Starting Up The Product; General Startup Procedure; Operating Modes - Grundfos SL1 AUTOADAPT Serie Montage- Und Betriebsanleitung

10. 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
Opening the clamp when the pump is
started can lead to personal injury or
death.
Warning
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.

10.1 General startup procedure

Proceed as follows:
1. Remove the fuses. 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 11.8 Oil
3. Check that the level sensor is clean, and that the
protective cap is intact.
4. Check that the dry-running sensors are clean.
5. Open the isolating valves, if fitted.
6. Lower the pump into the liquid, and insert the
fuses.
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 the power is on, the pump will start and
pump down to the dry-running level. This function
can be used to check the pump.
If the dry-running sensors are not covered
by liquid, the pump cannot start. To check
that the phase sequence is correct, test
Note
run the pump for a few seconds. If the
pump does not run, interchange L1 and L2
and repeat the test run.
After one week of operation after replacement of the
shaft seal, check the condition of the oil in the oil
chamber. See section 11. Maintenance and service
for procedure.
change.

10.2 Operating modes

The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
• S3, intermittent operation:
S3 operation is a series of identical duty cycles
(TC) each with a constant load for a period.
Thermal equilibrium is not reached during the
cycle. See fig. 11.
Operation
Stop
Fig. 11 S3 operation
• S1, continuous operation:
The pump can operate continuously without
having to be stopped for cooling. See fig. 12.
Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid.
P
Operation
Stop
Fig. 12 S1 operation
TC
t
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