En
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12
Example 3: Falling barometric pressure
If the barometric pressure falls after the pump has
stopped, the pump will register this fall as a fall in
liquid level. The result may be that the pump starts
after the set start level was reached. See fig.
Therefore, the distance between the pump stop level
and the inlet to the pit must be at least 50 cm. See
fig.
Fig. 9
Example 3: Falling barometric pressure
4.4 Direction of rotation
All single-phase pumps are factory-wired for the
correct direction of rotation.
The electronics incorporated in a three-phase pumps
ensure that the pump does not start with a wrong
phase sequence, and consequently wrong direction
of rotation.
If the pump does not run, and the liquid level is
above the dry-running sensors, interchange L1 and
L2.
An arrow on the stator housing indicates the correct
direction of rotation.
4.5 Start up
Proceed as follows:
1. Remove the fuses and 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
.
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.
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 the
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.
After one week of operation or after replacement of
the shaft seal, check the condition of the oil in the oil
chamber. See section
TM
04
43
3
9
12
09
The pump incorporates dry-running
protection via two dry-running sensors
placed on either side of the electronic unit.
If the water level falls below a dry-running
sensor, the pump will stop immediately,
and it cannot restart until the sensors are
fully submerged again.
The sensors must be cleaned at regular
intervals, depending on the deposits of
sludge on the sensors in the pit.
The pump may be started for a very short
period without being submerged to check
the direction of rotation.
Barometric pressure
Pump running
Start level set
Stop level
The pump must not run dry.
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.
Before startup, check that the system has
been filled with liquid and vented. The
pump is self-venting.
If the dry-running sensors are not covered
by liquid, the pump cannot start.
In case of abnormal noise or vibrations
from the pump, other pump failure or
power supply failure, stop the pump
immediately.
Do not attempt to restart the pump until the
cause of the fault has been found and
corrected.
If the dry-running sensors are not covered
by liquid, the pump cannot start. To check
that the phase sequence is correct, test
run the pump for a few seconds. If the
pump does not run, interchange L1 and L2
and repeat the test run.
