Yokogawa VJA4 User Manual

User ’s Manual

Model VJA4 Distributor (Non-isolated)

(1-channel and 2-channel Types)

Thank you for purchasing the JUXTA Signal Conditioner. Please read through this manual before use for correct handling.

IM 77J01A04-01E

4th Edition Apr. 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. For more information of the safety precautions, please refer to the “Precautions on the Use of the JUXTA Series (IM 77J01A0091Z1)”.

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 Model VJA4 Distributor (User’s Manual) IM 77J01A04-01E

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.

(User’s Manual)

IM 77J01A00-91Z1

(This manual)

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 x N 0 /x Distributor (Non-isolated)

Fixed code

Output

Power supply

Input signal -A

Output signal

Fixed code N Always N Fixed code 0 Always 0

Option

*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

Note: An exclusive User’s Manual might be attached to the

-0 Always -0

1 1-channel 2 2-channel

6 100-240 V AC/DC 7 15-30 V DC

A 4 to 20 mA DC 6 1 to 5 V DC

and EMC standards is excluded. CE marking is not applicable.

4 to 20 mA DC

Transmitter power supply:

25.25±0.25 V DC

No socket (with socket if not

/SN

specied)

/C0 Coating /FB Fuse bypass

products whose su󰀩x codes or option codes contain the code “Z” (made to customers’ specications). Please read it along with this manual.

1. MOUNTING METHOD

4.5 or more

Mounting Dimensions

Main unit-fixing screw

Main unit

DIN rail

Slide lock

Fit into here

When internal power is used

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

Threaded hole for fixing the main unit

Socket

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

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

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

Wiring Diagram

0.5 mm

or thicker for signal cables, and that of 1.25 mm2 or

thicker for power cables.

Input for Channel 1

PS+

Transmitter

–

3 2

Input for Channel 2

PS+

Transmitter

–

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

• 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.

DIN rail

CONDITIONS

Push

(Rear of socket)

Output for

Channel 1

–

1011

Power supply

1110 8

N–

L+

789

GND

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 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.

IM 77J01A04-01E 4th Edition

+ 2 hidden pages