SQ 1

Summary

Product identification

The Grundfos SQ, SQ-N, SQE, and SQE-N are submersible pumps available in 50/60 Hz versions.

• Pump Types:
  • SQ: Basic version, constant speed.
  • SQ-N: Basic version, constant speed, stainless steel EN 1.4401 (AISI 316) materials.
  • SQE: Electronic control and communication, variable speed.
  • SQE-N: Electronic control and communication, variable speed, stainless steel EN 1.4401 (AISI 316) materials.
• Motors:
  • SQ pumps are fitted with single-phase Grundfos MS 3 or MS 3-NE motors.
  • SQE pumps are fitted with single-phase Grundfos MSE 3 or MSE 3-NE motors.
  • All motors are single-phase with a maximum power of 1.85 kW.
  • Motors utilize permanent magnet technology for high efficiency.
• Type Key Example (SQE 2-55 N):
  • E: Electronic control and communication
  • 2: Rated flow [m³/h]
  • 55: Head [m] at rated flow
  • N: Material code for Stainless steel EN 1.4401

Operating limits

• Pumped Liquids: Thin, clean, non-aggressive, and non-explosive liquids, not containing solid particles or fibres.
• Sand Content: Up to 50 g/m³. Higher content will shorten pump life.
• Liquid Temperature:
  • 0.0 m/s (free convection): Max. 30 °C
  • Min. 0.15 m/s: Max. 40 °C
• System Pressure:
  • With Pressure Manager: Max. 10 bar.
  • With CU 300 or CU 301 (and pressure sensor/flow switch): Max. 10 bar.
• Borehole Size: 3" or larger.
• Installation Position: Vertically, horizontally, or any position in between. The pump must not fall below the horizontal level in relation to the motor.

Feed water

• Liquid Characteristics: Thin, clean, non-aggressive, and non-explosive.
• Solids Content: Must not contain solid particles or fibres.
• Sand Content: Maximum 50 g/m³.

Electrical

• Frequency: 50/60 Hz.
• Mains Connection: 1 x 200-240 V, 50/60 Hz.
• Motor Power: Max. 1.85 kW for all MS 3, MS 3-NE, MSE 3, and MSE 3-NE motors.
• Overvoltage Protection: Pump cuts out if voltage rises above 315 V.
• Undervoltage Protection: Pump cuts out if voltage falls below 150 V.
• Overload Protection: Motor cuts out if speed falls below 3000 min⁻¹.
• Overtemperature Protection: Motor cuts out if the internal temperature exceeds a critical limit.
• Rated Current (Example): For SQ 3-65, rated current is 6.7 A at 230 V and 7.8 A at 200 V.
• Pressure Manager Back-up Fuse: Max. 10 A.

Mechanical / Hydraulic

• Performance Range: The SQ/SQ-N/SQE/SQE-N pump range offers flows up to approximately 8 m³/h and heads up to approximately 200 m. See the official PDF for exact performance curves.
• Pipe Connection:
  • SQ 1, SQ 2, SQ 3: Rp 1 1/4
  • SQ 5, SQ 7: Rp 1 1/2
• Materials:
  • Pump:
    • SQ pump: Stainless steel EN 1.4301, AISI 304
    • SQ-N pump: Stainless steel EN 1.4401, AISI 316
  • Motor:
    • MS 3 motor: Stainless steel EN 1.4301, AISI 304
    • MS 3-NE motor: Stainless steel EN 1.4401, AISI 316
    • MSE 3 motor: Stainless steel EN 1.4301, AISI 304
    • MSE 3-NE motor: Stainless steel EN 1.4401, AISI 316
  • Impellers: Polyamide-reinforced with 30 % glass fibre, with tungsten carbide/ceramic bearings for wear resistance.
• Pump Features:
  • Built-in non-return valve with spring.
  • Low weight for user-friendly handling.
  • Upthrust bearing to protect against damage during start-up.
  • Soft starter integrated into the motor's electronic unit.
• Pump Dimensions (Example): The SQ 3-65 pump has a length of 826 mm. See the official PDF for specific pump dimensions.
• Control Unit Dimensions:
  • CU 301: 232 x 114 x 195 mm
  • CU 300: 232 x 114 x 195 mm
• Head Losses: Detailed tables for head losses in plastic pipes and ordinary water pipes are available in the official PDF.

Control and Communication

• SQ Pumps: Feature dry-running protection, high pump and motor efficiency, wear resistance, protection against upthrust, soft starter, overvoltage and undervoltage protection, overload protection, and overtemperature protection. They operate at a constant speed.
• SQE Pumps: Additionally offer variable speed control and electronic communication.
  • Variable Speed Range: Continuously variable from 3,000 to 10,700 min⁻¹.
  • Can communicate with Grundfos CU 300 and CU 301 control units.
• CU 301 Control Unit:
  • Designed for constant-pressure applications with SQE pumps.
  • Provides full control, two-way communication (via mains-borne signalling), pressure adjustment, and LED alarm indication.
  • Includes an external signal input for a pressure sensor (0-6 bar) and connection to an operating relay.
  • Communicates with the R100 remote control.
• CU 300 Control Unit:
  • Designed for SQE pumps, offering easy adjustment to boreholes and full control.
  • Provides two-way communication (via mains-borne signalling) and alarm indication via diodes on the front.
  • Includes external signal inputs for two analog sensors and one digital sensor, and a relay output for external alarm indication.
  • Can control based on signals for flow, pressure, water level, and conductivity.
  • Communicates with the R100 remote control.
  • Alarm Indications: No contact to pump, Overvoltage, Undervoltage, Dry running, Speed reduction, Overtemperature, Overload, Sensor defective.
• R100 Remote Control: A wireless infrared remote control for both CU 300 and CU 301 units, enabling monitoring and modification of operating parameters.

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

Official datasheet (PDF)

Lenntech datasheet mirror