Berkley B3TRKS, B4ZRKS, B2ZRKL, B2XRKS Troubleshooting, Electrical Drive Pumps, Maintenance

Maintenance

Troubleshooting

Electrical Drive Pumps

PROBABLE CAUSE

SYMPTOM

GROUP I

GROUP II

GROUP III

ELECTRICAL

MECHANICAL

SYSTEM

A

B

C

D

E

F

G

H

I

A

B

C

D

E

F

A

B

C

Pump runs, but no water delivered

X

X

X

X

Not enough water delivered

X

X

X

X

X

X

X

X

Not enough pressure

X

X

X

X

X

X

X

X

Excessive vibration

X

X

X

X

X

X

Abnormal noise

X

X

X

X

X

X

X

Pump stops

X

X

X

X

X

X

X

X

Overheating

X

X

X

X

X

X

X

X

X

CAUSE

CORRECTIVE ACTION

I. ELECTRICAL

A. No voltage in power system

Check phase-to-phase on line side of starter contactor.

Check circuit breaker or fuses.

B. No voltage on one phase

Check phase voltage on line side of starter contactor. Isolate open circuit

(Three Phase Units)

(circuit breaker, fuse, broken connections, etc.)

C. Low voltage at motor

Running voltage across each leg of motor must be ±10% of nominal

voltage shown on nameplate.

D. Motor leads improperly grouped

Refer to lead grouping diagram on motor nameplate.

for voltage

E. Control failure

Check control device, starter contactor, H-O-A selector switch, etc.,

for malfunction.

F. Thermal overload switch open

Check phase-to-phase on line side of starter contactor.

G. Installation failure

Check motor or windings to ground with megohmmeter.

H. Open windings

Check leg-to-leg with ohmmeter.

I. Frequency variation

Check frequency of power system. Must be less than 5% variation from

motor nameplate rating.

II. MECHANICAL

A. Flow through pump completely or

Locate and remove obstruction. Refer to Repair Instructions

partially obstructed

for disassembly.

B. Wrong direction of rotation

Reverse rotation of three phase motor by interchanging any two leads.

See manufacturer’s Instructions for reversing single phase motor.

C. Pump not primed

Reprime. Inspect suction system for air leaks.

D. Internal leakage

Check impeller for wear of controlled clearances (See Repair Instructions).

E. Loose parts

Inspect. Repair.

F. Stuffing box not properly adjusted

Adjust gland.

III. SYSTEM

A. Pressure required by system at design

Compare pump pressure and flow rate against pump characteristic curve.

flow rate exceeds pressure rating of pump

Check for closed or partially closed valve in discharge piping system.

Reduce system pressure requirement. Increase pressure capability of pump.

B. Obstruction in suction piping

Locate and remove obstruction.

C. Pressure rating of pump exceeds pressure

Compare pump pressure and flow rate against pump characteristic curve.

requirement of system at design flow rate

Inspect discharge piping system for breaks, leaks, open by-pass valves, etc.

If necessary, reduce flow rate by partially closing discharge valve.

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