Pump Cleaning And Visual Inspection; Power Cables; Spare Parts; Contaminated Pumps And Service - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

9.5 Pump cleaning and visual inspection

A simple maintenance measure is to clean the pumps at regular
intervals. Lift the pumps out of the wet pit and clean the pumps on
site. Hose down the pump externally using a high-pressure jet
cleaner at maximum 100 bar. Remove caked dirt from the motor
to ensure good heat conductivity. A mild detergent approved for
disposal into the sewage system may be used. The pumps may
be scrubbed, using a soft brush, if necessary.
Visual inspection of the pump must include the following points:
• Search for cracks or other external damage.
• Check the lifting bracket and lifting chain for wear and
corrosion.
• Inspect the power cables for cracks or lacerations in the
sheath, for kinks or for other damage.
• Inspect visible parts of the cable entries for cracks.
• Check that the cables are firmly connected to the motor top
cover.
• Check all visible screws for self-loosening and tighten, if
necessary.
The pumps are fitted with a vent valve at the top of the cooling
jacket. The valve may be removed and cleaned, if necessary.
Clean the vent hole before refitting the valve after cleaning.

9.6 Power cables

Use only cables which are approved by the manufacturer and
suitable for the cable entry as to diameter, number of conductors,
conductor cross section and sheath material.
The explosion proof submersible motors must be
equipped with flexible cables, HD516, rated for extra
hard usage, approved by the manufacturer and
FM
suitable for the cable entries as to the diameter,
number of conductors, conductor cross section and
sheath material.
9.6.1 Cable entries
Secure the cable entries to the motor top cover by tightening the
screws evenly one by one until the cable entries are lying flat
against the top cover.
The minimum bending radius for cables can be read in the
following table:
Cable type Cable size
4 x 70 mm
4 x 95 mm
Power cables 4 x 120 mm
4 x 150 mm
4 x 185 mm
3 x 70 + 3 x 35/3
Power cables (EMC) 3 x120 + 1 x 70
3 x 185 + 1 x 95
10 x 1.5 mm
Control cables
18 x 1.5 mm
30
Min. bending
radius
[in (cm)]
2
10.6 (27)
2
12.2 (31)
2
13.4 (34)
2
15 (38)
2
16.5 (42)
8.3 (21)
24 (61)
29.5 (75)
2
4.7 (12)
2
9.8 (25)

9.7 Spare parts

Damaged motor parts must always be replaced by new and
approved parts. Motor parts must not be reconditioned by
machining, re-tapping, welding, etc.

9.8 Contaminated pumps and service

CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean water and
rinse the pump parts in water after dismantling.
If a pump has been used for a liquid which is injurious to health or
toxic, the pump will be classified as contaminated.

9.8.1 Sending pump to service

If you request Grundfos to service the product, contact Grundfos
with the following details about the pumped liquid before returning
the pump for service. Otherwise Grundfos can refuse to accept
the product for service.
Details for service:
• customer ID and/or installation ID, and contact information
• pump type and type designation
• type of malfunction or fault
• pumped liquid
• frequency converter, if used
• level switch type, if used
• control panel information, if available.
Costs of returning the product are to be paid by the customer.