Electrical Work; Safety And Monitoring Devices; Safety Rules During Operation; Fluids - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

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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!
The pumps are operated with single-phase cur-
rent. 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. 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-operated protection switch
(RCD).
The section entitled "Electrical connection"
must be observed when connecting the product.
The technical specifications must be observed
strictly. The 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) re-
quirements. Special separate shielding measures
(e.g. shielded cables, filters, etc.) may be neces-
sary for the power supply and control cables.
Connections may only be made providing the
switchgears meet 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:
• Undervoltage
• Overvoltage
• Short-circuit
32
• Temperature (frequency converter)
• Dry run
• Leakage
These functions are implemented by the frequen-
cy converter and do not have to be connected
separately.
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. Safety rules 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.
The pump is equipped with moving parts. During
operation, these parts rotate in order to pump the
fluid. Certain substances in the fluid can result in
very sharp edges forming on the moving parts.
WARNING: rotating parts!
The rotating parts can crush and sever limbs.
Never reach into the hydraulics or touch
the rotating parts when the machine is in
operation. Before performing maintenance or
repairs, switch off the pump and wait for 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 parame-
ters of the pump.
When using or replacing the pump in a different
fluid, observe the following points:
• The motor is filled with oil. The fluid can be con-
taminated by this oil if the mechanical shaft seal
is defective.
• When used in potable water applications, all the
parts in contact with fluid must be fit for the pur-
pose. This must be checked in accordance with
the local regulations and laws.
The pumps must not be used in drainage and
sewage and/or with fluids that are hazardous to
health.

2.7. Sound-pressure

The submersible pump generates a sound-pres-
sure level of approx. 70 dB(A) during operation.
However, the actual sound-pressure level
depends on several factors. These include, for
example, the installation depth, installation,
WILO SE 05/2014 Ed.04 DIN A4
SAFETY