Crane Barnes 3SE3024L, Installation And Operation Manual

13

TROUBLE SHOOTING

CAUTION !

 Always disconnect the pump from the electrical power source before handling.

If the system fails to operate properly, carefully read instructions and perform maintenance recommendations.
If operating problems persist, the following chart may be of assistance in identifying and correcting them:

MATCH “CAUSE” NUMBER WITH CORRELATING “CORRECTION” NUMBER

.

NOTE:

 Not all problems and corrections will apply to each pump model.

PROBLEM

CAUSE

CORRECTION

Pump will not run

1.

 Poor electrical connection, blown fuse, 

tripped breaker or other interruption of power, 
improper power supply.

2.

 Motor or switch inoperative (to isolate 

cause, go to manual operation of pump).

2a.

 Float movement restricted.

2b.

 Switch will not activate pump or is defective.

2c.

 Defective motor

3.

 Insuffi cient liquid level.

1. Check all electrical connections for 
security. Have electrician measure current 
in motor leads, if current is within ±20% 
of locked rotor Amps, impeller is probably 
locked. If current is 0, overload may be 
tripped. Remove power, allow pump to cool, 
then recheck current.
2a. Reposition pump or clean basin as 
required to provide adequate clearance for 

fl oat.
2b. Disconnect level control. Set ohmmeter 
for a low range, such as 100 ohms full scale 
and connect to level control leads. Actuate 
level control manually and check to see that 
ohmmeter shows zero ohms for closed switch 
and full scale for open switch. (Float Switch).
2c. Check winding insulation (Megger Test) 
and winding resistance. If check is outside 
of range, dry and recheck. If still defective, 
replace per service instructions.
3. Make sure liquid level is at least equal to 
suggested turn-on point.
4. Recheck all sizing calculations to 
determine proper pump size.
5. Check discharge line for restrictions, 
including ice if line passes through or into 
cold areas.
6. Remove and examine check valve for 
proper installation and freedom of operation.
7. Open valve.
8. Check impeller for freedom of operation, 
security and condition. Clean impeller and 
inlet of any obstruction.
9. Loosen union slightly to allow trapped air 
to escape.Verify that turn-off level of switch 
is set so that the suction is always fl ooded. 
Clean vent hole.
10. Check rotation. If power supply is three 
phase, reverse any two of three power supply 
leads to ensure proper impeller rotation..
11. Repair fi xtures as required to eliminate 
leakage.
12. Check pump temperature limits & fl uid 
temperature.
13. Replace portion of discharge pipe with 
fl exible connector.
14. Turn to automatic position.
15. Check for leaks around basin inlet and 
outlets.
16. Inspect motor shaft runout. Inspect 
bearings. Replace as necessary.

Pump will not turn off

2a. Float movement restricted.
2b. Switch will not activate pump or is defective.
4. Excessive infl ow or pump not properly sized 
for application.
9. Pump may be airlocked
14. H-O-A switch on panel is in “HAND” position

Pump hums but does not run

1. Incorrect voltage
8. Impeller jammed or loose on shaft, worn or 
damaged, impeller cavity or inlet plugged.

Pump delivers insuffi cient capacity

1. Incorrect voltage.
4. Excessive infl ow or pump not properly sized 
for application.
5. Discharge restricted.
6. Check valve stuck closed or installed backwards.
7. Shut-off valve closed.
8. Impeller jammed or loose on shaft, worn or 
damaged, impeller cavity or inlet plugged.
9. Pump may be airlocked.
10. Pump running backwards

Pump cycles too frequently or runs 
periodically when fi xtures are not in use

6. Check valve stuck closed or installed 
backwards.
11. Fixtures are leaking.
15. Ground water entering basin.

Pump shuts off and turns on indepen-
dent of switch, (trips thermal overload 
protector). 

CAUTION!

  Pump may start 

unexpectedly. Disconnect power supply.

1. Incorrect voltage.
4. Excessive infl ow or pump not properly sized 
for application.
8. Impeller jammed, loose on shaft, worn or 
damaged, impeller cavity or inlet plugged.
12. Excessive water temperature. 
(internal protection only)

Pump operates noisily or vibrates 
excessively

5. Debris in impeller cavity or broken impeller
10. Pump running backwards
13. Piping attachments to buiding structure too 
rigid or too loose.
16. Worn bearings, motor shaft bent.