Features/Product Advantages

Equipped with an external frequency converter featuring integrated control functions (TWU 3 HS-ECP); provides constant, adjustable pressure
No need for additional pressure control sensors to be installed by the user (TWU 3 HS-ECP); easy installation
Equipped with an integrated frequency converter and a fixed motor speed of 8400 rpm (TWU 3 HS-I); high output
Reduced borehole diameter and simplified installation requirements lower costs
Comprehensive monitoring and protection functions ensure absolute operational reliability

Construction

Multistage, variable-speed 3" submersible pump with a jacketed design; suitable for vertical or horizontal installation

Applications

Pumping rainwater and industrial water from boreholes and wells for sprinkling, irrigation, and water supply.

Equipment/Functions

TWU 3-...-HS-I

Integrated non-return valve
Integrated frequency converter with the following functions:
Soft start
Undervoltage, overvoltage, and short-circuit protection
Thermal overload protection for motor and converter
Dry-running protection

TWU 3-...-HS-ECP-B

Integrated non-return valve
External frequency converter with the following functions:
Soft start
Undervoltage, overvoltage, and short-circuit protection
Thermal overload protection for motor and converter
Constant pressure regulation
Leakage monitoring to prevent frequent cycling (timed)
Dry-running protection with automatic reset
Reversible rotation direction
Maximum flow rate and rated pressure settings
Pressure reading on display
Settings, operating status, and fault information displayed via LED indicators and screen

Constant Pressure Regulation Function

The frequency converter regulates the pump speed based on the set rated pressure, ensuring the submersible pump consistently delivers constant pressure.

Type Key

Technical data

Submersible pump:

Mains connection: HS-E…: 1~230 V, 50/60 Hz (connected to AC grid via frequency converter); HS-I…: 1~230 V, 50/60 Hz (connected directly to AC grid)
Submerged operating mode: S1
Fluid temperature: 3–35 °C
Minimum motor flow velocity: 0.08 m/s
Max. sand content: 50 g/m³
Max. starts per hour: 30/h
Max. immersion depth: 150 m
Protection class: IP 58
Pressure connection: Rp 1 / Rp 1¼

Frequency converter for "HS-E…" versions:

Mains connection: 1~230 V, 50/60 Hz
Output: 3~230 V / up to 140 Hz / max. 2.2 kW
Fluid temperature: 3–50 °C
Max. pressure: 8 bar
Protection class: IPX5
Connection: G 1¼

Materials

Hydraulics housing: 1.4301
Impeller: Polycarbonate
Hydraulics shaft: 1.4104
Motor housing: 1.4301
Motor shaft: 1.4305

Type

Submersible pump suitable for vertical or horizontal installation.

Hydraulics

Multistage submersible pump with sectional construction, featuring radial impellers and an integrated non-return valve. Pressure connection with threaded flange and internal thread. All parts in contact with the fluid are made of corrosion-resistant materials.

Motor (...HS-E...-B)

Corrosion-resistant permanent magnet motor for use with the supplied frequency converter. Oil-filled motor with self-lubricating bearings; maximum speed up to 8,400 rpm.

Variable frequency drive (VFD) mounted directly in the discharge pipe (overflow-proof), outside the pumped medium. Cooled by the pumped medium.

Motor (...HS-I)

Corrosion-resistant asynchronous motor with integrated VFD; direct mains connection. Rewindable, oil-filled motor with self-lubricating bearings; maximum speed up to 8,400 rpm.

Cooling

Motor cooled by the fluid. Pump must operate submerged.
Vertical installation possible with or without cooling shroud.
Cooling shroud mandatory for horizontal installation.

Scope of delivery

Hydraulic unit + motor (ready for installation)
Variable frequency drive (...HS-ECP)
1.75 m power cable
Installation and operating instructions

Accessories

Cooling shroud
Diaphragm pressure vessel
Gate valve
Float switch
Pressure switch
Electrodes
Switchgear
Alarm unit
Resin casting kit
Power cable