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12.1 Direction of rotation
The pump may be started for a short period of time with-
out being submerged to check the direction of rotation.
For Ex pump, the check must be carried out outside of the
Ex area.
Check the direction of rotation before starting up the pump.
An arrow on the stator housing shows the correct direction of
rotation. The correct direction of rotation is clockwise when viewed
from above.
Check the direction of rotation
Check the direction of rotation in the following way every time the
pump is connected to a new installation:
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 its movement (jerk). If it
is connected correctly, the impeller rotates clockwise, and the
pump jerks counterclockwise.
3. If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable.
Direction of rotation
40
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