Section 4: Use Of The Motor-Driven Vibrator; Inspections Before Using The Motor-Driven Vibrator; Vibration Force Adjustment; Starting And Stopping The Motor-Driven Vibrator During Use - ITALVIBRAS GIORGIO SILINGARDI MVSS Guide Technique

against overloads. Also opt for delayed magnetothermic
switches to prevent release during the starting phase which
may be longer at low ambient temperatures.
SECTION 4
Use of the motor-driven vibrator
4.0 INSPECTIONS BEFORE USING THE MOTOR-
DRIVEN VIBRATOR
ATTENTION: These inspections must be carried out by
specialized personnel.
Always disconnect the electric rotary vibrator from the
electricity supply when removing and remounting guards
(terminal box cover and weight cover).
Current draw.
- Remove the cover from the terminal box.
- Power the electric rotary vibrator.
- Use an amperometric clamp on all phases (Fig. 26) to check that
the current draw does not exceed the data plate values:
If this is not the case:
- Check that the flexible system and structural elements comply
with the current use requirements.
- Reduce the vibration force by adjusting the weights until the
absorbed current value returns within data plate values.
Remember to operate the electric rotary vibrator for brief
periods during set-up in order to prevent damage to both the
vibrator itself and to the structure in the event of faults.
Definitively close the cover once the indicated inspections
have been carried out.
Control of the sense of rotation:
In installations where the rotation direction must be ascertained (B
Fig. 27):
- Remove a weight cover (A Fig. 27).
- Use protective goggles.
- Power the electric rotary vibrator for a short period.
- If the rotation direction must be reversed, work on the terminal
box connections after having disconnected the vibrator from the
power supply line.
- Set the covers back in place, checking that the seals (OR) are
been correctly fitted into their housings. Finally, tighten the fixing
screws (B Fig. 23).

4.1 VIBRATION FORCE ADJUSTMENT

ATTENTION: This operation must only be carried out by
specialized personnel after the electrical power supply has
been disconnected.
- Remove the weight covers in order to adjust the vibration force.
- It is absolutely essential to adjust the weights in the same
direction at the two ends (Fig. 29). To allow the weights to be
precisely regulated, the electric vibrators have a patented system
that prevents the adjustable weight from turning in the wrong
direction (Fig. 28).
- Slacken the screw or nut of the moving weight (Fig. 30). The
adjustable weights at the two ends of the shaft must be positioned
so that the percentage reference scale indicates the same value.
- Once the eccentric weight has been set to the required value,
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tighten the fixing screw or nut with a torque wrench (Fig. 31) and
repeat this operation on the opposite weight (consult the
«Clamping torque for fixing screws» tables for the relative clamping
torques).
- Having completed the operation on both sides, remount the
covers with the same screws and washers, checking that the
seals have correctly fitted into their housings (Fig. 32).
4.2 STARTING AND STOPPING THE MOTOR-
DRIVEN VIBRATOR DURING USE
The vibrator must always be started by setting the power switch to
the ON position (to connect to the power supply main).
The motor-driven vibrator will now operate.
The vibrator must always be stopped by setting the power switch to
the OFF position (to disconnect from the power supply main).
SECTION 5
Servicing the motor-driven vibrator
ITALVIBRAS motor-driven vibrators need no particular maintenance.
Only authorized technicians must work on the electric rotary
vibrators.
Before servicing a vibrator, wait until the temperature of its
casing is not more than 40°C and check that it has been
disconnected from the electricity supply.
Only use genuine ITALVIBRAS spares.
If the bearings need replacing, dismantle the vibrator as explained
for the grease changing operation.
Check the condition the seals on this occasion. Replace them if necessary.
Change the bearings and specific retention rings working on a bench
and using the necessary tools.
Check the bearing housing in the flanges.
Change the flanges if they are worn.
When remounting the bearings, check that they correctly fit into their
housings. Fill the space between the retention ring and bearing with
50% grease (Fig. 33).
Remount the flanges with the new bearings, taking particular care to
check that the flange casing and shaft are square to each other.
Turn the shaft by hand and check that its float is between 0.5-1.5 mm
if roller bearings are mounted (Fig. 34).
There must be no float with ball bearings.
Complete vibrator assembly
instructions (Fig. 35).
ATTENTION: Each time the above mentioned servicing operations
are carried out, it is advisable to replace all screws and spring
washers with new ones and to tighten the screws with a torque
wrench.
ATTENTION: the clamping torque for external screws in stainless
steel (for weight covers and for terminal box cover), has to be
as indicated in the table in page 66.

5.0 LUBRICATION

The bearings are correctly lubricated when the motor-driven
vibrator is assembled.
ITALVIBRAS motor-driven vibrators are manufactured for use with
the LONG-LIFE lubrication system using KLUBER grease type
STABURAGS NBU 8 EP. The advantage of this type of lubricating
system is that the bearings will need no further greasing for at least
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in compliance with the previous