Borehole pumps of the Grundfos SQ series. Grundfos SQ series well pumps with and without cable pre-installed: which one to choose Grundfos soft start pumps

FIELD OF APPLICATION: Supply of ground water to the water supply systems of private houses, small waterworks and irrigation systems.

BENEFITS:

• Small dimensions and weight (pump diameter 74 mm)
• ease of installation savings on drilling and well construction
• Integrated check valve
• Floating impellers
• the pump is resistant to sand content in pumped water up to 50 g/m3
• Ceramic bearings
• Stainless steel pump parts
• increased wear resistance in relation to sand, the possibility of pumping drinking water
• suction filter
• Permanent magnet motor
• high efficiency
• low power consumption
• increased starting torque
• high power over a wide load range
• Built-in dry run protection
• Soft start function
• water hammer protection in the system
• the risk of engine wear is minimized and overloading of the network during start-up is also prevented
• Integrated motor protection
• overload protection
• overheat protection
• overvoltage and undervoltage protection
• the ability to work at reduced (up to 150 V) or increased (up to 315 V) voltage, surges and voltage drops in the network
• protection against axial displacement of the impeller floating up
• Speed ​​control of SQE pumps
• when using the CU 301 control unit with Grundfos Go Remote control

Country of manufacture: Germany, Mexico

Warranty for SQ pumps is 3 years. Warranty for SQE pumps is 5 years.

Opens the production line of submersible borehole pumps of the world-famous company Grundfos model , - the optimal ratio of this model isprice and quality , recommended nwhen used in shallow wells with a small volume of pumped water, it is used in wells and wells in suburban houses, cottages and dachas with a small number of consumers.Borehole pumps Grundfos models, are appreciated by consumers and installers all over the world for the ratio of their small weight and diameter with a very large volume of pumped water. In many countries, buyers for water supply prefer to buy Grundfos series well pumps. SQE and SQ- the price of devices in our company is always acceptable., as well as in our company you can order the installation of this equipment.

Small diameter, high performance, reliability and low weight are the hallmark of these pumps. The Grundfos borehole pump, and other models of this manufacturer, are equipped with a built-in protection system against dry running, power surge and overheating, which contributes to a longer service life of this unit.

Buy Grundfos submersible borehole pump (, SQ 3-65 and others ) , the price of which is attractive to Russians, is preferred, in addition to private consumers and horticulture, for field irrigation and domestic water supply. Devices quickly reduce the level of groundwater, while not being afraid of corrosion or voltage drops. These units are recognized as the optimal solution in terms of price, power, ease of use.

Main advantages

Dry run protection with automatic restart

The SQ and SQE pumps are equipped with a pump dry-running protection with automatic restart.

Principle of operation

When the power consumption drops to the minimum Pcut-out value (less than 65%), the electric motor stops after 5 seconds. 5 minutes after such a stop, the electric motor automatically turns on and runs continuously for 30 seconds (to remove air from the pump part) before stopping again in case of low power consumption.

The emergency stop of the electric motor is also reset when the power is turned off for more than 1 minute.

After turning on the power supply, the dry-running protection function is inactive for 40 seconds (to bleed air from the pump part).

If the pump is not completely immersed in water when starting up, damage to the impellers may occur!

The built-in dry-running protection is intended for emergency shutdown of the pump and cannot be used to regularly turn off the pump in case of insufficient well flow.

wear resistance

Increased demands are placed on the wear resistance of a borehole pump. The impellers of the SQ and SQE pumps are "floating". The impeller bearing is made of high strength tungsten carbide. The design of the impeller and the materials used guarantee high wear resistance in relation to the abrasive components of the medium (sand) and significantly increase the service life of the pump.

Smooth start

The built-in electronic block of the electric motor provides a possibility of soft start-up. As a result, the starting current is reduced so that the pump smoothly accelerates in an optimal manner.

Soft start minimizes the risk of motor wear and prevents network overload during start-up. Excellent starting performance is the result of the built-in frequency converter and high starting torque. High reliability is also achieved at low power supply voltage.

High pump efficiency

The working parts of the pump are made of glass fiber reinforced polyamide (fiber content 30%). Thanks to the design of the pump and the choice of high-tech materials, high efficiency is achieved with low energy consumption.

High motor efficiency

The graph shows that MS(E)3 permanent magnet motors (PM motors) are characterized by high efficiency under various loads.

The use of a PM motor is the most beneficial and energy efficient compared to conventional AC motors.

Protection of the pump during start-up against axial displacement ("floating") of the impeller

The design of SQ and SQE includes an upper thrust bearing that protects the pump impellers from "floating up". Thus, even with a very low counter pressure, starting the pump cannot cause the impeller to move along the axis of the pump shaft, which otherwise leads to a malfunction or even to failure of the pump and the electric motor.

Overload protection

A blocked impeller or shaft puts an increased load on the pump, causing an increased current draw. The protection built into the motor compensates for this by reducing the shaft speed.

When the speed drops below 65% of the nominal, the pump automatically switches off. In this way, the pump is reliably protected against overloads, and no additional protective measures are required.

overheat protection

PM motors heat up little during operation due to high efficiency and efficient heat removal, thereby providing optimal engine operating conditions.

To provide additional protection, the electronic unit is equipped with a built-in temperature sensor. When overheating, the engine turns off; when the temperature drops, the motor will automatically turn on.

Surge resistance

Out-of-town power networks are characterized by interruptions in power supply and the presence of voltage drops that threaten the normal operation of the pump. The SQ/SQE pump motor has a unique operating voltage range of 150V to 315V while maintaining close to nominal performance levels.

If the specified range limits are exceeded, the motor electronics switches off the pump, and then, as soon as the permissible operating voltage is established, the pump automatically switches on and continues to work in the nominal mode.

Operational reliability

Electric motors are designed to ensure high reliability and have the following design features:

Bearings made of high-strength combibath material tungsten carbide/ceramic

Upper thrust bearing installed for protection againstaxial displacement of the "floating" of the impeller

Service life - same as conventional AC motors current.

Grundfos SQ is a popular downhole pump series - sq 1, sq 2, sq 3, 5th and 7th, for wells with a diameter of 74 mm (from 3 "and above). The number in the name of the series means the nominal value of the flow per cubic meter. m/h Some popular pump models are SQ 2-70, SQ 2-55, SQ 3-105, SQ 3 -65.

Grundfos SQ well pumps have a soft start, built-in motor protection: against dry operation, against voltage drop (below 150 V) and overvoltage (over 280 V), from overload and overheating.

Grundfos SQ pumps, made of stainless steel, are used for pumping clean, chemically non-aggressive liquids that do not contain fibers and solid particles (permissible sand content is not more than 50 g / m3).

Outer diameter - 74 mm (3"). Nominal flow rate - 1, 2, 3, 5 or 7 m3/hour.

The pumps are equipped with a single-phase electric motor MS 3 with permanent magnets, the drive of which, due to the built-in frequency converter, ensures a constant speed of rotation. Noise level - below 70 dB (A). Made of stainless steel (DIN 1.4301, AISI 304).

SQ pumps have a variety - SQ-N. They are also made of stainless steel, but with different properties DIN 1.4401, AISI 316 and are equipped with a single-phase motor MS 3-NE, the drive of which, due to the built-in frequency converter, ensures a constant rotation speed. Grundfos SQ-N pumps are available on request only.

Grundfos SQ pumps - SQ 1, SQ 2, SQ 3, SQ 5, SQ 7.

Diameter - 74 mm (3"). Power supply - 1x200-240 V, 50 Hz.

Additional equipment and accessories

Name		Description
Water supply kit (without SQ pump)		Applies to pumps of the following models only: SQ 1-65, SQ 1-80 SQ 2-35, SQ 2-55, SQ 2-70, SQ 2-85 SQ 3-40, SQ 3-55, SQ 3-65, SQ 3-80 The kit includes: pressure switch PM 115 (with cable 1.5 meters); pressure tank with a capacity of 18 liters. and wall mount to it; stopcock 3/4" with drain; pressure gauge 0-10 bar and fitting 1/4" to it; tee 1"-3/4"-1"; 10 cable ties for fastening the cable.
Switch cabinet SQSK		Switch cabinet for SQ pumps. For automatic on/off pumps by pressure, level. Dimensions: 125x125x100. Protection class - IP65.
Pressure switch PM 1 (1.5 bar)		Pressure switch PM 1 (15) with dry running protection. 2-pole. Switching pressure - 1.5 bar. Maximum load - 6 A. Cable length - 1.5 m.
Pressure switch PM 1 (2.2 bar)		Pressure switch PM 1 (22) with dry run protection. 2-pole. Switching pressure - 2.2 bar. Maximum load - 6 A. Cable length - 1.5 m.
Pressure switch PM 2		Pressure switch PM 2 with dry run protection and indication of the current pressure. 2-pole. Switching pressure - 1.5 - 5.0 bar. Maximum load - 10 A. Cable length - 1.5 m.

Advantages of the Grundfos SQ borehole pump:

• dry run protection. If there is no water in the well, or when the pressure reaches the Pcut-out level (the pump cut-off pressure set at the factory settings), the pump automatically turns off, which prevents the engine from burning out.
• high pump and motor efficiency. Due to the fact that the working parts are made of glass-fibre reinforced polyamide, high efficiency and low energy consumption are achieved. The permanent magnet motors used are highly efficient under various loads, and are more energy efficient than conventional AC motors.
• wear resistance of pump impellers. SQ pump impellers are floating. And the bearing is made of high strength tungsten carbide. This design and materials confidently resist abrasion and significantly increase the service life.
• protection against "floating" of the impeller. With low back pressure, starting the pump can cause the impeller to move upwards (“float”) along the vertical axis of the shaft. Such a change can even lead to pump failure. But the use of the upper thrust bearing in the design of the SQ borehole pump reliably protects the pump from the "floating" of the impeller.
• smooth start. Due to the electronic unit built into the electric motor, the possibility of a soft start is achieved. When starting, the starting current decreases and the pump accelerates smoothly in the optimum mode. Soft start minimizes the risk of motor wear and prevents network overload during start-up.
• overload protection. A high pump load leads to an increase in current consumption. In the electric motor, this is compensated by automatic speed control (if it decreases to 65% of the nominal value, the electric motor is turned off). In addition, any blockage of the impeller is fixed and the power is turned off.
• overheat protection. The SQ pump motor itself, thanks to a well-designed built-in cooling system, heats up little. But to provide additional protection, the electronic unit has a built-in temperature sensor. When the engine is overheated, it turns off; when the engine is cold, it turns on.
• speed control. The MSE 3 electric motor offers the possibility of speed control within 65-100% of the range. You can select a point with any characteristic from the operating range of the SQ pump. Therefore, the characteristics of the motor can be matched to any requirements. For speed control, the CU 300 control unit and the R 100 remote control must be used.
• mounting. SQ/SQE pumps can be installed vertically, obliquely and horizontally (but it MUST NEVER be installed below 90 degrees from vertical, i.e. below the horizontal plane relative to the position of the motor).

The Grundfos SQ borehole pumps by the Danish company Grundfos, due to their well-thought-out and reliable design, are deservedly appreciated by consumers in private households and households, small waterworks and irrigation systems, when pumping water into various containers and reservoirs. The greatest use of SQ well pumps is found in the sector of individual water supply for cottages, private houses, summer cottages. For the end user, SQ pumps are reliable, easy to install and operate.

Grundfos SQ borehole pumps are designed for individual water supply, small water and sprinkler installations, irrigation hydraulic systems. These are compact (3-inch) multi-stage centrifugal pumps that can be installed in wells that are slightly larger than the pump. They are used for pumping clean, non-aggressive liquids that do not contain solid particles or fibers, with temperatures from 0 to +35 °C (sand content is allowed no more than 50 g/m 3).

Main applications:
- for supplying groundwater to water supply systems;
- for private houses;
– for small waterworks;
– for irrigation systems;
- for pumping water into tanks.

The working parts of the "SQ" pump are made of glass fiber reinforced polyamide (fiber content 30%). Thanks to the choice of such high-tech materials and the design of the pump, high efficiency is achieved with low energy consumption. Impellers with high-strength carbide bearing guarantee high wear resistance against abrasive media (sand) and significantly increase pump life. Starting the pump at very low back pressure can cause the impeller to move up along the axis of the pump shaft (“float”), which can lead to malfunction or even failure of the pump and motor. To protect against “floating”, the pump design has an upper thrust bearing.

The pumps are equipped with a single-phase (1×200-240 V, 50/60 Hz) Grundfos MS 3 submersible motor up to 1.85 kW, which is equipped with liquid lubricated plain bearings. The built-in electronic unit contains a frequency converter with soft start. The motor drive through the built-in frequency converter provides a constant speed of rotation. Soft start minimizes the risk of motor wear and prevents network overload during start-up. High efficiency is ensured by the use of permanent magnets in the electric motor. The motor is protected from overheating by a built-in temperature sensor, from overload by automatic speed control, and does not need additional protection. The pumps will be able to operate at reduced (up to 150 V) or increased (up to 315 V) electrical voltage in the network, surges and voltage drops.

The modular design of the pump and motor facilitates installation and maintenance. SQ borehole pumps can be operated in a vertical, horizontal or inclined position, but they must never be installed below the horizontal plane relative to the position of the electric motor. The pumps can be submerged up to 150 meters below the water level. For vertical installation, the pump must be completely submerged in water, for horizontal installation - at a level of 0.5 m below the dynamic water level. If there is a risk of contamination, the pump must be placed in a protective cover (accessory).

Main features and advantages of «SQ» borehole pumps:

• Groundwater supply for individual water supply
• Small pump diameter: 74mm
• Well diameter: from 76 mm
• Power: 1.02 to 2.54 kW
• Feed: up to 9 m 3 / h
• Hydrostatic head: up to 237 m
• Fluid temperature: 0 to +35 °C
• Possibility of pumping drinking water
• High efficiency
• Increased wear resistance (stainless steel wetted parts)
• Floating impellers with reverse axial displacement protection
• Ceramic bearings
• High-efficiency, single-phase, permanent magnet motor "MS 3" that does not require additional protection
• Low power consumption
• Constant speed due to integrated frequency converter
• Soft start function (protection against water hammer in the system and network overload)
• Built-in motor protection (overload, overheat, voltage surge)
• Built-in dry run protection
• Built-in check valve with spring
• Suction filter (blockage protection)
• High flow rate
• Pressure line connection: 1¼˝ (models SQ 1, SQ 2, SQ 3) and 1½˝ (models SQ 5, SQ 7)
• Cable length 1.5 m (other lengths on request)
• Ease of installation and maintenance
• Reliable operation in any position (vertical, horizontal, inclined)
• Small size and weight
• Reliability and durability
• Can be installed in an existing water supply system

Grundfos SQ series borehole pumps are a three-inch (or 76 mm) device with multi-stage functionality. The main working elements are "floating" wheels with their own bearings made of ceramic to reduce friction, as well as a single-phase electric pump motor with a permanent magnet, which provides a sufficiently high functional efficiency with a wide power range.

This series of borehole pumps differs from other analogues in a smooth start, the presence of a number of protective functions from reverse in case of possible axial displacement, from overvoltage or voltage dips, overload or overheating of the structure is excluded.

Each model also includes a detachable cable connector.

Grundfos SQ series borehole pumps have proven to be effective as the main link in creating a reliable water supply system using wells or wells in the private sector, in suburban areas or at production facilities with autonomous water supply. Their high performance allows you to solve problems of various complexity, and a wide range of models will help you choose the optimal device in accordance with the desired result.

• Absolute reliability of each model.

Considering the installation environment of the Grundfos SQ series borehole pump, the manufacturer uses highly corrosion-resistant stainless steel as the material of the unit body. Also, in a number of internal elements, in particular bearings, technological composite materials are also used, which reduce the wear of the modules and increase the service life. These advantages of the Grundfos SQ series pumps are complemented by unique protection systems and perfect process controllability, eliminating any risk of emergency situations.

• A wide range of performance is the key to achieving high functional efficiency.

The modern design of the housing of this unit consists in the absolute optimization of its design, which made it possible to achieve impressive efficiency in the hydraulic part, combined with low consumption of electrical energy.

• Installation does not require special tools and knowledge.

The pump is an elongated tubular design that allows for convenient installation of the station in a horizontal or vertical design. Placement does not require any effort and can be done independently or with the involvement of specialists. The simplification also affected the operating conditions, which is based on the automatic operation of the device. The same is true for service: in case of silting, dismantling is easy. The whole structure is modular with easy disassembly.

• Complete security.

The electric motor eliminates the risk of fuel substances and other chemical compounds entering the drinking water. The cable included in the package is made of special rubber used in the food industry, which is confirmed by the relevant certificates. There is no inconvenience associated with high noise operation.

• Additional control options.

The basis for controlling the pumps of the Grundfos SQ series is the complete automation of the entire process. At the same time, the device independently selects the operating mode depending on the operating conditions, maintaining high performance combined with stable operation of the entire system without increasing energy costs.

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