The Toshiba XJMS-1131A is a high-reliability industrial power transducer designed to accurately measure and convert reactive power (VAR) into a proportional DC electrical signal for monitoring and control systems.
Product Parameters (Datasheet)
- Model Number: XJMS-1131A
- Measurement Type: Reactive Power (VAR)
- Input Voltage (Un): 110V AC
- Frequency: 50/60 Hz (Dual compatible)
- Input Current (In): Typically 5A (Standard CT secondary)
- Output Signal: Proportional DC signal (e.g., 4-20mA or 0-1mA, model dependent)
- Accuracy Class: 0.5% or 1.0% (Industrial Grade)
- Auxiliary Power: Self-powered from the measuring voltage or external 110V AC
- Isolation: High-voltage isolation between input, output, and power supply circuits
- Casing: Robust industrial-grade DIN-rail or surface mount housing
Country of Origin
This precision measurement instrument is manufactured by Toshiba Corporation in Japan, adhering to strict Japanese Industrial Standards (JIS) for electrical metering.
Application Fields
The XJMS-1131A is essential for power quality management in various sectors:
- Power Substation Monitoring: Measuring reactive power flow to manage grid stability.
- Industrial Plants: Monitoring large inductive loads like motors and transformers to optimize power factor.
- Energy Management Systems (EMS): Providing data for automated capacitor bank switching.
- Co-generation Plants: Balancing VAR exchange between local generators and the public utility grid.
- Switchboard Manufacturing: Integrated into control panels for real-time electrical telemetry.
Product Usage Instructions
- Mounting: Install the transducer in a clean, dry environment, preferably within an IP-rated electrical enclosure.
- Voltage Connection: Connect the 110V AC sensing lines to the designated voltage input terminals. Ensure proper fusing (typically 1A or 2A) for protection.
- Current Connection: Connect the secondary leads of your Current Transformers (CTs) to the current input terminals. Warning: Never open-circuit a live CT secondary.
- Output Wiring: Connect the DC output terminals to your PLC, DCS, or analog meter. Use shielded twisted-pair cabling to prevent EMI interference.
- Calibration: While factory-calibrated, zero and span adjustments may be available via recessed potentiometers for periodic field verification.
Product Technical Description
The XJMS-1131A utilizes an internal multiplier circuit to calculate the instantaneous product of voltage and current, specifically shifting the phase by 180°C to isolate the reactive component (VAR). This calculation is then smoothed and converted through an isolation transformer into a stable DC output. This “galvanic isolation” is critical as it protects sensitive control equipment (like PLCs) from high-voltage surges on the primary power lines. Its solid-state design ensures a much longer service life and higher vibration resistance compared to older electro-mechanical VAR meters.
Q&A (Common Questions)
Q: Can this transducer measure “Leading” and “Lagging” VAR? A: Yes, most XJMS series transducers are designed for bi-directional measurement, providing a center-zero or offset-scale output to indicate the direction of reactive power.
Q: Is it okay to use this on a 440V system? A: No, the input is rated for 110V AC. You must use a Potential Transformer (PT) to step down the system voltage to 110V before connecting to this device.
Q: Does it require a separate power supply? A: This model is typically “self-powered” from the 110V AC measurement input, meaning it does not require an additional auxiliary DC power source to function.
Q: How often should the unit be recalibrated? A: For critical utility billing or safety applications, annual calibration is recommended. For general industrial monitoring, a check every 2-3 years is usually sufficient.
Similar Model Recommendations
- Toshiba XJMS-1131B (Different output signal variant)
- Toshiba XJMS-2131A (3-phase measurement version)
- Toshiba XJWS-1131A (Watt/Active Power version)
- Yokogawa 2469 (Equivalent industrial VAR transducer)
- Toshiba VPL-series (Modern digital multi-transducer)
For technical specifications or to request a quote for the Toshiba XJMS-1131A, please contact our sales team.
