Name: JUXTA VJ Series Computing Units
Brand: Yokogawa
SKU: juxta-vj-series-computing-units

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VJ Series computing units include a type that supports user-specified programs, and types that support moving averages, dead times, first-order lags/gains, constant velocity responses, limiters, and a wide range of other applications. They feature wide-range of power supply, field configurable capability and optional 2nd output. Alarm outputs or RS-485 communication are optional feature for model VJX7.

Compliant with safety standards (CE, CSA), 3 years warranty

Compact size, plug-in style and microprocessor based universal-computing unit receives DC current or DC voltage signals, applies various computing functions to them, and then converts them into isolated DC current or DC voltage signals. Various parameters such as input range and computation programs can be set and modified using a PC (VJ77).

Compact design for space saving.
The external dimensions are 76 H×29.5 W×124.5 D (mm).
Power supply voltage is either 100 to 240 V AC or 15 to 30 V DC.
The standard withstand voltage : 2000 V AC
Between Input - Output - Power - Ground
Two isolated outputs
Second isolated current or voltage (pulse) output is available as optional feature.
Communication function (VJX7)
Optional MODBUS (RS-485) communication function can be obtained simultaneously with analog output signal from one VJ.
Contact outputs (VJX7)
With the optional contact outputs (2 relay contacts), you can output in parallel with the analog output signal.
Field configuration
If you have a computer with the VJ77 parameter setting tool installed, you can set up the input range, calculation program, and other parameters on site.
Three years warranty (VJX7)
Supports overseas safety and EMC standards (CE, UL, CSA, etc.) (VJX7)
Universal Computing unit
The unit supports a wide variety of applications with user-programmable models and dedicated computational models (for moving average, idle time, primary lag/lead, linearizer, ratio setters, etc.).

Construction	Compact plug-in type (Main unit with Socket)
Mounting Method:	Wall, DIN rail, or dedicated VJ mounting base mountings
Connection Method:	M3 screw terminal
External Dimension:	Converters: 76×29.5×124.5 mm (H×W×D)
External Dimension:	VJCE Base: 130×482.6×121 or 177×482.6×121 mm (H×W×D)

VJ Mounting Base

Model	Product Name	Descriptions
VJCE	VJ Mounting Base	The multiple mounting base for VJ Series, mixed and housed up to 16 converters, JIS/EIA standards rack-mounting dimensions.

Model List

Product Name	Model (GS)	Output type			Field Configuration	3-year Warranty	Upgrade ^(*1)	Conformity Standards^(*2)
Product Name	Model (GS)	Isolated Dual-output	RS-485 Communication	Alarm or Contact (relay)	Field Configuration	3-year Warranty	Upgrade ^(*1)	CE	CSA	UL	KC	RCM
Standard Type	VJXS	√	-	-	√						√^(*3)	√^(*3)
Multi-function	VJX7	√	√	√	√	√	√	√	√	√^(*4)	√	√

Computation Function: See GS for details
Free program, Moving average computation, Dead time computation, First-order lag computation, First-order lead computation, Uniform-speed response (Velocity limiter), Limiter, Velocity computation, Linearizer, Ratio setting

√: Models that support, comply with, or are certified for various standards
- : Unsupported product
Blank : Will support in the future

*1: The aluminum electrolytic capacitor–free design provides longer life (15 to 30V DC power supply only) / Wider range of operating temperatures (-10 to 55°C)
*2: May not conform to various standards depending on some specifications. For details, see the respective product specifications.
*3: Complies with low voltage only (15–30 V DC power supply specifications only)
*4: Obtained UL compliance through CSA testing and verification

Application Note

Measurement of Discharge from Triangular and Rectangular Weirs and Other Open Channels

Can I change the burnout operation?

(ns-faq-juxta-11001-spec)

This is possible if it is a microprocessor type converter. You will need a handy terminal to make the change. (VJR6, VJT6, VJS2, MR6, MT6, MS2, and others cannot be changed.)

How is a handy terminal (JHT200) connected to a conditioner that allows range changes?

(ns-faq-juxta-11002-setting)

F and W series: dedicated 3-pin cable D series: dedicated 5-pin cable VJ, J, and M series computation unit: 5-pin cable + modular conversion (E9786WH, sold separately).

Can I change settings from a BT200 (BRAIN terminal)?

(ns-faq-juxta-11003-spec)

If it is a model that allows range changes, it is possible just like from a JHT200. However, the type of cable is different from the one that comes standard, so you will need to purchase another cable. 3-pin cable: model F9182ED 5-pin cable: model F9...

Can I change the range on the MQ0?

(ns-faq-juxta-11004-spec)

No, you can't change the range after purchase. The compact VJQ7 model does allow you to change ranges, but this requires a setting tool that is sold separately.

Can I change the range on the VJT6?

(ns-faq-juxta-11005-spec)

No, you can't change the range after purchase. The compact VJU7 model does allow you to change ranges, but this requires a setting tool that is sold separately.

How do I change settings?

(ns-faq-juxta-11006-setting)

Using the following settings tool, you can change the settings listed in the user's manual that came with the conditioner. Handy Terminals JHT-100 and JHT-200 BRAIN terminal BT200 (requires cable, sold separately) VJ77 Parameter Setting Tool...

What are the merits of plugin conditioners?

(ns-faq-juxta-11007-select)

They have the following advantages: Because you can separate the conditioner from the socket, panel work can proceed even without the conditioner. You can remove or replace the conditioner simply by plugging a new one in, so maintenance is easy. ...

How much resistance is there for current input?

(ns-faq-juxta-11010-spec)

The resistance is 250 Ω (4–20 mADC). However some computing units also have 100 Ω input.

What is the internal load resistance of pulse input?

(ns-faq-juxta-11011-spec)

You specify it for current pulse input. The resistance you specify depends on the specifications of the transmitter (mainly the rated current of the open collector). The internal load resistances are 200 Ω, 500 Ω, and 1 kΩ, and 0.5 ...

How do I determine the internal load resistance?

(ns-faq-juxta-11012-spec)

For example, if the specification of the open collector on the output side is 30 V/30 mA, use an internal load resistance of 1 kΩ (with a 24 V transmitter power supply). This results in a 0/24 mA current pulse.

There are Pt100 Ω standards of IPTS-68, ITS-90, and JPt100 Ω, but what is the difference between them?

(ns-faq-juxta-11013-other)

IPTS-68: This is an international standard from 1968 where R100/R0=1.3850 that was used by the JIS from 1989 to 1997, but currently it is not in use. ITS90: An international standard from 1990 where R100/R0=1.3851, and used by the JIS from 1997 to th...

How many instruments can be connected to a voltage output terminal (1–5 VDC)?

(ns-faq-juxta-11014-spec)

The input impedance of typical voltage input type instruments is 1 MΩ. By contrast, the allowable load impedance for voltage output is 2 kΩ or more, therefore the maximum number of units that can be connected is 500.

How many instruments can be connected to a current output terminal (4–20 mADC)?

(ns-faq-juxta-11015-spec)

The input impedance of typical current input type instruments is 250 MΩ. By contrast, the allowable load impedance for current output is 750 kΩ or more, therefore the maximum number of units that can be connected is 3.

What frequency setting should I use on an analog pulse converter when I want to output an integral pulse at 0.01㎥/P by using a 100㎥/H flowmeter?

(ns-faq-juxta-11016-spec)

100 × 1000/10/H = 10000/3600 Hz = 2.778 Hz (4 significant digits).

What does response speed **ms(10-90%) mean?

(ns-faq-juxta-11019-other)

It means the time until the output reaches 63% when input is applied in 10 Ω 90% steps.

There may be a 63% or 90% response depending on the manufacturer, but how should I compare these?

(ns-faq-juxta-11020-other)

A 90% response time is equivalent to 2.3 times the duration of a 63% response time.

What does "time constant" mean?

(ns-faq-juxta-11021-term)

In the case of conditioners, time constant reflects the response speed. In terms of a transfer function, it is expressed as OUT=INΩ(1-e EXP(-t/T)). OUT: output, IN: input, e: natural log, T: time constant, t: elapsed time When the elapsed time...

When ordering slide resistor conditioners, on models with total resistance, zero, and span resistance, what does total resistance mean?

(ns-faq-juxta-11022-other)

The total resistance ≥ zero side resistance + span resistance.

What is the output on burnout?

(ns-faq-juxta-11023-spec)

When UP, 106% of the output range or more; when DOWN, -6% or less.

What happens on a "burnout OFF"?

(ns-faq-juxta-11024-spec)

When input is interrupted it reaches ±OVER, but which of these is uncertain.

About how many computations can be included?

(ns-faq-juxta-11027-spec)

The F series has 30 steps. The W series has 40 steps. The M/VJ series has 59 steps.

What are the computation intervals of computing units?

(ns-faq-juxta-11028-spec)

On the M series you can select 50, 100, or 200 ms. On the F, W, and VJ series you can select 100 or 200 ms. (The VJXS can support 50 ms.)

Is an externally attached resistance for current input included?

(ns-faq-juxta-11033-select)

It is with plug-in types. It is also sold separately.

Do you have any conditioners that support HART communication?

(ns-faq-juxta-11034-select)

A distributor for the V series (VJA1/H), and a distributor (DA7) and isolator (DC7) for the D series are available.

How can I suppress ripple noise on the instrument's input signal?

(ns-faq-juxta-11035-spec)

Using a first-order lag or moving average computing unit helps suppress noise. You can use the following for this: M series plug-in type signal conditioners, VJ series compact plug-in type units, or F/W series front panel terminal type computing unit...

Are there any models that allow me to set up an upper or lower limit limiter on the instrument's input signal?

(ns-faq-juxta-11036-select)

You can do this with a limiter or broken-line approximation function. You can use the following for this: M series plug-in type signal conditioners, VJ series compact plug-in type units, or F/W series front panel terminal type computing units. The br...

Can I attach the VJ and M series horizontally?

(ns-faq-juxta-11037-other)

As the orientation affects heat dissemination, it cannot be horizontal.

What is the model of the VJ series terminal block (socket)? Can I use an Omron socket?

(ns-faq-juxta-11032-select)

It’s model T9093FL. The VJ socket is built with holes for screws that prevent falling off, therefore an Omron socket cannot be used.

Does the JUXTA VJ series support CCC and GB standards? Can it be used in China?

(ns-faq-juxta-11038-other)

JUXTA VJ series is not a CCC standard scope. Some models of the VJ series have acquired GB standard and can be used in China. Please contact us for applicable models. ...

The VJ series can come with a second output for RS-485 communication, but can I change VJ series parameters on upstream devices (PCs or PLCs) using this communication? Ex.: Changing the VJP8 pulse rate setting via RS-485 communication

(ns-faq-juxta-11040-spec)

Because the RS-485 communication on output 2 is reserved for I/O or error status monitoring, it cannot be used to write parameters.

If installing lightning arresters between: transmitter →safety barrier (BARD)→distributor (VJA7), are there any restrictions on where I can place them?

(ns-faq-juxta-11041-select)

As our lightning arresters are not explosion proof, they cannot be used in the configuration of instruments you described.

I purchased the VJ series, but I can't remove the main unit from the socket.

(ns-faq-juxta-11047-connect)

The black knob on the front panel is the screw that secures the main unit. Turn it counterclockwise to loosen, then remove the unit.

I purchased an isolator with a 4-20 mA current input specification. Can I use it with voltages of 1-5 VDC?

(ns-faq-juxta-11049-connect)

Yes. Wire it without using the included resistor.

Is there a converter that converts voltage pulse to a non-voltage contact?

(ns-faq-juxta-11050-select)

We have pulse repeaters such as the VJP1, and VJP8.

Can you ship the VJ series alarm setter with preset alarm types and values?

(ns-faq-juxta-11051-spec)

It is shipped with factory default settings. Alarm types and values should be set by the user with a handy terminal or the VJ77 parameter setting tool.

With a 2 output type signal conditioner, when not using a current output terminal, how should I handle the terminal processing?

(ns-faq-juxta-11052-connect)

Short with a 250 Ω resistor (rated power of 0.25 W or more). If you don't have a resistor, a simple short is fine.

There's no output with an isolator. What should I do?

(ns-faq-juxta-11055-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Use a tester to measure the input terminal voltage. For current input specifications, confirm that the acces...

There's no output with a distributor. What should I do?

(ns-faq-juxta-11056-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Measure the voltage between the input terminal (-) and COM. The normal range is 1–5 VDC. Measure the v...

There's no output with a thermocouple temperature converter. What should I do?

(ns-faq-juxta-11057-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Confirm that the accessory RJC sensor is connected to the input terminal. Short the input terminals, then confirm that the output is equivalent to th...

There's no output with an RTD temperature converter. What should I do?

(ns-faq-juxta-11058-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. For Pt100 input specifications, connect a 100 Ω resistance between input terminals A and B, short the B terminals, then confirm that the output ...

There's no output with a pulse signal repeater and pulse rate converter. What should I do?

(ns-faq-juxta-11059-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Check the pulse specifications of the other instruments. For voltage pulse, open collector, and non-voltage ...

There's no output with an analog/pulse converter. What should I do?

(ns-faq-juxta-11060-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity (+), (-) of the input wiring. Use a tester to measure the input terminal voltage. For current input specifications (applies to the...

There is no output with a pulse/analog converter. What should I do?

(ns-faq-juxta-11061-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Check the pulse specifications of the other instrument. For voltage pulse, open collector, and non-voltage c...