Grundfos SL1 Serie Instrucciones De Instalación Y Funcionamiento página 17

9. Startup
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 tank is potentially explosive.
Warning
It may lead to personal injuries or death to open the
clamp while the pump is operating.
9.1 General startup procedure
This procedure applies to new installations as well as after
service inspections if startup takes place some time after the
pump was placed in the tank.
1. Remove the fuses and check that the impeller can rotate
freely. Turn the impeller by hand.
Warning
The impeller can have sharp edges - wear protective
gloves.
2. Check the condition of the oil in the oil chamber. See also
section 10.1 Inspection.
3. Check that the system, bolts, gaskets, pipework and valves
etc. are in correct condition.
4. Mount the pump in the system.
5. Switch on the power supply.
6. Check whether the monitoring units, if used, are operating
satisfactorily.
7. For pumps with WIO sensor, switch on the IO 113 and check
that there are no alarms or warnings. See section
8. Check the setting of air bells, float switches or electrodes.
9. Check the direction of rotation. See section
rotation.
10. Open the isolating valves, if fitted.
11. Check that the liquid level is above the motor for S1 operation
and above the cable entry for S3 operation. See fig. 14. If the
minimum level is not reached do not start the pump.
12. Start the pump and let the pump run briefly, and check if the
liquid level is falling.
13. Observe if the discharge pressure and input current are
normal. If not there might be air trapped inside the pump.
Trapped air can be removed from the pump housing
by tilting the pump by means of the lifting chain when
Note
the pump is in operation.
In case of abnormal noise or vibrations from the
pump, other pump failure or power supply failure or
Caution
water supply failure, stop the pump immediately. 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. For pumps without
sensor, this is done by taking a sample of the oil. See section
10. Maintenance and service for procedure.
Every time the pump has been removed from the tank, go through
the above procedure when starting up again.
9.2 Operating modes
The pumps are designed for intermittent operation (S3).
When completely submerged, the pumps can also operate
continuously (S1).
S3, intermittent operation:
Operating mode S3 means that within 10 minutes the pump must
be in operation for 4 minutes and stopped for 6 minutes.
See fig. 12.
In this operating mode, the pump is partly submerged in the
pumped liquid, i.e. the liquid level reaches at minimum the top of
the cable entry on the motor housing. See fig. 2.
Fig. 12 S3, intermittent operation
S1, continuous operation:
In this operating mode, the pump can operate continuously
without being stopped for cooling. See fig. 13. Being completely
submerged, the pump is sufficiently cooled by the surrounding
liquid. See fig. 2.
Fig. 13 S1, continuous operation
8.6 IO 113.
9.3 Direction of
Fig. 14 Start and stop levels
Make sure that the effective volume of the tank does not become
so low that the number of starts per hour exceeds the maximum
permissible number.
P
Operation
4 min. 6 min.
Stop
10 min.
P
Operation
Stop
Min. 10 cm
Alarm
Start
Stop S1 operation
Stop S3 operation
t
t
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