Fault: The Unit Will Not Start; Fault: The Unit Does Not Run Smoothly And Is Noisy; Further Steps For Troubleshooting - Wilo Drain TP 80 Notice De Montage Et De Mise En Service

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9.0.1 Fault: The unit will not start

1 Electricity supply interrupted, short-circuit or earth
fault in the cable and/or motor winding
• Have the motor and wires checked by a specialist
and replaced if necessary
2 Tripping of fuses, motor protection switch and/or
monitoring devices
• Have a specialist inspect the connections and cor-
rect them as necessary
• Have the motor protection switches and fuses
installed or adjusted according to the technical speci-
fications, and reset monitoring equipment
• Check that the impeller/propeller run freely and if
necessary clean them and ensure that they run
freely again
3 Sealing chamber monitoring (optional) has interrupted
the electric circuit (operator-related)
• See fault: Mechanical seal leakage, sealing chamber
monitoring reports a fault or shuts down the unit
9.0.2 Fault: The unit starts, but the motor protection
switch triggers shortly after commissioning
1 The thermal trigger on the motor protection switch is
incorrectly set
• Have a specialist compare the setting of the trigger
with the technical specifications and correct it as
necessary
2 Increased power consumption due to major voltage
drop
• Have an electrician check the voltage on each phase
and rewire if necessary
3 2-phase operation
• Have a specialist inspect the connection and correct
it as necessary
4 Excessive voltage differences on the 3 phases
• Have a specialist inspect the connection and the
switching system and correct as necessary
5 Incorrect direction of rotation
• Swap the 2 phases of the mains supply
6 Impeller/propeller slowed by accumulation, clogging
and/or solid matter, increased current consumption
• Switch off the unit, secure it against being switched
back on again and free the impeller/propeller or clear
the suction port
7 The fluid is too dense
• Contact the manufacturer
9.0.3 Fault: Unit is running but not pumping
1 No fluid available
• Open inlet for tank or slide valve
2 Inlet blocked
• Clean the supply line, slide valve, suction piece, suc-
tion port or suction strainer
3 Impeller/propeller blocked or slowed
• Switch off the unit, secure it against being switched
back on again and free the impeller/propeller
4 Faulty hose/piping
• Replace defective parts
5 Intermittent operation
• Check switching system
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9.0.4 Fault: The unit runs, but not within the specified op-
erating values
1 Inlet blocked
• Clean the supply line, slide valve, suction piece, suc-
tion port or suction strainer
2 Slide valve in the pressure pipe closed
• Fully open the slide valve
3 Impeller/propeller blocked or slowed
• Switch off the unit, secure it against being switched
back on again and free the impeller/propeller
4 Incorrect direction of rotation
• Replace 2 phases on the mains supply
5 Air in the system
• Check the piping, pressure shroud and/or hydraulics,
and vent if necessary
6 Unit pumping against excessive pressure
• Check the slide valve in the pressure pipe and open it
completely if necessary, use a different impeller,
consult the plant
7 Signs of wear
• Replace worn parts
8 Faulty hose/piping
• Replace defective parts
9 Inadmissible levels of gas in the fluid
• Consult the plant
10 2-phase operation
• Have a specialist inspect the connection and correct
it as necessary
11 Excessive decrease in the water table during operation
• Check the supply and capacity of the system, and
inspect the level control settings and functionality

9.0.5 Fault: The unit does not run smoothly and is noisy

1 Unit is operating in an inadmissible range
• Check the operational data of the unit and correct if
necessary and/or adjust the operating conditions
2 Suction port, suction strainer and/or impeller/propeller
clogged
• Clear suction port, suction strainer and/or impeller/
propeller
3 Impeller stiff
• Switch off the unit, secure it against being switched
back on again, free the impeller
4 Inadmissible levels of gas in the fluid
• Consult the plant
5 2-phase operation
• Have a specialist inspect the connection and correct
it as necessary
6 Incorrect direction of rotation
• Replace 2 phases on the mains supply
7 Signs of wear
• Replace worn parts
8 Defective motor bearing
• Consult the plant
9 Unit is installed under tension
• Check installation, use expansion joints if necessary

9.0.6 Further steps for troubleshooting

If the points listed here do not rectify the fault, con-
tact customer service. They can help you as follows:
• Telephone or written support from customer service
• On-site support from customer service
• Inspection or repair of the unit at the factory
WILO SE 2017/06