Direction Of Rotation; Maintenance And Service; Inspection - Grundfos SEG Serie Montage- Und Betriebsanleitung

9.3 Direction of rotation

The pump may be started for a very
Note
short period without being submerged
to check the 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 and an arrow at the
pump inlet indicate 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.
If the direction of rotation is wrong, interchange two
phases. See fig. 4 or 5.
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 discharge pressure.
2. Stop the pump and interchange two phases.
3. Restart the pump and measure the quantity of
liquid or the discharge 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, e.g. 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. 10.
4. If the direction of rotation is wrong, interchange
two phases. See fig. 4
Fig. 10 Jerk direction
20
or 5.

10. Maintenance and service

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.
All rotating parts must have stopped
moving.
Warning
Except for service on the pump parts,
all other service work must be carried
out by Grundfos or a service workshop
authorised by Grundfos.
Flush the pump thoroughly with clean water before
carrying out maintenance and service. Rinse the
pump parts in water after dismantling.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.

10.1 Inspection

Pumps running normal operation should be checked
every 3000 operating hours or at least once a year.
If the dry-solids content of the pumped liquid is very
high or sandy, check 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 after one week
of operation.
Use Shell Ondina X420 oil or similar type.
See section 10.5 Oil change.
The table below states the quantity of oil in the oil
chamber of SEG pumps:
Pump type
SEG up to 1.5 kW
SEG 2.2 to 4.0 kW
Used oil must be disposed of in
Note
accordance with local regulations.
Quantity of oil in oil
chamber [l]
0.17
0.42