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General| Brand | Grundfos |
|---|---|
| Model | CU 301 |
| Category | Water Pump |
| Language | English |
Describes the CU 301's role in maintaining constant water pressure by adjusting pump performance.
Explains pressure sensing, CU 301 adjustment, and mains borne signalling for pump communication.
Provides guidelines for selecting the correct pump type for system functionality and performance.
Presents data tables for SQE and SQE-NE pump types, including head at different flow rates.
Recommends positioning the pressure sensor close to consumption points to minimize pressure loss effects.
Details how to set diaphragm tank precharge pressure relative to the system pressure setting.
Advises on installing a pressure relief valve for over-pressurization protection.
Explains the function of the On/Off button and the meaning of the green and red indicator lights.
Describes how the CU 301 indicates pump operation status using lights and graphics.
Details how to adjust the desired system pressure using the arrow buttons on the CU 301.
Explains how to lock and unlock the CU 301 control buttons to prevent accidental changes.
Describes the permanent green light indicating a service alarm and lists possible causes.
Explains the automatic dry-running protection feature and its indicator light.
Allows setting and reading of operating parameters like pressure and mode.
Provides operating data for pump, motor, and sensor without allowing changes.
Enables configuration of the CU 301, pump/motor, and sensor settings.
Details how to set the required system pressure within a specified range.
Explains the different operating modes (Max, Normal, Min, Stop) for the pump.
Shows the current alarm status and lists possible alarms like overload or sensor defects.
Displays the current operating mode selected for the pump.
Shows the real-time system pressure measured by the sensor with accuracy.
Indicates the current rotational speed of the pump motor in RPM.
Displays the temperature of the motor electronics, with units selectable by language.
Shows the current power input and accumulated power consumption in kWh.
Tracks the total operating hours and the number of times the pump has started.
Sets the sensor output signal type (e.g., 4-20 mA) and measurement unit (bar, psi).
Allows selection between 'Automatic' sensor configuration or 'Manual' override.
Sets the upper limit for the system pressure, overriding front panel settings.
Configures automatic restart settings after an alarm, including time and doubling options.
Sets the minimum power input threshold that triggers dry-running protection.
Defines the maximum rotational speed the pump can operate at.
Adjusts the speed at which the pump starts to manage potential pressure surges.
Allows enabling or disabling the control buttons on the CU 301 unit.
Sets how pump operation is indicated: 'Running light' or 'Constant light'.
Assigns a unique number to the CU 301 and pump for communication in multi-unit systems.
Explains how the service alarm light indicates operational data issues and lists common alarm situations.
Addresses issues with the CU 301's front cover lights, checking ribbon cable and internal defects.
Diagnoses why the pump doesn't start, checking indicator lights, pressure, and sensor.
Identifies causes for inconsistent pressure, including pump type, precharge, and sensor placement.
Investigates why the pump runs continuously, checking pressure limits and sensor function.
Diagnoses 'No contact to pump' errors, checking motor type, cable length, and cross-communication.
Addresses 'No contact to pump' errors when CU 301 and SQE pump numbers do not correspond.
Diagnoses overvoltage or undervoltage indicators by checking supply voltage against motor type.
Explains dry running detection based on low power consumption and high motor speed.
Addresses combined speed reduction and undervoltage faults, checking supply voltage and pump type.
Diagnoses faults with speed reduction and overload, checking for worn pumps or oversized motors.
Investigates overtemperature alarms by checking motor cooling and flow velocity.
Addresses overload issues by checking for worn pumps or motors that are too large.
Diagnoses defective sensor errors by checking wiring, R100 settings, and voltage signals.
Investigates pumps cycling on/off due to 'No communication' or excessive load.
Addresses excess pressure issues occurring briefly at the start of consumption.
Provides instructions for safe and correct electrical connection of the CU 301 unit.
Details wiring for power supply terminals 1, 2, and PE, including torque and wire size.
Details wiring for pump terminals 3, 4, and PE, including torque and wire size.
Explains connection for the pressure sensor (terminals 5, 6, 7) and signal ranges.
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