Set Troubleshooting - DAB 1 KVT Installations- Und Wartungsanleitungen

14.3. Below is a table with some suggestions ON REGULATING THE SET in the event of irregularities in operation.
FAULTS
A PUMP IN THE SET
DOES NOT PRIME.
A PUMP IN THE SET
DOES NOT START.
THE STOP BUTTON
DOES NOT STOP THE
PUMP
WHEN STOPPED, ONE
OR MORE PUMPS IN
THE SET TURN IN
INVERSE DIRECTION.
THE SET DOES NOT
SUPPLY THE
REQUIRED
CHARACTERISTICS.
POSSIBLE CAUSES
1. Suction pipe with insufficient diameter;
excessive use of couplings which cause sudden
variations in direction of the suction pipe;
siphon effect.
2. Suction pipe clogged.
3. Air infiltrations in the suction pipe of the
pump.
4. Foot valve clogged or blocked.
5. Interception valve on suction partly closed
1. Main motive power switch and/or main
auxiliary circuit switch off (in position "0").
2. Protection overload switches of the transformer
and/or of the auxiliary circuit faulty or tripped.
The Diesel motor pump starting batteries are
3. not efficient.
4. Electric circuit interrupted.
1. Important water leaks in the system, so the
pressure is not re-established above the
opening pressure of the pressure switch (about
1.5 bar above the closing pressure of the
pressure switch, that is the starting pressure of
the electropump and of the motor pump).
2. A jumper has been fitted on the terminals for
connecting the float for the priming tank (to be
installed in the event of suction above head).
1. The respective not return or foot valves do not
close well or are blocked.
2. The respective suction pipe is not airtight.
1. The set chosen is undersized for the charac-
teristics of the system.
2. Excessive water consumption for the flow rate
that can be supplied by the water supply source
(tank, well, mains, etc.)
3. Motors turning in inverse direction.
4. One or more pumps clogged.
5. Pipes clogged.
6. Foot valves clogged or blocked (set above
head).
7. Interception valves at suction and delivery
partly closed.
8. Air infiltrations in the suction pipes of the set
pumps.
ENGLISH
1.
2.
3.
4.
5.
1.
2.
3.
4.
1.
2.
1.
2.
1.
2.
3.
4.
5.
6.
7.
8.
59
REMEDIES
Check that the suction pipe is correctly
made, as indicated in the paragraph on
"Installation".
Clean it or change it.
Testing under pressure, check the
perfect seal in the couplings, the joins
and the pipes.
Clean it or change it.
Open it completely.
Switch them on, turning them to
position "1" and check that the two
green lights come on indicating that the
panel is live.
If faulty, change them.
If tripped, reset them.
Check the efficiency of the battery
chargers in the motor pump panel
(check absorption of the motor pump
panel with ammeters)
If the batteries are inefficient, change
them.
Use a tester to find the point of
interruption and repair it.
Check the joins, couplings and pipes.
Remove the jumper in the event of
suction below head.
Insert the float for the priming tank in
the event of suction above head.
Check seal and correct operation.
Check the seal, testing under pressure.
Replace it with one that suits the
required characteristics.
Increase the flow rate that can be
supplied by the water supply source.
Change it, performing the operation de-
scribed in the paragraph on "Starting".
Dismantle them and clean the pump
body and the impellers, ensuring that
they are in good condition.
Clean them or change them.
Clean them or change them.
Open them completely.
Testing under pressure, check the
perfect seal in the couplings, the joins
and the pipes.