Grundfos CUE Variable Frequency Drive for Pump Speed Control
The Grundfos CUE is a sophisticated variable frequency drive engineered for effective speed control of any Grundfos pump without integrated drives, regardless of size or application. As an integral component of Grundfos iSOLUTIONS, the CUE combines simple installation with extensive control and monitoring capabilities, making it the ideal choice for water networks, wastewater systems, building services, and industrial pumping applications.
As an authorized Grundfos Water Pump Dealer in Dubai, we supply the complete CUE range with genuine warranty and technical support across the UAE.
Technical Specifications
| Parameter | Specification |
|---|---|
| Built-in I/O | Yes |
| Digital Inputs | 4 |
| Digital Inputs/Outputs | 2 |
| Relay Outputs | 2 |
| Analog Inputs | 1 dedicated for sensor, 1 dedicated for external setpoint |
| Analog Output | 1 |
| RS-485 Communication | GENIbus, Modbus RTU, and multi-pump |
Product Range by Power Supply
| Power Supply | Power Range |
|---|---|
| 1 × 200-240 V | 1.1–7.5 kW (1.5–10 HP) |
| 3 × 200-240 V | 0.75–45 kW (1–60 HP) |
| 3 × 380-500 V | 0.55–250 kW (0.75–350 HP) |
| 3 × 525-600 V | 0.75–90 kW (1–125 HP) |
| 3 × 525-690 V | 7.5–250 kW (10–350 HP) |
EMC Filter Classifications
The Grundfos CUE includes built-in EMC filters for conducted emission according to IEC61800-3 Ed. 2:
| Configuration | EMC Class | Application |
|---|---|---|
| CUE rated 500 V or lower up to 90 kW | Class C1 | Household application |
| CUE rated 500 V or lower above 110 kW | Class C2 | Industrial application |
| CUE rated 525 V or more (any power) | Class C3 | Industrial application |
Enclosure Variants
| Variant | Protection Rating | Installation Type |
|---|---|---|
| Standard | IP20/IP21/NEMA 1 | Cabinet installation |
| Wall Mount | IP55/NEMA 12 | Wall installation with mains disconnect |
All variants available with or without Safe Torque Off (STO) function.
Pre-Defined Control Modes
The Grundfos CUE provides application-specific control modes for simplified programming:
Constant Pressure – Maintains set pressure with or without stop function for water supply and boosting applications.
Proportional Differential Pressure – Adjusts pressure based on flow demand for HVAC circulation systems.
Constant Level – Maintains water level with or without stop function for tank filling and drainage applications.
Constant Temperature – Regulates temperature for heating and cooling system circulation.
Proportional Pressure – User-adjustable control curve compensates for system pressure losses.
Open Loop Control – Accepts external speed commands from BMS or SCADA systems.
Key Features & Benefits
Pump Family Settings A unique feature uses pre-programmed data for different Grundfos pump families. During installation, correct values are automatically set for specific pumps, ensuring optimum performance and protection.
Intuitive Start-Up Guide The comprehensive start-up wizard allows commissioning by simply entering pump type, motor type, control mode, sensor type, setpoint, and multi-pump mode. Grundfos CUE then automatically configures all necessary parameters.
Advanced HMI Panel Features The user interface includes a Favourites menu for quick adjustment of setpoint, operating mode, and control mode. The Main menu offers password-protected access for advanced commissioning and troubleshooting without additional tools. An Info key provides comprehensive descriptions for easy settings and status understanding—no manual required. Built-in logging enables performance tuning of the pump system.
Multi-Motor Compatibility Grundfos CUE operates with the most energy-efficient motor construction types: asynchronous induction motors, permanent magnet motors, synchronous reluctance motors, and PM-assisted SynRM. This flexibility ensures high pump system efficiency regardless of motor technology.
Energy Efficiency IE5-rated motor losses are over 30% lower than IE3-rated motors, reducing energy consumption by approximately 10% with typical pump load profiles. Speed-controlled pumps contribute to water-use efficiency (UN SDG 6) while high-efficiency motors reduce energy consumption (UN SDG 13).
Advanced Functionality
Multi-Pump Function Control parallel-coupled pumps without external controllers. Four multi-pump functions available: Alternating time, Back-up, and Cascade control with either fixed or variable speed assist pumps.
Differential Pressure Control Use two sensors instead of one differential sensor for running in differential pressure mode.
Proportional Pressure & Flow Estimation Proportional pressure control with user-adjustable control curve for pressure loss compensation.
Low Flow Stop Function Improved energy optimisation with easy configuration and high comfort during low-demand periods.
Dry Running Protection Protects the pump against failure due to dry running conditions.
Limit Exceed Function The pump reacts to measured or internal values exceeding user-defined limits by issuing alarm/warning or changing operating mode, reducing the need for external controllers.
Setpoint Influence Influence the controller setpoint using measured values for dynamic system response.
Standstill Heating (Anti-Condensation) Maintains motor windings at minimum temperature during standstill periods, heating both motor and terminal box to prevent condensation damage.
Water Network Features
Pipe Fill Mode Improves system reliability and prevents water hammering. Designed for both vertical and horizontal pipe systems to increase performance and prevent water hammer events.
Low Flow Stop Function Optimised energy consumption with easy configuration for water distribution systems.
Built-In Cascade Control Increased flow capacity through simple cascade control of up to two fixed-speed pumps, easily configured from the start-up guide.
Wastewater Network Features
High Overload & Constant Torque Constant torque characteristic optimised for higher starting torque, axial pumps, positive displacement pumps, or load shocks in wastewater applications.
Stop at Minimum Speed Function Ensures pump stops after selected time when controller is in saturation, forcing minimum speed operation.
Deragging Function Prevents clogged impellers and removes debris, reducing ragging to prolong pump lifetime and decrease service costs.
Grundfos iSOLUTIONS Integration
The Grundfos CUE is an integral part of Grundfos iSOLUTIONS, bringing intelligence to pump systems and water technology. This ecosystem utilises intelligent pumps, cloud connectivity, and digital services to enable real-time monitoring, remote control, fault prediction, and system optimisation for enhanced performance.
Connectivity Features:
- GENIbus protocol support
- Modbus RTU communication
- Multi-pump networking
- BMS/SCADA integration capability
- Cloud services ready
Accessories
MCB114 Sensor Input Module Required for differential pressure control using two sensors, or for two Pt100/1000 inputs for motor bearing temperature measurement or media temperature monitoring.
MCO101 Cascade Option Module Required for cascade control of more than one additional variable speed pump in multi-pump systems.
Applications
Water Networks
- Municipal water distribution
- Pressure boosting stations
- Water treatment plants
- Irrigation systems
Wastewater Networks
- Sewage pumping stations
- Wastewater treatment
- Industrial effluent handling
- Stormwater management
Building Services
- HVAC circulation systems
- Domestic water boosting
- Chilled water distribution
- Hot water circulation
Industrial Applications
- Process water systems
- Cooling water circulation
- Industrial washing systems
- Manufacturing processes
Why Choose Grundfos CUE?
Universal Compatibility Works with any Grundfos pump without integrated drives, providing upgrade flexibility for existing installations.
Simplified Commissioning Pre-programmed pump family settings and intuitive start-up guide reduce installation time and eliminate configuration errors.
Energy Savings Variable speed operation matches pump output to actual demand, eliminating energy waste from overcapacity operation.
Advanced Protection Built-in dry running protection, limit exceed functions, and motor protection safeguard your pump investment.
Future-Ready iSOLUTIONS integration provides cloud connectivity, remote monitoring, and digital services for intelligent pump system management.
Global Standards Compliance EMC filters meet IEC61800-3 Ed. 2 requirements for both household and industrial applications.
Genuine Grundfos Accessories & Parts
Maintain optimal CUE performance with genuine Grundfos accessories including MCB114 sensor input modules, MCO101 cascade option modules, communication cables, and mounting hardware. We stock components for all CUE variants.
Select Grundfos Pumps
Browse our complete inventory of Grundfos CUE variable frequency drives. As Grundfos Pump Suppliers in Dubai, we provide competitive pricing, technical consultation, and prompt delivery across Dubai, Sharjah, Abu Dhabi, Ajman, and all UAE locations.
Contact us for:
- VFD sizing based on motor power and voltage
- Control mode selection for your application
- Multi-pump system configuration
- iSOLUTIONS integration support
- Competitive quotations
- Delivery schedules
Intelligent Pump Control for Every Application
The Grundfos CUE transforms standard pumps into intelligent, energy-efficient systems. Whether managing water distribution networks, optimising wastewater operations, or controlling building services, this variable frequency drive delivers the performance, protection, and connectivity that modern pumping applications demand.