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1.3 Safety
Installation of products in pits must be carried out by
specially trained persons.
Work in or near pits must be carried out according to
local regulations.
DANGER
Electric shock
Death or serious personal injury
- It must be possible to lock the main switch in
position 0. Type and requirements as specified in
EN 60204-1, 5.3.2.
Persons must not enter the installation area when the
FM
atmosphere is explosive.
For safety reasons, all work in pits must be supervised by a
person outside the pump pit.
We recommend that you carry out all maintenance
and service work when the product is placed outside
the pit.
Pits for submerged sewage and wastewater pumps may contain
sewage or wastewater with toxic and/or disease-causing
substances. Therefore, all persons involved must wear
appropriate personal protective equipment and clothing, and all
work on and near the pump must be carried out under strict
observance of hygienic regulations in force.
DANGER
Crushing hazard
Death or serious personal injury
- Always lift the product by its lifting bracket or by
means of a forklift truck if the product is fixed on a
pallet. Do not lift the product by the power cable.
2. Maintaining the product
Check pumps running normal operation every 3000 operating
hours or at least once a year.
If the pumped liquid is very muddy or sandy, check the pump at
shorter intervals.
Check the following points:
•
Power consumption
See pump nameplate.
•
Motor liquid level and liquid condition
When the pump is new or after replacement of the shaft seal,
check the motor liquid level and water content after one week
of operation.
The motor liquid must be changed after 3000 operating hours
or once a year.
Use SML3 motor liquid, product number 795898 [5.25 qt (5 l)].
See section
2.3 Changing the motor
•
Pump parts
Check the impeller, pump housing, etc. for possible wear.
Replace defective parts.
See section
4. Dismantling and assembling the product
dismantling and assembly of the pump.
•
Ball bearings
Check the shaft for noisy or heavy operation by turning the
shaft by hand. Replace defective ball bearings.
See section
4. Dismantling and assembling the
In case of defective ball bearings or poor motor function, a
complete overhaul of the pump is usually required.
This work must be carried out by Grundfos or an authorized
service centre.
FM
Defective bearings may reduce the Ex safety.
On Ex pumps, the ball bearings may only be
FM
replaced by a FM-approved service centre.
•
O-rings and similar parts
During service or replacement, make sure that the grooves for
O-rings and seal faces have been cleaned before the new
parts are fitted.
Never reuse used rubber parts.
Explosion-proof products must be checked by a FM-
FM
approved service centre once a year.
•
Measuring the insulation resistance
Megging must take place at a voltage of minimum 500 V. The
insulation resistance measured must be minimum 50 kΩ.
liquid.
for
product.
3
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