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Solar Pumping Solutions – SD750SP Series

Power Electronics is strongly committed to reducing the Levelized Cost of Water (LCoW) by delivering advanced energy-saving solutions. The synergy between our Industrial and Solar Divisions has resulted in the development of the SD750SP Solar Power series, a versatile and innovative approach to solar pumping.

Solar-Assisted Operation

The SD750SP can be connected simultaneously to both the mains (AC) and the PV field (DC). The AC input voltage determines the DC bus voltage of the SD750SP, which in turn sets the required DC string voltage. The maximum energy harvested at a fixed DC voltage is defined by the number of PV panels connected in series, allowing for flexible system design and optimization.

Self-Sufficient Solar Operation

In fully off-grid mode, the SD750SP operates exclusively from the PV field, generating the necessary power to start and drive the pump. The minimum required power depends on the hydraulic response of the complete pump and load system.

Customized for Solar and Hybrid Supply

The SD750SP is a customized version of the SD750 VSD, designed with an extended DC input range, making it suitable for AC, DC, or hybrid operation. It features enhanced firmware with integrated Maximum Power Point Tracking (MPPT) to optimize performance under varying solar conditions.

Optional Solar Kits and Engineering Support

Optional Solar Kits are available, including diodes, DC protections, disconnection devices, and filtering components, for a complete and safe solar pumping solution. Additionally, our engineering and consulting department offers full support for PV sizing and SD750SP selection, ensuring the best system configuration.

A fully integrated cabinet solution is also available, enabling easy installation and commissioning in a compact and efficient setup.

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Optimal Efficiency and Control

Our Active Front End (AFE) technology guarantees maximum efficiency and precise control by actively managing harmonics and ensuring stable drive voltage. This sets a new standard for power quality and system reliability in demanding industrial environments.

Energy Regeneration – 4-Quadrant Operation

Designed for full 4-quadrant operation, our regenerative VFD recovers braking energy and seamlessly feeds it back into the grid. This energy-efficient solution improves overall system performance while reducing operating costs — a key step toward sustainable, greener energy use.

Ultra-Low Harmonics – THDi < 5%

Leveraging cutting-edge AFE technology, our drives deliver:

• Braking energy regeneration.
• THDi below 5%, significantly reducing harmonic distortion.
• Automatic power factor correction (cos φ), maintaining unity power factor under all load conditions.
• Stable motor voltage, even under severe input voltage fluctuations.

All harmonic levels comply with IEEE 519 standards for all ISC/IL ratios, ensuring clean and stable power supply to sensitive equipment.

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Compact and Powerful

The SD750 Kompakt series retains all the advanced features of the SD family while reducing size by up to 2.5 times, making it the ideal solution when space is at a premium, with power density up to 2200 kW.

Space-Saving Design

Specifically designed for applications where space optimization is critical, the SD750 Kompakt offers a compact footprint without compromising performance.

Flexible Mounting – IP00 and IP20 Options

Inspired by contactor wiring concepts, the unit features top power input and bottom motor output connections, streamlining installation. The drive unit and input chokes are delivered as a set with IP00 protection, with IP20 options available for added versatility.

Integrated dV/dt Filter

Equipped with a built-in dV/dt filter (500V/μs–800V/μs), the SD750 Kompakt allows safe installation with up to 300 meters of unshielded cable, fully aligned with Power Electronics’ recommendations.

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Wide Range and High Flexibility

The SD750 series forms the core platform of our product line, available from 1.5 kW to 1750 kW and for voltages between 380 V AC and 480 V AC. Offered in IP20 and IP54 enclosures, it covers the full spectrum of industrial applications, combining compact design with easy installation, commissioning, and maintenance, making it one of our most extensive and versatile ranges.

Key Features and Advanced Capabilities

• Low dV/dt to protect motor insulation and extend lifespan.
• Smart mechanical design for higher power density and space-saving installation.
• Advanced motor control algorithms for precision and efficiency.
• Removable memory unit for simple and advanced maintenance.
• Energy monitoring and analysis tools to support energy-saving processes and digital transformation initiatives.

User Interface and Control Panel

The SD750 series features an intuitive control panel with integrated WiFi connectivity, enabling simultaneous connection to multiple drives and user-friendly interaction without additional hardware.

Accessories and Customization Options

• Communication Modules & Interface Components:
  A wide range of communication options including Modbus, Profibus, Profinet, Ethernet/IP, and others, designed to meet specific industrial requirements.

• Fiber-Optic Circuit Board:
  Allows fiber-optic communication for synchronizing multiple drives in master/slave configuration (PMC – Power Motor Control), enabling coordinated control of speed or torque. Fiber optics ensure interference-free communication over long distances.

• I/O Expansion Cards:
  Optional digital and analog I/O expansion cards to integrate SD750 into any system.
  (Note: If the same card offers both analog and digital I/O, the phrase “or” would be removed for consistency.)

• Encoder Card:
  For closed-loop vector control, enhancing control accuracy. Supports differential encoders with optically isolated signals and supply voltages from 5VDC to 24VDC.

• PT100 Input Expansion:
  Enables connection of up to 8 PT100 sensors for monitoring motor or process temperatures.

• IP20 Junction Boxes:
  Optional junction boxes (sizes 1 and 3) to facilitate cable connections and compliance with installation standards regarding cable bend radius.

Mechanical and Installation Options

• Platforms and Mounting Solutions:

  • Sizes 5 and above: Floor-mounted design; optional platforms to reach total heights of 2000 mm or 2200 mm.
  • Size 4: Wall-mounted design, also adaptable to floor platforms with total height of 1712 mm.

• Paint Finishes:
  Available with special paint coatings for specific environmental requirements.

Advanced Safety and Protection

• B150 Dynamic Brake:
  Activates the IGBT when the DC bus voltage exceeds set limits, dissipating energy through external resistors for safe operation.

• Special Filters:
  Custom input and output filters, including sinusoidal filters, IT system filters, and filters for harsh environments. Contact Power Electronics for tailored solutions.

• Functional Safety Options:
  Including PT100 temperature sensors, safety cut-offs, and emergency stop systems to meet application-specific safety standards.

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SD700SP Series – High Power Solar Pumping VSD

Unique High-Power Solar Pumping Solution

Overview

The SD700SP Variable Speed Drive is a dedicated high-power solar pumping solution, designed to reduce the Levelized Cost of Water (LCoW) through advanced energy-saving technologies. Developed through the synergy of Power Electronics’ Industrial and Solar Divisions, the SD700SP combines the versatility and robustness of the SD700 VSD with innovative solar pumping features.

SD700SP is capable of powering pumping systems directly from solar PV panels (off-grid) or through hybrid operation (solar PV assisted by grid supply), offering unmatched flexibility in water management.

Key Features & Benefits

• Dual operation modes:
  • Solar off-grid operation directly from PV panels
  • PV-assisted grid mode for seamless transition between PV and grid supply
• Compact, fully factory-approved system, ready for easy integration
• Includes:
  • Customized SD700 VSD
  • DC protections and disconnection units
  • Filtering and upgraded firmware for solar-specific operation
• Easy installation and commissioning, minimizing setup time and complexity
• Fully engineered solution, backed by Power Electronics’ technical team, providing application-specific studies, including:
  • Pump curve analysis
  • Static head and minimum flow calculations
  • PV sizing support

Energy and Cost Efficiency

• Significantly reduce your Levelized Cost of Water (LCoW) by using a reliable, solar-based pumping system
• Optimized to maximize solar energy use, while maintaining system reliability and performance under all operating conditions

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SD700FR Series – Regenerative, Low Harmonic Variable Speed Drives

The Most Compact, Low Harmonic Regenerative VSD

Overview

The SD700FR Variable Speed Drive takes the renowned SD700 family to the next level, integrating active front end (AFE) technology while retaining all the advanced features of the series.

Engineered for maximum energy efficiency and performance, the SD700FR can:

• Reduce THDi to less than 5%
• Adjust and maintain a constant power factor (cos φ) under any load condition
• Stabilize motor voltage, even in the event of significant input voltage drops

As a regenerative 4-quadrant drive, SD700FR allows for energy recovery, reducing operational costs and enhancing system performance.

Key Features & Benefits

• Compact IP54 design, no dust filters required — reduced maintenance
• Operation at 50°C without power derating — reliable in high-temperature environments
• Full Frontal Access (FFA) for easy maintenance and serviceability
• Modular LCL filter and power stage for flexible and scalable configurations
• 4Q Regenerative Drive: recover and reuse braking energy
• Adjustable displacement power factor — maintains high power quality and efficiency
• Built-in RFI filter for EMC compliance
• Built-in dV/dt filter:
  • Voltage rise control 400V/μs–800V/μs, supporting unscreened motor cables up to 300 m
• Conformally coated electronics built to military and aerospace standards, ensuring durability in demanding environments

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SD700FL Series – Low Harmonic, Modular Variable Speed Drives with Notch Filter

Premium Low Harmonic and Modular Drive Solution

Overview

The SD700FL Variable Speed Drive enhances the advanced features of the SD700 family with an integrated input notch filter that reduces THDi to below 5%. This is achieved via parallel-connected filtering modules, fully controlled and monitored by the drive for optimized performance.

Each filtering module includes temperature sensors and a contactor that isolates the long-life capacitors when necessary. The contactor is automatically managed by the drive, adapting to motor load conditions, ensuring maximum efficiency and component protection.

Why Choose SD700FL?

• Grid-independent filtering performance:
  • Notch filter operation does not depend on grid impedance, eliminating risks of resonance often associated with passive filters.
  • Consistent low harmonic performance, even if electrical grid conditions change, making it suitable for any low harmonic application.

Key Features & Benefits

• IP54 protection without dust filters for reduced maintenance
• Operation at 50°C without power derating for reliable performance in harsh environments
• Full Frontal Access (FFA) design for easy maintenance and inspection
• Modular power stage and notch filter for flexible and scalable solutions
• Built-in RFI filter for electromagnetic compatibility
• Built-in dV/dt filter:
  • Limits voltage rise to 400V/μs–800V/μs, allowing the use of screened motor cables up to 300 m
• Conformally coated electronics:
  • Built to military and aerospace standards for enhanced durability in demanding environments

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SD700K Compact Series – High-Performance Variable Speed Drives in a Compact Form

Maximum Performance in Minimum Space

Overview

The SD700K Compact Series delivers the advanced features of the SD700 family in a space-saving design, with power density up to 800 kW/m³. This makes it the ideal solution for projects where space constraints are critical.
Reducing its size by up to 2.5 times, SD700K offers professional project engineers greater flexibility and competitiveness when designing and executing electrical installations.

Designed with a top input power and bottom motor output connection, following the contactor wiring concept, it is supplied in two IP00 units (drive unit and input chokes), making it easy to install in custom cabinets or technical rooms according to Power Electronics guidelines.

Key Features & Benefits

• Power range: 63 kW to 800 kW
  • The ideal solution where multiple motors are installed, offering significant space savings.
• High power density: Up to 800 kW/m³ — maximum performance in compact size.
• Wide voltage range:
  • 230 V AC, 380–500 V AC, 525 V AC, 690 V AC
  • Designed for weak grids and variable voltage operations, ensuring continuous performance even under fluctuating conditions.
• Optional IP20 protection available via dedicated enclosures for technical room integration.
• 12-pulse option to reduce Total Harmonic Distortion (THD) without increasing space requirements.
• External input chokes (3% impedance) included to filter grid anomalies, preserving the drive’s performance and reducing THD.
• Standard EMC input filter for minimizing electromagnetic interference.
• External braking units:
  • B150 braking unit dissipates regenerated energy during braking cycles, ensuring smooth operation.

Installation Flexibility

• Delivered in two components (IP00): drive unit and input chokes, enabling custom cabinet installation.
• Designed for easy integration in space-restricted technical rooms or specialized enclosures.