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6. Starting up the product
Do not start the pump if the liquid start level is lower
FM
than the stop level or if the atmosphere in the pit is
potentially explosive.
6.1 General startup procedure
The pumps are fitted with impellers of S-tube
®
design. S-tube
impellers are wet balanced which
will reduce the vibration during operation. If the
pumps are started with the pump housing full of air,
the vibration level will be higher compared to normal
operation.
Local balancing of S-tube
wet balancing and lead to higher vibration level
during operation.
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 pit.
1. Check that the impeller can rotate freely. Turn the impeller by
hand.
WARNING
Sharp element
Death or serious personal injury
- The impeller can have sharp edges - wear
protective gloves.
2. Check the condition of the motor liquid. See also section
4. Dismantling and assembling the
3. Check that the system, bolts, gaskets, pipes and valves etc.
are in good condition.
4. Mount the pump in the system.
5. Switch on the power supply.
6. Check whether the monitoring units are operating
satisfactorily.
7. Pumps with sensor: Switch on IO 113, and check that there
are no alarms or warnings.
See installation and operating instructions for IO 113.
8. Check the setting of the 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 pump motor for S1
operation and to the middle of the pump motor for S3
operation. If the minimum level is not reached, do not start the
pump. (S1 = continuous operation. S3 = intermittent
operation).
12. Start the pump, and let it run briefly. Check whether the liquid
level drops.
13. Check if the outlet pressure and input current are normal. If
not, there might be air trapped inside the pump.
Remove trapped air from the pump housing by tilting
the pump by means of the lifting chain when the
pump is in operation.
®
®
impellers will damage the
product.
6.2 Direction of
In case of abnormal noise or vibrations from the
pump, other pump failure, power supply failure or
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.
14. After one week of operation or after replacement of the shaft
seal, check the condition of the motor liquid in the seal
housing.
For pumps without sensor, this is done by taking a sample of
the liquid. See section
4. Dismantling and assembling the
for procedure.
product
Every time the pump has been removed from the pit, go through
the above procedure when starting up again.
6.2 Direction of rotation
The pump may be started for a very short period
without being submerged to check the direction of
rotation.
For FM pumps, the check must be carried out outside
FM
the explosion-proof area.
Check the direction of rotation before starting up the pump.
An arrow on the stator housing shows the correct direction of
rotation. Correct direction of rotation is clockwise when viewed
from above.
Checking the direction of rotation
The direction of rotation must be checked in the following way
every time the pump is connected to a new installation.
Procedure
1. Let the pump hang from a lifting device, such as the hoist
used for lowering the pump into the pit.
2. Start and stop the pump while observing the movement (jerk)
of the pump. If connected correctly, the impeller will rotate
clockwise, that is the pump will jerk counterclockwise.
See fig. 23.
3. If the direction of rotation is wrong, interchange any two of the
phases in the power cable.
Fig. 23 Jerk direction
17
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