Before Switching On; Temporary Shutdown - Wilo Sub TWU 4 Serie Instrucciones De Instalación Y Funcionamiento

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Before switching on for the first time, the installation
must be checked as described in the "Installation"
chapter and an isolation check must be carried out
according to the "Maintenance" chapter.
When using switching devices and/or plugs, the corre-
sponding IP protection classes must be observed.

6.5.1 Before switching on

The following points must be checked before switch-
ing on the submersible motor pump:
• Cable guidance – no loops, slightly taut.
• Check the temperature of the pumped liquid and the
submersion depth – see technical data.
• The product machine is fixed securely – vibration-free
operation must be assured.
• The accessories – pedestal, cooling jacket etc. are
securely fixed.
• The suction chamber of the pump sump and the pipe-
lines must be completely free of dirt.
• Flush out the pipeline and the product before connect-
ing them to the supply network.
• Carry out an insulation check. For details on this, see
the "Maintenance" chapter.
• The hydraulic housing must be flooded, i.e. it should be
completely full of fluid, with no air in it at all. Bleeding
can be carried out using a suitable bleeding device in
the system, or, if available, with bleeder screws on the
discharge port.
• The sliders on the pressure side should be half opened
during commissioning so that the pipeline can be bled.
• You can use an electrically actuated check valve to
reduce or prevent water impact. The unit can be
switched on in a throttled or closed slider position.
However, do not operate for long periods (> 5
minutes) with the slider closed or nearly closed,
and do not run the machine dry.
• Check all level control and dry-run protection systems.
6.5.2 After starting up
The rated current is briefly exceeded during the start-
up procedure. Once the start-up procedure has com-
pleted, the operating current may no longer exceed the
rated current.
If the motor does not start immediately after the unit
is switched on, it must be switched off without delay.
The start pauses specified in the "Technical data"
chapter must be adhered to before starting up again. If
the fault recurs, the unit must be switched off again
immediately. The unit may only be restarted, once the
fault has been rectified.
6.6 Safety rules during operation
When operating the product, always follow the locally
applicable laws and regulations for work safety, acci-
dent prevention and handling electrical machinery. To
help to ensure safe working practice, the responsibili-
ties of employees should be clearly set out by the
owner. All personnel are responsible for ensuring that
regulations are observed.
The product has moving parts. During operation, these
parts turn to pump the fluid. Certain materials in the
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pumped fluid can cause very sharp edges to form on
the moving parts.
Beware of rotating parts!
The rotating parts can crush and sever limbs.
Never reach into the hydraulics or the moving
parts during operation. Switch off the product
and let the moving parts come to a stop before
maintenance or repair work!
The following must be checked at regular intervals:
• Operating voltage (permissible deviation +/- 5% of
the rated voltage)
• Frequency (permissible deviation +/-2% of the rated
frequency)
• Current consumption (permissible deviation
between phases is a maximum of 5%)
• Voltage difference between the individual phases
(max. 1%)
• Starts and stops per hour (see technical data)
• Air entry in the intake, a guide plate or deflector
plate should be fitted if necessary
• Minimum water immersion level, level control unit,
dry-run protection
• Smooth, low vibration running
• Shut-off valves in the intake and discharge pipes
must be open.
7 Shut-down/disposal
All work must be carried out with the greatest care.
Proper protective clothing must be worn.
When carrying out work in basins and/or containers,
the respective local protection measures must be
observed in all cases. A second person must be present
for safety reasons.
Only hoisting gear that is in a technically perfect condi-
tion and load-carrying equipment that has been offi-
cially approved may be used for lowering and raising
the product.
Risk of fatal injury due to malfunctions!
Load-carrying equipment and hoisting gear must
be in a perfect technical condition. Work may
only commence if the hoisting gear has been
checked and found to be in perfect working
order. If it is not inspected, danger to personnel
may result!

7.1 Temporary shutdown

For this type of shutdown, the product remains
installed and is not cut off from the electricity supply.
For temporary shutdown, the product must remain
completely submerged so that it is protected from frost
and ice. Ensure that the temperature of the pumped
liquid and in the operating area does not fall below
+3 °C.
This ensures that the product will be ready for opera-
tion at all times. During longer shutdown periods, carry
WILO SE 10/2011 V4.1WE