Installation and operating instructions WILO Mather and Platt – VT pumps 32
9. Electrical connections
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].
• 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 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 machine 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.
9.1 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 performance at the duty point required.
Please contact WILO Mather and Platt 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 Mather and Platt at the quotation stage
if the pump set will be driven by a frequency converter, this
might influence the motor selection.
• Strictly follow the Frequency converter manufacturer
instructions
• The minimum rotation speed of the pump should never go
below 40% of the nominal speed.
10. 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.
10.1 List of Essentials to made available at site prior
to start commissioning
• Set of I-Beams of erection.
• Set of Slings, Shackles, wire ropes, eye bolts, wrenches.
• Set of spanners, Allen keys, hammer, scrapper, screw drivers.
• Skilled manpower, ladder, sufficient lighting, Helmet, Safety
jacket, Safety Shoes etc.
10.2 Cleaning prior to start
10.2.1 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.
10.2.2 Cleaning of Bearings
VT pumps can be supplied with oil or grease lubricated
bearing depending upon the suitability. If the unit has been
in store for a long period before commissioning, the bearings
should be cleaned and flushed out with clean white spirit or
good quality paraffin. Waste oil/paraffin & used cotton cloth
should not be used for this purpose, as particles of foreign
matter may be left behind which would cause damage when
the bearing is in service. Bearings should be then filled with
recommended grade and quality of fresh lubricant to the
level. Refer list of lubricants at the end of this manual.
Ball and roller bearings are given an initial charge of grease
before leaving WILO Mather & Platt works and do not require
any attention beyond the normal greasing routine before
the first servicing period. Only greases recommended by
pump manufacturer or their equivalent should be used.
Bearings should never be over grease.
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