Yokogava VJA5 User Manual
User’s
Manual
Model VJA5
Distributor
(with Square Root Extractor)
(Isolated Single-output and
Isolated Dual-output Types)
Thank you for purchasing the JUXTA Signal Conditioner.
Please read through this manual before use for correct handling.
IM 77J01A05-01E
6th Edition Mar. 2021 (YK)
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: +81-422-52-7179 Facsimile: +81-422-52-6793
You can download the latest manuals from the following website:
http://www.yokogawa.com/ns/juxta/im/
CAUTIONARY NOTES FOR SAFE USE OF THE PRODUCT
This User’s Manual should be carefully read before installing and
operating the product. Please keep this User’s Manual for future
reference.
refer to the “Precautions on the Use of the JUXTA Series (IM
77J01A00-91Z1)”.
are shown in the table below.
Doc. Name Doc. Number
Precautions on the Use of the JUXTA Series
Model VJA5 Distributor (User’s Manual) IM 77J01A05-01E
Model VJA5 Distributor (General Specications) GS 77J01A05-01E
User’s manuals in the above table are essential parts of the
product; keep it in a safe place for future reference.
This manual is intended for the following personnel;
• Engineers responsible for installation, wiring, and
• Personnel responsible for normal daily operation of the
The following symbol is used on the product and in this manual to
ensure safe usage.
QR Code
The product has a QR Code pasted for ecient plant
maintenance work and asset information management.
It enables conrming the specications of purchased products
and user’s manuals.
For more details, please refer to the following URL.
For more information of the safety precautions, please
The related manuals and general specications
(User’s Manual)
IM 77J01A00-91Z1
(This manual)
maintenance of the equipment.
equipment.
WARNING
Calls attention to actions or conditions that could
cause serious or fatal injury to the user, and indicates
precautions that should be taken to prevent such
occurrences.
CAUTION
Calls attention to actions or conditions that could
cause injury to the user or damage to the instrument
or property and indicates precautions that should be
taken to prevent such occurrences.
https://www.yokogawa.com/qr-code
* QR Code is a registered trademark of DENSO WAVE
INCORPORATED.
GENERAL
This plug-in type distributor is used in combination with a twowire type transmitter to calculate the square root of 4 to 20 mA
DC input signals from the transmitter and then convert them into
isolated DC current or DC voltage signals.
MODEL AND SUFFIX CODES
Model Sux codes Description
VJA5 -0 x x -A x x 0 /x
Fixed code
Output
Power supply
Input signal -A
Output-1 signal
Output-2 signal
Fixed code 0 Always 0
Option
*1: Operating range: 85 to 264V AC/DC
*2: Operating range: 12 to 36V DC
*3: DC voltage signal or DC current signal
*4: When option code /C0 or /FB is specied, the conformity to the safety
-0 Always -0
1 1 output
2 2 outputs
6 100-240 V AC/DC
7 15-30 V DC
A 4 to 20 mA DC
B 2 to 10 mA DC
C 1 to 5 mA DC
D 0 to 20 mA DC
E 0 to 16 mA DC
F 0 to 10 mA DC
G 0 to 1 mA DC
1 0 to 10 mV DC
2 0 to 100 mV DC
3 0 to 1 V DC
4 0 to 10 V DC
5 0 to 5 V DC
6 1 to 5 V DC
7 −10 to +10 V DC
Z Custom order
A 4 to 20 mA DC
6 1 to 5 V DC
N No output-2
Z Custom order
and EMC standards is excluded. CE marking is not applicable.
Distributor (with Square Root
Extractor)
*2
4 to 20 mA DC
Transmitter power supply:
25.25±0.25 V DC
No socket (with socket if not
/SN
specied)
/C0 Coating
/FB Fuse bypass
*4
*1
*3
*3
*4
CHECKING PRODUCT SPECIFICATIONS AND PACKAGE
(1) Checking the Model and Product Specications
Check that the model and specications indicated on the
nameplate attached to the main unit are as ordered.
(2) Packaged Items
Check that the package contains the following items:
• VJA5: 1 unit
Standard Accessories:
• Tag number label: 1 sheet
• User’s manual (IM 77J01A05-01E, this manual): 1 copy
• User’s manual (IM 77J01A00-91Z1): 1 copy
Note: An exclusive User’s Manual might be attached to the
products whose sux codes or option codes contain the code
“Z” (made to customers’ specications). Please read it along
with this manual.
1
1. MOUNTING METHOD
4.5 or more
Mounting Dimensions
Main unit-fixing screw
DIN rail
Slide lock
Fit into here
When using
When using
CAUTION
● Plug/disconnect the main unit into/from the
socket vertically to the socket face. Otherwise the
terminals may bend and it may cause bad contact.
● The converter shall not tilt 5 degrees or more in
either direction when installed.
● When the converter is not connected to the socket,
it is necessary to protect the socket against ingress
of dust to the connector part.
● Keep this product in a conductive bag when
plugged out, during transport or storage.
1.1 Wall Mounting
Loosen the main unit-xing screw of the product and pull out the
main unit from the socket. Fix the socket on the wall with screws.
Next, insert the main unit into the socket and fasten the main unit
with the main unit-xing screw.
Mounting screws
Main unit
Socket
Threaded hole for
fixing the main unit
29.5 or more
22±0.2
59±0.3
1.2 DIN Rail Mounting
Insert a DIN rail into the upper part of the DIN rail groove on the
rear of the socket, and then slide the slide lock at the lower part
of the socket upwards until the socket is xed into position as
shown below.
DIN rail
DIN rail
Push
(Rear of socket)
2-M4 or
2-ø
Unit: mm
• Operating temperature/humidity range: −10 to 55°C (−10
to 45°C for side-by-side mounting*)/5 to 90%RH (no
condensation)
* If the previous model (style S3.xx earlier) is installed
together, the ambient temperature is 0 to 40°C.
• Continuous vibration: (at 5 to 9 Hz) Half amplitude of 3 mm or
less (at 9 to 150 Hz) 9.8m/s2 or less, 1 oct/min for 90 minutes
each in the three axis directions
• Impact: 98 m/s
2
or less, 11 ms, 3 axes, 6 directions, 3 times
each
3. EXTERNAL WIRING
WARNING
● To avoid the risk of an electric shock, turn o the
power supply and use a tester or similar device to
ensure that no power is supplied to a cable to be
connected, before carrying out wiring work.
● Do not operate the product in the presence of
ammable or explosive gases or vapors. To do so
is highly dangerous.
● Use of the product ignoring the specications may
cause overheating or damage. Before turning on
the power, ensure the following:
• Power supply voltage and input signal value
applied to the product should meet the required
specications.
• The external wiring to the terminals and wiring to
ground are as specications.
Wiring should be connected to the terminals on the socket of
the product. The terminals for external connections are of M3
screws. Use crimp-on terminal lugs for connections to the
terminals.
• Recommended cables: A nominal cross-sectional area of
Wiring Diagram
2
0.5 mm
or thicker for signal cables, and that of 1.25 mm2 or
thicker for power cables.
3 2
1
5
4
789
1011
internal power
supply
Transmitter Transmitter Transmitter
+
–
Output-2
+
2
–
5
PS+
–
1
3
external power
supply
+
–
–
COM
When using as
an isolator
+
–
3
4
+
–
3
4
1.3 Mounting Using a Multi-mounting Base
When using a multi-mounting base, see the User’s Manual for
VJCE-01A (VJ Mounting Base for communication) (IM 77J01C5111E).
1.4 Using a Duct
When using a wiring duct, install the duct at leaset 30 mm away
from the top and bottom faces of the main unit.
2. INSTALLATION AND ENVIRONMENTAL CONDITIONS
• Avoid the following environments for installation locations:
Areas with vibrations, corrosive gases, dust, water, oil,
solvents, direct sunlight, radiation, a strong electric eld,
and/or a strong magnetic eld, direct radiant heat, wind,
temperature uctuation.
• If there is any risk of a surge being induced into the power line
and/or signal lines due to lightning or other factors, a dedicated
lightning arrester should be used as protection for both the
product and a eld-installed device.
• Use indoors at an altitude of 2000 m or less.
Power supply
1110 8
N–
L+
GND
Output-1
+
7
–
9
CAUTION
● Do not use output-2 for the isolated single-output
type.
● The power line and input/output signal lines should
be installed away from noise-generating sources.
Other wise accuracy cannot be guaranteed.
● Make sure to earth ground the ground terminal
through minimum resistance. The length and
thickness of the grounding cable should be as
short and thick as possible. Directly connect the
lead from the ground terminal (terminal no. 8) of
the product to the ground. Do not carry out daisychained inter-ground terminal wiring.
● The product is sensitive to static electricity;
exercise care in operating it. Before you operate
the product, touch a nearby metal part to discharge
static electricity.
● If the ambient temperature is 50 °C or more, please
use the cable that the rated temperature is 70 °C or
more.
2
IM 77J01A05-01E 6th Edition
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