Well Pumps Submersible Pumps > CONSTANT PRESSURE |
The WPS-CP Constant Pressure Pumping System is an advanced residential water system with a 4" stainless steel submersible pump and the Franklin Electric electronic and submersible motor.
It combines the advantages of a high-speed pump with a variable speed drive to deliver water at a pre-adjustable pressure. In other words, owners of a WPS-CP unit can enjoy "city-like" water pressure.
All the internal and external metal components of the pump are constructed of stainless steel throughout, and are being cold pressed from stainless sheet steel.
The bearings and the neck rings are made from special high nitrile content rubber to ensure excellent resistance to wear and abrasion by sand suspended in the well water.
[WPS-CP* 3** - 3*** ]
*Stainless steel high speed submersible pump
**Nominal flow rate in m³/h
***Number of stage
General specifications
- Capacities from 0 to 6 m³/h.
- Head up to 80 m.
- Motor ratings up to 1,5 kW (4" motor) - 110 Hz
- Vertical and horizontal position of operation.
- Maximum fluid temperature 30 °C (for higher temperatures please contact us)
- Maximum permissible sand amount of suspended sand: 25 g/m³
- Discharge size 1 1/2"
Applications
- Private and public water supply systems
- Sprinkler and drip irrigation installations
- Booster systems
- Fire fighting systems
- Fountains and water displays
- Other industrial applications
Construction features
A. Pump-end- Coupling and flange suitable for motors with pump mounting dimensions in accordance with NEMA standards.
- Check valve, built into the discharge chamber, designed for low loss of head.
- Oversized intermediate bearings located at each pump stage to align the shaft, specially designed to optimize lubrication.
- Easy-to-replace wear-rings and bearings.
- Rugged cable guard.
- Hydraulic profiles are optimized for the attainment of high efficiencies.
- Resistance to corrosion and abrasion, i.e. the same inherent qualities of stainless steel.
- Very strong construction: minimum thickness of stainless sheet steel of 1 mm, 6 spot welding on each vane, special top bearing for every pump, very rugged coupling on the shaft, 4 straps ...
- Great ease of dismantling and assembly.
- Easy installation
- Built-in pressure sensor
- Built-in lightning and surge protection
- Proven Franklin super stainless motor design
- 230 V single phase input, three phase performance
- Nema 3R enclosure
- Adjustable pressure from 1,4 up to 4,5 bar
How it works
The WPS-CP unit consists of four components:
- High-speed pump entirely made of stainless steel
- Franklin Electric motor for high-speed rotation of 6.300 rpm
- Small pressure tank with 8 liter capacity
- Franklin Electric constant pressure control unit
Unlike conventional systems where a constant speed motor and pump intermittently fill a large pressure tank, the WPS-CP unit uses a highly accurate pressure sensor and variable speed motor to maintain constant pressure. By continually adjusting the motor speed, a constant pressure is maintained, even when demand changes.
For example, when the water is off and there is no demand on the system, the motor and pump do not run. A small demand on the system, such as a bathroom faucet, results in the motor running at a relatively low speed. As greater demands are placed on the system from opening of additional faucets, the motor speed increases to keep up with the demand and to maintain the set pessure.
Performance Curves
Benefits
- Submersible pump 4" entirely made of stainless steel (see construction)
- Constant pressure with an adjustable pressure setting form 1,4 to 4,5 bar
- Reduced pressure tank size of only 8 liters capacity
- No conventional pressure switch or flow detector required
- Innovative safety and diagnostic features protect both the motor and pump against:
Dry running protection: when air is pumped the power absorption drops severely and is less than the factory-set cutout power. The value (in function of the motor speed) ensures the pump in case of lack of water in the borehole and prevents a burnout of the motor.
Undervoltage protection: and automatic compensation of voltage fluctuations. The pump will be cut out if voltage falls below 160 V or rises above 280 V. The pump is automatically cut in again when the voltage is again in the permissible voltage range.
Overload protection: exposure of the pump to heavy load causes a rise of current consumption. The motor will automatically compensate for this by reducing the speed. If the speed drops below 35 Hz, the pump will be cut out.
Overtemperature protection: The constant pressure control box is rated IP 43 and for operating in ambient temperatures up to 50 °C. If the interior of the controller becomes overheated, it will first reduce the maximum output to the motor. If the interior continuos to overheat, the unit will shut down in order to protect itself. The pump will automatically be reset when the interior temperature returns to normal levels.
Waterlogged tank: this alarm is indicated when the pressure tank needs servicing. (f.e. Tank improperly charged with air) A defective tank can create pressure fluctuations that are often annoying and can potentially damage the residential plumbing system.
Open circuit in motor: protects the unit from damage due to the open wire in the cable connection from the motor to the drive. Short circuit in motor: protects the unit from damage due to a short between wires connected to the drive.
Freeze temperature protection: a temperature sensor internal to the controller detects the water inside the flow carrier reaches 5°C. At this moment the motor will run at a very low speed in order to maintain above freezing temperature inside the controller.
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The performance of a WPS-CP pump can be adjusted to a specific duty point within the performance curve. The constant pressure unit is ideal when the water consumption changes over time. Left the performance curves of a WPS-CP 3-3 at different speeds is shown. At what speeds will this pump run in the following situation. (see drawing below) A water well is drilled and the dynamic water level (DWL) when pumping 3 m³/h is 25 meter. The customer wants 3 bar on his plumbing system for his house and garden. This means , when we estimate 0,5 bar pressure losses in account, the pump has to perform 2,5 bar (DWL) + 0,5 bar (pressure losses) + 3 bar (set pressure) = 6 bar or 60 meter head. In this case the pump will start running at aproximately 5400 RPM when very small flow is needed. When water consumption raises, the motor speed will increase. (f.e. at 2,2 m³/h the pump speed is 5900 RPM) The maximum speed of the unit is 6300 RPM (=110 Hz) and at this point the pump will perform 3,5 m³/h. The result is a constant pressure of 3 bar on the taps in the house and the irrigation system in the garden with a total flow from 0 up to 3,5 m³/h. For higher flows the pump will perform following the curve at 6300 RPM. The pump curve for the example is represented as a dashed line. |
Exploded view and table of materials
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