Introduction to DEIF PPU/2/GS
Product Description
The DEIF PPU/2/GS is a compact yet robust power protection unit designed for generator sets and small-scale power systems, focusing on reliable monitoring and protection of electrical assets. Manufactured by DEIF, a pioneer in energy management solutions, this unit is engineered to safeguard generators, transformers, and distribution panels against electrical faults, ensuring operational continuity in applications such as small industrial facilities, commercial buildings, backup power systems, and remote off-grid installations.
Featuring a streamlined design with essential protection functions, the PPU/2/GS balances simplicity and performance, making it ideal for systems where complex control is unnecessary but reliable fault detection is critical. Its “2/GS” designation highlights key attributes: support for 2 main electrical sources (typically a generator and a utility grid) and optimized functionality for generator set (GS) integration. The unit combines real-time measurement capabilities with configurable protection relays, enabling quick response to overcurrent, voltage anomalies, and frequency deviations—all packaged in a durable enclosure suitable for harsh environments.
Technical Parameters
- Power Supply: 24V DC (20-30V DC)
- Power Consumption: ≤5W (standby); ≤8W (active with alarms)
- Measurement Inputs:
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- Voltage: 2 three-phase AC inputs (up to 440V AC L-L)
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- Current: 2 three-phase CT inputs (5A secondary)
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- Frequency: 50/60Hz (auto-detection, ±2Hz range)
- Protection Functions:
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- Overcurrent (50-500% of rated current, adjustable)
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- Overvoltage (105-120% of nominal, adjustable)
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- Undervoltage (80-95% of nominal, adjustable)
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- Overfrequency (51-55Hz/61-65Hz, adjustable)
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- Underfrequency (45-49Hz/55-59Hz, adjustable)
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- Earth fault (residual current detection)
- Output Relays: 4 SPDT relays (5A/250V AC) for alarm and control
- Communication Interface: RS485 (Modbus RTU) for remote monitoring
- Response Time: ≤100ms for critical faults (e.g., short circuit)
- Accuracy:
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- Voltage: ±1% of reading
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- Current: ±2% of reading
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- Frequency: ±0.1Hz
- Operating Temperature: -25°C to +70°C (-13°F to +158°F)
- Storage Temperature: -40°C to +85°C (-40°F to +185°F)
- Relative Humidity: 5-95% RH (non-condensing)
- Vibration Resistance: 10-500Hz, 5g peak (IEC 60068-2-6)
- Protection Rating: IP40 (front panel); IP20 (terminal block)
- Dimensions: 144mm × 144mm × 100mm (W × H × D)
- Weight: Approximately 0.8kg
- Certifications: IEC 61010, CE, UL 508
Usage Methods
- Installation:
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- Mount the unit on a DIN rail or panel using the integrated brackets, ensuring vertical placement for heat dissipation.
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- Position in a control cabinet away from direct sunlight, moisture, and high-voltage cables to minimize interference.
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- Allow 20mm clearance around the unit for wiring access and ventilation.
- Wiring and Connection:
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- Connect voltage inputs from the generator and grid to the dedicated terminals, ensuring correct phase sequence (L1, L2, L3).
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- Wire current transformers (CTs) to the current inputs, matching the primary current rating of the system (e.g., 100A/5A CTs for 100A circuits).
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- Connect relay outputs to alarm devices (sirens, beacons) or control elements (circuit breakers, generator shutdowns) based on protection logic.
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- Establish RS485 communication by connecting to a PLC or SCADA system using twisted-pair shielded cable (ground shield at both ends).
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- Power the unit with a 24V DC supply, using a fused circuit (0.5A) to prevent overcurrent damage.
- Configuration:
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- Use DEIF’s PPU Config Tool software (via RS485) to set protection thresholds, such as overvoltage limits and overcurrent trip times.
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- Configure relay logic to map specific faults to outputs (e.g., overcurrent → trip breaker, undervoltage → sound alarm).
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- Calibrate voltage and current measurements using a reference meter to ensure accuracy.
- Operation and Maintenance:
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- Monitor status via front-panel LEDs (power, normal, alarm) or remote software; red alarm LED indicates active faults.
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- Test protection functions monthly by simulating faults (e.g., applying overvoltage) to verify relay activation.
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- Inspect wiring quarterly for tightness and corrosion, especially in humid environments.
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- Clean the unit annually with compressed air to remove dust from ventilation slots.
System Introduction
The DEIF PPU/2/GS serves as a critical protective barrier in small power systems, integrating three core functions:
- Monitoring Layer: Continuously measures voltage, current, and frequency from the generator and grid, converting analog signals to digital data for analysis.
- Protection Layer: Compares real-time data against user-defined thresholds, triggering relays to isolate faults (e.g., tripping a breaker) or alert operators when anomalies occur.
- Communication Layer: Transmits status updates and fault records via Modbus RTU, enabling remote monitoring and historical trending.
In a commercial building backup system, the PPU/2/GS monitors a 50kVA generator and the utility grid. During a grid outage, it detects underfrequency (47Hz) and signals the generator to start. If the generator experiences overvoltage (460V on a 400V system), the unit activates a relay to shut down the generator, preventing damage to connected equipment like HVAC systems and lighting.
Related Models in the Series
- DEIF PPU/3/GS: 3-source protection unit, supporting two generators and a grid, ideal for facilities with redundant backup systems.
- DEIF PPU/2/GS-EX: Explosion-proof variant (ATEX/IECEx certified) for hazardous areas, such as petrochemical storage facilities.
- DEIF PPU/2/GS-W: Wireless-enabled model with LoRa connectivity, eliminating wiring for remote sites like telecom towers.
- DEIF PPU/2/GS-LV: Low-voltage optimized version (110V AC input) for residential or light commercial applications.
- DEIF PPU/2/GS-ADV: Advanced model with additional protection (e.g., reverse power, thermal overload) and Ethernet communication.
- DEIF PPU/1/GS: Single-source unit for standalone generators, offering cost-effective protection for small off-grid setups.
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