YOKOGAWA Juxta VJA4 User manual

User’s
Manual
1
Thank you for purchasing the JUXTA Signal Conditioner.
Please read through this manual before use for correct handling.
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: [phone] Facsimile: [phone]
http://www.yokogawa.com/ns/juxta/im/
You can download the latest manuals from the following website:
IM 77J01A04-01E
4th Edition Apr. 2021 (YK)
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.
For more information of the safety precautions, please refer to
the “Precautions on the Use of the JUXTA Series (IM 77J01A00-
91Z1)”.
The related manuals and general specications are shown in the
table below.
Doc. Name Doc. Number
Precautions on the Use of the JUXTA Series (User’s Manual) IM 77J01A00-91Z1
Model VJA4 Distributor (User’s Manual) IM 77J01A04-01E
(This manual)
Model VJA4 Distributor (General Specications) GS 77J01A04-01E
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 maintenance
of the equipment.
• Personnel responsible for normal daily operation of the
equipment.
The following symbol is used on the product and in this manual to
ensure safe usage.
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.
QR Code
The product has a QR Code pasted for e󰀩cient plant
maintenance work and asset information management.
It enables conrming the specications 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
(1) Checking the Model and Product Specications
Check that the model and specications indicated on the
nameplate attached to the main unit are as ordered.
(2) Packaged Items
Check that the package contains the following items:
• VJA4: 1 unit
Standard Accessories:
• Tag number label: 1 sheet
• User’s manual (IM 77J01A04-01E, this manual): 1 copy
• User’s manual (IM 77J01A00-91Z1): 1 copy
GENERAL
This plug-in type distributor is used in combination with 2-wire
type transmitters and converts 4 to 20 mA DC signals into DC
current or DC voltage signals.
The input/output signal is non-isolated.
• 1-channel or 2-channel type can be selected.
MODEL AND SUFFIX CODES
Model Su󰀩x codes Description
VJA4 -0 x x -A xN 0 /x Distributor (Non-isolated)
Fixed code
-0 Always -0
Output 11-channel
22-channel
Power supply 6100-240 V AC/DC*1
715-30 V DC*2
Input signal -A
4 to 20 mA DC
Transmitter power supply:
25.25±0.25 V DC
Output signal A4 to 20 mA DC
61 to 5 V DC
Fixed code NAlways N
Fixed code 0Always 0
Option
/SN No socket (with socket if not
specied)
/C0 Coating *3
/FB Fuse bypass *3
*1: Operating range: 85 to 264 V AC/DC
*2: Operating range: 12 to 36 V DC
*3: When option code /C0 or /FB is specied, the conformity to the safety
and EMC standards is excluded. CE marking is not applicable.
Note: An exclusive User’s Manual might be attached to the
products whose su󰀩x codes or option codes contain the code
“Z” (made to customers’ specications). Please read it along
with this manual.
Model VJA4
Distributor (Non-isolated)
(1-channel and 2-channel Types)

2IM 77J01A04-01E 4th Edition
1. MOUNTING METHOD
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.
29.5 or more
22±0.2
2-M4 or
2-ø
4.5 or more
Mounting Dimensions
Unit: mm
59±0.3
Main unit-fixing screw
Socket
Main unit
Threaded hole for
fixing the main unit
Mounting screws
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
(Rear of socket)
Slide lock
DIN rail
Fit into here
Push
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 77J01C51-
11E).
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.
• 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/s2or less, 1 oct/min for 90 minutes
each in the three axis directions
• Impact: 98 m/s2 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 specications 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
specications.
•The external wiring to the terminals and wiring to
ground are as specications.
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
0.5 mm2or thicker for signal cables, and that of 1.25 mm2or
thicker for power cables.
Wiring Diagram
1011
3 2 1
4
56
789
When internal power is used
4
6
Transmitter PS+
–
+
–
Input for Channel 2
When internal power is used
Power supply
1110 8
L+N–GND
Output for Channel 1
+
–
9
7
Input for Channel 1
1
3
Transmitter PS+
–
+
–
+
–
5
2
Output for Channel 2
CAUTION
●Do not use the channel 2 terminal for the 1-channel
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 daisy-
chained 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.

3IM 77J01A04-01E 4th Edition
4. MAINTENANCE
The product starts running immediately when the power is turned
on; however, it needs 10 to 15 minutes of warm-up before it
meets the specied performance.
4.1 Calibration Apparatus
• A DC voltage/current standard (YOKOGAWA GS200 or the
equivalent)
• A digital multimater (YOKOGAWA DM7561 or the equivalent)
• A precision resistor of 250 Ω ± 0.01%, 1 W
4.2 Calibration Procedure
1. Connect the instruments as shown below. First check the
channel 1 signal and then the channel 2 signal.
R: 250 Ω
precision resistor
for current output
R: 250 Ωprecision resistor
for current output
Power supply
With SINK current With SINK current
Without SINK current Without SINK current
OutputOutput
DC voltge/
current
standard
DC voltge/
current
standard
DC voltge/
current
standard
DC voltge/
current
standard
1011
3 2 1
4
56
789
1110 8
L+N–GND
3
9
+
–
Input
Channel 1 Channel 2
DMM
7
9
R
+
–
1
3
+
–
6
5
+
–
Input
4
6
+
–
DMM
2
5
R
+
–
2. Use the DC voltage/current standard and apply input signals
equivalent to 0, 25, 50, 75, and 100% of the input span to the
product.
3. Check to see the corresponding output voltages are 0, 25, 50,
75, and 100% respectively and within the specied accuracy
rating. “R” is used for current output.
5. SAFETY AND EMC STANDARDS
Safety:
IEC/EN 61010-1 compliance (CE)
IEC/EN 61010-2-030 compliance (CE)
CAN/CSA-C22.2 No.61010-1 (CSA)
CAN/CSA-C22.2 No.61010-2-030 (CSA)
UL61010-1 (CSA NRTL/C)
UL61010-2-030 (CSA NRTL/C)
Overvoltage category: II
Pollution degree: 2
Measurement category: O (other)
Rated power supply voltage: 15-30 V DC (±10%) 2.2 W or
100-240V AC/DC (±10%)
50/60 Hz 2.6 W 5.3 VA
Rated voltage (Input signal) : 25.5 V DC
Rated voltage (Analog output signal): 1 to 5 V DC,
4 to 20 mA DC
Rated transient overvoltage: 1500 V (*)
* This is a reference safety standard value for the
measurement Category O. This value is not necessarily
a guarantee of instrument performance.
CAUTION
This instrument is for Measurement Category O
(other). Do not use it for measurements in locations
falling under Measurement Categories II, III, and IV.
Internal Wiring
Outlet
Entrance
Cable
III T
O
II
IV
Measurement
category
Description Remarks
O (other) For measurements
performed on circuits not
directly connected to MAINS.
II CAT.II For measurements
performed on circuits directly
connected to the low-voltage
installation.
Appliances,
portable
equipments,
etc.
III CAT.III For measurements
performed in the building
installation.
Distribution
board, circuit
breaker, etc.
IV CAT.IV For measurements
performed at the source of
the low-voltage installation.
Overhead
wire, cable
systems, etc.
EMC standards:
•CE:
EN 61326-1 Class A, Table 2
EN 61326-2-3
* The instrument continues to operate at a measurement
accuracy of within ±20% of the range during testing.
EN 55011 Class A, Group 1
EN 61000-3-2
EN 61000-3-3
•RCM:
EN 55011 Class A, Group 1
•KC:
Electromagnetic wave interference prevention standard,
electromagnetic wave protection standard
CAUTION
Caution to comply with EMC standards: When
operating this instrument by external power supply,
use an independent power unit conforming to CE-
marking. Be sure to use the lightning arrester to
comply EMC standards.
Note: When option code /C0 or /FB is specied, the conformity to
the safety and EMC standards is excluded.

4IM 77J01A04-01E 4th Edition
6. ENVIRONMENT STANDARD
EU RoHS directive: EN IEC 63000
(However, when option code /C0 or /FB is specied, CE mark-
ing is not applicable because the product does not comply
with the Safety and EMC standards.)
7. TRANSPORT AND STORAGE CONDITIONS
• Temperature: −25 to 70°C
• Temperature change rate: 20°C per hour or less
• Humidity: 5 to 95%RH (no condensation)
CAUTION
Keep this product in a conductive bag when plugged
out, during transport or storage.