YOKOGAWA AR-RT User's Manual
User’s
Manual
IM AR04-01E
Model AR-RT
Arrester for RTD/Potentiometer
Scott
Please read through this Manual before using the arresters for correct
handling.
Please keep this Manual carefully after use.
2nd Edition Sep. 2001 (MC)
1.
Cautionary Notes for Safe Use of the Product
IM AR04-01E
For the correct use of this product,read through this manual before
use.The following safety symbol is indicated on the product to ensure
safe use.
If this symbol is indicated on the product, the operator
should refer to the explanation given in the instruction
manual in order to avoid personnel injury or death to either
themselves or other personnel, and/or damage to the instrument. The manual describes the special care the operator should exercise to avoid shock or other dangers that
may result in injury or loss of life. The following symbol
marks are used only in this manual.
Musashino Center Bldg.
1-19-18, Naka-cho Musashino-shi, Tokyo 180-0006 Japan
Phone: +81-422-55-8755 Facsimile: +81-422-55-8954
●FRK-16 (Panel)
19
24.5
89
99
73
2.2 External Dimensions
23.5
483
465
36-M4 8-ø5.5⫻10
441.6
55
28.5
26.5
Unit : mm
(8.5) (3.8)
Oval hole
50
24.7
76.2
16.5
IMPORTANT
Indicates that operating the hardware or software in a
particular manner may damage it or result in a system
failure.
NOTE
Draws attention to information that is essential for
understanding the operations and/or features of the
product.
2. Mounting and Wiring
WARNING
Wiring should be done after ensuring the break of each
cable.
2.1 Mounting
Mount the arrester referring the figure below.
24
100
90
Main body
Terminal base
2.3 Terminal Arrangement
A
B
C
Use AR-RT
Protect side
terminal B B
C B
3
Surge side 1 A
1
2
terminal 2 B
3 B
Terminal
A A
AR8
DIN rail adapter
No.
104
Panel
90
M4 screw
2.4 Wiring
IMPORTANT
●
Use of arresters ignoring the specifications may cause
electric shock, overheating or damage.
(a) Input signal value applied to the arrester should
meet the required specifications.
(b) The external wiring to the terminals and wiring to
ground are as specifications.
Flexible twisted wire and durable round crimp-on terminal (JIS C2805)
are recommended to use.
(1) Signal cable
Nominal cross-sectional area of conductor: 0.5 to 0.75 mm2.
Example of suitable cable:
Vinyl code (VJF) (JIS C3306) for electronic instrument.
(2) Grounding cables
Nominal cross-sectional area of conductor:
2.0 mm2 or more for grounding.
Example of suitable cable:
600V vinyl insulated cable (IV) (JIS C3307),
Vinyl insulated cable (KIV) (JIS C3316) for electronic instrument
2.5 Grounding
Interconnect the ground terminals of the arrester and the instrument to
be protected. Touch ground from the arreter side as shown in the figure
below. Install the arrester and instrument as close as possible, and
make the cable as short as possible. The wires for interconnect grounding should have lower effective resistance than ground resistance.
Ground resistance should be 100 Ω or less. (JIS Class 3 grounding)
NOTE
Wire tightening torque for arrester should not be 1.2 N•m or
more.
(1) Interconnect Grounding
Arrester
Instrument
(2) Interconnect Grounding
(when using shield line)
Arrester
Instrument
4. Environmental Conditions
Ambient temperature: 0 to 50°C
Relative humidity: 5 to 90%RH (No condensation)
Altitude at installation site: Max.2000m above sea level
Installation category based on EN61010-1: II (see Note.)
NOTE
The “Installation Category” implies the regulation for
impulse withstand voltage.It is also called the “Overvoltage
category”.“ II ” applies to electrical equipment.“Pollution
level” describes the degree to which a solid,liquid or gas
which deteriorates dielectric strength is adhering.“2”
applies to a normal indoor atmosphere.
5. Maintenance
5.1 Arrester main body replacement
The arrester main body and terminal base are connected by plug-in.
Circuit between surge side and protect side would not be open even if
the main body is removed from the socket on terminal base by loosing
mounting screw. So the arrester main body can easily be replaced with
new one.
NOTE
●
When replacing the arrester main body, make sure that
the model and suffix codes indicated on the labels of
the main body and terminal base are the same.
●
When replacing the arrester main body having
specifications of surge discharge withstand current
rating of 5000A, make sure that the style code indicated
on the label of terminal base is “S2.0”. If mounted to the
terminal base of style code “S1.0”, the specifications of
the arrester main body can not be satisfied, because the
surge discharge withstand current rating will be for
1000A specifications. To operate the arrester for 5000A
specifications, the replacement of terminal base is also
required.
5.2 Arrester checking
To check the arrester performance, remove main body from the socket
and check it by using the checker (option). Replace the main body if required.
Grounding for serial installation of arresters is to
connect ground terminal board in zigzag and
touch ground at one point from last arrester
according to JIS Class 3 grounding.
Grounding wire should be 2.0 mm
2
or more.
5.3 Arrester check period
To protect the instrument from damage by induced lightning, the arrester
should be checked periodically at least once a year. In areas where
lightning occurs frequently, check should be done more often particularly
after thunderstorms.
6. Hardware Specification
Ground terminal board
3.
Connection of Arresters with Instruments to be Protected
(AR-RT)
RTD
A
B
B
Ground Ground
JIS Class 3 grounding
AR-RT AR-RT
Lightning surge
A
1
B2
3
C
Ground terminal Ground terminal
A
1
2B
C
3
JUXTA/Scott
RTD
Transmitter
GND
Permissible current leakage
Instrument side voltage limit
(at 10 kV, 1.2/50 s)
Suge discharge withstand capacity
(at 8/20 s)
Discharge starting voltage
Safety standards
Between lines
Between ground
Between lines
Between ground
Between lines
Between ground
Between lines
Between ground
Conforms to EN61010-1 Installation Category II
2 A or less (at 8 V DC)
2 A or less (at 40 V DC)
30 V or less
250 V or less
350 A
5000 A
20 V or more
74 V or more
- 2 -
IM AR04-01E 2nd Edition Sep.5 2001-00
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