Toshiba LF620 User manual

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Electromagnetic Flowmeter Converter
LF620 Type, LF622 Type
INSTRUCTION MANUAL
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.
•After reading this manual, store it with care in a place where it can be referred to
whenever needed.
•Please be sure that this manual is delivered to the personnel who will use this
product.

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NOTICE
We thank you very much for your purchase of our LF62*series electromagnetic flowmeter
converter.
Integral type converter LF620
Separate type converter LF622
This instruction manual describes the notes on using an electromagnetic flowmeter
converter, installation, configuration and maintenance. It is intended for the personnel in
charge of installation, operation and maintenance.
To use this product properly and safely, read this manual carefully before using this product.
After reading this manual, store it in a place where it can be referred to
whenever needed.
About a PROFIBUS or Modbus communication function, please read each instruction
manual.
This manual uses the following markers to identify the integral type or separate type when it
describes items specific to the integrated type or separate type. Items without this marker are
common items to the integral type and separate type.
Integral type converter LF620:
Separate type converter LF622:
Toshiba LF62*series electromagnetic flowmeter converters can be used in combination with
various types of electromagnetic flowmeter detectors.
For the notes on usage, piping, installation, configuration and maintenance of the
combined detector, check the model number of the combined detector and read the
instruction manual of the relevant detector.
About Safety Precautions
Read the Safety Precautions described at the front carefully and understand the contents
before using this product.
The “Safely symbols” used in the “Safety Precautions” are shown in a location such as
in the margin to the left of the corresponding commentary in the main text.
NOTES
1. 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. The 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 the regulations in force in the country in which this product is to be
used.
First Edition July, 2009
LF620
LF622

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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.
Make yourself familiar with signal words and symbols used for safety signs and labels. 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 are used to designate a degree or level of hazard seriousness.
The signal words used for the product described in this manual are WARNING and CAUTION.
WARNING
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided,
may result in minor to moderate injuries or in property
damage.
Notes:
1 “Serious injury” refers to an injury such as loss of sight, physical damage, burns (high
temperature or low temperature) electric shock, bone fracture and poisoning and the after
effect of the injury remains or the injury requires hospitalization or long periods of
outpatient treatment.
2 “Minor to moderate injuries” refers to burns, electric shocks, and so on, that do not require
the injured person to be hospitalized or go to a hospital for a long period of time for
medical treatment. “Property damage” includes all kinds of damage to property, equipment
or materials.
Safety symbols
The 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 the circle
Indicates an action that is mandatory. DO this action.
The 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.
Color explanation
WARNING Background color: Yellow and Red, Border: Black, Picture display: Black
CAUTION Background color: Yellow, Border: Black, Picture display: Black

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SAFETY PRECAUTIONS (continued)
Safety Precautions for Installation and Wiring
CAUTION
Do not use the LF620 and LF622 in an
explosive atmosphere.
Use an appropriate device to carry and install the
LF620 and LF622.
DON’T
Using this product in an
explosive atmosphere can
cause explosion.
DO
If this product falls to the ground,
injury, or malfunction of or damage to
the product, can be caused.
Install a switch and fuse to isolate the LF620
and LF622 from mains power.
Do not modify or disassemble the LF620 and
LF622 unnecessarily.
DO
Power supply from mains
power can cause electric
shock or circuit
break-down.
DON’T
Modifying or disassembling this
product can cause
electric shock,
malfunction of or damage to this
product.
Turn off mains power before conducting
wiring work.
Ground the LF620 and LF622 independently from
power equipment. (100 ohm or less ground
resistance)
DO
Wiring while power is
applied can cause electric
shock.
DO
Operating this product
without grounding can cause
electric shock or malfunction.
Turn off mains power before working on
pipes.
■Use crimped terminal lugs for the terminal board
and GND terminal.
DO
Working on pipes while
power is applied can cause
electric shock.
DO
Loose connections can cause
electric shock, fire from excessive
current or system malfunction.
Do not conduct wiring work with bare hands. Do not work on piping and wiring with wet hands.
DON’T
Remaining electric
charge even if power is
turned off can still cause
electric shock.
DON’T
Wet hands may result in electric
shock.
The label shown left is placed near the terminal board for power supply
on the converter.
Be alert to electric shock.

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SAFETY PRECAUTIONS (continued)
Safety Precautions for Maintenance and Inspection
CAUTION
Do not touch the LF620 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.
DON’T
Wiring while power is applied can
cause electric shock.
Do not conduct wiring work with wet
hands.
DON’T
Wet hands may result in
electric shock.
The label shown left is placed near
the terminal board for power input.
(A black border and symbol on
yellow triangle)
Be alert to electric shock.
Do not use a fuse other than the one
specified.
DON’T
Using a fuse other than the
one specified can cause
system failure, damage or
malfunction.
Use a rated fuse as follows:
Fuse rating:
• 1A/250V for 100 to 240Vac or 110Vdc
• 2A/250V for 24 V dc
Dimensions:
Diameter 5.2 mm × 20 mm
Melting time characteristic:
• Time Lag Fuses for 100 to 240Vac or 110Vdc
• Normal blow type for 24 V dc
Usage limitation
(1) This product is not manufactured for applying to a system requiring safety directly involved
human life as follows. Please contact your nearest Toshiba reprehensive if there is a possibility of
using this product for such use.
- Main control systems of nuclear power plants, safety protection systems in nuclear
facilities or other important systems requiring safety
- Medical control systems relating to life support
(2) This product is not approved for explosion-proof applications. Please do not use this product in
an explosive atmosphere (explosion protection area).
Warranty and Limitation of Liability
Toshiba does not accept liability for any damage or loss, material or personal, caused as a direct or indirect
result of the operation of this product in connection with, or due to, the occurrence of any event of force
majeure (including fire or earthquake) or the misuse of this product, whether
intentional or accidental.

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Handling Precautions
To obtain the optimum performance from the LF620 and LF622 converter for years of continuous
operation, observe the following precautions.
(1) Do not store or install the flowmeter in :
・Where there is direct sunlight.
・Where excessive vibration or mechanical shock occurs.
・Where high temperature or high humidity conditions obtain.
・Where corrosive atmospheres exist.
・That can be places submerged under water.
・Where there is a sloped floor. To put the flowmeter temporarily on the floor, place it carefully
with something, such as a block, to support it so that the flowmeter will not topple over.
・Places where there is following factors.
■Factors to impede infrared switch to operate properly
・Intense light such as direct sunlight and reflected sunlight by window glass or metal plate
・Place where brightness changes suddenly such as ON/OFF of lighting
・Dense smoke or steam near the control panel
・Those attached on the control panel such as rain (dew drop), snow, ice, mud and oil, and
haze due to their attachment
・Light reflecting object near the control panel, or reflecting object such as metal plate placed
opposing to the control panel
When any of above factors is considered, take a measure for the proper operation of infrared
switch such as to place a cover or to secure a space for at least a person to stand in front of the
control panel.
When unable to avoid above factors, operate the EMF converter removing the factor by
covering the control panel by hand so that light does not shine on it, by cleaning those attached
on the control panel, or by standing in-between the reflecting object and the control panel to
block the light.
(2) Wire cables correctly and securely.
Be sure to ground at the combined converter side (grounding resistance 100Ωor less). Avoid a
common ground used with other equipment where earth current may flow. An independent
ground is preferable
(3) Select cable paths away from electrical equipment (motors, transformers, or radio transmitters),
which causes electromagnetic or electrostatic interference.
(4) The cable lead-in section must be tightened securely to keep air tightness.
(5) If the inside of the converter or cable terminals are wetted or humidified, it may cause insulation
deterioration, which can result in fault or noise occurrence. So do not conduct wiring in the
open air on rainy days.
Also, be careful not to wet down the converter even in the case of indoor wiring, and complete
wiring work in a short period of time.

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Handling Precautions (continued)
(6) The converter housing covers and the cable glands are tightened securely at the time of
shipment. Do not remove these covers or glands unless it is necessary to wire new cables or
replace old ones. Otherwise, gradual deterioration of circuit isolation or damage to this
product can be caused.
(7) Observe the following precautions when you open the converter housing cover:
•Do not open the cover in the open air unprotected against rain or wind. This can cause
electric shock or cause damage to the flowmeter electronics.
•Do not open the cover under high ambient temperature or high humidity
conditions or in corrosive atmospheres. This can cause deterioration of system
accuracy or cause damage to the flowmeter electronics.
(8) Since a varistor is built in converter, do not conduct a withstand voltage test for the
converter.
In addition, the voltage for checking the insulation of the converter must be 250VDC or
lower.
(9) This product may cause interference to radio and television sets if they are used near the
installation site. Use metal conduits etc. for cables to prevent this interference.
(10) 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:
•Close a transmitter cover before using a transceiver.
•Do not use a transceiver whose output power is more than 5 W.
•Move the antenna of a transceiver or a cellular phone at least 50 cm away from the
flowmeter and signal cables when using it.
•Do not use a radio transmitter or a cellular phone near the flowmeter while it is
operating online. The transmitter or cellular phone’s output impulse noise may interfere with
the flowmeter.
•Do not install a radio transmitter antenna near the flowmeter and signal cables.
(11) For reasons of flowmeter failure, inappropriate parameters, unsuitable cable
connections or poor installation 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 signal receiving side.
(12) For piping and installation of the combined detector, check the model number of
detector and read the instruction manual of the relevant detector.
*We assume no responsibility for nonconformity caused by violation of precautions described in
this manual or used in violation of the installation method and the operation method stipulated in
a relevant ordinance or other regulations.

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Table of Contents
1. Product Inspection and Storage...........................................................................................................................10
1.1 Product Inspection......................................................................................................................................... 10
1.2 Storage.......................................................................................................................................................... 10
2. Overview .................................................................................................................................................................11
3. Names of Parts.......................................................................................................................................................12
3.1 Appearance ................................................................................................................................................... 12
3.1.1 Appearance of LF620 Type ............................................................................................................. 12
3.1.2 Appearance of LF622 Type ............................................................................................................. 13
3.2 Construction of the terminal blocks................................................................................................................ 14
3.2.1 Terminal Block Construction of LF620 Type.................................................................................... 14
4. Installation ..............................................................................................................................................................15
4.1 Notes on Selecting the Installation Location.................................................................................................. 16
4.2 How to Install................................................................................................................................................. 17
4.2.1 LF620 Type ..................................................................................................................................... 17
4.2.2 LF622 Type ..................................................................................................................................... 17
5. Wiring......................................................................................................................................................................20
5.1 Cables ........................................................................................................................................................... 21
5.2 External Device Connections and Grounding................................................................................................ 22
5.2.1 LF620 Type ..................................................................................................................................... 22
5.2.2 LF622 Type ..................................................................................................................................... 23
5.3 Notes on Wiring............................................................................................................................................. 24
5.3.1 Notes on Instrumentation-Converter Wiring .................................................................................... 24
5.3.2 Notes on Wiring of the LF622 Type................................................................................................. 24
5.4 Wiring ............................................................................................................................................................ 25
5.4.1 Grounding........................................................................................................................................ 25
5.4.2 Terminal Treatment of Cables ......................................................................................................... 27
5.4.3 Cable Connection............................................................................................................................ 29
5.5 Digital I/O Connections.................................................................................................................................. 31
6. Operation ................................................................................................................................................................32
6.1 Preparatory check ......................................................................................................................................... 32
6.2 Zero Adjustment ............................................................................................................................................ 33
7. LCD Display and Controls.....................................................................................................................................34
7.1 Name and Function of Each Part of LCD Display.......................................................................................... 34
7.2 Display Format .............................................................................................................................................. 37
7.3 Basic operations............................................................................................................................................ 41
7.3.1 Mode Change.................................................................................................................................. 41
7.3.2 Setting and Calibration .................................................................................................................... 45
7.4 Configuration Items Selection Table.............................................................................................................. 49
7.5 Password input.............................................................................................................................................. 51

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8. Parameter Settings.................................................................................................................................................53
8.1 Parameter Setting Items................................................................................................................................ 53
8.2 Check/Change of Parameters ....................................................................................................................... 54
8.2.1 Menu Configuration Selection Screen .............................................................................................54
8.2.2 Exciting Current Value..................................................................................................................... 55
8.2.3 Meter Size ....................................................................................................................................... 56
8.2.4 Exciting Frequency.......................................................................................................................... 58
8.2.5 Flow Direction Setting...................................................................................................................... 59
8.2.6 Display Setting ................................................................................................................................ 60
8.2.7 Custom Coefficient Setting.............................................................................................................. 64
8.2.8 Custom Unit Setting......................................................................................................................... 65
8.2.9 Span (Range) .................................................................................................................................. 66
8.2.10 Damping Constant........................................................................................................................... 72
8.2.11 Rate-Of-Change Limit and Control Limit Time................................................................................. 73
8.2.12 Low Cutoff ....................................................................................................................................... 75
8.2.13 Display Low Cutoff........................................................................................................................... 76
8.2.14 Still Water Zero Adjustment............................................................................................................. 77
8.2.15 Manual Zero Adjustment ................................................................................................................. 78
8.2.16 4−20mA Alarm Output Setting ........................................................................................................ 79
8.2.17 Output Low Limit Setting ................................................................................................................. 80
8.2.18 Digital Output................................................................................................................................... 81
8.2.19 Digital Input ..................................................................................................................................... 83
8.2.20 Count Rate (Pulse Rate), Pulse Width Setting Mode and Pulse Width ........................................... 85
8.2.21 Preset Count ................................................................................................................................... 88
8.2.22 Preset Mode.................................................................................................................................... 90
8.2.23 Flow Rate High/Low Alarm and High-High/Low-Low Alarm............................................................. 91
8.2.24 Empty Pipe Alarm Setting................................................................................................................ 93
8.2.25 Self Diagnosis ON/OFF Setting....................................................................................................... 94
8.2.26 Converter Alarm .............................................................................................................................. 95
8.2.27 Fixed Value Output.......................................................................................................................... 96
8.2.28 Password Setting............................................................................................................................. 99
8.2.29 LCD Adjustment ............................................................................................................................ 101
8.2.30 Switch Position Setting.................................................................................................................. 102
8.2.31 Communication Setting ................................................................................................................. 103
8.3 Parameter initial settings list........................................................................................................................ 104
9. Calibration.............................................................................................................................................................106
9.1 Calibration Items.......................................................................................................................................... 106
9.2 Converter Check / Calibration...................................................................................................................... 107
9.2.1 0 % Flow Rate Calibration (Zero Calibration) ................................................................................ 107
9.2.2 50 % Flow Rate Calibration ........................................................................................................... 108
9.2.3 100 % Flow Rate Calibration (Span Calibration) ........................................................................... 108
9.2.4 Checking the Excitation Current .................................................................................................... 108
10. Functional Description.........................................................................................................................................109
10.1 Digital I/O Specifications.............................................................................................................................. 110
10.2 Totalizer and Pulse Output .......................................................................................................................... 111
10.3 Multi-range Function.................................................................................................................................... 115
10.4 Flow Rate High/Low, High-High/Low-Low Alarm Output ............................................................................. 120
10.5 Preset Count Function................................................................................................................................. 122
10.6 Remote Zero Adjustment............................................................................................................................. 127
10.7 Remote Selection of Fixed Value Output..................................................................................................... 127

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10.8 Converter Failure Alarm .............................................................................................................................. 128
10.9 Multiple range high/low limit alarm function ................................................................................................. 129
10.10 Custom unit function.................................................................................................................................... 131
11. Communications Function..................................................................................................................................134
11.1 Connections with HHT Terminal.................................................................................................................. 134
11.2 Procedure for Communications with HHT ................................................................................................... 135
11.3 Notes on Communications .......................................................................................................................... 136
12. Self Diagnosis and Alarms..................................................................................................................................137
12.1 Self-Diagnosis ............................................................................................................................................. 137
12.2 Output Status for Errors and Alarms............................................................................................................ 140
13. Maintenance and Troubleshooting.....................................................................................................................141
13.1 Maintenance................................................................................................................................................ 141
13.2 Troubleshooting........................................................................................................................................... 143
13.2.1 Flow rate is not indicated............................................................................................................... 143
13.2.2 Flow rate indication is not correct. ................................................................................................. 144
13.2.3 Flow rate indication is not stable.................................................................................................... 145
13.2.4 When switch operation is unable................................................................................................... 146
14. Principle of Operation..........................................................................................................................................147
15. Specifications.......................................................................................................................................................148
15.1 Specifications .............................................................................................................................................. 148
15.2 Model Number Table................................................................................................................................... 153
16. Outline Drawing....................................................................................................................................................154
16.1 LF620 Type ................................................................................................................................................. 154
16.2 LF622 Type ................................................................................................................................................. 155
Appendix........................................................................................................................................................................156