Installation and operating instructions WILO Mather and Platt
–
MISO / PISO Pumps
18
7.2.7 Stuffing box packing (figure 11 Pg. No. 6)
CAUTION! Risk of quick wear or leakages packing
should be handled with care and it should not be allowed
to pick up the dust or abrasive matter by coming into
contact with floors or dirty benches. It is bad practice to
hammer packing to facilitate the insertion.
Pumps are dispatched from our works with the stuffing
boxes unpacked; otherwise packing will be aged. The
packing is packed with greaseproof paper and dispatched
with the pump. The softest possible packing i.e. plaited
cotton impregnated with oil and colloidal graphite is
recommended for most duties. Required number of and
lengths of packing should be cut off so that each length will
pass once round the shaft sleeve line and meet to end. The
ends of packing must be cut at 45 °. After cleaning the
stuffing box and shaft sleeves the packing should be
inserted into the stuffing box. Each ring should be pushed
into position individually using the glands joint of each ring
must be positioned 180˚
from joints of its neighbor. A
logging ring included in the arrangement; should be inserted
into the stuffing box at the appropriate time during the
packing sequence so that it is aligned with the cooling water
connection. The gland should now be fitted square with the
pump casing and the nut should be screwed up to little more
than finger tightness.
7.2.8 Mechanical seal
CAUTION! Damage to the pump
Never start the pump without liquid inside otherwise the
mechanical seal will be damaged instantaneously.
No real operation is required during the setup of the pump.
Only filling and venting the pump are mandatory before
switching on the main.
7.2.9 Pressure gauge connections
CAUTION! Risk of leakage of the fluid!
Never connect a pressure gauge onto the pump when the
system is under pressure.
Pressure gauge connections are available on the pump
casing close to the flanges. Then pressure gauge can be
connected on suction and discharge side.
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 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.
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 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 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.
