Xylem VTP2006 Series VTP – Vertical Turbine Pumps User Manual download pdf (Page 28)

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 pages 19 or 21.

C. Low voltage supplied to Check whether driver wiring is

electric driver correct and receiving 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

stage impeller column.

F. Static lift too high Check the dynamic water level in

well. Consult factory for adding

stages or increase impeller diameter.

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 lowering the bowl

assembly by adding column.

C. Impellers adjusted too high See pages 19 or 21.

D. Air or gas in the water 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.

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.

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Xylem VTP2006 Series VTP – Vertical Turbine Pumps User Manual Page 28

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