KSB ILN, Руководство по эксплуатации

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4 Description of the Pump (Set)
22 of 92
ILN / ILNC / ILNR
5211.8/08-EN
4.6.1 Configuration and function of ILNS/ILNCS pump sets with auxiliary pump
Fig. 5: Priming system using auxiliary pump
1 Check valve 2 Filter
3 Solenoid valve 4 Auxiliary pump
5 Discharge nozzle for air/water 6 Pressure controller
Function During commissioning/start-up the auxiliary pump (4) starts up and the solenoid valve
(3) opens, so air can escape from the piping. After duration T1
5)
has passed, the main
pump starts up; both pump are running. When the fluid handled reaches the main
pump, the pressure controller (6) recognises a pressure rise. A timer stops the
auxiliary pump and closes the solenoid valve after the duration T2
6)
has passed.
When the pressure controller detects a pressure of 0.4 bar, it automatically starts up
the auxiliary pump to vent the main pump and the piping. The main pump keeps
running. When 70 % of the operating pressure of the main pump or the minimum
pressure set at the pressure controller are detected, the pressure controller stops the
auxiliary pump.
The duration T1 depends on the quantity of air escaping. The minimum value for T1
is determined in manual venting tests. The timer is then set to this value.
The duration T2 is influenced by any instability during the commissioning/start-up
process.
CAUTION
Auxiliary pump running too long
Motor overheated!
▷
Set duration T2 to a maximum of 5 seconds or to the star-delta start-up time.
▷ The total runtime of the auxiliary pump must not exceed 15 seconds.
5
T1: duration until the main pump starts up
6 T2: duration until the solenoid valve is closed