ITALVIBRAS GIORGIO SILINGARDI MVSI Serie Guia Tecnica página 19

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Remember that most damage and faults are due to irregular
fixing or badly performed tightening.
Re-control tightening after a brief functioning period.
It is advised to fix the installed vibrator to a steel safety cable, with
opportune diameter and a length that will support the vibrator in the
case of its accidental detachment. Max. fall of 15 cm (6") (Fig. 11,
page 8).
Attention: Do not carry out welding to the structure with the
vibrator mounted and connected. Welding could cause damage
to windings and bearings.
3.2 ELECTRICAL CONNECTION (Fig.12, page 8)
The wires making up the power supply cable used to connect the
vibrator to the network must have an adequate section so that the
current density, in each wire does not exceed 4 A/mm
is used exclusively for the connection of the vibrator to earth.
The section of the wires must also be adequate for the length of the
cable used so that a drop voltage along the cable is not caused that
exceeds the values prescribed by the regulation on this subject.
It is also recommended to use flexible cables that have an external
diameter that corresponds to that stated in the «Technical features»
table. This guarantees the perfect hold of the cable gland on the
power supply cable.
3.3 TERMINAL BOARD WIRING DIAGRAMS
ATTENTION: A tropicalised screw, indicated with the earth
symbol, is situated in the terminal box (Fig. 13, page 8). The
yellow-green (only green for USA) wire of the power supply
cable must be connected to this screw that acts as the earth
connection of the vibrator.
The sheet of wiring diagrams is found inside the terminal board com-
partment. Use the diagram that has the reference that corresponds
to that indicated on the identification plate.
ATTENTION: For ITV-VR vibrators electric connection and adju-
stment of the weights are linked to the pre-selected frequency
variation range (page 86).
DIAGRAM 2A (Fig. 14, page 8)
A) Lower voltage
B) Higher voltage
C) Power supply network
DIAGRAM 2C (Fig. 15, page 9)
A) Lower voltage
B) Higher voltage
C) Power supply network
DIAGRAM 2D (Fig. 16, page 9)
C) Power supply network
DIAGRAM 5A (Fig. 17, page 9)
A) ) Lower voltage
B) Higher voltage
C) Power supply network
E) Control equipment
DIAGRAM 5B (Fig. 18, page 9)
A) ) Lower voltage
B) Higher voltage
C) Power supply network
E) Control equipment
. One of these
2
∆ Delta
Y star
YY double star
Y star
∆ Delta
Y star
D) Thermistor
YY double star
Y star
D) Thermistor
DIAGRAM 1A (Fig. 19, page 9)
C) Power supply network
F ) To invert the direction of rotation
For the SINGLE-PHASE connection.
DIAGRAM 1B (Fig. 20, page 9)
C) Power supply network
F ) To invert the direction of rotation
For the SINGLE-PHASE connection.
DIAGRAM 1E (Fig. 21, page 9)
C) Power supply network
F ) To invert the direction of rotation
For the SINGLE-PHASE connection.
NOTE: The single-phase vibrators are supplied without ca-
pacitor, which the user must insert in an area protected from
vibrations. The capacitor value to be used is indicated on the
identification plate (CAP.μF), for example 10 means that a 10μF
condenser must be used, while the indication of 32/12 means
that for start-up 32μF are necessary and for normal running
12μF are necessary.
3.4 FIXING OF THE POWER SUPPLY CABLE
TO THE VIBRATOR TERMINAL BOARD
Follow the sequence of operations as indicated below.
Insert the power supply cable through the cable-gland inside the
terminal box (A Fig. 22, page 9).
Always use eyelet terminal for connections (B Fig. 22, page
9).
Prevent fraying that could cause interruption or short circuits
(A Fig. 23, page 9).
Remember to place the relevant washers before the nuts (B Fig.
23, pag.9). This prevents loosening with consequent uncertain
connection to the network and possible damage.
Do not overlay the individual cable wires (Fig.24, page 9).
Carry out the connection according to the diagrams shown and tighten
the cable-holder fully home (A Fig. 25, page 9).
Position the foam rubber block ensuring that all wires are held and
assemble the cover paying attention not to damage the seals (B
Fig. 25, page 9).
3.5 FIXING OF THE POWER SUPPLY CABLE
TO THE NETWORK
Fixing of the power supply cable to the network must be carried
out by a qualified installer according to the safety regulations
in force.
Connection of the vibrator to earth, through the yellow-green wire
(green for the USA) of the power supply cable, is obligatory.
Always check that the network voltage and frequency correspond
to that indicated on the vibrator's identification plate before
supplying power (Fig. 26, page 9).
All vibrators must be connected to an adequate external over-
loading protection, according to the regulations in force.
When vibrators are installed in pairs it is important that each one has
its own external overloading protection and that these protections are
interlocked together. This is because if a vibrator accidentally shuts
down, the power supply is interrupted to both vibrators at the same
time, so as not to damage the equipment to which they are applied
(Fig. 27, page 10). See diagrams A and B (page 106) as examples
of power and control circuits in the case of vibrators with thermistor
(supplied starting from and including the frame 70).
All vibrators starting from and including gr.70 are equipped with a PTC
130°C thermistor (DIN 44081-44082). This thermistor is accessible
in the terminal box and can be connected to an adequate control
equipment for protection of the vibrator.
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