Yokogawa JUXTA VJA7 User Manual download pdf

User’s

Manual

Model VJA7

Distributor (Multi-function)

(Isolated Single-output and

Isolated Dual-output Types)

IM 77J01A07-01E

1st Edition Nov. 1999

2nd Edition June 2004

1. CAUTIONARY NOTES FOR SAFE

USE OF THE PRODUCT

For the correct use of this product, read through this manual before

use. The following safety symbol is indicated on the product to en-

sure safe use.

CAUTION

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 instru-

ment. The manual describes the special care the operator

should exercise to avoid shock or other dangers that may re-

sult in injury or loss of life.

The following symbol marks are used only in this manual.

IMPORTANT

Indicates that operating the hardware or software in a par-

ticular manner may damage it or result in a system failure.

NOTE

Draws attention to information that is essential for under-

standing the operations and/or features of the product.

2. CHECKING PRODUCT SPECIFI-

CATIONS AND THE CONTENTS

OF PACKING

(1) Model Number and Specification Check

Check that the model number and specifications shown on the

nameplate attached on the side of the product are as ordered.

(2) Contents of the Packing

Check that the packing contains the following items:

● VJA7 main unit, 1

● Instruction Manual (IM 77J1A07-01E), 1

● Tag number label, 1

3. GENERAL

This distributor, which belongs to the JUXTA series of signal condi-

tioners, receives 4 to 20 mA DC signals from two-wire transmitters

while supplying power to transmitters and converting the received

signal to pairs of isolated current and voltage signals.

• Output-2 signal is selectable from a DC voltage signal, DC

current signal, communication function (RS-485), and alarm

output (two relay contacts).

4. MOUNTING METHODS

4.1 Wall Mounting

Loosen the main unit-fixing screw of the distributor to disconnect

the main unit from the socket. Next, anchor the socket onto the

wall with screws. Then, plug the main unit into the socket and se-

cure the main unit with the main unit-fixing screw.

Main

unit-fixing

screw

Socket

Main unit

Threaded hole for

fixing the main unit

Mounting

screws

Unit: mm

29.5 or more

22±0.2

59±0.3

2-M4 or 2-ø4.5 or more

Fig. 4.1

4.2 DIN Rail Mounting

Locate the distributor so that the DIN rail fits into the upper part of

the DIN-rail groove at the rear of the socket, and fasten the socket

using the slide lock at the lower part of the socket.

Slide lock

DIN rail

VIEW A (Rear of socket)

VIEW A

Fig. 4.2

Keep this manual in a safe place.

Network Solutions Business Divisiion

2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan

Phone: +81-422-52-7179 Facsimile: +81-422-52-6793

1 2 3 4 5

Summary of Contents

Page 1 - Distributor (Multi-function)

User’sManualModel VJA7Distributor (Multi-function)(Isolated Single-output andIsolated Dual-output Types)IM 77J01A07-01EIM 77J01A07-01E1st Edition Nov.

Page 2 - 6. EXTERNAL WIRING

Page 3 - 8. SETTING PARAMETERS

Page 4 - 8.3.3 Hysteresis

Page 5 - 11.MAINTENANCE

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