Checking The Direction Of Rotation; Fault Finding - Grundfos SE1 50 Series Service Instructions Manual

10.3 Checking the direction of rotation

Only start and run an unsubmerged pump for a few
seconds 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 viewed
from above.
When started, the pump will jerk in the opposite direction of the
direction of rotation. See fig. 22.
Procedure
The direction of rotation must be checked in the following way
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 will rotate
clockwise, and it will jerk counterclockwise. See fig. 22.
3. If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable. See section 12.5 Electrical
data.
Fig. 22 Jerk direction

11. Fault finding

For further information, see the installation and operating
instructions for SE1, SEV 1.1 - 11 kW. The installation and
operating instructions are accessible via the QR code and link on
the front page of this document.
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