Toshiba LF494 User Manual

TOSHIBA

6F8A0774

ELECTROMAGNETIC FLOWMETER

MODEL LF494 / LF404

INSTRUCTION MANUAL

TOSHIBA CORPORATION

TOSHIBA

NOTICK This Manual is designed to assist in installing, operating, and maintaining the LF494/LIH04 electromagnetic: flowmeter, i’or safely reasons, and to obtain the opti mum performance from the flowmeter, read this Manual thoroughly before working with the product. Keep the Manual within easy reach fcjr reference whenever needed.

The flowmeter to which this Manual refers is NOT designed for applications m which the functioning of this product is critical to human safety, such as:

♦ Main cejntro! syaicms of nuclear power plants; safely systems in nuclear facilities

• Control systems of medical equipment, including life support machines.

6F8A0774

or other ciilical control lines directly affecting human safety.

NOTES

L The reproduction of the contents of this Manual in any form, whether wholly or in part, is

not permitted without explicit prior consent and approval.

2. 1’hc information contained in this Manual is subject to change or review without prior notice.

3. Be .sure to follow all safety, operating and handling precautions described in this Manual and ihe regulations in force in the country in which this product is to be used.

HART is a registered trademark of ihe HART Ccrnmunication Foundation, Teflon is a rcgislcrcd trademark of the DuPont Company.

Forth F.dition October. 2000

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TOSHIBA

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 datnagu lo property and obviate hazards for persons using the product, Make yourself familiar with signal words and symbols used for safely signs and labcJs, Then read the safety precautions that follow to prevent an accident involving personal injury, death or damage to property.

Explanation of signal words

The signal word or words arc used to designate a degree or level of hazard seriousness. The ssignal words used for the product described in this manual arc WARNING and

CAUTION.

A WARNING

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Indicates a potentially hazardous situation which, if not avoided, could result in death or i^erious injury.

Safety .symbols

Indicates a potentially hazardous situation

A CAUTION

rhe following symbols are used in safety signs and labels affixed to a product and/or in the

manual for giving safety instructions.

Indicates an action that is prohibited. Simply DON'T do this action. The prohibited action is indicated by a picture or text inside or next to

• Л

the circle Indicates an action that is mandatory, DO this action,

1 he mandatory action is indicated by a picture or text inside or next to

the circle. Indicates a potential hazard. The potentially hazardous situation is

indicated by a picture or text inside or next to the triangle.

w hich, if not avoided, may result in minor lo moderate injuries or in property damage.

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TOSHIBA

SAFETY PRECAUTIONS

Safety Precautions for Installation and Wiring

A WARNING

Do not diNCOTinecl while circuit h live unless k>cntion is known lo be nonhuzardous.

6,F8A0 7 7 4.

DONT

I Oo not modify or disassemble the enclosure,

xdiy Strength dcgtadsition and defects of enclosure can cause explosion.

DONT

Do not use parts of other products.

DONT

Do not live circuits While assembly of all components is not over.

DONT

Install per the National Electrlciil Code for the LS (NEC, ANSI/NFPA 70) and the Canadian Electrical code for Canada (CEC, CAN/CSA>C22J).

Live pari of electric circuit ora high temperature department can cause explosion.

Protective performance degradation for hazardous location can cause

explosion.

Protective performance degradation for hazardous location can cause explosion.

Unsuitable conduit connections for hazardous location can cause ex plosion.

A CAUTION

■ Turn off mains power before working on pipes.

Working on pipes while power is applied can cause

QQ electric shock.

■ Install a switch and fuse to isolate the LF494/LF404 from mains power.

Power supply from mains

power can cause electric

□ 0 shock or circuit breakdown.

■ Use an appnipriate device to carry and install the LF494/LF4Q4.

If this product falls to the ground, injury, or malfunction

of or damage to the product, can be caused.

■ Du not modify or disassemble the LF494/LF404 unnecessarily,

Modifyingordisasscinhling

( this product cart cause electric

shuck, malfunction uf or

DON T damage to this product.

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TOSHIBA

SAFETY PRECAUTIONS (continued)

Safety Precautions for Maintenance and Inspection

CAUTION

■ Turn off mains power before

conducting wiring work.

Wiring while power is applied can cause electric shock,

■ Do not condnet wiring work with bare hands.

Remaining electric charge

■ Ground the LF494/LF404 indepen dently from power equipment,

^^9 grounding can cause electric

■ Use compression terminal lugs with

insulation sleeve for the termmul

block and GND terminal.

I even if power is turned off

DON’T

■ Do not work on piping and wiring w ith wet hands.

f J electric shock.

DON’T

can still cause electric shock.

Wet hands may result in

^|\ pow'cr input.

/ J \ (A black border and symbol on

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Operating this product without

shock or mal fu net ion.

Loose connections can cause electric shock, fire from excessive current or system malfunction.

The label shown left is placed near the terminal board for

yellow triangle) Be alert to electric shock.

■ Do not touch the flowmeter main

body when high temperature fluid is being measured.

The fluid raises the main y^“V Wiring while power is applied

i body temperature and can

cause burns when toucheil.

DON’T

■ Do not conduct wiring work with wet

hands. yy neaj ihe icrininal board for

1 Wet hands may result in

electric shock.

DON’T

■ Do not use a fuse other than the one Use a rated fu.se as follow^] ¡»pvcifled.

Using a fuse other than the

\ one specified can cause

V, ;V system failure, damage or

mal ft! action.

DON’T

■ Do not conduct wiring work when power is applied.

i can cause electric shock.

DON’T

The label shown left is placed

/w\^ power input.

/ (A black border and symbol on

yellow triangle) Be alert to eleciric shock.

Fuse rating:

* 1 A;250V for 100 to 24t)Vacor llOVdc

• 2A^250V for 24 V dc

Dimensions:

Diameter 5.2 inm x 20 mm

Melting time characteristic:

Normal blow |

Disclaimer

Toshiba does noi 9ccep[ liitbility for any dsimagc or loss, msuerial or personal, caused its a direct or indirect result of the operation of this product in connection with, or due to, the occurrence of any event of force majeurc (including fire or earthquake) or the misuse of this product, whether iutcntiounl or aeddentaJ.

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TOSHIBA

Handling Precautions

■ To obiairi the opiimutn pcrforiimnce from the LJ"494/LF4C4 flowmeter for yeiirs of coHtinuou!» operation, observe Ihc following preciiutions.

(1) Do not store or instiiJl the flowmeter in:

(2) Exccjlc wiring securely and correctly,

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• places where there is direct sunlight. If this is unavoidable, use an appropriate

sSunshade,

• places where excessive vibration or mechanical shock occurs,

• places where high i строга lure or high humidity conditions obtain,

■ places where corrosive atmospheres obtain,

• places submerged under water,

To put the flowmeter temporarily on the floor, place ¡t carefully with something to support it so that the tlowmcicr will not topple over,

Ground the flowmeter whth 1Ш ohm or less ground resistance* * Avoid a common ground used with other equipment where earth current may flow. Ал independent ground is preferable

(3) Seal the cable thoroughly at ths cable gland so that the cable is kept airtight. The

apparatus should not be provided with the cable gland. Please prepare yourself lor the cable glands which could he used in Division 2 hazardous locations.

(4) Make sure the fluid to be measured will not freeze in the detector pipe. This can

cause damage to the detector pipe.

{5) Select appropriate wetted materials suited for the process fluid to be measured.

Otherwise, fluid leakage due to corrosion can be caused,

(6) The converter housing covers ¿re lightened securely at the time of shipment. Do

not remove these covers or glands unless it is necessary to wire new cables or re place old ones. Otherwise, gradual deterioration of circuit isolation or damage !o this product can be caused. Tighten the covers securely again if they have hcca re moved.

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TOSHIBA

Handling Precautions (continued)

(7) Observe the lollowing precautions when you open the converter housing cover:

• Do not open the cover in the open air unprotected ugainsi rain or wind, I'his can cause eieciiic shock cr cause damage to the flowmeter electronics,

* Do not open the cover under high ambient teraperaitire or high humidity

conditions or in corrosive atmospheres. This can cause deterioration of system accuracy or cause damage to the flowmeter electronics,

(8) ThisS product may cause interference to radio and television sets if they are

used near the installation site. Use meta! conduits etc, for cables to prevent this interference.

(9) Radio transmitters such as transceivers or cellular phones may cause interference

to the flowmeter if they are used near the installation site . Observe the following precautions when using them;

• Do not use a radio transmitter while the cover of flowmeter converter is open.

» Do not use a transceiver whose output power is more than 5 W.

• Move the antenna of a radio transmitter at least 50 cm away from the ilowtneter and signal cables when using it,

• Do not use a radio transmitter near the flowmeter while it is operating online. The transmitter’s output impulse noise may interfere with the flowinder.

• Do not install a radio transmitter antenna near the flowmeter converter and signal cables,

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(10) For reasons of flowmeter failure, inappropriate parameters, unsuitable cable con

nections or poor jnstallaiion conditions, the flowmeter may not operate properly. To prevent any of these problems causing a system failure, it is recommended that you have preventive measures designed and installed on the flowmeter sigttal re* ceiving side.

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TOSHIBA

TabJe of Contents

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SAFETY PRECAUTIONS

Hiliidling Precautions .....................................

1, Product Inspection and Storage ''

1.1 Product Inspection L2 Storage

...............................................

...........................

2* Overview .....................................................

3- Names of Parts

4, Installation

4.1 Location

..............................................

...................................

...........................................

4.2 Mounting Procedure..........................

4.3 Piping Connections

5h Wiring

...........................................

..........................

5.1 Cables ...............................................

5.2 External Device Connections and Grounding

5.3 Digital I/O Connections

5.4 Wiring Procedure

6. Operation ■ •

........

........................................

...................

.............................

6.1 Preparatory Check ............................

G.2 Zero Adjustment

7* LCD Display and Controls

...............................

.....................

7.1 Outline ..............................................

7.2 Display Formal .................................

7.3 Basic Operations

..............................

7.4 Configuration Items Scleclion Tabic

7.5 Password Input

8. Configuration Parameter Setting

.................................

8.1 Configuration items .........................................

8.2 Checking or Changing Parameters

9* Calibration ..................................................

..................

’ 2

■ ■ 5 . . . 9

. 9

- 10

■ ■ II

■ 14 15

' 16

■ ■ 18

■ ‘ 23

■ ■ 25 25

■ ■ 27

■ ‘ 28 30

- 30

■ 31

■ ‘ 32

■ ■ 32 34

■ ' 42 43

' 44

- 44 ‘ 44

101

9.1 Calibration Items .............................................

9.2 Calibration Using Converter Signal Source

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101 102

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10. Digital I/O Functions

10.1 Digital I/O SpecificaiiOQS

.........................................

...................................

10.2 Totalizer and Pulse Output ....................................

10.3 Multi-range Functions ...........................................

1G.4 High and Low Limit Alarms

10.5 Empty Pipe Alarm 10k6 Preset Point Output

..............................................

10 J Remote Zero Adjustment

................................

......................................

10.8 Remote Selection of FiTfccl Value Output

10.9 Converter Failure Alarms

IL Communkatinns Function

.....................................

11.1 Communications with llic AFIOO Terminal

11.2 Communications Procedure

1L3 Cautionary Notes on Communications ..................

12, Self-Diagnostics and Alarms .................................

12.1 Self-Diagnostics ....................................... ............

12.2 Output Status for Errors and Alarms

13, Maintenance and Troubleshooting

13H Maintenance

13.2 Troubleshooting

14, Principle of Operation ......................................

.......................

....................................................

......................

...................................

....................

15, Specifications ..................................................................

15.1 Flowmeter Specifications ■ ■ —

..........................

15.2 Type Specification Code .......................................

16, Outline Dimensions .

Appendix 1 . Electromagnetic Compatibility and Low Voltage

Electromagnetic Compatibility

......................................................

................................................

Low Voltage Safety.......................................................* - . . -

Safety

106

107 108 113

118

120

121

125 126 127 128 J28 129 130

131 131 134 135 136 139

142

143 143 148 151

152 152 153

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TOSHIBA

Ь Product Inspection and Storage

upon iirrival of the produt;i packiigc» open Ihc package and check the items contained inside.

If you do not intend ю install the product soon after opening the package, store Ihc product

and other related items in a place such as described in 1,2 below,

LI Product Inspection

The LF494/LF404 electromagnetic flowmeter is shipped in a cardboard container filled with

shock-absorbing materials. Open the package carefully and check as follows:

■ Make sure the following items arc included in the package.

(1) Model LF494/LK404 Electromagnetic Flowmeter*...,* i

(2) Instruction Manual

■ Inspect the flowmeter for indications of damage that may have occurred during shipment.

■ Make sure the type and specifications of the flowmeter are in accordance with (he ordered spccillcations.

If you cannot find the items listed above or any problem exists, contact your nearest

Toshiba representative.

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..................................................... |

1.2 Storage

To store the I.r494/LF404 flowmeter after opening the package, select a storing place as follows and keep it under the conditions described below:

(1) Avoid places where there is direct sunlight, rain or wind. (2) Store the product in a weli-vemilaicd place. Avoid places of extremely high

humidity or extremely higher low temperature. The following environment is recommended:

* Humidity range: 10 to 90% RH (no condensation)

• LStoruge temperature: -15 to +65* C

(3) Avoid places where vibratioiis or mechanical shock occur. (4) Uo not leave the converter housing cover open . Open the cover only w'hen

you actually start wiring cables. I.eaving the cover open can cause gradual

deterioration of circuit isolation.

(i) To put the flowmieter temporarily on the floor, place it carefully wi\U something

to support ii so that the flowmeter will not topple over

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TOSHIBA

2, Overview

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The LP494/LF404 ciectromagiiclic flowmeter can be use in the following hai;ardous (clas sified) locations,

(1) FM Approval

Class I , Division 2» Groups B, C and D, Class n , Division 2, Groups K and G Class IIE

(2) CSA Certification

Gass I , Division 2, Groups B, C and D, Class U, Division 2, Groups E, F and G Class in

The device measures the volumetric flow rates of electrically conductive materiaU on

the basis of Faraday's J.aw of electromagnetic induction.

The device consists of two unit.s; the detector» through which the fluid to be measured

flows, and the converter, which receives the electromorive force signals from the delector, then converts the signals into the 4—20 mA dc signal.

Model LF494/LF404 is a sanitary elcctromagneiic flowmeter designed for applications handling food and beverages. Sani'.ary flowmeters must be sinictured in such a way dial operation and handling is simple, easy and thorough for the purpose of sanitary control such as cleaning, sterilizing and drying, llic flow-meter has no obstacles in the flow

stream and it is designed to provide indispensable conditions for sanitary control and is

fit for flowrate measurcjncnt for food and beverages.

Features

Model LF494/LF404 sanitary flowmeter has Ihe following features: (J) Fluid flow is not obstructed and pressure loss is negligible.

Toshiba's original noisc-suppression circuit with signal processing capabilities ensures

(2)

a stable oulpul. Has no moving parts and flow indication is quick with high accuracy even under low'

(3)

flowrate measurement conditions. Equipped with a ferrule, compatible with ISO clamp connection, at both ends of the

(4)

detector. They can be mounted or dismounted easily and securely. No obstacles in the flow stream and nowhere remains the fluid along the detector pipe.

(5)

Thus deterioration or corrosion of fluid does not <xxmr.

High accuracy, ±0,5% of rale is possible for 0.3-10 m's velocity range.

(fi)

0,1 lo 0.3 m^s range is available oplionaljy.

The flowmeter has various flow measurement output and control functions as standard

(7)

specifications and the optional LCD display for convenient parameter settings.

• 'I’hcse functions can be selected with control keys on the panel.

Intelligent functions

(S)

* The widely used HART protocol comm uri real ions system is used as a standard

feature, HART (Highw'ay Addressable Remote Transducer) is a communications protocol for industrial sensors recommended by HCF (HART Communication Foundaiion).

.An easy-io-rcad LCD display (2-line x 16-character display) (optional)

(У)

• The backlit LCD display can be read even under poor lighting conditions.

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TOSHIBA

3. Names of Parts

The oulline drawing of the LF4y4/LF404 flowmeter is shown in Figure 3.1 and (lie in*

_____________

IMPORTANT

The apparatus should not be provided with the cable glands^

Please prepare yourself for the cable glands which could be used in Division2 hazardous locations.

icrnal views of tJie I.F404 converter arc shown in Fifinres 3.2 and 3,3,

____________

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Outline ]>ra>i^ing

Converter

LF494/LF404 withaiit LCDdispliiy(standarcl)

Convcrlcr

LF494/I J*'404with IXD display (optiimal)

Figure 3,1 OutliDe drawing of LF494/LF404 Flowmeter

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TOSHIBA

Tennina] Board of O^'404 Converter

6F8A07.74

Power supply LcrmijjLils

Digital output (DOl) D02)

tcrminalu

Internal grounding terminal

External groondini*

^ terminal

Digital input (Ur) terminal

Common for Dl, DOl and 1X)2

Figure 3*2 Teminnl Bt>ard of LF404 Converter

Current output terminal

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TOSHIBA

Contrri switch or kej's of LF404 Converter

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LF404 without LCD Dtsplay

Figure 3J Control switch or keys of LF404 Converter

TOSHIBA

4. Installntion

Safety Precautions For Installation

Do not live ciremts under envTonmcni of explosive atmospheres.

6F8A0 7 7.4

A WARNING

(S)

DONT

M Do not use parts of other products.

DOMT

f Do not live circuits While assembly of all components is not over.

DONT

I Install per the National Electrical Code for the US (NEC, ANSI/NFPA 70)

and the Canadian Electrical code for Canada (CEC, CAN/CSA-C22J)«

Live part of electric circuit or a high temperature department can

cause explosion.

Protective performance degradation for hazardous location can cause explosion.

Unsuitable conduit connections for hazardous iocation can cause explosion.

A CAUTION

■ install a switch and fuse to isolate the LF494/L.F404 from main power.

Power supply from main power can cause electric shuck or circuit

QQ breakdown.

■ Use an appropriate device to carry and install the LF494/LF404.

If his product falls to the grou nd, i nj u ry, or malfiincrioji of or damage (o

[jQ the product, can he caused.

■ Do m>t modify or disassemble the LF494/LF404 unnecessarily,

Modifying or disassembling this product

vHy cause electric shock

m a If un ction or d am age to

DON’T product

■ Do not work on piping and wiring

with wet hands.

Wet hands may result in

electric shock

DONT

■ Ground the LF494/LF4(M Independently from power equipment.

Operating this product without grounding can cause electric

Q0 shock or malfunction.

The label shown left is placed near the terminal hoard for power input,

/ J \ (A black border and symbol on

yellow triangle)

Re alcri to electric shock.

TOSHIBA

4A Location

6F8A0774

To Kcicct the inslaUatioii site, follow the prccaations described below:

■ Avoid places where fluid runs in a pulsating torm,

■ Avoid plaees wiihjji the immediate proximiiy of equipment producing electrical interference (such as motors, transformers, radio transmitters, electrolytic cells, or

oiher equipment causing electromagnetic or electrostatic interference),

■ Avoid places where excessive pipe vibration occurs,

■ Avoid places where there is direct sunlight. If this is unavoidable, use an appropriate shade

■ Avoid places w'here corrosive atmospheres or Jiigh humidity conditions obtain,

■ Avoid places of loo great an elevation or constricted areas where clearance for installation or maintenance work is not provided,

■ Design piping so that the detector pipe is always filled with fluid, whether the fluid is flowing or not,

■ The LF494 detector has no adjustable piping mechanism, Insiall an adjustable short

pipe where needed.

■ Chemical injections should be conducted on the dow-nstream side of the flowmeter

TOSHIBA

4.2 Mounting Procedure

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A CAUTION

■ Use an appropriate device to eatry

and inistall the LF494/LF404. working on pipes.

If his product falls lo the

A B ground, injury, of power is applied can

malfunciioit of or damage

DO to the product, can be

caused.

4.2.1 Pipe checks

Before insiaJling pipes, check for iiny leaning ns illustrated in Figure 4.1. An attempt to unreasonably connecting pipes that arc inclined may lead to a detector breakdown or tlnid leakage. Connecting pipes in an eccentric state may also cause local wears and leans of linings, as well as measurement errors.

Before installing pipes, make sure lo flash the iiiierior of the pipes to remove deposited

matters.

■ Turnoff mains power before

Working on pipes while

V_y cause electric shock.

DON’T

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TOSHIBA

4,2,2 Installation Procedure

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The LF4y4/LF404 adopis the ISO ^^^52 ditmp connection mcihcnJTo mount the 1.F494/LF404, see Figure 4.2 and follow the procedure below;

1. Weld a ferrule of the detector to the proces.s pipe on both upstream and downstream sides.

2. Install the LJ’494/LI-404 between the two tcrrulcs w'hicli were welded to the pnjcess

pipes above.

3. InstaU a gasket betw^een ;he grooves of theferruJeon the detector side and lhal of the

ferrule on the process pipe for both upstream and dow^nslream sides, 1 iicn place a

clamp over the joined ferrules as shown in I’igure 4,2 and tigliien with the screw' for both upstream and downstream process pipes.

IMPORTANT

When high-temperature fluid is being nieasuredj radiant heal from ihe detector pipe surface and adjoining pipes may cause the ambient temperature of the converter to go above 60 °C. If the ambient tempera lure goes above 60^ C, (ry to lower the temperature by measures such as wrap ping hcal-insulating materials over the detector pipe and adjoining pipes.

_______________________________

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TOSHIBA

4J Piping Connections

(1) Required Pipe Length

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If various jaintsS ¡irc used upiitream of the cleiector oullot, the straight pipe length us

shown in Table 4J is required.

Table 4.1 Required straight pipe length on the upstream side

L: Required straight pipe ietiglh—straight pipe length plus half length of the detector. D: Nominal bore size (diameter)

NOTES

1. The length of a reducer* if connected, can be counted as a part of the straight pipe length.

2. No straight pipe letiglh is needed on the downstream side, if a butterfly valve is installed downstream of the detector, do not let the valve plate protrude into the

pipe of the detector

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TOSHtBA

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C2) PipÊ Orientation

The detector may be installed in horizontal, vertical or sloping pipe runs as shown in

Figure 4,3, However, cxccpl for horizontal installation, llmd should flow from lower to upper directions. See Figure 4.3.

Fldw direction

I^Cb)

(a) Horizontal pipe instailation (h) Vertical pipe installation (c) Sloping pipe insialiation

Ground sgriace

Figure 43 Detector Piping Orientation

The electrodes should be positioned horizontally against the ground surface in any piping installation. See Figure 4.4.

(Jmss-scdiiin A - A

Figure 4.4 Installation position of the detector

Ground surface

TOSHIBA

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(3) Flow Direction

Install the delector in accordance with the flow direction arrow on the detector. See I’ignre 4,5. If the actual flow runs opposite to the specified flow direction, the following display and output appears.. (For bidirectional multi-range measurement, sec 103^ “Mulli-rangc Functions/’).

* LCD display (optional)« Instantaneous How rate—indicates negative values»

Totalized flow—no a>unts added,

* Output:Current output—4.0 mA output; Pulse output—No pulses

For bidirectional range measuremenu the flow in opposite direction results in a positive

output value. See 10.3» “Multi-range Functions/’

(4) Preventing sin Empty Pipe Condition

Design an upright pipe run (Figure 4.6) or sufficicjit head pressure (Fig, 4.7) at the downstream detector oullet if there is a possibility of the detector pipe becoming emptied.

Upright pipe run

Figure 4«6 Detector with 3n upright pipe run at dow'ustream outlet

Detector

Figure 4.7 Detector with sufficient head pressure at downstream outlet

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TOSHIBA

6.F8A0774

(5) Supporting Pipe

Fix Ihc relevant pipes installed on both sides of the detector by attach fittings, etc. to support

the pipe. Y iy supporting the pipes, not only the pipe vibration is reduced but also the damage to the pipes by the electromagnetic flowmeter's weight and the fluid mass. And it protect from fluid leakage at flange face (see Figures 4.^ and 4.9).

Figure 4,8 Example of Pipe Fixing Procedure

Figure 4,9 Model Diagram of L'nsupported Pipes

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TOSHIBA

6F8A07.74

(6)Groiindirif<

The grounding terminal of the LF494/LK404 Qo’ameter should be grounded with lOUohm or less ground resistance. Use a heavy copper braid or wire (cross-sectional area 5,5 nun" minimum) to ground the lerminal and make it as short as possible. The terminal is M4 siiic and an M4-siiie crimped ring fug should be used to connect the wire to the terminal. Avoid a

common ground where earth currcni may fliw. An independent ground is preferable, See

Figure 4.1(1.

To prevent a iwo-poini grounding, ground the shielded cable on the receiving instrument side,

Figure 4.10 Grounding Procedure

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5, Wiring

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Ж WARNING

DO NOT DISCONNECT WHILE CIRCLIT LS LIVE UNLESS LOCATION IS KNOWN TO BE NONHAZARDOUS*

(S)

DON’T

Do not live circuits While assembly of all components is not over.

DON’T

I Install p«r the National Electrical Code for the US (NEC, ANSl/NFPA 70)

and the Canadian Electrical code for Canada (CEC, CAN/CSA-C22J)*

Live part of electric circuit or ^ high temperature department cun

cause explosion.

Protective performance degradation for ha2ardou,s location can

cause explosion.

Unsuitable conduit connections for hazardous location ctm cause explosion.

Ж CAUTION

■ Do not work on piping and wiring with wet hands.

Wei hands can cause system failure,

DON’T

■ Do nut modify or disassemble the LF494/LF404 unnecessarily.

Modifying or disassembling

1 jj^ this product can cause elcc-

trie shock, malfunction of or

DON’T damage to this produci.

■ Use the proper cables for wiring of power and I/O .

Using a cable other :han the

уЛ one specified may c^usc sys-

/ J \ tern failure or damage and

may break watcrproul.

Ш Ground the IvF494/LF404 properly*

Operating this product without a grounding can cau^e system

malfunction.

■ Prepare yourself for the cable glands which could be used in Division 2 hazardous Incation.s*

The apparatus should not be

provided with the cable glands.

* The label shown left is placed

Л\ near the terminal board for

/ power input.

" * Be alert to electric shock.

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TOSHIBA

6F8A0774

I'lowmeter acuumcy may be affccieJ by the way wiring is executed. Proceed with wiring taking ihc foJIowiJig prccauiions:

(1) Select the cable runs away from electrical equipment (motors, transformers, or

nidio transmitters) which causes electromagnetic or electrostatic interference.

(2) Deteriorarion of fJowmetcr circuit insulation occurs if the converter interior or

cable ends gel w^et or humidified. 'I’his in turn causes malfunction of flowmeter or noise problems, Avoid a rainy day if the flowmeter is to be installed outdoors, l-ven indoors, prevent w^ater from splashing over the flowmeter. Try to finish the W'iring as quickly as possibJe

(3) The converter has a surge-ai>sorbing barrier installed inside. Therefore, do not

conduct a wdthsiand voltage test for Ihe converter. To check ihe insulation of the converter, use a voltage of 250 V dc or le.ss.

TOSHIBA

5.1 Cables

Use the kind of cables shown in Table 5.1 to vsdre the converter.

Nnme

Power cable

I/O cable The number of wires for the output cable depends on the

Notei Use a four-wire cable if the arresters are to be used. See Figure 5.1 below.

5*2 EtKlernal Device Connections and Grounding

The terminal board comieciion;s of ihe 1T494/LF404 flowmeter are shown in Figure 5.1.

Proceed with wiring as described in Section 5.4, “Wiring Procedure."’

Cable type

Three-wire sheathed cable (Note)

system specifications. Use a shielded cable with nominaJ cross-sectional area of 1.25 mm^ and overall diameter of 11 to 15 mm.

Table 5*1 Cables

Nominal

cross-sectional area

2 mm^

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Overall diameter

11 to 15 mm

If power supply is specified as DC, use LI ds positive (+) and L2 as negative (-) terminals.

Instrument Panel:

ordered separately

Currentoulput (4-20mAde)

Flowmeter

(■*■) Hs)

I LI I l^|FGt|l3tc|[cq*4 rn|noa|DQl| " f ^ I

______

..................

_____________________

I - ground resistant’^

! ***^ Grounded with 1 OOtior less

. V L>jgita] Output 1 : > ragiu^ O^rtput 2 ‘ > Digital Input (20 lo 30 V dc)

1 -

IV wire 5,5mnr or more

I/O cable

■7:^

W >wcr cable

^ '

' \

Power Switch

*1 To use the arresters, ground the GNI) terminal using the wire shown in broken line.

*2 Locale an cxiernal double-pole power switch on the powder line near the flow'meicr and within easy

operation. Mark one the switch as the disconnecting device for the flowmeter,

Use an appropriate swiicli of the rating shown below:

Recommended sw'ilch rating; Rating 250 V ac, fiA or more

Inrush current 15 A or more

— > pQWCï Supply

Figure 5*1 Terminal Block Connections

TOSHIBA

6F8A07 74

IMPORTANT

(1) The grounding terminal of the LF494/UH04 flo^mEtcr should be grounded with

100 ohm or less ground resiiilance. Use a heavy copper braid or wire

(cross-seciioniil area 5 .5 mn:" minimum) to ground the terminal and make it as short as possible. The icnninal is M4 size and an M4-sizc crimped ring lug should be used lo connect the wire to the tenninaU Avoid a common ground where earth current may flow . An independent ground is preferable^ See Figure

conductive pipeline grounding and noii-conducrive pipeline grounding procedures.

(2) To prevent a wo-poinl grounding, ground the shielded cable on the receiving

inshiimenl side.

5.2 . for a

I If connection pipe is conductive:

Connect between the grounding terminal and both ends of the mating flanges with a heavy copper braid or wire (cross-section 5.5 min‘ minimum).

If connection pipe is non-conductive:

Use a heavy copper braid or wire (cross-scciiiin 5.5 mm^ minimum) to ground he terminal with UK) ohm or less ground resistance*

Figure 5.2 Grounding Procedure

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TOSHIBA

53 Digital I/O Connections

Digital I/O icrmmEils cottsiM ol conlact oulpul lerniiiials (jilatidard DOl Eind optional

D02), voJlage signal input terminal (Dl, opcioiial), and signal common terminal {COM). Hach terminal (DOl, D02 and DI) is isolated from internal circuits. Terminal (COM) is the signal common for the other three terminals {DOl, DOl and DI). Functions can be assigned for each xnninal with Ihe LCD control keys (option). See Chapter 10, ‘‘Digital I/O Functions/ To connect an electromagnetic relay ot counter lo the contact output tcrrtiinal (DOl or 1>02)^ put a surge-absorbing diode into the input circuil of the relay or counter. See Figure 5.3 for an example of electromagnetic counter connection,

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Note I: Use a surge-absorbing diode of the rating: current rating lAand voltage rating

200 V minimum.

Note 2: The Solidstaie relay, photo-coupler and resistor are not provided for the standard

model (the one whth no digital I/O specifications). l.eavc the terminals for D02 and

Dl open.

Figure 5.3 Electromagnetic Counter Connection Exntnple

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TOSHIBA

S.4 Wiring Procedure

5A1 Cable Terminationi

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Cable termination and cable connections are described below.

A CAUTION

■ Ho not con d net w i ri n g work wt e n ■ Eto not w'ork on piping and wiring power is applied.

Wiring while power is ap-

1 plied can cause clccinc 1 electric shock.

shock.

DONT DONT

IMPORTANT

Ttic apparatus should not be provided with the cable glands. Please prepare yourself for the cable glands which could be used in Division2 hazardous locations.

with wet hands.

Wet hands may result in

Use cables as specified in Table 5.1 ^ First, Remove the cable sheath about 70 mm from the end to expose the coated wires and then strip the wires about 10 [nm. Then attach an M4-sis:e compression terminal lug to the end of each wire using a compression tool. The compression terminal should be of Ihe kind with insulated sleeve to prevent shorts between adjacent terminals. The overall length oi thc wire with the terminal attached should be about

6(.) nmi. Sec Figure .‘5,4 below,

M4-sizc compression terminal lug

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TOSHIBA

5A2 Cable Connections

6F8A0774

Connect the term incited cable wires to the terminal board as described below.

IMPORTANT

Connect the wires securely to :hc terminal board. A loose connection may result in unsaiisfacLory flowmeter performance. Make sure the wires arc securely connected.

(J) Remove the housing cover for the terminal board shown in Figure 3.1. The terminal board

is located inside the converter as shown in Figure 3,2. Connect the crimped terminal of each wire to the specified pin of the terminal board . See Figure 5.1 for the terminal board configuration, Tighten each crimped terminal to the terminal board wiih a screw using a l*hil!ips screwdriver as shown in Figure 5.6. Loose connection may result in unsatisfactory flowmeter performance. Make sure the wire is securely connected.

NOTE

ITic appropriate torque for tightening the terminal board screws is J .2 Ntn (12 kgf- cm).

(2) After the terminal block connecriorij pull the cable a little so that the cable runs straight

from (he terminal block without unnecessary winding.

(3) Attach the terminal cover and screw the housing cover for the terminal block. To keep the

housing seal, lighten securely the cover using a tool fitting with the groove on the cover

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