Pump Cleaning And Inspection; Power Cables; Spare Parts; Contaminated Pumps And Service - Grundfos S Serie Manual Del Usuario

10.5 Pump cleaning and inspection

A simple maintenance measure is to clean the pumps at regular
intervals. Lift the pumps out of the wet pit and clean them on site.
Hose down the pump externally by using a high-pressure jet
cleaner at a maximum of 100 bar. Remove caked dirt from the
motor to ensure proper heat conductivity. A mild detergent
approved for disposal into the sewage system may be used. The
pumps may be scrubbed, by using a soft brush, if necessary.
Inspection of the pump must include the following:
•
Search for cracks or other external damage.
• Check the lifting bracket and lifting chain for wear and corrosion.
• Make sure the power cables are not damaged.
• Check the cable entries for cracks.
• Make sure the cables are firmly connected to the motor top
cover.
• Check all the 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.

10.6 Power cables

Use only suitable and manufacturer-approved cables.
The explosion-proof submersible motors must be
equipped with flexible cables, HD516, rated for extra hard
FM
usage, approved by the manufacturer and suitable for the
cable entries.
10.6.1 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 the cables is indicated in the table
below.
Cable size
Cable type
[pcs. x AWG (mm
4 x 2/0 AWG (70)
4 x 3/0 AWG (95)
4 x 4/0 AWG (120)
Power cables
4 x 300MCM AWG
(150)
4 x 350MCM AWG
(185)
3 x 2/0 AWG (70) +
3 x 2 AWG/3 (35/3)
3 x 3/0 AWG (120) +
Power cables (EMC) 1 x 2/0 AWG (70)
3 x 350MCM AWG
(185) + 1 x 3/0 AWG
10 x 16 AWG (1.5)
Control cables
18 x 16 AWG (1.5)
28
Min. bending
radius
2
)]
[in (cm)]
10.6 (27)
12.2 (31)
13.4 (34)
15 (38)
16.5 (42)
8.3 (21)
24 (61)
29.5 (75)
(95)
4.7 (12)
9.8 (25)

10.7 Spare parts

Damaged motor parts must always be replaced by new and
approved ones. Motor parts must not be reconditioned.

10.8 Contaminated pumps and service

CAUTION
Biological hazard
Minor or moderate personal injury
‐
Flush the pump thoroughly with clean water and rinse
the pump parts after dismantling.
The pump is classified as contaminated, if it is used for toxic or
contagious liquid.
Before returning the product for service, contact Grundfos with
details about the pumped liquid. Otherwise, Grundfos can deny to
service the product. Any application for service must include details
about the pumped liquid.
Clean the product in the best possible way before returning it.