Fixing The Power Supply Cable To The Vibrator Terminal Board; Variable Frequency Supply; Section 4: Use Of The Vibrator; Preliminary Checks - Venanzetti Vibrazioni Milano ALDAK VV-E Uso Y Manutención

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.
Always use eyelet insulated terminal for connections.
Prevent fraying that could cause interruption or short circuits.
Remember to place the relevant washers before the nuts. This
prevents loosening with consequent uncertain connection to the
network and possible damage.
Do not overlay the individual cable wires.
Carry out the connection according to the diagrams shown and tighten
the cable-holder fully home.
We recommend to fix the cable not more than 0,5m after the cable
gland, in way that no pull-out force is applied on the cable.
Position the foam rubber block ensuring that all wires are held and as-
semble the cover paying attention not to damage the seals.
Always check that the network voltage and frequency correspond
to that indicated on the vibrator's identification plate before sup-
plying power (Fig.2 page 2).
All vibrators must be connected to an adequate external overloa-
ding 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 in-
terlocked 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, see diagrams
6B (page 3) as examples of power and control circuits in case of vibra-
tors with thermistors. All vibrators starting from and including frame size
MA are equipped with a PTC 30°C thermistor (DIN 4408-44082). The
thermistor is accessible in the terminal box and can be connected to an
adequate control equipment for protection of the vibrator.
Pay attention to the way of fastening the cable in the cable-grip; in
order to guarantee the mechanical protection IP66, please tighten
strictly the metal ring to press the cable inside.
Important!: For the choice of start-up/shutdown and overloading
protection electrical appliances refer to the technical data, electri-
cal features, nominal current and start-up current. Also always
choose delayed magnetic-circuit breakers, to prevent release du-
ring start-up time, which may be longer in low environmental tem-
peratures.

3.5 VARIABLE FREQuENCY SuPPLY

All of the vibrators can be powered with a frequency drive (inverter) from
20Hz up to the nominal frequency, with constant torque functioning (ra-
ther with linear course of the Volt-Hertz curve) using a PWM (Pulse Width
Modulation) frequency drive.
SECTION 4 – Use of the vibrator

4.0 PRELIMINARY CHECKS

ATTENTION: Controls must be carried out by specialised staff. Du-
ring disassembly and re-assembly of protective parts (wiring box
cover and weight cover), remove the power supply from the vibra-
tor.
Check current draw :
- Remove the cover from the terminal board compartment.
- Power the vibrator.
- Use an ammeter to verify, on each phase, that the input current does
not exceed the value indicated on the identification plate.
ENGLISH
The maximum current limit is strictly dependent from the tempera-
ture class T3 or T4 (carefully see point 3.0.1).
If the current draw exceeds that stated on the plate:
- Check the flexible system and the vibrating machine framework are in
compliance with the regulations for correct application.
- Reduce force (centrifugal force) by adjusting the weights. Reduce them
until the value of absorbed current corresponds to that stated on the
identification plate, for the adopted temperature class.
ATTENTION: Avoid touching or allowing anyone to touch live parts
such as the terminal board.
Remember to allow the vibrators to function for brief periods of
time during set-up. This prevents damage to the vibrator and struc-
ture in the case of anomalies.
Once the indicated controls have been carried out close the cover
definitively.
Check direction of rotation:
In applications where direction of rotation must be ascertained:
- Remove a weight cover;
- Wear protective glasses;
- Power the vibrator for a brief period of time;
ATTENTION: in this phase ensure that no-one can touch or be
struck by the rotating masses.
- If the direction of rotation must be inverted, act on terminal board con-
nections, after having removed the power supply from the vibrator, re-
versing two phases.
- Reposition the covers, ensuring that the seals (OR) are correctly posi-
tioned and tighten the screw fastener.

4.1 VIBRATION FORCE ADJuSTMENT

ATTENTION: This operation must be carried out exclusively by spe-
cialised staff with the power supply disconnected.
- To adjust vibration intensity it's necessary to remove the weight co-
vers.
- It is usually necessary to adjust the weights in the same direction in the
two ends. To allow exact adjustment of the weights, the vibrators are
equipped with a patented system that prevents the adjustable weight to
turn in the wrong direction.
- Unscrew the mobile weight screw fastener or nut. The adjustable wei-
ghts positioned at the two ends of the shaft must be positioned in a way
to read the same value on the reference percentage scale. The weights
positioned at the two sides of the vibrator can only be adjusted on two
different values for particular machines and for special uses.
- Once the eccentric weight has been taken to the desired value tighten
the screw fastener or nut using the dynamometric wrench and repeat
the same operation on the opposite weight (see the table on paragraph
3..2 for coupling torques)
- Once the operation on the two sides has been carried out, re-mount the
covers on the screws and washers paying attention that the seals are
correctly positioned in their houses.
4.2 START-uP AND SHuTDOWN OF THE VIBRATOR DuRING uSE
Start-up takes place by always and only acting on the power supply
switch by positioning it in the ON position (insertion of the power supply
network).
The vibrator works.
Stop the vibrator by always and only acting on the power supply switch
by positioning it in the OFF position (disconnection of the power supply
network).
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