Maintenance And Service - Grundfos SL1 Serie Montage- Und Betriebsanleitung

9.3 Direction of rotation
The pump may be started for a very short period
Note without being submerged to check the direction of
rotation.
Check the direction of rotation before starting up the pump.
An arrow on the motor 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. 15.
3. If the direction of rotation is wrong, interchange any two of the
phases in the power supply cable. See fig.
Fig. 15 Jerk direction
18

10. Maintenance and service

6 or 8.
Before carrying out maintenance and service, make sure that the
pump has been thoroughly flushed with clean water. Rinse the
pump parts in water after dismantling.
10.1 Inspection
Pumps running normal operation should be inspected every
3000 operating hours or at least once a year. If the pumped liquid
is very muddy or sandy, inspect the pump at shorter intervals.
Check the following points:
• Power consumption
See pump nameplate.
• Oil level and oil condition
When the pump is new or after replacement of the shaft seal,
check the oil level and water content after one week of
operation. If there is more than 20 % extra liquid (water) in the
oil chamber, the shaft seal is defective. The oil should be
changed after 3000 operating hours or once a year.
Use Shell Ondina 919 oil or similar type.
See section
• Cable entry
Make sure that the cable entry is watertight (visual inspection)
and that the cable is not sharply bent and/or pinched.
• Pump parts
Check impeller, pump housing, etc. for possible wear.
Replace defective parts.
See section
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
Before starting work on the pump, make sure that the
fuses have been removed or the mains switch has
been switched off. Make sure 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.
Warning
Maintenance work on explosion-proof pumps must
be carried out by Grundfos or a service workshop
authorized by Grundfos.
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.
10.2.1 Oil change.
10.2.2 Removing the pump housing and impeller.