Ebara 2GPE EVMS3 7N5/0.75 ESPT

OPERATING CONDITIONS
EBARA GPE booster sets can be used, in their standard versions, for civil, industrial and agricultural
applications, as follows:
o building service
o water lifting and handling
o A/C
o heating
o irrigation
o washing systems
The conveyed fluid must be: clean, potable, ground or mixed water, free of solid or fibrous suspensions and aggressive chemical substances.
The units must be installed under cover, protected from the weather and freezing.
o Conveyed water temperature (depending on pumps).
o Ambient operating temperature 0 - 40°C, no higher than 1000 m above sea level.
o Max relative humidity 50% at +40°C.
NB: The system available NPSH must be greater than the NPSH demanded from the pump. For applications with different technical specifications, uses and climatic conditions (type of vector fluid, marine and aggressive
industrial conditions), please contact our sales network.

TESTS AND TRIALS
Before shipping, all EBARA booster sets are subject to hydraulic, mechanical and electrical testing.
MECHANICAL AND HYDRAULIC TESTS
o Pressure switch calibration (only if present)
o Pump direction of rotation
o Mechanical testing of moving parts and running noise (on each pump)
o Tightness test with delivery port closed and nameplate rating tests
o MANUAL trials (using button on control panel) for each pump
o AUTOMATIC trials (using switch on control panel) for unit

ELECTRICAL TESTS
o Earthing system continuity
o Applied voltage (dielectric rigidity)
o Insulation resistance

PRINCIPLE OF OPERATION OF GPE BOOSTER SETS WITH E-SPD+
GPE units with E-SPD+ are designed to operate with each pumps controlled by an INVERTER installed on board its motor. The system is controlled by a MASTER INVERTER in relation to the reference signal supply by a pressure transmitters (4 - 20 mA passive). As the system pressure varies, the MASTER pump varies its rotary speed to restore it to the setpoint. If the water demand exceeds the capacity of the pump, the second variable speed pump cuts in and, pump goes into regulation mode to maintain the pressure setpoint; this happens for all the pumps in the unit. If the water demand drops off, the pressure tends to increase and the latest pump gradually reduces its speed to restore the correct operating pressure. This results in the regulation of the speed of the other pumps, until they gradually turn off. Once the system pressure has been restored and the water demand is 0, the MASTER pump switches off automatically.