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c)
Removing the impeller and especially the shaft seal, if it should ever be necessary, must be left to a mechanic.
d)
The motor should never be opened, even by an electrician, outside a workshop. Measurements of insulation,
continuity and winding resistance can be made from the end of the cable.
e)
Reliability can be of the essence where LB and HS pumps are concerned, in spite of their small size, e.g. to protect
important machinery or valuable goods from flooding. In this case check at least once a year or every 3000 hours
whether insulation between earth lead and the other two leads is over 20 M Ohm. The oil of the seal chamber
should be replaced by a mechanic. If insulation drops sharply or to 10 M Ohm, or if the oil is milky or contains water
drops, repair or replacement of the pump is needed.
f)
Freezing conditions may damage the pump.
TROUBLE SHOOTING
CONDITION OF DISORDER
Pump fails to start
Pump starts but stops
Pump´s head and flow are lower
than originally
Pump generates noise or vibration
Cleaning of float set (OM(A), POMA):
1. Disconnect pump from power source.
2. The tube in which the float can move up and down, has 4 slits
at the top. They divide the top of the tube into 2 rigid wide
tongues and two flexible narrow tongues. This makes it
possible to pinch the pair of flexible narrow tongues between
thumb and forefinger.
3. When this is done, the tube can be gently withdrawn from its
holder by turning the tube to the right, i.e. clockwise when
seen from above, and lowering it.
4. Clean inside of the tube, tube strainer, float and guide wire.
Pump is new or has been repaired and tested
If there is a level control, check whether it is calling for the pump to start.
Check by means of a multimeter or portable lamp or some electric tool,
whether power is available. Remove pump casing and check that
impeller can be rotated freely and without noise.
Check at pump cable´s end (never open the motor)
insulation value of earth lead (over 20 M Ohm), and continuity of winding.
Pump has been satisfactorily in use
Same, except that impeller needs more attention (stone, debris).
Motor windings or cable damaged. Do not open motor. Check as above.
Impeller blocked or choked.
Wrong voltage or frequency.
Voltage too low; check under load.
If power is provided by generating set, inexact frequency.
Liquid of excessive viscosity or density.
Wrong setting or thermal overload at power source.
Restriction in piping, or resistance in discharge conduit (too high, too long, too small,
too dirty inside).
Impeller worn, partially choked or severely narrowed by hard deposits.
Strainer or inlet blocked.
Pump draws air, or liquid is partly volatile or contains high level of gas in solution.
Impeller severely damaged, or bearing damaged. Repair at once.
Pump lying on its side and drawing a little air. High wear rate likely.
3
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