Yokogawa VJS7 User Manual

User’s
Manual

Model VJS7
Potentiometer Converter

(Isolated Single-output and Isolated Dual­output Types)

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

IM 77J01S07-01E

5th Edition Mar. 2012(YK)

Network Solutions Business Division

2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: [phone] Facsimile: [phone]

CAUTIONARY NOTES FOR SAFE USE OF
THE PRODUCT

This User’s Manual should be carefully read before installing
and operating the product. The following symbol is used on the
product and in this manual to ensure safe usage.

This symbol is displayed on the product when it is
necessary to refer to the User's Manual for information
on personal and instrument safety. This symbol is
displayed in the User's Manual to indicate precautions
to avoid danger to the operator, such as an electric
shock.

The following symbols are used only in this manual.

Note

Draws attention to essential information for
understanding the operations and/or functions of the
product.

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:

• VJS7: 1

• Tag number label: 1

• Range label: 1

• User's Manual (this manual)

GENERAL

This plug-in type converter is used in combination with
transmitters which send displacement information of regulator
valves by resistance change signals from a potentiometer, and
converts the resistance change into isolated DC current or DC
voltage signals.
Output-2 can be selected from DC voltage signal, DC current

signal, communication function (RS-485), or alarm output (2
relay contacts).

Various parameters such as input range can be set and modied

using a PC (VJ77) or Handy Terminal (JHT200 and the like).

MODEL AND SUFFIX CODES

Model Sufx codes Description
VJS7 -0 □ □ -□ □ □ 0 /□□ Potentiometer Converter

Output
conguration

Power supply 6 100-240 V AC/DC

Input signal -1 Potentiometer resistance

Output-1 A 4 to 20mA DC

Output-2 A 4 to 20mA DC

Options Blank: With socket

*1 Operating range: 85-264 V
*2 Operating range: 12-36 V
*3 DC voltage signal or DC current signal

-0 Always 0
1 Single
2 Dual

7 15-30V DC

(Total resistance: 100Ω to
10kΩ)

B 2 to 10mA DC
C 1 to 5mA DC
D 0 to 20mA DC
E 0 to 16mA DC
F 0 to 10mA DC
G 0 to 1mA DC
1 0 to 10mV DC
2 0 to 100mV DC
3 0 to 1V DC

4 0 to 10V DC
5 0 to 5V DC
6 1 to 5 V DC
7 −10 to +10V DC
Z (Custom Order)

6 1 to 5V DC
P Communication function

(RS-485)

T High/low limit alarm output

(2 relay contacts)

N None

0 Always 0

/SN Without socket

[STYLE: S1]

(*1)

(*2)

(*3)

1

1. MOUNTING METHOD

Mounting

Note

Insert/pull out the main unit into/from the socket
vertically to the face of socket. Otherwise the terminals
are bent and it may cause a bad contact.

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.

screws

Main unit

Mounting Dimensions

Socket

29.5 or more

22±0.2

Unit: mm

2-M4 or
2-ø4.5 or more

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

Input

100%

1

CENTER

3

0%

4

Power Supply

1110 8

N–

L+

GND

3 2

1011

56

1

4

789

Output-2

Analog output

+

2

–

5

Output-1

Analog output

+

7

–

9

Alarm output

ALM1

2

COM

5

ALM2

6

RS-485

Communication

2

5

6

B+

A–

COM

Main unit-fixing
screw

Threaded hole for
fixing the main unit

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

Fit into here

DIN rail

DIN rail

Push

(Rear of socket)

DIN rail

Slide look

1.3 Mounting Using

When using a multi-mounting base, see the User's Manual for
VJCE (VJCE Mounting Base).

1.4 Using a Duct

When using a wiring duct, install the duct at least 30 mm away
from the top and bottom faces of the main unit.

2. INSTALLATION LOCATION

● Avoid the following environments for installation locations:
Areas with vibration, corrosive gases, dust, water, oil, solvents,
direct sunlight, radiation, a strong electric eld, and/or a strong
magnetic eld, altitude of more than 2000m above sea level.

● 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 this converter and a eld-installed device.

● Operating temperature/humidity range: 0 to 50C/5 to 90%RH
(no condensation)

Note

● Do not use output-2 for the 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.

● The grounding resistance must be 100 Ω or less

(JIS Class D grounding). 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

● 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.

● Do not operate the product in the presence of

ammable or explosive gases or vapors. To do so is
highly dangerous.

● 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.

● The use of inductance (L) loads such as auxiliary

relays and solenoid valves causes malfunction or
relay failure; always insert a CR lter or diode for
spark-removal into the line in parallel with the load.
Recommended CR

• C: 0.5 to 1F against contact current 1 A

• R: 0.5 to 1 against contact voltage 1 V

● For 15-30 V DC

measure, always install a circuit breaker (an IEC
60947-compatible product, 5 A, 100 V or 220 V AC)
in an easily accessible location near the instrument.
Moreover, provide indication that the switch is a
device for turning off the power to the instrument.

(±20%) power supply, as a safety

3. EXTERNAL WIRING

WARNING

Be sure to turn OFF the power supply before wiring to
avoid the risk of electric shock. Use a tester or similar
device to ensure that no power is being supplied to a
cable to be connected.

2

IM 77J01S07-01E 5th Edition Mar. 02, 2012-00