90
SECTION 13: Troubleshooting
Pump And Motor Problem Analysis (Continued)
Problem
Possible Cause
Check And Restore
Lo w or no water
production
(continued)
Well drawdown.
1. Install air line upon reinstalling unit if not already present for
measuring depth with tire pump and gage.
2. Measure dynamic (drawdown) level with string or resistance
meter.
3. Select different pump if appropriate.
Well collapsed.
1. Unit is pumping dirty or sandy water.
2. Lift with pump hoist, check pull weight and resistance
Pump selection.
1. Recheck operating conditions by comparing to pump curve.
2. Operate within ±5 percentage points of efficiency from B.E.P.
Hole in well piping.
1. Listen for sucking sound at well head when pump shuts off.
2. Well pipe empties when submersible pump is pulled from well.
Wrong rotation.
1. Three phase motor - exchange any two of the three leads in the
three phase motor starter panel.
2. Single phase motor - recheck motor and control panel wiring
diagrams. Change wiring as appropriate.
3. Proper rotation for motors for sub. and centrifugal pumps with
CW rotation is CCW when looking at the shaft end of the motor.
4. Make a visual flow check or observe flow meter. Amperage is not
a reliable indicator of wrong rotation.
Improper sizing.
Consult manufacturer’s performance charts or curves.
Ho le in distribution
piping.
1. Observe pressure loss with system shut off.
2. Look for wet spot or depression along pipe path.
Pu mp runs all the
time.
Drawdown.
1. Check for surging, irregular amperage readings with amprobe.
2. Look for bursts of air in water.
3. Listen for surging sounds in piping.
Control equipment.
1. Control equipment incorrectly selected or installed.
2. Welded electrical contact points.
3. Pressure switch supply pipe/tube plugged with rust/scale/ice.
Hazardous pressure and risk of explosion and
scalding. If pump is running continuously at no flow (with discharge
shut off), water may boil in pump and piping system. Under steam
pressure, pipes may rupture, blow off of fittings or blow out of pump
ports and scald anyone near.
Summary of Contents for P42B0007A2-01
Page 1: ...pentek Electronics Manual Installation Operation Maintenance WWW PUMPS COM ...
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