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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 indicate the correct
direction of rotation.
If the direction of rotation is wrong, interchange two
phases in the power cable. See fig. 2 or 3.
Checking the direction of rotation
Check the direction of rotation in one of the following
ways every time the pump is connected to a new
installation.
Procedure 1:
1. Start the pump and measure the quantity of liquid
or the outlet pressure.
2. Stop the pump and interchange two phases in the
power cable.
3. Restart the pump and measure the quantity of
liquid or the outlet pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The connection which gives the larger quantity of
liquid or the higher pressure is the correct
direction of rotation.
Procedure 2:
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.
3. If connected correctly, the pump will jerk in the
opposite direction of the direction of rotation. See
fig. 8.
4. If the direction of rotation is wrong, interchange
two phases in the power cable. See fig. 2 or 3.
Fig. 8 Jerk direction
4.4 Startup
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.
TM06 5811 0116
The pump must not run dry.
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.
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.
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