Inverter for single phase pump control
October 2015
Electrical Power & Protection
Italtecnica’s Sirio 2.0 is a new electronic device for single phase electric pump control based on inverter technology. It is ideally suited for use with variable speed drives to provide constant pressure control. Sirio 2.0 controls the starting and stopping of the electric pump and modulates the motor rotations according to the water request from the system.
Sirio 2.0 provides an accurate pressure reading due to the modified pressure sensor amplification circuit, while its I/O expansion card allows connection to other devices. All functioning variables are indicated on the front panel. These include actual pressure frequency, incoming voltage, output current, internal temperature and IGBT temperature. The LV DC-DC converter features higher resistance to input voltage and fluctuations and lower EMI. Board-to-board connections are internally connected through ribbon flat cable instead of pin strips, increasing reliability as well as allowing for easier replacement during service. The user has a choice of automatic or manual functioning mode and voltage can be adjusted from the menu for operation in rural areas where power supply is not stabilised.
Sirio 2.0 automatically reduces power to the pump when the temperature increases to avoid over-temperature on the IGBT and DC bus capacitors and extend operational life. Constant pressure is assured due to regulation of the speed of the motor and energy is saved due to less pump absorption. The inverter allows a gradual pump start and stop, reducing hammering and avoiding a breakaway starting current.
Protection is provided against dry running in the event of water shortage on the suction. The device offers an automatic reset and efficient leakage monitoring to protect the pump in the event of repeated restarts. Maintenance is easy and access to the calibration menu is possible without removing the plastic enclosure. Operating on 230 V AC ±10% 50/60 Hz, the inverters have a maximum 8 bar pressure limit and are suitable for fluid temperatures up to 50°C.
For more information contact Carl Mulock, Raptech, +27 (0)11 693 5110, [email protected], www.raptech.co.za
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