Installation and operating instructions WILO Mather and Platt – Sump Pumps 22
8. 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
pump set has been switched off by, a protective device, it must
not be switched on again until the error has been corrected.
• The electrical system (pump set 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 pump set 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.
8.1 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.
9. 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 only 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.
9.1 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.
9.2 Pre-starting checks
Prior to starting the pump, it is essential that the following
checks be made.
• Motor properly secured to the motor stool
• All fasteners are tightened correctly
• Check that coupling guard in place
• Check bearing lubrication
• Ensure free rotation of shaft by hand when coupled
• Sufficient submergence level is maintained.
• No blockage in the strainer at the suction end.
• Check that delivery pressure gauge is connected.
• Discharge line is having non return valve & get valve installed.
• Test and make available all protection devices like alarm,
signals, interlock systems incorporated in the auxiliary and main
pumping control system.
• Ensure that all electrical checks on motor, relay setting in panel
etc. have been carried out in accordance with the instructions
of motor manufacturer.
• Ensure that cooling water arrangement is provided bearing
cooling and stuffing box.
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