E-Pumps

Summary

Product identification

Grundfos E-pumps are pumps fitted with Grundfos MGE motors, featuring a built-in frequency converter and controller. These are standard asynchronous motors designed for 50/60 Hz operation.

The E-pump range is categorized into three functional groups:

• Multistage CRE, CRIE, CRNE pumps: Available with or without an integrated pressure sensor.
• Multistage MTRE, SPKE, CRKE, CME pumps: Supplied without a sensor.
• Single-stage TPE, TPED Series 1000, NKE, NBE pumps: Supplied without a sensor.
• Single-stage TPE, TPED Series 2000 pumps: Supplied with an integrated differential-pressure sensor.

For higher shaft power output (22-250 kW), the Grundfos CUE range of frequency converters is available.

Operating limits

E-pumps are available with MGE motors in various power ranges:

• CRE, CRIE, CRNE (with or without sensor), MTRE, SPKE, CRKE, CME (without sensor):
  • Single-phase: 0.37 - 1.1 kW
  • Three-phase: 0.75 - 22 kW
• TPE, TPED Series 1000, NBE, NKE (without sensor), TPE, TPED Series 2000 (with three-phase MGE):
  • Single-phase: 0.25 - 1.1 kW
  • Three-phase: 0.55 - 22 kW

Speed control is effective for speeds down to 40% of maximum speed.

Electrical

E-pumps operate on 50/60 Hz power supply. They feature an integrated frequency converter and controller. A built-in motor protection function protects both the motor and electronics against overload, meaning E-pump installations only require normal short-circuit protection for the cable, not additional motor protection.

Mechanical / hydraulic

E-pumps include various pump types:

• CRE, CRIE, CRNE pumps: Multistage centrifugal pumps.
• MTRE, SPKE, CRKE pumps: Vertical multistage centrifugal pumps designed for immersion in the pumped liquid, typically mounted on top of tanks.
• CME pumps: Horizontal end-suction pumps, available in cast iron and stainless steel (1.4301 and 1.4401).

Key hydraulic parameters:

• Head (H) in m
• Flow rate (Q) in m³/h
• Input power (P) in kW
• Speed (n)

The affinity equations describe the relationship between these parameters and speed changes in centrifugal pumps.

Control and Monitoring

Grundfos E-pumps offer extensive control and monitoring capabilities, either via the pump's control panel, the R100 remote control, PC Tool E-products, or external signals/bus communication.

Control Modes:

• Controlled: The pump adjusts its performance to a desired setpoint for a control parameter (e.g., constant pressure, proportional pressure, constant temperature, constant differential pressure, flow-compensated differential pressure). Pumps with factory-fitted sensors are often pre-configured for "Controlled" mode.
• Uncontrolled: The pump operates according to a constant curve.

Operating Modes:

• Normal: Standard duty operation.
• Stop: Pump is stopped.
• Min.: Pump operates at its minimum speed.
• Max.: Pump operates at its maximum speed.

Setting and Reading Parameters: E-pumps provide various settings and readings, with specific availability depending on the pump type, motor size (single-phase or three-phase), and whether a sensor is fitted.

• Common Settings: Setpoint, Start/stop, Max. curve, Min. curve, Alarm reset, Warning reset, Digital input, Controller constants (Kp, Ti), External setpoint signal, Signal relay 1 configuration, Pump number (for bus communication), Stop function, Flow limit, Sensor range and signal, Duty/standby, Operating range (min./max. speed).
• Settings for 11-22 kW motors: Signal relay 2, Motor bearings changed or lubricated, Standstill heating.
• Common Readings: Setpoint, Operating indication, Fault indication, Operating mode, Actual sensor value, Pump speed, Power input, Power consumption, Operating hours, Pump status.
• Readings for 11-22 kW motors: Lubrication status (bearings).
• Other Advanced Readings/Signals: Replacement status (bearings), Fault/Operation/Ready/Pump running/Bearing lubrication/Warning/Limit exceeded 1 and 2 signals (via external relay), Twin-pump function.

Applications

E-pumps are suitable for applications with varying demand for pump performance, offering energy savings, improved comfort, or process quality. They can also reduce the need for control valves and facilitate communication within system units.

Common application areas include:

• Heating systems: Main circulator, floor heating, mixing loops, boiler shunt, pressure-holding, exhaust gas exchanger, flow filter, domestic hot-water production/recirculation, heat surface, heat recovery.
• District heating systems: Circulator in substation, temperature shunt, booster pump, boiler feeding.
• Air-conditioning: Primary/secondary/zone circulator, pressure-holding, dry-cooler circulator, wet-cooling tower pump (internal circulator), heat recovery.
• Pressure boosting: From break/roof tanks, direct from mains, waterworks pumping, booster in mains.
• Water treatment: Inlet booster, treated-water supply, reverse osmosis booster, ultra-filtration, softening, ionising, demineralising, distillation, separators.
• Swimming pools: Circulator, filter pump.
• Fountains: Dry-pit pump.
• Commercial/industrial cooling: Brine primary/secondary/zone circulator, cooling surface, pressure-holding, dry-cooler circulator, wet-cooling tower pump (internal circulator), heat recovery.
• Cleaning and washdown: Pressure boosting, CIP systems.
• Machine tooling: Coolant pump.
• Temperature control units: Cooling of tooling or injection mould machines.

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF. Contractual data must always match the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror