Danfoss harvester NFPE electric proportional non-feedback displacement control pump
Danfoss NFPE Non-Feedback Proportional Electric Displacement Control Pump for Harvesters
1. Product Overview
The Danfoss NFPE pump is a high-performance non-feedback proportional electric displacement control pump specifically engineered for harvester applications. As a core component of the electro-hydraulic drive system, it integrates advanced proportional control technology and reliable hydraulic transmission performance, providing precise, efficient and stable power output for various harvesting operations. Designed to meet the rigorous working conditions of agricultural harvesting, this pump effectively adapts to the dynamic load changes during harvester operation, ensuring optimal coordination between the engine and the hydraulic system.
2. Core Features
- Non-Feedback Proportional Electric Control: The pump displacement is proportional to the solenoid signal current, enabling stepless adjustment of output flow to achieve precise control of harvester travel speed and working mechanism actions.
- Manual Override Function: Equipped with a manual override mechanism (MOR) that allows manual control of the pump in case of electrical system failures, ensuring continuous operation of the harvester and improving operational reliability.
- Dual Voltage Options: Available in 12V (Option A8) and 24V (Option B8) configurations to match different harvester electrical system specifications, enhancing versatility.
- Engine Protection: Effectively prevents engine stalling caused by insufficient power by intelligently adjusting pump displacement according to load changes, optimizing power utilization.
- Compact and Reliable Design: Adopts a one-piece swash plate structure and optimized hydraulic circuit design, featuring minimized control losses, improved charge circuit efficiency, and lower power consumption. The standardized connector interface facilitates installation and maintenance.
- Multiple Control Functions: Supports independent profiling and ramping of pumps and hydraulic motors for forward and reverse directions, with functions such as electric drive pedal connection, electronic inching, and electric creep mode, meeting diverse operational requirements of harvesters.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Control Type | Non-Feedback Proportional Electric (NFPE) |
| Supply Voltage | 12V DC (Option A8) / 24V DC (Option B8) |
| Maximum System Pressure | Up to 450 bar (6527 psi) [Depends on specific model] |
| Displacement Range | 28 – 180 cc/rev [Covers Series 42, H1P series models] |
| Input Speed Range | Minimum: 500 rpm; Rated: 3400 rpm; Maximum: 3500 rpm [Typical values, subject to model] |
| Control Response Time | 0.8 mm (Slow mode, for specific models) |
| Case Pressure | Rated: 3.0 bar (44.0 psi); Maximum: 5.0 bar (73.0 psi) |
| Charge Pressure Setting | Typically 20 bar (290 psi) [Adjustable based on application] |
| Compatibility | PLUS+1® Compliant, compatible with Danfoss PLUS+1® control system and diagnostic tools |
4. Application Advantages in Harvesters
When applied in harvesters (such as tomato harvesters, grain harvesters, etc.), the Danfoss NFPE pump forms a high-performance drive system with two-speed gearboxes and H1B series bent-axis motors, providing sufficient power for the harvester’s travel and working mechanisms. Its key application advantages include:
- Precise Speed Control: Realizes stepless adjustment of harvester travel speed, adapting to different harvesting speeds required by various crops and field conditions.
- Efficient Power Matching: Optimizes the matching between the engine and hydraulic system, reducing fuel consumption while ensuring harvesting efficiency, achieving energy-saving effects.
- Stable Operation: Effectively copes with sudden load changes during harvesting (such as uneven crop density, terrain changes), maintaining stable operation of the harvester and improving harvesting quality.
- Simplified System Design: Integrates multiple control functions, reducing the number of hydraulic components and pipelines, simplifying the harvester’s hydraulic system structure, and lowering maintenance costs.
5. Installation and Maintenance Notes
- Mounting Requirements: For multi-pump combinations, arrange the pump with the highest power flow close to the input source. Use clamp-type couplings for applications with radial shaft loads to extend bearing life.
- Fluid Specifications: Use hydraulic oil that meets Danfoss requirements. Ensure proper filtration of the hydraulic system to prevent contamination and damage to the pump’s internal components.
- Calibration and Debugging: Utilize Danfoss PLUS+1® GUIDE software for function block configuration and calibration, including setting threshold current, end current, etc., to ensure optimal control performance.
- Fault Monitoring: Connect the feedback signals (Fdbk_A, Fdbk_B) to the output bus for real-time monitoring of system faults. Regularly check the pump’s case pressure, temperature, and oil quality to prevent potential failures.
6. Compliance and Documentation
The NFPE pump complies with international agricultural machinery standards and is supported by comprehensive technical documentation, including user manuals, technical specifications, hydraulic schematics, and PLUS+1® function block configuration guides. For the latest technical literature and detailed parameters, please visit the official Danfoss website (www.klhyd.com) or contact local Danfoss representatives.
