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
http://www.yokogawa.com/ns/juxta/im/
You can download the latest manuals from the following website:
IM 77J01A21-01E
3rd Edition June 2022 (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 specifications
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 VJAK Limit Alarm for DC Current Input (User’s
Manual)
IM 77J01A21-01E
(This manual)
Model VJAK Limit Alarm for DC Current Input
(General Specifications)
GS 77J01A21-01E
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 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 THE PRODUCT SPECIFICATIONS
AND THE CONTENTS OF PACKING
(1) Model and Specifications Check
Check that the model and specifications indicated on the nameplate
attached to the side face of the main unit are as ordered.
(2) Contents of the Packing
Check that the package contains the following items:
• VJAK: 1
Standard Accessories:
• Tag number label: 1 sheet
• User’s manual (IM 77J01A21-01E, this manual): 1 copy
• User’s manual (IM 77J01A00-91Z1): 1 copy
GENERAL
This plug-in type Limit Alarm for DC current input receives 4 to
20 mA DC current signal. It is used in combination with two-wire
type transmitter.
• Each parameter setting can be changed using a PC (VJ77
PC-based Parameters Setting Tool).
MODEL AND SUFFIX CODES
Model
Suffix codes
Description
VJAK
-0 2
x
-A T 0 0
/x
Limit Alarm for DC Current Input
Fixed
code
-0
Always -0
Output
configuration
2
2 outputs
Power supply
6
100-240 V AC/DC
*1
7
15-30 V DC
*2
Input signal
-A
4 to 20 mA DC
(Transmitter power supply:
25.25 ± 0.25 V DC)
Output signal
T
Alarm output (2 relay contacts)
Fixed code
0
Always 0
Fixed code
0
Always 0
Option
/SN
No socket (with socket if not
specified)
/C0
HumiSeal coating
/FB
Fuse bypass
*1: Operating range: 85 to 264V AC/DC
*2: Operating range: 12 to 36V DC
*3: DC voltage signal or DC current signal
1. MOUNTING METHODS
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.
Model VJAK
Limit Alarm
for DC Current Input
