Grundfos CU 351
Original price was: $350.00.$165.00Current price is: $165.00.
The Grundfos CU 351 (often identified as Type CU3510 on the nameplate) is a sophisticated pump controller used as the “brain” for Grundfos Hydro MPC booster systems and circulation systems.1 It is designed to manage up to six pumps in parallel with high precision.
Below is the technical description of the CU 351/3510:
1. Overview and Purpose
The CU 351 is an intelligent control unit that optimizes pump performance based on real-time demand. Its primary role is to control the number of pumps in operation and the speed of individual pumps to maintain constant pressure or flow, thereby saving energy and reducing wear and tear on the equipment.
2. User Interface (The Display)
The front panel is designed for ease of use and provides full visibility of the system’s status:
-
LCD Display: A large, backlit graphical display that shows system pressure, pump status, and operating curves.
-
Installation Wizard: When first turned on, it features a built-in “Wizard” that guides the user step-by-step through the setup (language, date, number of pumps, and setpoints).
-
Navigation Buttons: * Arrow keys: To move through menus.
-
OK/Esc: To confirm or cancel settings.
-
Home/Help: Quick access to the main screen or on-screen assistance.
-
-
Indicator Lights: LED lights for Operation (Green) and Alarm (Red) provide instant status even from a distance.
3. Key Functionalities
-
Cascade Control: Automatically starts and stops pumps as demand changes.
-
Soft Pressure Build-up: Gradually increases pressure to prevent “water hammer” and pipe damage in empty systems.2
-
Energy Optimization: Ensures the system always operates at the “Best Efficiency Point” (BEP).
-
Logging & Statistics: Records energy consumption, running hours, and a history of alarms/warnings for maintenance.
4. Technical Specifications
| Feature | Description |
| Model | CU 351 (Type: CU3510) |
| Pumps Controlled | Up to 6 pumps (Integrated or External VFD) |
| Supply Voltage | 100–240V AC, 50/60 Hz |
| Power Consumption | Max 18W – 22W |
| Enclosure Class | IP54 (Front) / IP20 (Back) |
| Communication | Ethernet (VNC server), GENIbus, Modbus, Profibus, LON |
5. Connectivity & Remote Access
The CU 351 is highly “connected.” It supports various fieldbus protocols through CIU (Communication Interface Unit) modules. One of its best features is the standard Ethernet port, which allows the user to view the controller screen on a PC or smartphone via a VNC connection, behaving exactly like the physical unit.
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Grundfos CU 351
Original price was: $350.00.$165.00Current price is: $165.00.
The Grundfos CU 351 (often identified as Type CU3510 on the nameplate) is a sophisticated pump controller used as the “brain” for Grundfos Hydro MPC booster systems and circulation systems.1 It is designed to manage up to six pumps in parallel with high precision.
Below is the technical description of the CU 351/3510:
1. Overview and Purpose
The CU 351 is an intelligent control unit that optimizes pump performance based on real-time demand. Its primary role is to control the number of pumps in operation and the speed of individual pumps to maintain constant pressure or flow, thereby saving energy and reducing wear and tear on the equipment.
2. User Interface (The Display)
The front panel is designed for ease of use and provides full visibility of the system’s status:
-
LCD Display: A large, backlit graphical display that shows system pressure, pump status, and operating curves.
-
Installation Wizard: When first turned on, it features a built-in “Wizard” that guides the user step-by-step through the setup (language, date, number of pumps, and setpoints).
-
Navigation Buttons: * Arrow keys: To move through menus.
-
OK/Esc: To confirm or cancel settings.
-
Home/Help: Quick access to the main screen or on-screen assistance.
-
-
Indicator Lights: LED lights for Operation (Green) and Alarm (Red) provide instant status even from a distance.
3. Key Functionalities
-
Cascade Control: Automatically starts and stops pumps as demand changes.
-
Soft Pressure Build-up: Gradually increases pressure to prevent “water hammer” and pipe damage in empty systems.2
-
Energy Optimization: Ensures the system always operates at the “Best Efficiency Point” (BEP).
-
Logging & Statistics: Records energy consumption, running hours, and a history of alarms/warnings for maintenance.
4. Technical Specifications
| Feature | Description |
| Model | CU 351 (Type: CU3510) |
| Pumps Controlled | Up to 6 pumps (Integrated or External VFD) |
| Supply Voltage | 100–240V AC, 50/60 Hz |
| Power Consumption | Max 18W – 22W |
| Enclosure Class | IP54 (Front) / IP20 (Back) |
| Communication | Ethernet (VNC server), GENIbus, Modbus, Profibus, LON |
5. Connectivity & Remote Access
The CU 351 is highly “connected.” It supports various fieldbus protocols through CIU (Communication Interface Unit) modules. One of its best features is the standard Ethernet port, which allows the user to view the controller screen on a PC or smartphone via a VNC connection, behaving exactly like the physical unit.
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