Xylem IMDWT R02 Model DWT Deep Well Turbine Pumps - Manual (Page 22)

22
TroUBLESHooTING
TroUBLE ProBABLE CAUSE rEMEdY
1. Pump does not start A. Electrical circuit open or not Check circuit and correct.
completed
B. Improper lateral adjustment. Reset impeller adjustment,
Impeller on bottom. See page 16.
C. Low voltage supplied to Check whether driver wiring is
electric driver correct and receives full voltage.
D. Defective motor Consult factory.
2. No liquid delivered A. Discharge valve closed Be sure the discharge valve is in
full open position.
B. Speed is too low Check if driver is directly across
the line and receiving full voltage.
C. Wrong rotation Check for CCW rotation when
viewed from above. Check
engagement of motor coupling.
D. Obstruction in liquid passage Pull pump, inspect suction
strainer, impeller and bowls.
E. Water level in the well is below Increase pump setting by adding
1 st stage impeller column.
F. Static lift too high Check the dynamic water level in
well. Consult factory for adding
stages or increase impeller diam.
G. Field head requirement greater Check system friction loss.
than design head Increase discharge piping size.
Consult factory for adding stages
or increase impeller diameter
H. Damaged bowl assembly; Pull pump and repair all
Broken or disconnected shaft damaged components.
I. Driver with reduced voltage, or Check RPM, voltage and amp’s.
reduced current starting does
not come up to speed
3. Not enough liquid A. Same as items 2-A thru 2-G Same as items 2-A thru 2-G.
B. Cavitation Insufficient NPSH available.
Consider to low the bowl
assembly by adding column.
C. Impellers adjusted too high See page 16.
D. Air or gas in the water If successive starts and stops
does not remedy, low pump if
possible, or close discharge
valve to maintain well pumping
level at a lower GPM.
E. Excessive pump wear Pull pump and repair as required.
4. Not enough pressure See not enough liquid. See not enough liquid.
5. Pump works for a while A. Excessive horsepower required. Use larger driver. Consult factory.
and quits B. Pumping higher viscosity or Test liquid for viscosity and
specific gravity liquid than specific gravity.
designed for.
C. Mechanical failure of Check bearings and impellers for
critical parts damage. Any irregularities in
these parts will cause a drag
on the shaft.
D. Suction strainer clogged Pull pump and clean the strainer.
E. Misalignment Realign pump and driver
F. Break suction Check dynamic water level in the
well. Lower bowl assembly by
adding column.