Electrical Connection; Operation With Frequency Converter; Commissioning; Cleaning Prior To Start - Wilo -SCP Einbau- Und Betriebsanleitung

7.2.10 Electrical connection

WARNING! Danger of electric shock
The electrical connection should be established
by an electrician approved by the local electri-
city supply company in compliance with the
applicable local regulations [e.g. VDE regula-
tions].
• The current type and voltage of the mains
connection must correspond to the specifications
on the name plate.
• Refer to the motor and panels instruction manual
at the time of installation and connection. Motors
or electrical control panels are operated with
alternating or industrial high-voltage current.
• The electrical connection is established via a fixed
mains connection line.
• The local regulations must be adhered to.
• Ensure that there is a provision for isolation of all
energy sources and locking. If the machine has
been switched off by, a protective device, it must
not be switched on again until the error has been
corrected.
• The electrical system (machine including protec-
tive devices and operating position) must always
be grounded. Refer pump GA drawing & respective
manuals of motor/electrical control panel for
connecting earthing suitable as per motor rating
and relevant regulations and standards including
proper earthing lug size and fasteners.
• Under no circumstances may any connecting cab-
les touch the pipeline or the pump or motor
housing.
• If there is a possibility that people can come into
contact with the machine and the pumped liquid
(e.g. at construction sites), the grounded connec-
tion must be additionally equipped with a fault
current protection device.
• To ensure drip water protection and strain relief of
the cable connections, use cables with an approp-
riate outer diameter and screw the cable glands
tight. Furthermore any cables nearby screwed
connections for outlet loops should be bent in
order to divert any accumulating drip water. Close
any unassigned cable glands with the existing
sealing discs and screw them tight.
Installation and operating instructions Wilo-SCP

7.2.11 Operation with frequency converter

The rotation speed can be adjusted in the opera-
ting limits of the pump given in the technical data.
The electrical motors can be driven by a frequency
converter in order to adapt the pump performan-
ces the duty point required. Please contact Wilo
before connecting the frequency converter to the
motor to make sure that the electrical motor is
compatible with this driver. In any case, please
inform Wilo at the quotation stage if the pump set
will by driven by a frequency converter this might
influence the motor selection.
• The converter should never generate voltages
peaks to the motor connection higher than 850V
and deliver voltages variations ΔU/Δt greater than
2500 V/μs.
• If the above conditions cannot be fulfilled, an
appropriate filter should be place between the
frequency converter and the motor. Please cont-
act the frequency converter manufacturer for gui-
dance in the selection of this filter.
• Strictly follow the Frequency converter manufac-
turer instructions.
• The minimum rotation speed of the pump should
never go bellow 40% of the nominal speed.

8 Commissioning

WARNING! Danger of injury
The devices whether on pump/motor/electrical
panels must never be dismantled or disabled.
They must be checked by an authorized techni-
cian for proper functioning before, start-up.
Refer to motor & electrical panel instruction
manuals for electrical safety & control devices
information.
WARNING! Danger of pump damage!
Do not operate the pump away from specified
operating range. Operating beyond duty point
may not pose a risk to the operator but will
reduce the efficiency of the pump or damage the
pump itself. Operation more than 5 minutes, at
close valve condition is not recommended. For
hot liquids this is not recommended at all.
Ensure that always site NPSH-A is more than
NPSH-R.

8.1 Cleaning prior to start

8.1.1 Pipe work flushing
Before the pumps are brought into service, either
on initial commissioning or on re-commissioning
after overhaul, the pipe work associated with the
pumps must be flushed through. This will clear
deposits or scales which may have accumulated in
the pipes, and which could damage the internal
components of the pumps.
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