Fault: The Machine Does Not Run Smoothly And Is Noisy; Fault: Mechanical Shaft Seal Leaks, Sealing Chamber Monitor Reports Fault And Switches The Machine Off - Wilo EMU FA+HC20.1 Series Installation And Operating Instructions Manual

Cause
Excessive decrease in the water table during
operation
Table 9-4: The machine runs, but not at the stated operating levels
Cause
Machine is running in an impermissable oper-
ation range
The suction port, strainer and/or impeller/pro-
peller is blocked
The impeller is impeded
Inadmissible levels of gas in the pumped liquid
Two-phase operation
Incorrect direction of rotation
Signs of wear
Defective motor bearing
The machine is installed with mechanical
strain
Table 9-5: The machine does not run smoothly and is noisy
(Sealing chamber monitoring is optional, and is not available for all types. For details on this, see the
order confirmation or the electrical terminal connection plan.)
Cause
Condensation build-up due to lengthy stor-
age and/or temperature fluctuation
Expansion tank (optional for polder pumps) is
too high
Increased leakage when running in new
mechanical shaft seals
Defective sealing chamber cables
Mechanical shaft seal is defective
Table 9-6: Mechanical shaft seal leaks, sealing chamber monitor reports fault and switches the machine off
E:\shares\Baprod\BA\subtec_m\general\us\troubleshooting.fm
Remedy
Check the supply and capacity of the system,
and inspect the level control settings and
function
Remedy
Check the operational data of the machine
and correct if necessary and/or adjust the
operating conditions
Clean the suction port, strainer and/or impel-
ler/propeller
Switch off the machine, secure it against
being switched on again and free the impeller
Contact the factory
Have a specialist inspect the connection and
correct it as necessary
Replace 2 phases on the mains supply
Replace worn parts
Contact the factory
Check the installation, use rubber spacers if
necessary
Remedy
Operate the machine briefly (max. 5min.)
without sealing chamber monitoring
Install the expansion tank no more than 10m
above the top edge of the suction port
Change the oil
Replace the moisture sensors
Replace the mechanical shaft seal after con-
tacting the factory
Troubleshooting
Fault: The machine does
not run smoothly and is
noisy
Fault: Mechanical shaft
seal leaks, sealing cham-
ber monitor reports fault
and switches the ma-
chine off
9-3