Operating Modes; Direction Of Rotation; Maintenance And Service - Grundfos SL1 Serie Instructions D'installation Et D'utilisation

9.2 Operating modes

The pumps are designed for intermittent operation (S3).
When completely submerged, the pumps can also operate
continuously (S1).
S3, intermittent operation:
Operating mode S3 means that within 10 minutes the pump must
be in operation for 4 minutes and stopped for 6 minutes.
See fig. 14.
In this operating mode, the pump is partly submerged in the
pumped liquid, i.e. the liquid level reaches at minimum the top of
the cable entry on the stator housing. See fig. 2.
P
Operation
4 min.
Stop
Fig. 14 S3, intermittent operation
S1, continuous operation:
In this operating mode, the pump can operate continuously
without being stopped for cooling. See fig. 15. Being completely
submerged, the pump is sufficiently cooled by the surrounding
liquid. See fig. 2.
P
Operation
Stop
Fig. 15 S1, continuous operation

9.3 Direction of rotation

The pump may be started for a very short period
without being submerged to check the direction
Note
of rotation.
Check the direction of rotation before starting up the pump.
An arrow on the stator housing indicates the correct direction of
rotation. Correct direction of rotation is clockwise when viewed
from above.
Checking the direction of rotation
The direction of rotation should 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, e.g. the hoist used for
lowering the pump into the tank.
2. Start and stop the pump while observing the movement (jerk)
of the pump. If connected correctly, the pump will rotate
clockwise, i.e. it will jerk counter-clockwise. See fig. 16.
3. If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable. See fig. 6, 7 or 8, 9.
22
6 min.
t
10 min.
t
Fig. 16 Jerk direction

10. Maintenance and service

Warning
During maintenance and service, including
transportation to service workshop, always
support the pump by means of lifting chains or
place it in horizontal position to secure stability.
Warning
FM
Maintenance work on explosion-proof pumps must
be carried out by FM approved service centres.
However, this does not apply to the hydraulic
components, such as pump housing, impeller, etc.
Warning
The cable must only be replaced by Grundfos or
a service workshop authorized by Grundfos.
Warning
Before starting work on the pump, make sure that
the fuses have been removed or the mains switch
has been switched off. It must be ensured that
the power supply cannot be accidentally
switched on.
Make sure that all protective equipment has been
connected correctly.
Warning
Before starting work on the pump, make sure that
the mains switch has been locked in position 0.
All rotating parts must have stopped moving.
Before carrying out maintenance and service, it must be ensured
that the pump has been thoroughly flushed with clean water.
Rinse the pump parts in water after dismantling.