-3.3ft/s (0.3-1.0m/s ) 3.3-32. 8ft/s (1.0-10m/s ) 0 to 50 % ± 0.
6F8A0917 - 166 - 3. Other specifications • Conductivity: 5 μ S/cm or more (If detector is partially fille d pipes type, conductivity i s 100 μ S/cm or more) • Power supply: 100 to 24 0V AC (allo.
6F8A0917 - 167 - • Range switching output One Digital Output (DO) is used • Single direction, 2-range switching signal • Forward/reverse direction switching signal T wo Digital Outputs (DO) are .
6F8A0917 - 168 - 5. Display/setting items • Output display: 16-character × 2-line dot-matrix LCD (with back light) Indicating unit: 2 units can be selected from th e flowing units: flow velocity , instantaneous flow rate, total flow (forward/reverse/di ff erence flow), total count, %, custom unit.
6F8A0917 - 169 - 15.2 Model Number T able LF232*A, LF232*B Converter model number table Model number Specification code 1 2 3 4 5 6 7 8 9 10 1 1 12 Description L F 2 3 2 Separate type converter P u r p o s e A S t a n d a r d Com patible detector (Note 1) (N ote 2) (Note 3) A M e d i u m t o s m a l l s i z e (Meter size: 1/10” to 18”(2.
6F8A0917 - 170 - LF232*F (for p artially filled pipes detectors) Converter model number table Model number Specification code 1 2 3 4 5 6 7 8 9 10 1 1 12 Description L F 2 3 2 Separate type converter .
6F8A0917 - 171 - 16. Outline Drawing Electromagnetic Flowmeter Converter LF232 T y pe Gross mass: approx. 18 lb(8kg) (including a mounting plate) Figure 16.1 Outline of Electromagnetic Flowmeter Converter 232 T ype 2.94(74) 8.74(222) 9.33 (237) 6.10(155) 15.
6F8A0917 - 172 - W rite down the address and phone number of the di stributor from which you purchased this product, the product code, SER.NO. and so on.
FCF50017.
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