Start-Up; General Start-Up Procedure; Operating Modes 19 Note - Grundfos SEG Instrucciones De Instalación Y Mantenimiento

9. Start-up

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
The pump must not be started if the
atmosphere in the pit is potentially
explosive.
Warning
Opening the clamp when the pump is
started can lead to personal injury or
death.

9.1 General start-up procedure

Proceed as follows:
1. Remove the fuses, and check that the impeller
can rotate freely. Turn the grinder head by hand.
2. Check the condition of the oil in the oil chamber.
See also section 10.5 Oil
3. Check whether 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.
Auto-coupling: It is important to grease the
gasket of the guide claw before lowering the
pump into the pit.
6. Lower the pump into the liquid and insert the
fuses.
Auto-coupling: Check that the pump is in right
position on the auto-coupling base unit.
7. Check that the system has been filled with liquid
and vented. The pump is self-venting.
8. Switch on the power supply to the pump.
When power is on, the pump will start and pump
down to the dry-running level. This process can
be used to check that the pump functions
correctly.
In case of abnormal noise or vibrations
from the pump, other pump failure or
power supply failure, stop the pump
Caution
immediately. Do not attempt to restart
the pump until the cause of the fault
has been found and the fault corrected.
Check the condition of the oil in the chamber after
one week of operation after replacement of the shaft
seal. See section 10. Maintenance and
change.
service.
9.2 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 7 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. 8.
P
Operation
Stop
Fig. 8 S3 operation
S1, continuous operation
In this operating mode, the pump can operate
continuously without having to be stopped for
cooling. Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid.
See fig. 9.
P
Operation
Stop
Fig. 9 S1 operation
S1
S3
TC
t
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