The MEIYO MFT-06 (Model 804) is a high-reliability industrial frequency converter designed for signal conditioning and processing in automated control systems. It is primarily used to convert variable frequency signals from sensors—such as tachometers, flow meters, or speed sensors—into standardized analog signals (e.g., 4-20mA or 0-10V) or digital pulses. This ensures that field data can be accurately interpreted by PLCs and DCS units in complex industrial environments.
Technical Specifications and Datasheet
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Product Model: MFT-06 (804)
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Input Frequency Range: 0 Hz to 10 kHz (Customizable via internal jumpers)
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Output Signal: 4-20mA DC / 1-5V DC / Pulse Output
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Accuracy: ±0.1% of Full Scale
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Power Supply: 24V DC / 110V AC Options
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Response Time: < 100ms
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Dimensions: 96mm x 48mm x 110mm
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Weight: 0.42 kg
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Origin: Japan
Application Fields
The MFT-06 is a versatile component found in sectors requiring high-precision frequency monitoring:
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Marine Engineering: Monitoring propeller shaft speed and main engine RPM in propulsion control systems.
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Power Plants: Frequency stabilization and monitoring for turbine generators.
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Flow Control: Converting pulse signals from turbine flowmeters into 4-20mA loops for volume calculation.
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Paper & Steel Mills: Synchronizing the speed of multiple rollers to maintain consistent tension in the production line.
User Instructions
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Installation: Mount the module on a standard DIN rail or through a panel cutout. Ensure adequate ventilation space around the heat sinks if operating at high ambient temperatures.
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Input Wiring: Connect the frequency source (e.g., proximity switch or magnetic pickup) to the designated input terminals. Use twisted-pair shielded cables to minimize electromagnetic interference.
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Calibration: Use the “Zero” and “Span” potentiometers on the front panel to fine-tune the output. Apply a known minimum frequency for the zero adjustment and a maximum frequency for the span adjustment.
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Impedance Check: Ensure the load resistance of the receiving device (PLC/Controller) does not exceed 500 ohms for 4-20mA output modes.
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Grounding: Connect the “GND” terminal to the system’s common ground to ensure signal stability and prevent drift.
Q&A: Common Troubleshooting
Q: The output remains at 4mA regardless of the input frequency. What is wrong? A: First, check the input signal with an oscilloscope or frequency meter to ensure the sensor is actually pulsing. If the input is fine, verify that the input signal amplitude (Voltage peak-to-peak) meets the MFT-06’s minimum threshold requirements.
Q: Can this unit be used as a Motor VFD (Variable Frequency Drive)? A: No. The MFT-06 is a signal converter (Frequency-to-Analog), not a power drive. It processes low-power measurement signals and cannot be used to power or control the speed of an AC motor directly.
Q: How do I change the frequency range (e.g., from 1kHz to 5kHz)? A: Range changes usually require adjusting internal DIP switches or jumpers located inside the module casing. Refer to the specific wiring diagram on the side of the unit or the factory manual before opening the housing.
Similar Model Recommendations
For alternative signal conditioning or frequency processing needs, consider these models:
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MEIYO MFT-03: A more compact version for basic frequency-to-current conversion.
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YOKOGAWA VJF1: A high-performance plug-in type frequency-to-analog converter.
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ACROMAG 651T: Two-wire frequency-to-current transmitter for simplified wiring.
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DEIF TQ2: A specialized marine-grade frequency transducer for switchboard applications.
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M-SYSTEM M2VF: A versatile, narrow-profile frequency transmitter with high isolation.
