YOKOGAWA AR-RT User manual

User’s
Manual
1
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
https://www.yokogawa.com/ns/ar/
You can download the latest manuals from the following website:
Thank you for purchasing the arresters.
Please read through this manual before use for correct handling.
IM 77M02D01-01EN
3rd Edition: Apr. 01, 2022(YK)
CAUTIONARY NOTES FOR SAFE USE OF
THE PRODUCT
This User’s Manual should be carefully read before installing
and operating the product. The following symbol is used on the
product and in this manual to ensure safe usage.
This symbol is displayed on the product when it is
necessary to refer to the User's Manual for information
on personal and instrument safety. This symbol is
displayed in the User's Manual to indicate precautions
to avoid danger to the operator, such as an electric
shock.
The following symbols are used only in this manual.
Draws attention to essential information for
understanding the operations and/or functions of the
product.
CAUTION
The arrester may deteriorate or break if it receives
surges. Arresters that have deteriorated below a
specific level or are broken, may fail to meet their
protection performance level and must therefore be
replaced. When replacing such arresters, replace both
the main unit and the terminal block. It should be noted
that the arrester may fail to safeguard the equipment
under protection if it receives any surges exceeding its
tolerance limit, such as direct lightning strokes.
QR Code
The product has a QR Code pasted for efficient plant
maintenance work and asset information management.
It enables confirming the specifications of purchased products
and user’s manuals.
For more details, please refer to the following URL.
https://www.yokogawa.com/qr-code
* QR Code is a registered trademark of DENSO WAVE
INCORPORATED.
CHECKING PRODUCT SPECIFICATIONS
AND PACKAGE
Check that the package contains the following items:
• AR-RT: 1
• Tag number label: 1
• Terminal cover: 2
• User's Manual (this manual)
1. MOUNTING AND WIRING
WARNING
Wiring should be done after ensuring the break of each
cable.
1.1 Mounting
Mount the arrester referring the figure below.
Unit: mm
24
90
M4 screw
Panel
19
24.5
465
36-M4
Oval hole
8-ø5.5×10
483
441.6
73
89
99
50
76.2
24.7
16.5
Ɣ)5.3DQHO
1.2 External Dimensions
Unit: mm
23.5
63.5
55
8.5 (3.8)
When the latch is lowered.
26.528.5
90 53
100
DIN rail
AR8-01
(DIN rail adapter)
Main unit-fixing
screw
100
104
106
Model AR-RT
Arrester for RTD/Potentiometer

2IM 77M02D01-01EN 3rd Edition Apr. 01, 2022-00
1.3 Terminal Arrangement
Protect-side
terminal
Surge-side
terminal
A
B
C
1
2
3
+
í
Not Connected
+
í
Not Connected
Grounding
terminal
A
C
B
12
3
1.4 Wiring
NOTE
Use of arresters ignoring the specifications may cause
electric shock, overheating or damage.
1. Input signal value applied to the arrester should
meet the required specifications.
2. The external wiring to the terminals and wiring to
ground are as specifications.
Flexible twisted wire and durable round crimp-on terminal (JIS C
2805) 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 C 3306) for
electronic instrument.
(2) Grounding cables
Nominal cross-sectional area of conductor: 2.0 mm2or more
for grounding.
Example of suitable cable: 600V vinyl insulated cable (IV)
(JIS C 3307), Vinyl insulated cable
(KIV) (JIS C 3316) for electronic
instrument
1.5 Grounding
NOTE
Wire tightening torque for arrester should not be 1.2
N•m or more.
(1) Interconnect Grounding (2) Interconnect Grounding
(when using shield line)
Arrester Instrument Arrester Instrument
Apply the grounding system which is
defined by the rules and standards
of the country or the region.
Short bar
(for grounding terminal connection)
Grounding for serial installation of
arresters is to connect grounding
terminals of neighboring arresters to
each other and touch ground at one
point from last arrester according.
Make sure to earth ground the ground terminal through minimum resistance.
2. CONNECTION OF ARRESTERS WITH
INSTRUMENTS TO BE PROTECTED
Convertor
RTD AR-RT AR-RT
A
C
1
3
1
B2
3
A
2B
CGND
Ground Terminal
Ground Terminal
A
B
B
Lightning
Surge
Protect side Protect sideSurge side
Potentiometer
100%
0%
3. ENVIRONMENTAL CONDITIONS
Ambient temperature: −10 to +60°C
Relative humidity: 5 to 90% RH (No condensation)
Altitude at installation site: Max. 2000 m above sea level
Installation category based on IEC/EN61010-1: II, pollution
degree: 2 (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.
4. MANTENABCE
4.1 Arrester Checking
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 main unit-fixing screw. To check the arrester
performance, remove the main body from the socket and check
it by using the AR2-CK (arrester checker: option). If the arrester
cannot be used because the main body is deteriorated or broken,
be sure to replace both the main body and the terminal block.
The terminal block may be damaged by receiving surges. The
replacement of only the main body may fail to meet its protection
performance level.
4.2 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.
5. HARDWARE SPECIFICATION
Use RTD/Potentiometer
*
Maximum continuous
operating voltage (Uc)
Between lines 8 V DC
Between ground 40 V DC
Permissible current
leakage
Between lines 2 μA or less (at 8 V DC)
Between ground 2 μA or less (at 40 V DC)
Instrument side voltage
limit (10 kV, 1.2/50 μA)
Between lines 30 V or less
Between ground 250 V or less
*Voltage protection
level (Up)
Between lines 150 V or less
Between ground 350 V or less
*Impulse durability
(8/20 μA)
Category C1 500 A
Category C2 5000 A
Discharge starting
voltage
Between lines 20 V DC or more
Between ground 74 V DC or more
*Rated current 2 A DC
JIS compliant JIS C 5381-21 (Category: C1, C2)
*: Description compliant with JIS C 5381-21.