Commissioning - Wilo -SCP Installation And Operating Instructions Manual

7.2.10 Electrical connection
WARNING! Danger of electric shock
The electrical connection should be established by an electrician
approved by the local electricity supply company in compliance
with the applicable local regulations [e.g. VDE regulations]
• 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 pumpset has been switched off by,
a protective device, it must not be switched on again until the
error has been corrected.
• The electrical system (pumpset including protective 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 cables touch the
pipeline or the pump or motor housing.
• If there is a possibility that people can come into contact with
the pumpset and the pumped liquid (e.g. at construction
sites), the grounded connection 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 appropriate 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-Split Case Pumps
7.2.11 Operation with frequency converter
The rotation speed can be adjusted in the operating
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 performances, 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 contact the frequency converter
manufacturer for guidance in the selection of this filter.
• Strictly follow the Frequency converter manufacturer
instructions.
• The minimum rotation speed of the pump should never go
below 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 technician 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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