Maintenance Intervals; Maintenance Tasks; Troubleshooting And Possible Solutions - Wilo Sub TWU 3 Série Notice De Montage Et De Mise En Service

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ble free operation of the product. After working on the
unit, all cleaning materials and tools should be removed
from it. All materials and tools should be stored in an
appropriate place.
• Lubricants, such as oil and grease, must be collected in
suitable vessels and disposed of properly (in accor-
dance with the 75/439/EEC directive and with §§5a, 5b
AbfG). Appropriate protective clothing is to be worn for
cleaning and maintenance jobs. This is to be disposed
of in accordance with waste code TA 524 02 and EC
Directive 91/689/EEC.
Also observe the local laws and regulations!
• Only lubricants expressly recommended by the manu-
facturer may be used. Oils and lubricants should not be
mixed.
• Only use genuine parts made by the manufacturer.
8.1 Lubricants
The motor is filled with non-toxic white oil, which is
potentially biodegradable. Checks to the oil and filling
level must be made by the manufacturer.

8.2 Maintenance intervals

Overview of the maintenance intervals needed:
8.2.1 Before initial start-up or after a longer period of
storage
• Check the insulation resistance
• Functional inspection of safety and control devices

8.3 Maintenance tasks

8.3.1 Checking the insulation resistance
To check the insulation resistance, the power supply
cable must be disconnected. The resistance can then
be measured with an insulation tester (measuring volt-
age = 1,000 V). The following values may not be
exceeded:
• For the initial start-up: Minimum insulation resis-
tance 20 M:.
• For further measurements: Value must be greater
than 2 M:.
If the insulation resistance is too low, moisture
may have penetrated the cable and/or the motor.
Do not connect the machine, consult manufac-
turer!
8.3.2 Functional inspection of safety and control devices
Monitoring devices include temperature sensors in the
motor, motor protection relays, overvoltage relays etc.
Motor protection and overvoltage relays and other trip
elements can generally be triggered manually for test
purposes.

9 Troubleshooting and possible solutions

In order to prevent damage or injury while rectifying
product faults, the following points must be observed
in all cases:
40
• Only attempt to rectify a fault if you have qualified
staff. This means that each job must be carried out by
trained specialist staff. For example, electrical work
must be performed by a trained electrician.
• Always secure the product against an accidental restart
by disconnecting it from the mains. Take appropriate
safety precautions.
• Always have a second person on hand to ensure that
the product has been switched off for safety.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the product are made at the
operator's own risk and release the manufacturer from
any warranty obligations.
9.0.1 Fault: The unit will not start
1 Electricity supply interrupted, short circuit or earth
fault in the cable or motor windings
• Have the motor and wires checked by a specialist
and replaced if necessary.
2 Fuses, the motor protection switch and/or monitoring
devices are triggered
• 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 spec-
ifications, and reset monitoring equipment.
• Check that the impeller runs smoothly. Clean or free
it as necessary.
9.0.2 Fault: The unit starts, but the motor protection
switch triggers shortly after start-up
1 The thermal trigger on the motor protection switch is
incorrect/set incorrectly
• Have a specialist compare the selection and setting
of the trigger with the technical specifications and
correct if necessary
2 Increased power consumption due to major voltage
drop
• Have an electrician check the voltage on each phase
and rewire if necessary
3 Two-phase operation
• Have a specialist inspect the connection and correct
it as necessary
4 Excessive voltage differences on the three phases
• Have a specialist inspect the connection and the
switching system and correct if necessary
5 Incorrect direction of rotation
• Swap the 2 phases from the mains supply
6 Impeller impeded by adhesive material, blockages and/
or solid matter, increased current consumption
• Switch off the unit, secure it against being switched
on again and free the impeller or clean the intake
port
7 The pumped liquid is too dense
• Contact the manufacturer
9.0.3 Fault: Unit runs but does not pump
1 No pumped liquid
• Open the container intake or sliders
2 Intake blocked
• Clean the intake, slider, intake port or intake strainer
3 Impeller blocked or obstructed
• Switch off the unit, secure it against being switched
on again and free the impeller
4 Defective hose or pipeline
WILO SE 10/2011 V4.1WE