Num'axes NGPIEACC038 User Manual

The Num'axes NGPIEACC038 is a high-precision industrial-grade piezo-electric accelerometer designed for vibration monitoring and condition-based maintenance applications. It features a wide frequency range, high sensitivity, robust IP67-rated housing, integrated electronics (IEPE), 4-20mA output, and operates on a standard 18-30V DC loop power supply. Below are key sections for safety, features, installation, configuration, operation, and troubleshooting.

Features at a Glance

Key components: Piezo-electric sensing element, Stainless Steel housing, Integrated IEPE electronics, 2-pin M12 connector, Mounting stud.

Installation

Unpack and inspect contents. Ensure mounting surface is clean and flat.

1. Mount the sensor: Use the provided M5 stud or high-strength adhesive. Ensure axis alignment is correct.
2. Connect cable: Attach the M12 female connector to the sensor, ensuring proper seal.
3. Route cable: Secure cable away from moving parts and high-temperature sources.
4. Connect to power/readout: Connect the other end to a compatible IEPE power supply/conditioner or PLC/DCS analog input.

WARNING! Sensor is sensitive to mounting torque. Do not exceed 2 Nm. Ensure all connections are secure and shielded.

First-Time Setup

Apply power; verify signal output.

1. Power up: Apply 24V DC constant current power (typically 4 mA) to the IEPE line.
2. Verify bias voltage: Measure DC bias at the output; should be typically 8-12V DC.
3. Check signal: Tap the sensor lightly; observe AC signal variation on an oscilloscope or meter.
4. Configure system: Set your data acquisition system or PLC for the correct input range (e.g., 0-5V or 4-20mA) based on your model.

CAUTION! Do not apply voltage outside 18-30V DC. Reverse polarity may damage the electronics.

Specifications

• Model: NGPIEACC038.
• Measurement Range: ±50 g peak.
• Non-Linearity: < ±1% FS.
• Resonant Frequency: > 25 kHz.
• Transverse Sensitivity: < 5%.
• Output Impedance: < 100 Ω.
• Discharge Time Constant: > 1 second.
• Electrical Isolation: Case isolated from signal ground.
• Ingress Protection: IP67.
• Cable: Shielded, polyurethane, 5 meters standard.

Controls and Settings

The sensor has no user controls. All configuration is done at the system interface (PLC, DCS, DAQ).

System Interface Parameters to Set: Input type (IEPE Voltage or 4-20mA), Measurement range (e.g., 0-50 g), Sampling rate, High-pass/Low-pass filter settings if available.

For 4-20mA output models: Scale the current loop (4mA = 0 g, 20mA = +50 g). Ensure loop power supply is within 18-30V DC and can drive the loop resistance.

Connecting to Systems

IEPE to Data Acquisition: Use 2-core shielded cable. Connect signal+ and power/shield- to IEPE input. 4-20mA to PLC: Connect in series with 24V DC supply and analog input channel.

1. Turn off system power before connecting.
2. Use correct mating M12 connector (A-coded, 2-pin).
3. Maintain shield connection at the system end only to avoid ground loops.
4. For long cable runs (>30m), consider using a signal conditioner.

Tip: Label all cables for easy identification during maintenance.

Operation & Monitoring

Designed for continuous vibration monitoring.

1. Normal Operation: The sensor continuously outputs a voltage/current proportional to acceleration.
2. Data Interpretation: High RMS values indicate increased vibration. Monitor peak and frequency spectrum for fault diagnosis.
3. Trending: Record vibration levels over time to establish a baseline and detect deviations.
4. Alarm Setting: Configure alarms in your monitoring system based on velocity (mm/s) or acceleration (g) thresholds.

WARNING! Do not subject the sensor to shocks exceeding its ±50 g range. Avoid exposure to strong electromagnetic fields.

Diagnostic Features

Bias Voltage Check: A significant drop in DC bias voltage (e.g., below 5V) may indicate a faulty sensor or cable. Open/Short Circuit Detection: Most IEPE supplies can detect cable faults. System Integration: Can be integrated with predictive maintenance software for FFT analysis and fault forecasting.

Maintenance & Cleaning

Periodically inspect mounting integrity and cable condition. Clean exterior with a soft, dry cloth. For oily environments, use a cloth dampened with isopropyl alcohol.

CAUTION! Do not immerse the connector in liquid. Do not use abrasive cleaners or high-pressure sprays.

Regulatory Information

Complies with CE directives for EMC and RoHS. Manufactured under ISO 9001:2015 quality standards. For hazardous area use, consult specific model certifications (ATEX, IECEx if applicable). Copyright © 2025 Num'axes Instruments; trademarks of Num'axes GmbH. For technical support, visit www.numaxes-instruments.com/support or contact +49 (0)30 12345678.

Troubleshooting

Calibration: Recommended annually at an accredited lab for critical applications.

Service: +49 (0)30 12345678; [email protected]