Variable Speed control is a widely used technology for pump control and works by varying the pump speed to provide system water output at a constant pressure. This provides the following benefits:
- Constant pressure providing consistent, even supply to the consumer.
- Large energy cost savings as systems are always operating at peak efficiency for the demand conditions.
- Extended pump life due to reduced electrical and mechanical operating loads.
- Silent operation with no pressure shocks.
- Simplified installation due to compact dimensions and integral pump control - no separate panel is required.
Principle system components include the controller, which for larger systems is mounted on the pump motor while smaller units are mounted in line on the pump outlet, a quality Dayliff pump, a pressure sensor and a small surge tank to smooth the operating cycle. Controllers offer the following features:-
- Varies pump speed to maintain pre-set system pressure.
- Over voltage, under voltage, single phasing and electrical overload protection.
- Dry run protection with auto restart.
- Integral soft start/soft stop function which extends pump life, reduces system pressure loads and reduces mains power loadings on start up.
- One controller can control additional pumps and multiple controller systems can be synchronized for sequenced pump operation.
- Balanced pump operation ensuring equalized operating periods for each system pump.
All Dayliff booster sets use the latest technology controllers coupled to quality Grundfos pumps and are supplied complete frame mounted with inlet and outlet manifolds and valves for simple installation. Nominal system sizes are 2.5, 4 and 6 Bar, though pressures can be set to suit site conditions and the option of two and three pump configurations are available.
Three pump systems can be specified with three controllers or two controllers/1 DOL start unit. In all systems pump operation is sequenced with the number of pumps operating increasing with system demand.
Variable speed drive is now accepted as the most efficient way to provide on-demand water supply in all sorts of industrial, commercial and domestic applications. Dayliff booster sets are the ideal solution in the application of this efficient technology.
SPECIFICATIONS
2.5Bar Systems
Pumps - Dayliff DB or equivalent Grundfos CM horizontal multistage high-efficiency centrifugal pumps with stainless steel impellers and impeller housings.
Controllers - Pedrollo Steadypress inline water-cooled integrated pump control system that utilizes a variable frequency drive controller (VFD) to provide constant pressure regardless of the demand flow requirements.
4.0 and 6.0Bar Systems
Pumps - Dayliff DIN or equivalent Grundfos CR in-line vertical multistage pumps with stainless steel impellers and impeller housings.
Controllers - Options of a pump mounted Dayliff Pumpverter or Pedrollo DGfit to provide constant pressure control. Also available is an integrated control panel that includes Schneider Electric Altivar for the large motors. They are high specification VSDs suitable for use in residential and industrial applications. Drives are air-cooled and installed on motor or remote mounted with complete pump protection against overloading and over/under voltage, sleep and wake up function and pump dry run protection via installed pressure sensor.
Schneider Electric Altivar Drives are premium VSDs with advanced application functions dedicated for water pumping applications in industrial and commercial applications including embedded services such as energy and pump efficiency monitoring dashboards without additional software, and integral Modbus protocol connectivity interfaces allowing seamless integration to BMS systems. Control panel specification includes IP55 enclosure with thermal management fans, Incoming Isolator, individual pump fuses/breakers, ATV630 VFD Starters, ‘On’ and ‘Trip’ indicators, Start-Stop push button, Emergency push button, and Auto-Off-Hand Selector Switch.
