Troubleshooting - Xylem Bell & Gossett VTP Serie Manual De Instrucciones

TROUBLE
1. Pump does not start
2. No liquid delivered
3. Not enough liquid
4. Not enough pressure
5. Pump works for a while
and quits
28

TROUBLESHOOTING

PROBABLE CAUSE
A. Electrical circuit open or not
completed
B. Improper lateral adjustment.
Impeller on bottom.
C. Low voltage supplied to
electric driver
D. Defective motor
A. Discharge valve closed
B. Speed is too low
C. Wrong rotation
D. Obstruction in liquid passage
E. Water level in the well is below
1 stage impeller
st
F. Static lift too high
G. Field head requirement greater
than design head
H. Damaged bowl assembly;
Broken or disconnected shaft
I. Driver with reduced voltage, or
reduced current starting does
not come up to speed
A. Same as items 2-A thru 2-G
B. Cavitation
C. Impellers adjusted too high
D. Air or gas in the water
E. Excessive pump wear
See not enough liquid.
A. Excessive horsepower required.
B. Pumping higher viscosity or
specific gravity liquid than
designed for.
C. Mechanical failure of
critical parts
D. Suction strainer clogged
E. Misalignment
F. Break suction
REMEDY
Check circuit and correct.
Reset impeller adjustment,
See pages 19 or 21.
Check whether driver wiring is
correct and receiving full voltage.
Consult factory.
Be sure the discharge valve is in
full open position.
Check if driver is directly across
the line and receiving full voltage.
Check for CCW rotation when
viewed from above. Check
engagement of motor coupling.
Pull pump, inspect suction
strainer, impeller and bowls.
Increase pump setting by adding
column.
Check the dynamic water level in
well. Consult factory for adding
stages or increase impeller diameter.
Check system friction loss.
Increase discharge piping size.
Consult factory for adding stages
or increase impeller diameter
Pull pump and repair all
damaged components.
Check RPM, voltage and amp's.
Same as items 2-A thru 2-G.
Insufficient NPSH available.
Consider lowering the bowl
assembly by adding column.
See pages 19 or 21.
If successive starts and stops
does not remedy, lower pump if
possible, or close discharge
valve to maintain well pumping
level at a lower GPM.
Pull pump and repair as required.
See not enough liquid.
Use larger driver. Consult factory.
Test liquid for viscosity and
specific gravity.
Check bearings and impellers for
damage. Any irregularities in
these parts will cause a drag
on the shaft.
Pull pump and clean the strainer.
Realign pump and driver.
Check dynamic water level in the
well. Lower bowl assembly by
adding column.