Start And Stop Levels; Direction Of Rotation - Grundfos DP 10 Installation And Operating Instructions Manual

• 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.
P
Operation
Stop
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.
Observe the two following points.
• 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.
CU 100 must not be used for Ex
applications.
Fig. 7 Start and stop levels

4.3 Direction of rotation

All single-phase pumps are factory-wired for the
correct direction of rotation.
Before starting up three-phase pumps, check the
direction of rotation.
An arrow on the stator housing indicates the correct
direction of rotation.
t
If the direction of rotation is wrong, interchange two
of the phases in the power cable. See fig.
Alarm
Start
Stop
Additional stop
The pump may be started for a very short
period without being submerged to check
the direction of rotation.
The impeller rotates clockwise when the
pump is viewed from above. When started,
the pump will jerk in the opposite direction
of the direction of rotation.
2 or 3.
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