Wiring And Grounding - Stur Pumps OSSI-MIX Mode D'emploi Et D'installation

en « Translation of the original instructions »
The ossi-mix should be installed in square or round tanks. For rectangular
tanks it is recommended to install two or more ossi-mix of
lower power or, alternatively, OMG ossi-mix combined with
mixer to prevent stagnation in an ossi-mix-free part of tank.
If the unit has been stored for an extended period, check the oil level in
the ossi-mix and if it has been previously used check that no impurities
and/or water are present (see the "maintenance" section).
Before connecting the power supply check manually that
the rotator can rotate freely.
WARNING: never carry this operation out when the unit is
connected to a power supply.
Check that the rotator can rotate freely with the unit resting on a flat
surface.
Suitably qualified experts must connect the power supply cable to the
control panel, which must have adequate thermal and electrical
protection. The experts will also check that correct clockwise rotation.
WARNING:
Rotation direction may also be checked visually. Maintain a
distance of at least 1 m. From moving parts, wear adequate
protective clothing and never touch the machinery.

5.2 WIRING AND GROUNDING

Never open the ossi-mix motor. Always call in a qualified
expert if necessary.
Qualified personnel must carry out all wiring and grounding in
strict accordance with all the relevant safety norms and regulations.
Check that the voltage on the ossi-mix nameplate corresponds to the
power supply voltage. Because the ossi-mix motor is submerged
grounding is essential.
The ground wire is yellow/green. All yellow/green grounding wires must
be connected to the unit's grounding circuit before being connected to
other conductors, and they must be the last to be disconnected during
disassembly. The free ends of the cables must never be wet or submerged
in water or liquids. Remember that power will peak to six times as much
as usual strength during direct starting and double for star-delta starting;
therefore line fuses must be large enough to withstand this peaking.
Control panel
The control panel may be a normal overload cut-out for direct
starts or an overload cut-out breaker for star-delta starts.
Direct starting: set the overload cut-out to a maximum or lower
level to that specified on the nameplate.
Star-delta starting: regulate the thermal breaker to max 0.58 times the
nominal input specified on the nameplate.
If the overload cut-out triggers while the ossi-mix is running, check the
fuses before trying to start the motor again.
Never force the motor to run without identifying and correcting the fault.
If necessary consult a technician.
Rotation direction
The rotation direction must be checked each time the motor is
started or there has been a drop in phase or voltage. The ossi-
mix rotator should rotate to the right, looking at the ossi-mix
from above (the unit may be powered up to check rotation direction
before being submerged). If the rotation direction is incorrect, air suction
will not occur and the motor will overcharge with a greater absorption of
electricity than usual. If the rotation direction is incorrect the ends of the
power supply lines should be inverted on the control panel.
6. OPERATION AND RUNNING
6.1 START UP
If start up is unsuccessful (start group fails to peak), do not try repeatedly,
this only risks damaging the motor. Identify and rectify the cause of the
dysfunction.
For indirect start up the start up transient should be brief and not last
more than a few seconds.
6.2 RUNNING AND INSPECTION
WARNING: Once the submersible ossi-mix has been installed
it does not require any particular maintenance, but to ensure
long-term smooth running the ossi-mix's hydraulics should be
periodically inspected to make sure that it is not obstructed by any solids
or strands of solid material present in the liquid. Carry out preventive
inspections and maintenance every year. Check:
-electrical insulation of the motor and power supply cable (see "Wiring
and grounding");
-the condition of the oil (see the "Maintenance" section);
-the hydraulics (see the "Maintenance" section).
Check the electrical panel, if present. If it is not working correctly
proceed as instructed in this manual.
6.3 MAINTENANCE
Routine maintenance and any repairs to the unit must be carried out by
qualified personnel using the correct tools and equipment who have
studied and understood the contents of this manual and any other
documentation enclosed with the unit.
Unscheduled maintenance must be carried out by an authorized repair
shop.
Seal check
Make sure that both seals are fully waterproof and there are no
infiltrations. Make sure that no liquid has found its way into the stator
housing or oil tank through other channels. If the ossi-mix or seal is new,
inspect after it has been running for a week. Under normal operating
conditions the ossi-mix should be inspected at least once a year. If
operational conditions are particularly harsh inspections should be carried
out more frequently.
Oil tank inspection
Raise the ossi-mix on blocks and remove the inspection screw
with a spanner, draining the oil off into a container. If the oil is
unadulterated the seal is intact. Make sure that there has been no
significant decrease in the amount of oil. Pour the oil back into the tank.
If it is a yellowish-grey color and viscous or there is water present it
means that the seal or the bearing is damaged and requires replacing. In
this case the ossi-mix should be taken to a workshop for a general
overhaul. Fill the tank with sealing oil.
Tighten the tank's drainage and filling screws to prevent infiltration.
Replace the screw washers.
These operations should be carried out by an authorized repair shop.
General overhaul
Because of the presence of ball bearings the ossi-mix requires a general
overhaul every three years. Disconnect the power supply and disconnect
the power supply cable from the nearest connector block or control panel.
Remove the ossi-mix from the tank using its extractor chain; nothing
needs unscrewing. Clean the ossi-mix with a water jet. The ossi-mix can
now be transported to a repair shop for overhaul. Dismantle the ossi-mix
completely, clean all the sealed surface and check that they are intact.
Substitute any damaged parts; clean and grease the ball bearings. Replace
the lower mechanical seal if water or oil and water have penetrated into
the stator housing.
These operations should be carried out by qualified experts, by an
authorized repair shop.
Motor insulation check
It is advisable to check motor insulation with a 500 V megger during
overhaul.
Insulation should be over 1 megaohm both between the various phases
and between each phase and the ossi-mix casing.
Lubrication
The ossi-mix ball bearing are the self-lubricating and therefore
do not require periodic greasing. However they should be
checked for wear periodically.
These operations should be carried out by qualified experts, by an
authorized repair shop.
Unscrew the oil cap, drain the oil off into a clean container and inspect it.
Refill the oil tank with oil. Replace the cap; it is advisable to substitute
the cap's o-ring before replacement.
Quantities of oil in the OMG, OMG/L ossi-mix at page 3.
Rotor and suction cover check
If the volume of air decreases:
-Check that the rotor and suction cover are free from obstructions and
remove any detritus;
-Substitute the rotor and/or suction cover and/or rotor seal bearing. If
these are damaged please contact an authorized repair shop.
Air intake check
Check that the air intake pipe is not obstructed or damaged, which may
cause motor overload. Check that the regulation valve, when present, is in
good condition. Check that the silencer, when present, is dust-free. If it is
clogged with dust, wash it. All the steps detailed should be carried out
periodically to ensure the ossi-mix's long-term efficiency.
6.4 LAY UP
See the section on "Storage and movement".
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