English (GB)
11
4.1 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged in the pumped
liquid, the pumps can also operate continuously
(S1). See fig. 4.
Fig. 4 Operating levels
S3, intermittent operation
S3 operation is a series of 10-minute duty cycles
(TC). Each cycle has a 4-minute period of constant
load followed by a 6-minute period of rest. Thermal
equilibrium is not reached during the cycle. See fig.
5.
In this operating mode, the pump is partly
submerged in the surrounding liquid. The minimum
liquid level is at the top of the cable entry.
Fig. 5 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.
6.
Fig. 6 S1 operation
4.2 Start and stop levels
The difference in level between start and stop can be
adjusted by changing the free cable length.
Long free cable = large difference in level.
Short free cable = small difference in level.
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the upper edge of the clamp on the pump.
• Install the start level switch in such a way that the
pump is started at the required level; however,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
Fig. 7 Start and stop levels
Do not start the pump if the atmosphere in
the pit is potentially explosive.
TM06 5749 0116TM04 4527 1509
TM04 4528 1509
Observe the two following points.
CU 100 must not be used for Ex
applications.
TM06 5741 0116
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