POMPE ROTOMEC RS Serie Notice D'instructions page 19

REPLACEMENT OF THE IMPELLER
DISASSEMBLING
1 - Take away the securing screws fixing the motor to the
pump and extract it.
2 - Place the motor horizontally on a table locking it by two
wedges in order to avoid rolling.
3 - Lock the impeller by release pliers or a by a strong scrwdriver inserted between the blades, unscrew the locking
screw of the impeller and take the washer away; in case of blocked impeller beat it a rubber hammer.
4 - Remove the shaft key.
5 - For extracting the impeller, when necessary, make lever on the rear part of the same by two suitable levers.
REASSEMBLING
Check that shaft
end is clean and undamaged, in case of eventual damages grind by fine grain emery cloth the shaft end, the
impeller hole and the key. Grease the shaft end and assemble the key in its seat. Check that the hole slot of the impeller is in line with
the impeller by release pliers or by a screwdriver between the blades and tighten the securing screw.
Lift the motor, place it vertically on the pump body and tighten the securing screws.
The more frequent failures in electric submersible pumps are located in the electric plant, feeding cable and devices for the automatic
functioning of the installation. For failure investigation on the electric plant it's necessary: a universal instrument, a testing lamp and the
electric diagram of the equipment.
WARNING !
Any intervention on the electric plant must be carried out perfectly by competent personnel
and complying with local safety regulations.
CAUTION !
Failure investigation must be carried
out perfectly by competent personnel
and complying
regulations.
The diagram reported herebelow will help failure investigation when pump and installation have previously worked satisfactory
THE ELECTRIC PUMP DOES'NT START.
Control equipment signals failur
No
Is the pump starting in "manual"?
No
Is there a voltage lack?
No
Apply an authorized center shop.
FAILURE INVESTIGATION
with local safety
Yes
Yes
Yes
CAUTION !
Should the impeller be weared it
could have cutting edges and blades;
take care to use suitable working
gloves.
CAUTION !
Before starting the pump check that
there is no people nerby.
Check that pump is cooled by the liquid and
that impeller turns free. Check that thermal
protectione is regularly functionning.
Check that :
1 - Level control switches are regularly functionning.
2 - Control equipment is regularly functionning.
3 -Thermal relays are regularly functionning.
Check that:
1 - Main switch is on.
2 - Voltage is connected.
3 - All phases of feeding cable are under voltage.
4 - Motor cable is not interrupted.
5 - Fuses have continuyti and are tightened.
19
.