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Submersible Control Systems and Accessories

P/N CU3, P/N R100, P/N MTP75

Grundfos MP204 Control Unit

The Grundfos MP204 control unit is a powerful electronic motor protection device capable of detecting and preventing the most common conditions that kill or damage motors and pumps. Additionally, monitoring the details of motor and the pump performance is possible using the optional handheld R100. The MP204 control unit can provide online information of vital motor and pump data to a PC or to a monitoring system (SCADA),either directly or via the Grundfos G100 gateway data logger. Most Grundfos motors are equipped with built-in temperature sensors which can be read over the drop cable directly by the MP204.

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• Dry running
• Overload
• Short circuiting
• Control box capacitor failure
• Ground fault
• Phase reversal
• Excessive water temperature
• Overvoltage or undervoltage
• Phase and current imbalance
• Motor overheating
• Extends Grundfos motor warranty by 1 year

The R100 Infrared (For Use With CU-3)

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The MTP75 (Grundfos Motor Protection)

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• Single and Three Phase Lightning Arrestors
• Jet Pump Parallel Pipe Ejector/Foot Valve
• Pressure Switches
• Foot Valve
• Grundfos 3-inch Stainless Steel Well Seal

• Motor Protection Control Unit monitors the following parameters:
• System insulation resistance to ground before start
• Motor temperature for motors equipped with Tempcon
• Motor current consumption and current imbalance
• Voltage supply
• Phase sequence


The CU-3 protects against:


• Dry running
• Incipient motor defect
• Excessively high motor temperature (when motor is equipped with Tempcon)
• Motor burn out
• Domestic and Municipal Water Supply