Wilo Rexa CUT, Installation And Operating Instructions Manual, Page: 38 / 384

38 WILO SE 11-2014 V05 DIN A4
English SAFETY
2.3. Electrical work
ELECTRICAL hazard!
Incorrectly performed electrical work can
result in fatal injury! This work may only be
carried out by a qualified electrician.
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 insu-
lated!
Our pumps are operated with alternating or
three-phase current. The governing national
directives, 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
technical specifications must be observed strictly.
Our pumps must always be grounded.
If the pump has been switched off by a protec-
tive device, it must not be switched on again
until the error has been corrected.
When the pump is connected to the electrical
control panel, particularly when electronic devices
such as soft start-up control or frequency con-
verters are used, the switchgear manufacturer’s
specifications must be followed to comply with
the electromagnetic compatibility (EMC) require -
ments. Special separate shielding measures (e.g.
shielded cables, filters, etc.) may be necessary for
the power supply and control cables.
Connections may only be made providing the
switchgear meets the harmonised EU standards.
Mobile radio equipment may cause malfunc-
tions in the system.
BEWARE of electromagnetic radiation!
Electromagnetic radiation can pose a fatal
risk for people with cardiac stimulators. Put
up appropriate signs and make sure anyone
affected is aware of the danger!
2.4. Safety and monitoring devices
The pumps are equipped with the following mon -
itoring devices:
• Thermal winding monitoring
• Motor compartment (motor version "P" only)
The pump is switched off if the motor gets too
hot during operation or if liquid gets into the
motor.
These devices must be connected by an electri -
cian and checked to ensure that they function
correctly before commissioning.
Personnel must be informed about the installed
systems and how they work.
CAUTION!
Never operate the pump if the monitoring
devices 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 elec -
trical machinery. To help ensure safe working
practice, the responsibilities of employees should
be clearly specified by the operator. All personnel
are responsible for ensuring that regulations are
observed.
Due to their design, centrifugal pumps have
rotating parts that are easily accessible. Depend-
ing on the operating condition, sharp edges can
develop on these parts.
BEWARE of the macerator!
The pump is equipped with a macerator. When
coming into contact with the blade, limbs
may be crushed or be amputated! Never reach
directly into the macerator.
• Before performing maintenance or repairs,
switch off the pump, disconnect it from the
mains and secure it against being switched on
again without authorization.
• Always allow the macerator to come to a
standstill!
• Wear protective gloves during maintenance
and repair work!
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 parame -
ters of the pump.
When using or replacing the pump in a different
fluid, observe the following points:
• The fluid can be contaminated by oil from the
sealing chamber if the mechanical shaft seal is
defective.
Use with drinking water is not permitted!
• Pumps that have been operated in dirty waste
water must be cleaned thoroughly before being
used for other fluids.
• Pumps that have been operated in sewage water
containing faeces and/or fluids that are hazardous
to health must be decontaminated before being
used with other fluids.