Inhoudsopgave
Advertenties
Lubricate the motor shaft extension with a graphite-
base, dripfree, anti-friction product.
Do not use oil as it can harm the mechanical seal
below (see section 8.4.).
With the pump in the vertical position, insert the motor
shaft in the coupling, aligning the key with the key slot
and resting the motor flange on the lantern flange.
Turn the motor, adjusting the position of the terminal
box as required and aligning the holes on the flanges.
ATTENTION: the 4 flange screws (70.18) with
nut must be uniformly tightened with alternated
crossover tightening procedure in diametrically
opposite positions (see section 9.1.).
Before and after tightening the screws (70.18), make
sure the coupling with pump shaft and motor shaft can
be freely turned by hand (remove and then replace the
guard 32.30).
ATTENTION: for removing or replacing the motor
see section 8.3.
6.6. Pipes
Provide a diameter assuring a liquid flow velocity not
higher than 1.5 m/s for suction, and 3 m/s for delivery.
The pipe diameters must never be smaller than the
pump connection ports.
The arrows on the pump casing (14.00) indicate the
inlet (suction) and outlet (delivery) ports.
Ensure the internal pipe surface is clean before
connection.
Secure all pipes to their rests close to the pump and
connect them so that they are not subjected to stress
and do not transmit vibration or flexion strain to the
pump (see fig.3).
Fig. 3 Systems diagram
A = Suction lift operation
B = Positive suction head operation
4
5
B
5
1
A
2
1
MXV, MXV-B Rev100000244_01 - Operating Instructions
5
3.93.113
7
7
1. Strainer
2. Foot valve
3. Check valve
4. Bypass valve
5. Gate valve
6. Pressure gauge
7. Supports and clamps for
pipelines
Provide for the possibility of draining the pump
without having to drain the entire system.
Install correctly any compensators for absorption of
expansion or impeding noise transmission.
With flanged ports make sure the gaskets do not
protrude inside the pipes.
6.6.1. Suction pipe
When a pump is located above the water level
(suction lift operation, fig. 3 A), fit a foot valve with a
strainer, which must always remain immersed.
The suction pipe must be perfectly airtight and be led
upwards in order to avoid air pockets.
When the liquid level on the suction side is above
the pump (inflow under positive suction head, fig. 3
B), fit a gate valve.
Follow local specifications if increasing network
pressure.
Install a strainer on the suction side of the pump to
prevent foreign particles from entering the pump.
6.6.2. Delivery pipe
Install a gate valve in the delivery pipe to regulate flow-
rate, head and absorbed power.
Install a pressure gauge between the pump and the
gate valve.
ATTENTION: install a check valve between the pump
and the gate valve in order to avoid reverse flow after
switching off the pump unit and to protect the pump
from water hammering.
With a variable frequency drive, the check valve (3)
must be installed before the pressure transducer.
With servo-operated shut-off devices, provide an air
5
vessel or other protection device against surge of
pressure in the case of sudden changes of flow rate.
3
6.7. Electrical connection
OFF
6
Electrical connection must be carried out only
by a qualified electrician in accordance with
local regulations.
Follow all safety standards.
The unit must be properly earthed (grounded).
Connect the earthing (grounding) conductor to the
terminal with the
Compare the frequency and mains voltage with the
name-plate data and connect the supply conductors
to the terminals in accordance with the appropriate
diagram inside the terminal box cover.
ATTENTION: never allow washers or other
metal parts to fall into the internal cable
opening between the terminal box and
stator. If this occurs, dismantle the motor to
recover the object which has fallen inside.
ATTENTION: with motor power rating ≥ 5.5 kW
avoid direct starting. Provide a control panel
with star-delta starting or an
device.
If the terminal box is provided with an inlet gland, use
a flexible power supply cord of the H07 RN-Ftype with
section of cable not less than (par. 16 TAB 1).
marking.
other starting
Page 17 / 136
EN
Advertenties
Hoofdstukken
Inhoudsopgave
