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VJS7 Potentiometer Converter
Brand: YokogawaThe VJS7 is a compact, plug-in potentiometer converter that is used in combination with an instrument to transmit information for displacement of valve, etc. by resistance change of potentiometer. It converts the resistance changes into isolated DC current or DC voltage signals.
Features- Output-2 can be selected from DC voltage signal, DC current signal, communication output (RS-485) or alarm output (2 relay contacts)
- Various parameters such as input range can be set and modified using a PC (VJ77) or handy terminal (JHT200 or the like)
Specifications
Brand
Accuracy
- ± 0.1% of Span
Alarm
- 0 to 100% of Input Range - Alarm Setting Range
- High/Low Limit - Alarm Operating Direction
Approvals & Certifications
- CAN/CSA C22.2 No. 61010-1
- CE EN 61326-1
- EMC
- KC
- UL 61010-1
Burn-Out
- Downscale
- Off
- Upscale
- Within 60 seconds - Burn-out Time
Communication
- 2-Wire Half-Duplex (Start-Stop Synchronization, Non-procedural)
- Baud Rate: 1,200, 2,400, 4,800, 9,600 bit/sec
- Data Length: 7-bits, 8-bits
- EIA RS-485
- LADDER Communication
- Modbus ASCII/RTU
- PC-Link Communication Protocol
- PC-Link with Sum
- Stop Bit: 1-bit, 2-bits
Display
- Front LED Lights at Alarm, 2 LEDs - Alarm Operation Display
Dissipation
- 2.5 W at 24 Vdc - Power Dissipation
- 2.6 W at 110 Vdc - Power Dissipation
- 5 VA at 100 Vac - Power Dissipation
- 6.7 VA at 200 Vac - Power Dissipation
Distance
- 3,937 feet (1,200 meters) - Maximum
Electrical Connectors
- M3 Screw Terminal
Electrical Contacts
- Normally Open Contact Output (Contact ON at Excitation) 2-Points, COM Common - Output Signal
Electrical Rating
- 1 A at 30 Vdc - Contact Capacity
Enclosure, Body Material
- Modified Polyphenylene Oxide
Frequency
- 47 to 63 Hz
Humidity
- 5 to 90% Relative Humidity, Non-Condensing
Hysteresis
- 0 to 100% of Input Range - Hysteresis Setting Range
- 3% (Alarm-1/2)
Input
- 3-Wire Potentiometer (Full Resistance: 100 to 10,00 KiloOhms)
- 50% or less of Full Resistance or 1 KiloOhms Per Leadwire, Equal or less than whichever is Small - Permissible Input Conductor Resistance
Insulation Resistance
- 100 MegaOhms at 500 Vdc between Input, Output-1, Output-2, Power Supply & Ground Mutually
Measurement Accuracy
- Within ± 20% of the Range During Testing
Measuring Span
- 50 to 10,000 ohms
Measuring Voltage
- 0.5 Vdc Approximately
Mounting
- Base Mounting (Only when Output 2 is Analog Output) - VJ Mounting
- Compact Plug-in Typical - Construction
- DIN Rail Mounting
- Wall Mounted
Output
- 0 to 100 mVdc
- 0-20 mA DC
- -10-10 Vdc
- 1-5 Vdc
- 4-20 mA DC
Output Format
- Relay Contact - Signal Typical for Alarm Output
Power Supply
- 100-240 Vac/dc (-15%, 10%) 50/60 Hz - Power Supply Input & Rated Voltage
- 15-30 Vdc (± 20%) - Power Supply Input & Rated Voltage
Power Supply Effect
- ± 0.1% or less of Span for Fluctuation of 85-264 Vac/dc (47 to 63 Hz) & 12-36 Vdc - Effect of Power Supply Voltage Fluctuation
Relay Output
- 2 Relay Contacts - Alarm Output
Resistance
- 0 to 1,000 ohms - Factory Setting of Input Range
- 1 ohm or less - Output Resistance
- 100 ohms or less - Output Resistance
- 100 to 10,000 ohms - Full Resistance of Measuring Range
- 350 to 250,000 ohms - Permissible Load Resistance
- 500 KiloOhms or more - Output Resistance
Resolution
- 0.1%, 4 Significant Digits - Setting Resolution
- 1 second - Setting Resolution
Response Time
- 150 milliseconds, 63% Response (10 to 90%)
- 350 milliseconds (Input Change 10 to 90%, Alarm Setting Point 50%) - Alarm Output
Span & Zero Adjustments
- ± 10% of Span - Output Span Adjustment
- ± 5% - Output Zero Adjustment
- ± 5% of Span (Output-1 Signal: -10-10 Vdc) - Output Span Adjustment
Supply Voltage
- 1,000 Vac/minute between Output 1, Output-2 & Input, Output-2 when Alarm Output - withstand Voltage
- 12-36 Vdc - Power Supply Voltage Fluctuation
- 2,000 Vac/minute between Input, Output-1, Output-2, Power Supply & Ground Mutually - withstand Voltage
- 85-264 Vac/dc (47 to 63 Hz) - Power Supply Voltage Fluctuation
Temperature Effect
- ± 0.2% or less of Span for Change of 10° C (18° F) - Effect of Ambient Temperature
Temperature Range
- 0° to 50° C (32° to 122° F)
Version / Leadwires
- 3-Wire Typical (Potentiometer)
Zero Offset
- 50% of Full Resistance or less - Zero Elevation
