Checking The Direction Of Rotation; Startup - Grundfos SE1 50 Installation And Operating Instructions Manual

8.3 Checking the direction of rotation

Start and let the pump run for a few sec-
onds to check the direction of rotation.
An arrow on the top cover indicates the correct
direction of rotation. Correct direction of rotation is
clockwise.
When started, the pump jerks counterclockwise. See
fig. Jerk direction.
Procedure
The direction of rotation must be checked every time
the pump is connected to a new installation.
Proceed as follows:
1. Let the pump hang from a lifting device, for
example the hoist used for lowering the pump into
the pit.
2. Start and stop the pump while observing the
movement or jerk of the pump. If connected
correctly, the pump rotates clockwise and it jerks
counterclockwise. See fig. Jerk direction.
3. If the direction of rotation is wrong, interchange
any two of the phases in the power cable. See figs
Wiring diagram, 7-core cable, DOL to
diagrams.
Jerk direction

8.4 Startup

7.3 Wiring
8.4.1 SE1 pumps
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 section Checking and changing the oil.
3. Check that the system, bolts, gaskets, pipes and
valves are in correct condition.
4. Check the direction of rotation. See section
Checking the direction of rotation.
5. Mount the pump in the system.
6. Switch on the power supply.
7. Check whether the monitoring units, if used, are
operating satisfactorily.
8. For pumps with sensor, switch on IO 113 and
check that there are no alarms or warnings. See
section Servicing the product.
9. Check the setting of the air bells, float switches or
electrodes.
10. Open the isolating valves, if fitted.
11. Check that the liquid level is above the upper
edge of the clamp. If the level is below the clamp,
add liquid to the pit until the minimum level is
obtained.
12. Remove trapped air from the pump housing by
tilting the pump by the lifting chain.
The pump must not run dry.
If the environment is potentially explosive,
use pumps with Ex approval.
In case of abnormal noise or vibration,
stop the pump immediately.
Do not restart the pump until the cause of
the fault is identified and eliminated.
CAUTION
Sharp element
Minor or moderate personal injury
‐
Do not touch the sharp edges of the
impeller without wearing protective
gloves.
After a short period of storage, vent the
pump to let any explosive gasses escape.
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