Bedienungsanleitung Speroni CX (Seite 14 von 52) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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Problem How to check Remedy

1 Motor does

not start.

No noises

or vibrations

occur

2 Motor does

not start,

but generates

noises and

vibrations

A - Make sure that motor is wired up as

directed in the diagram inside the terminal

box cover.

B - The shaft is bound. Find out if due to loose

fan or mechanical obstructions on the

motor or the pump.

C - The sliding surface of mechanical seal is

stuck due to prolonged stoppage.

A - Correct any wrong

connections.

B - Remove cause of obstruction.

C - Correct seal by turning the

shaft - 1/4 turn with a pipe

wrench.

3 Pump

does not

provide

delivery

A - Pump has not been filled.

B - Pump has unprimed due to leaks in the

suction line.

C - With 3phase motors check for correct

direction of rotation.

D - The head required by the plant is higher

than that generated by the pump.

E - Foot valve clogged.

F - Suction lift too high.

G - Suction pipe too narrow.

A - Fill the pump. Prime it again.

B - Repair leaks. Fill and prime

again.

C - Interchange two supply leads.

D - Replace the pump with a

suitable one.

E - Clean foot valve.

F - See section “installation”.

G - Replace suction pipe with one

having diameter larger by 1/4”

or 1/2”.

A - Make sure that power supply

is connected.

B - Check for any blown fuses.

C - Check for open or dirty contacts in the

protection devices.

B - Replace fuse with new one.

Note: if the new fuse blows immediately

after, the motor or the cable are shorted,

either directly or the earth (faulty insulation).

C - Clean the part involved or

replace it with a new one.

4 Protection

trips

as machine

starts

A - One phase is missing.

B - As in 1B.

C - As in 1C.

D - Motor with faulty insulation; check phase

resistance and insulation to ground.

A - Reset the phase

B - As in 1B.

C - As in 1C.

D - Replace stator or the internal

earth cable.

8. Fault finding chart: problems, possible causes and remedies

INSTRUCTIONS FOR THE INSTALLATION AND USE OF ELECTROPUMPS

Problem How to check Remedy

5 Protection

trips

too often

6 Shaft

spins

with difficulty

A - Check for obstructions in the motor or the

pump.

B - As in 5D.

C - Check bearings for proper conditions.

A - As in 2B.

B - As in 5D.

C - Replace any faulty bearing.

A - Ascertain whether the protection device is

set to a value lower than the motor full load

requirements.

B - One phase is missing due to faults in

contacts or supply cable.

C - Liquid is viscous or its specific weight is

much higher than that of water.

D - Harsh rubbing occurs between sliding and

stationary parts.

A - Correct setting.

B - Clean and reset contact or

replace supply cable with new

one.

C - Reduce flow rate slightly by

adjusting the delivery sluice

valve accordingly. If this is not

acceptable, instal a more

powerful motor.

D - Remove cause of harsh

rubbing.

When stopped,

the pump runs

slightly in reverse

direction

A - Leaks or air locks in suction pipe. A - Correct leaks and read section

“installation”.

7 Pump

vibrates, runs

noisily;

flow rate

is uneven

A - Pump runs beyond rated capacity.

B - Pump or pipework not properly secured.

C - As in 3F.

D - As in 3G.

A - Reduce flow rate.

B - Secure any loose or improperly

secured part.

C - As in 3F.

D - As in 3G.

In pressure

boosting

applications the

pump starts and

stops too often

A - Pressure-switch setting is too limited.

B - Leaks in system.

A - Set pressure switch to wider

limits.

B - Eliminate leaks.

In pressure

boosting

applications, the

pump does not stop

A -

Max.-pressure setting in pressure switch

is too high.

B -

As in 9B

A - Reduce max-pressure setting

to lower value.

B - As in 9B.

8. Fault finding chart: problems, possible causes and remedies

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