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If the terminal box is provided with an inlet bushing,
connect the power supply cord through a conduit.
For use in swimming pools (not when persons are in
the pool), garden ponds and similar places, a residual
current device with IΔN not exceeding 30 mA must be
installed in the supply circuit.
EN
Install a device for disconnection from the mains
(switch) with a contact separation of at least 3 mm in
all poles.
With a three-phase motor install an overload protection
device with curve D appropriate for the rated current
of the pump.
Single-phase MXV-BM, are supplied with a capacitor
connected to the terminals and (for 220-240 V - 50 Hz)
with an incorporated thermal protector.
Electrical diagram (only for Calpeda motors)
W2 U2
V2
W2 U2
U1 V1 W1
U1 V1 W1
L3 L2 L1
L3 L2 L1
MXV-B 25,32,40
MXV(L), MXV(L)4 25,32,40,50 MXV(L), MXV(L)4 65-80
Refer to any other instructions (if supplied) for use
of the motor.
ATTENTION: When the pump is fed by a
frequency converter, the minimum frequency
should not fall below 25Hz and in any case the
total head of the pump should never be lower
than 3 m.
6.8. Operation with frequency converter
Adjust the frequency converter so that the limiting
values of min. 25 Hz and max. nominal frequency (50
or 60 Hz).
It is necessary to install a dv/dt filter at the output of
converter if the power cable is longer than 2 meters.
It is necessary to install a dv/dt filter or an insulated
bearing if both of the following conditions are met:
- frequency converter has a PWM frequency higher
than 8 kHz;
- nominal power >7,5 kW if 2-pole motor or nominal
power >4 kW if 4-pole motor.
Furthermore, it is necessary to install a dv/dt filter or an
insulated bearing in all the cases where the drive has a
working frequency f
where T is defined in 24 hours and f
motor frequency (i.e. higher than 8 hours per day).
In any condition the dv/dt limit curve prescribed in
the technical appendix of Calpeda catalogue must
not be exceeded furthermore, the minimum working
frequency must guarantee fluid pumping and comply
the manufacturer's prescriptions.
Voltage peaks or increased acoustic noise can be
abated by installing a dv/dt filter between the frequency
converter and the motor.
Page 18 / 136
V2
W2 U2
V2
U1 V1 W1
L1 L2 L3
MXV-B 50
<4/5f
for a time higher than 1/3T
l
n
is the nominal
n
7. STARTUP AND OPERATION
7.1. Preliminary checks before start-up of the
pump
Do not start-up the device in case of damaged parts.
Make sure the coupling with the pump shaft turns
freely when rotated by hand (see section 6.5.).
Make sure the screws (64.25) of the coupling are
tightened (see section 9.2.).
Make sure the coupling guard (32.30) is
fastened on the lantern bracket.
For MXV-B Make sure the shaft turns freely when
rotated by hand.
For this purpose use the screwdriver notch on the shaft
end ventilation side.
7.2. First starting
OFF
ATTENTION: never run the pump dry, not even for a
short trial run.
W2 U2
V2
Start the pump after filling it completely with liquid.
U1 V1 W1
When the pump is located above the water level
(suction lift operation, fig. 3A) or with a positive suction
L1 L2 L3
head which is too low (less than 1 m) to open the non-
return valve, fill the suction pipe and the pump through
the priming hole (1) (fig. 4a,4d).
To facilitate this operation use a flexible tube (or elbow)
and a funnel.
MXV-B, MXV(L) 25-32-40-50, MXV(L)4 25-32-40-50
During filling, the needle screw (14.17) in the drainage
plug (14.12) must be kept loose so as to allow a free
passage between the pressure chamber and the
suction chamber (Fig.4a).
In case of horizontal installation (only for MXV 25-32-
40-50), arrange the screw (14.17) upwards. The screw
is both used for filling and as air vent.
MXV-B, MXV 25-32-40-50
(2)
(3)
Filling and
air vent 14.04
Fig. 4a Filling:
internal passage open
MXV(L) 50-65-80, MXV(L)4 50-65-80
In the case of vertical installation, remove the plug (2)
during the filling operation to vent the suction side.
After the liquid has been released, replace the plug
(2). Proceed with filling until the liquid spills out of the
venting hole (1 ) in the upper cover. Top up until the
pump is completely vented before replacing the plugs
(1). In the case of horizontal installation, fill and vent
through the holes (1) in the pump casing (14.00).
MXV, MXV-B Rev100000244_01 - Operating Instructions
(1)
Fig. 4c Drainage
(1)
4.93.306
Fig. 4b Operating:
internal passage closed
4.93.008
14.12
14.17
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