Electrical Work; Safety And Monitoring Devices; Conduct During Operation; Fluids - Wilo Rexa PRO Notice De Montage Et De Mise En Service

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2.3. Electrical work

DANGER: electrical hazard!
Incorrectly performed electrical work can result
in fatal injury! This work may only be carried out
by a qualified electrician.
CAUTION: beware of moisture!
Moisture penetrating the cable will damage
both the pump and the cable. Never immerse
the cable end in fluid and always protect it from
moisture. Unused wires must be insulated!
Our pumps are operated with single or three phase
alternating current. The governing national direc-
tives, standards, and regulations (e.g. VDE 0100) as
well as the requirements of the local energy supply
company must be observed.
The person operating the pump must know where
it is supplied with power and how to cut off the
supply. A motor protection switch must be installed
by the customer for three phase AC motors. It is
advisable to install a residual-current device (RCD).
If there is a possibility that people can come into
contact with the pump and the fluid (for example
on construction sites), the connection must be
equipped with an additional residual current device
(RCD).
The section entitled "Electrical connection" must be
observed when connecting the product. The techni-
cal specifications must be observed strictly. Our
pumps must always be grounded.
If the pump has been switched off by a protective
device, it must not be switched on again until the
fault has been eliminated.
When the pump is connected to the electrical con-
trol panel, particularly when electronic devices such
as soft start control or variable frequency drives are
used, the switchgear manufacturer's specifications
must be followed to comply with the electromag-
netic compatibility (EMC) requirements. Special
separate shielding measures (e.g. shielded cables,
filters, etc.) may be necessary for the power supply
and control cables.
The connection may only be made if the switch-
gear complies with the harmonized EU standards.
Cellphones and other mobile radio equipment may
cause malfunctions in the system.
WARNING: electromagnetic radiation!
Electromagnetic radiation can pose a fatal risk
for people with cardiac stimulators. Affix corre-
sponding signs to the unit and inform affected
persons accordingly!
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2.4. Safety and monitoring devices

The pumps are equipped with a thermal winding
monitor and motor leakage detection. If the motor
becomes too hot during operation or if fluid leaks
into the motor, the pump is switched off.
These devices must be connected by an electrician
and checked to ensure that they function correctly
before commissioning.
Personnel must be informed about the installed
devices and how they work.
CAUTION!
Never operate the pump if the monitoring de-
vices have been removed or damaged, or if they
do not work.

2.5. Conduct during operation

When operating the pump, always follow the
locally applicable laws and regulations for work
safety, accident prevention, and handling electrical
machinery. To help ensure safe working practice,
the responsibilities of employees should be clearly
specified by the operator. All personnel are respon-
sible for ensuring that regulations are observed.
Due to their design, centrifugal pumps have rotating
parts that are easily accessible. Depending on the
operating conditions, sharp edges can develop on
these parts.
WARNING: danger of crushing and amputation
of limbs!
Sharp edges can form on the rotating parts in
the hydraulics. These can result in crushing and
amputation of limbs.
• Never reach into the hydraulics when the ma-
chine is in operation.
• Before performing maintenance or repairs,
switch off the pump, disconnect it from the
power supply, and secure it against being
switched on again without authorization.
• Always allow the rotating parts to come to a
standstill!

2.6. Fluids

Each fluid differs in respect of composition, cor-
rosiveness, abrasiveness, dry matter content, and
in many other aspects. Generally, our pumps can
be used for many applications. Please note that if
requirements change (density, viscosity, or general
composition), this can also affect many parameters
of the pump.
If the pump is used in or switched over to a different
fluid, observe the following points:
• The fluid can be contaminated by oil from the seal-
ing chamber if the mechanical seal is defective.
Use with potable water is not permitted!
SAFETY
WILO SE 2014-11 V05 Letter