ITALVIBRAS
68
H
B
N
MVB
/
MVB
-
FLC
The MVB series is made up of vertical vibrators with lateral
flange and shaft projecting on both sides.
The MVB-FLC series is made up of vertical vibrators with
central flange and shaft projecting on both sides.
These vibrators are typically used in circular screens and
medium-size and large sieves, and can be supplied in 4 diffe-
rent versions: A, B, C, D (see page 70) according to the type of
eccentric weights supplied with the vibrator and which must
be mounted by the user. Size 50 is only available in B, C and
D versions.
The size 50 complies with the most recent IEC and EN inter-
national standards for use in atmospheres with potentially
explosive powders. In particular, the size 50 series can be
used in areas 21 and 22.
Power supply
Three-phase voltage from 220V to 690V,
50Hz or 60Hz; suitable for use with an
inverter from 20Hz to the base frequency
with constant torque load profile.
Polarity
4 poles.
Conformity with European Directives
Low Voltage 2006/95/EC,
ATEX 94/9/EC (only size 50).
Reference Regulations
EN 60034-1, IEC/EN 61241-0, IEC/EN 61241-1
Functioning
Continual service (S1) at maximum decla-
red centrifugal force and electric power.
Intermittent services are also possible
depending on the type of vibrator and the
operating conditions. For detailed infor-
mation, contact our technical assistance
office.
Centrifugal force
Range extended up to 7000 Kgf. (68.7 KN),
with centrifugal force adjustable from 0
to 100%.
Mechanical protection
IP 66 according to IEC 529, EN 60529.
Protection against mechanical impacts
IK 08 according to IEC 68, EN 50102.
Insulation class
Class F (155°C), class H (180°C) on request.
Tropicalization
Standard on all vibrators with “drop by
drop” trickle system.
Ambient temperature
From -20°C a +40°C. Versions for higher
or lower temperatures are available on
request.
Vibrator thermal protection
Standard PTC rated thermistor heat
detectors 130°C (DIN 44081-44082) from
size 80, on request for smaller sizes. Also
on request thermistors with different tem-
peratures and anti-condensation heaters.
Fixing of the vibrator
In all positions and therefore without
restriction.
Lubrication
All vibrators are lubricated in the factory
and do not require further lubrication if
used in normal operating conditions (“FOR
LIFE” lubrication). In heavy duty operating
conditions periodical re-lubrication may
be applied.
Terminal box
Large fixed electrical connections. Special
shaped terminals allow to fix the power
supply cable, protecting it from loose-
ning.
Electric motor
Three-phase asynchronous type. Desig-
ned for maximum starting torques and
torque curves specific to requirements of
vibrating machines. Insulated windings
using “drop by drop” trickle system with
class H resin. The rotor is die cast alumi-
nium.
Casing
In spheroidal cast iron to have high
strength and optimal elasticity.
Bearing flange
Constructed in spheroidal cast iron. The
geometry of the flange transmits the load
to the casing uniformly.
Bearings
Custom made with particular geometry,
especially designed for Italvibras, suitable
to support both high radial and axial
loads.
Motor shaft
In treated steel alloy (Isothermic harde-
ning) resistant to stress.
Technical features