Adjusting The Frequency Converter; Pre-Charging The Diaphragm Pressure Tank; Starting The Booster Set - Xylem LOWARA SMB /SVE Series Installation, Operation And Maintenance Manual

en – Original instructions
Figure 10 shows the operating curves in the case of two pump units in pressure adjustment
mode.
 The tank supplies water to meet the demand of the final user.
 The first pump unit starts when the pressure drops below the PS value; the speed is adjusted
 When demand decreases, the speed is reduced to minimum; at this point, one of the pump
 If demand continues to increase and the pump unit reaches maximum speed, the second
 If demand decreases further, the pump unit slows down, fills the tank and then stops when the
Figure 10: Operating mode
H
Q

5.2.1 Adjusting the frequency converter

1. To change the settings, refer to the Installation, Operation and Maintenance Manual of the
2. Use the buttons of the frequency converter to set a new pressure adjustment value, select the
3. Check that the new selected value is within the range of the head specified on the data plate

5.2.2 Pre-charging the diaphragm pressure tank

1. Check that the diaphragm pressure tank is completely drained.
2. Pre-charge the diaphragm pressure tank at 0.6 times the pressure value.

5.2.3 Starting the booster set

1. Connect the water supply.
2. Connect the power supply.
3. Check the pre-charge value of the diaphragm pressure tank.
4. Shut the on-off valves located on the delivery line of the pump unit.
5. Prime the booster set (refer to the Installation, Operation and Maintenance Manual of the
6. Connect the power supply at the panel switch and set the frequency converter to manual
7. Start the first pump unit.
8. Open the pump unit delivery on-off valve slowly and bleed the air.
9. Repeat the above operations for the other pump units.
10. Set the frequency converters to automatic mode.
22
to keep the pressure constant as demand increases.
units is deactivated.
pump unit is started and the speed is adjusted to maintain constant pressure.
PS value is reached.
Head
Flow
pump units in the Smart Pump Range.
time of the ramps, check the latest alarms or access all the settings.
of the pump unit.
pump units in the Smart Pump Range) and the suction manifold.
mode.
Pmax Maximum pressure
Pressure setting value
PS