JUXTA VJ Series Limit Alarms

The VJ series limit alarms are compact, plug-in type alarm setting devices with easy-to-use functions. Five models are available: the VJAK for 2-wire system transmitters; the VJHK with DC voltage/DC current inputs; the VJRK with RTD inputs; the VJTK with thermocouple inputs; and the VJUK with universal inputs.

  • Alarm output signal
    2 point alarm (relay a, contact. 2 points)
  • Parameter setting
    Each parameter setting can be changed using a PC (VJ77 PC-based parameters setting tool).

Details

  • 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
  • Alarm outputs
    2 point alarm (relay a, contact. 2 points)
  • Field configuration
    From a computer with the VJ77 parameter setting tool installed, you can change each parameter setting.
  • Three years warranty
  • Supports overseas safety and EMC standards (CE, UL, CSA, etc.) (VJUK)
  • Universal Limit Alarms (VJUK)
    An alarm setter that supports voltage, current, TC/RTD, and mV input signals. Offers 2 independent alarm outputs.
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: Limit Alarm: 76×29.5×124.5 mm (H×W×D)
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.

Limit Alarms

Model Product Name Input Type Output Type Descriptions
VJAK Limit Alarm (with Transmitter Power Supply) DC current Alarm output 2 outputs type
VJHK Limit Alarm DC current or DC voltage Alarm output 2 outputs type
VJRK RTD Alarm output 2 outputs type
VJTK Thermocouple Alarm output 2 outputs type
VJUK Limit Alarm (DC, temperature input type) Universal
(DC voltage/current, thermocouple/RTD, or mV signal)
Alarm output 2 outputs type

Model List

Limit Alarms

Product Name Model
(GS)
Output type Field
Configuration
3-year
Warranty
Upgrade
(*1)
Conformity Standards(*2)
Isolated
Dual-output
RS-485
Communication
Alarm or
Contact
(relay)
CE CSA UL KC RCM
Universal Type VJUK - (*3)
DC Voltage Input Type VJHK -          
DC Current Input Type VJAK -          
Thermocouple Input Type VJTK -          
RTD Input Type VJRK -          

√: 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: Obtained UL compliance through CSA testing and verification

Resources

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.)
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).
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. ...
The resistance is 250 Ω (4–20 mADC). However some computing units also have 100 Ω input.
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 ...
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.
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...
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.
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 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.
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...
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.
The F series has 30 steps. The W series has 40 steps. The M/VJ series has 59 steps.
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.)
It is with plug-in types. It is also sold separately.
A distributor for the V series (VJA1/H), and a distributor (DA7) and isolator (DC7) for the D series are available.
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...
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...
As the orientation affects heat dissemination, it cannot be horizontal.
It’s model T9093FL. The VJ socket is built with holes for screws that prevent falling off, therefore an Omron socket cannot be used.
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. ...
Because the RS-485 communication on output 2 is reserved for I/O or error status monitoring, it cannot be used to write parameters.
As our lightning arresters are not explosion proof, they cannot be used in the configuration of instruments you described.
The black knob on the front panel is the screw that secures the main unit. Turn it counterclockwise to loosen, then remove the unit.
Yes. Wire it without using the included resistor.
We have pulse repeaters such as the VJP1, and VJP8.
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.
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.
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...
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...
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...
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 ...
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 ...
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...
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...
Resistors come with isolators that have terminal block format current input specifications. Please attach it to the input terminals before use.
Yes. To satisfy the performance specifications, you should power the unit for 10–15 minutes.
PCBs were banned from manufacturing and imports in 1975. JUXTA was first released in 1987, therefore they should not include PCBs.
The open collector needs a power supply. Use one within the maximum allowable load. ...
You can download these items from the Partner Portal member site *Log-in Required. You must register (free) to use Partner Portal.
A thermocouple welds one end of two dissimilar metals and measures the thermoelectromotive force from a converter terminal. The thermocouple output voltage is affected by the temperature at both ends, so you must measure the temperature of the termin...
Allowable conduction resistance is resistance that can be used for the conductor between the input side instrument and the input terminal of the signal conditioner.
What is a thermocouple (TC?)
(ns-faq-juxta-20073-term)
A thermocouple (TC) is a temperature sensor based on the principle that an electric current is generated when a temperature difference is applied to a closed circuit created by putting together two metals of different types. (ThermoCouple)
With the JUXTA series, there is no 0% output below the low cut point. This would be linear output.
Yes, the following can be mounted on DIN rails. VJ series M series F series W series
See “Preventive Maintenance of Signal Conditioners” in TI 77J00B01-01.
What does span mean?
(ns-faq-juxta-20029-term)
Span means width, and is the width of the setting range.

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