DAB S4, Instruction For Installation And Maintenance

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ENGLISH
14
FAULTS CHECKS (possible causes) REMEDIES
3. The motor
protection is
tripped after
long periods of
apparently
normal
operation
A. Check that the voltage is sufficient and
that all the phases are present
B. Check for excessive torque forces
(scraping between rotating and fixed
parts, presence of sand, etc.)
A. Restore the missing phase
B. Eliminate the cause of friction or clean
the pump to remove any obstructions
4. Motor running
but flow rate is
not sufficient
A. In the three-phase versions check the
direction of rotation
B. Check that the pipes are not partially
obstructed
C. Check that the pump flow rate is lower
than that of the well
D. Check the state of wear of the pump
A. Invert any two phase leads
B. Eliminate the obstructions
C. Replace the pump with one with a
lower flow rate
D. Overhaul the pump
5. Motor running
but pump does
not deliver
A. Check that there has not been an
excessive lowering of the level of the well
resulting in possible dry running
B. Check that the required head is not
higher than that of the pump
C. In the three-phase versions check the
direction of rotation
D. Pump blocked by impurities
A. Wait for the natural level to be
restored or lower the level of the well.
Install adequate protection against dry
running
B. Replace the pump with one with
suitable characteristics
C. Invert two phase leads
D. Clean the pump, grid or pipes
6. The pressure is
insufficient
A. Check for leaks in the system
B. In the three-phase version check the
direction of rotation
C. Check the state of wear of the pump
A. Take action to eliminate leaks
B. Invert two phase leads
C. Overhaul the pump
7. Pump starts
and stops too
frequently
A. Check for leaks in the system
B. Check the correct operation of the check
valve
C. Check the efficiency of the pressure
switch, if used
D. Check that the tank is of sufficient size
E. Check the position of the probes against
dry running, if used
A. Take action to eliminate leaks
B. Repair or replace the valve
C. Repair or replace the pressure switch
D. Replace it with one of adequate
capacity
E. Reposition the probes to have longer
running times