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SYMPTOM
Pump runs, but no water delivered
Not enough water delivered
Not enough pressure
Excessive vibration
Abnormal noise
Pump stops
Overheating
CAUSE
I. ELECTRICAL
A. No voltage in power system
B. No voltage on one phase
(Three Phase Units)
C. Low voltage at motor
D. Motor leads improperly grouped
for voltage
E. Control failure
F. Thermal overload switch open
G. Installation failure
H. Open windings
I. Frequency variation
II. MECHANICAL
A. Flow through pump completely or
partially obstructed
B. Wrong direction of rotation
C. Pump not primed
D. Internal leakage
E. Loose parts
F. Stuffing box not properly adjusted
III. SYSTEM
A. Pressure required by system at design
flow rate exceeds pressure rating of pump
B. Obstruction in suction piping
C. Pressure rating of pump exceeds pressure
requirement of system at design flow rate
BE839
Maintenance
Troubleshooting
Electrical Drive Pumps
GROUP I
ELECTRICAL
A
B
C
D
E
X
X
X
X
X
X
X
X
X
X
X
X
Check phase-to-phase on line side of starter contactor.
Check circuit breaker or fuses.
Check phase voltage on line side of starter contactor. Isolate open circuit
(circuit breaker, fuse, broken connections, etc.)
Running voltage across each leg of motor must be ±10% of nominal
voltage shown on nameplate.
Refer to lead grouping diagram on motor nameplate.
Check control device, starter contactor, H-O-A selector switch, etc.,
for malfunction.
Check phase-to-phase on line side of starter contactor.
Check motor or windings to ground with megohmmeter.
Check leg-to-leg with ohmmeter.
Check frequency of power system. Must be less than 5% variation from
motor nameplate rating.
Locate and remove obstruction. Refer to Repair Instructions
for disassembly.
Reverse rotation of three phase motor by interchanging any two leads.
See manufacturer's Instructions for reversing single phase motor.
Reprime. Inspect suction system for air leaks.
Check impeller for wear of controlled clearances (See Repair Instructions).
Inspect. Repair.
Adjust gland.
Compare pump pressure and flow rate against pump characteristic curve.
Check for closed or partially closed valve in discharge piping system.
Reduce system pressure requirement. Install pump with higher capacity.
Inspect discharge piping system for breaks, leaks, open by-pass valves, etc.
Locate and remove obstruction.
Compare pump pressure and flow rate against pump characteristic curve.
Install smaller diameter impeller
PROBABLE CAUSE
MECHANICAL
F
G
H
I
A
B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
CORRECTIVE ACTION
GROUP II
GROUP III
SYSTEM
C
D
E
F
A
X
X
X
X
X
X
X
X
X
X
X
X
X
B
C
X
X
X
X
X
X
X
X
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