Starting Up The Product; General Startup Procedure; Operating Modes - Grundfos SL1.50.65.09 Instrucciones De Instalación Y Funcionamiento

9. Starting up the product

Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
Make sure that all protective equipment
has been connected correctly.
The pump must not run dry.
Warning
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.
Warning
Opening the clamp while the pump is
running can lead to personal injury or
death.

9.1 General startup procedure

Proceed as follows:
1. Remove the fuses and check that the impeller
can rotate freely. Turn the impeller by hand.
2. Check the condition of the oil in the oil chamber.
See also section 10.5 Oil
3. Check that the monitoring units, if used, are
operating satisfactorily.
4. Check the setting of the air bells, float switches
or electrodes.
5. Open the isolating valves, if fitted.
6. Lower the pump into the liquid and insert the
fuses.
7. Check whether the system has been filled with
liquid and vented. The pump is self-venting.
8. Start the pump.
In case of abnormal noise or vibrations
from the pump, other pump failure or
power supply failure, stop the pump
immediately.
Caution
Do not attempt to restart the pump until the
cause of the fault has been found and the
fault corrected.
After one week of operation or after replacement of
the shaft seal, check the condition of the oil in the
chamber. See section 10. Maintenance and service
for procedure.
18
change.

9.2 Operating modes

The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 8 Operating levels
• S3, intermittent operation
S3 operation is a series of identical duty cycles
(TC) each with a constant load for a period,
followed by a rest period. Thermal equilibrium is
not reached during the cycle. See fig. 9.
P
Operation
Stop
Fig. 9 S3 operation
• S1, continuous operation
In this operating mode, the pump can operate
continuously without being stopped for cooling.
Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid. See
fig. 10.
P
Operation
Stop
Fig. 10 S1 operation
S1
S3
TC
t
t