Introduction to DEIF DLQ144-PC-NB
Product Description
The DEIF DLQ144-PC-NB is a high-performance data logger and quality analyzer designed for power systems, focusing on monitoring and recording electrical parameters to ensure grid compliance and system reliability. As part of DEIF’s portfolio of energy management solutions, this device is engineered to capture, store, and analyze critical power quality data in applications such as utility substations, industrial plants, renewable energy farms, and commercial buildings with strict power quality requirements.
The “DLQ144-PC-NB” designation highlights its core capabilities: “DLQ” (Data Logger and Quality analyzer) indicates its dual focus on data logging and power quality analysis, “144” refers to its 144-hour continuous logging capacity at maximum sampling rate, “PC” denotes compatibility with PC-based configuration software, and “NB” signifies a network-enabled base model with communication features. Unlike basic data loggers, the DLQ144-PC-NB offers advanced power quality metrics (e.g., harmonics, flicker, voltage sags) and long-term storage, making it invaluable for troubleshooting, compliance reporting, and preventive maintenance in power systems.
Technical Parameters
- Power Supply: 100-240V AC (50/60Hz) or 24V DC (18-32V DC)
- Power Consumption: ≤15W (typical); ≤20W (with all interfaces active)
- Measurement Channels:
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- Voltage: 3-phase (L-L or L-N) up to 690V AC; accuracy ±0.1% of reading
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- Current: 3-phase via CTs (5A/1A secondary); accuracy ±0.2% of reading
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- Frequency: 45-65Hz; accuracy ±0.001Hz
- Power Quality Metrics:
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- Harmonics: Up to 50th order (voltage and current)
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- Flicker: Pst, Plt (IEC 61000-4-15 compliant)
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- Transients: Voltage sags/swells (IEC 61000-4-30 Class A)
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- Unbalance: Voltage/current unbalance factor (≤0.1%)
- Data Logging:
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- Storage: 32GB internal memory (expandable via SD card)
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- Sampling Rates: 10Hz to 1kHz (configurable)
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- Logging Duration: Up to 144 hours at 1kHz; 1 year at 10Hz
- Communication Interfaces:
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- Ethernet (Modbus TCP/IP, FTP for data transfer)
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- RS485 (Modbus RTU)
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- USB (for local configuration and data export)
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- Optional 4G/LTE for remote data access
- Operating Temperature: -20°C to +60°C (-4°F to +140°F)
- Storage Temperature: -40°C to +70°C (-40°F to +158°F)
- Relative Humidity: 5-95% RH (non-condensing)
- Protection Rating: IP40 (front panel); IP20 (rear connections)
- Dimensions: 144mm × 144mm × 110mm (W × H × D)
- Weight: Approximately 1.2kg
- Certifications: IEC 61000-4-30, CE, UL 61010, ISO 9001
Usage Methods
- Installation:
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- Mount the unit on a DIN rail or panel in a control cabinet, ensuring vertical orientation for heat dissipation.
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- Position near the main distribution panel to minimize cable length for voltage and current measurements.
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- Avoid locations with strong electromagnetic fields (e.g., transformers, motor drives) to prevent measurement interference.
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- Allow 20mm clearance around the device for ventilation and wiring access.
- Wiring and Connection:
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- Connect voltage inputs to the main supply via fused terminals, ensuring correct phase sequence (L1, L2, L3, N).
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- Wire current transformers (CTs) to the current inputs, matching polarity markings to ensure accurate phase measurements.
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- Connect Ethernet or RS485 cables for communication, using shielded twisted-pair cable with shields grounded at both ends.
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- Power the unit with 100-240V AC or 24V DC, using a dedicated circuit with overcurrent protection (1A).
- Configuration:
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- Use DEIF’s PowerLog software to configure measurement parameters (e.g., voltage range, CT ratio) and logging settings.
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- Set up power quality thresholds (e.g., sag duration >10ms, harmonics >5%) to trigger event-based logging.
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- Configure communication protocols (IP address, Modbus registers) for integration with SCADA or power management systems.
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- Calibrate the device annually using a traceable reference standard to maintain measurement accuracy.
- Operation and Maintenance:
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- Monitor real-time data via the front-panel LCD or PowerLog software, checking for power quality events (e.g., voltage sags).
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- Export logged data periodically via USB or FTP for analysis, generating compliance reports (e.g., EN 50160 for grid quality).
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- Inspect wiring connections quarterly for tightness, especially in high-vibration environments.
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- Clean the LCD and ventilation slots with a soft cloth to remove dust; avoid using chemical cleaners.
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- Replace the internal battery (CR2032) every 5 years to maintain timekeeping during power outages.
System Introduction
The DEIF DLQ144-PC-NB operates as a critical power quality monitoring hub, integrating four key functions:
- Measurement Layer: Uses high-precision ADCs to capture voltage, current, and frequency data, converting analog signals to digital format for processing.
- Analysis Layer: Computes power quality metrics (harmonics, flicker, transients) in real time, comparing them against IEC standards to identify anomalies.
- Storage Layer: Logs continuous and event-triggered data to internal memory, ensuring historical records for troubleshooting and compliance.
- Reporting Layer: Generates standardized reports (PDF, CSV) via software, enabling engineers to analyze trends and address power quality issues.
In a renewable energy plant, the DLQ144-PC-NB monitors the connection point between solar inverters and the grid. It logs harmonics generated by inverters, ensuring compliance with grid codes (e.g., <5% total harmonic distortion). When a voltage sag occurs due to a grid fault, the device triggers event logging, capturing pre- and post-fault data to help diagnose the cause and prevent future disruptions.
Related Models in the Series
- DEIF DLQ144-PC-PRO: Professional version with advanced analysis (up to 100th harmonic) and real-time waveform capture, ideal for utility substations.
- DEIF DLQ144-PC-EX: Explosion-proof variant (ATEX/IECEx Zone 2) for hazardous areas like oil refineries or chemical plants.
- DEIF DLQ96-PC-NB: Compact 96mm-wide model with reduced I/O, suitable for space-constrained applications (e.g., commercial buildings).
- DEIF DLQ144-WB-NB: Wireless model with integrated LoRaWAN, eliminating wiring in remote locations (e.g., wind farms).
- DEIF DLQ144-PC-ETH: Enhanced Ethernet model with PoE (Power over Ethernet) and web-based monitoring, simplifying network integration.
- DEIF DLQ200-PC-NB: High-capacity version with 128GB memory and 2kHz sampling rate, designed for high-voltage transmission systems.
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