26
UTD.123.2019-10.00_EN
Install the unit in such a
way that the level plug is
accessible for inspection
(where applicable).
Attention! Bearing life and
good shaft and coupling
running depend on alignment
precision between the shafts.
Carefully align the gear reducer
with the motor and the driven
machine (with the aid of shims
if need be; for gear reducer
size
>
400 use level tapped holes), interposing adequate couplings if need be.
Incorrect alignment may cause breakdown of shafts and/or bearings (which may cause overheatings)
which may represent heavy danger for people.
Position the gear reducer or gearmotor so as to allow a free passage of air for cooling both gear reducer
and motor (especially at the fan side of gear reducer and motor).
Avoid any obstruction to the air flow; heat sources near the gear reducer that might affect the
temperature of cooling air and of gear reducer (for radiation); insufficient air recycle and applications
hindering the steady dissipation of heat. Do not int
a
ke heated air.
Mount the gear reducer so as not to receive vibrations.
Mating surfaces (of gear reducer and machine) must be clean and sufficiently rough to provide a good
friction coefficient (aproximately Ra 3,2
÷
6,3
μ
m): remove by a scraper or solvent the eventual paint of
gear reducer coupling surfaces. When external loads are present use pins or locking blocks, if necessary.
For the dimensions of fixing bolts of gear reducer feet and flanges and the depth of tapped holes consult
the Rossi technical catalogs: for bolt tightening torques see ch. 7.4.
When fitting gear reducer and machine and/or gear reducer and eventual flange
B5
it is recommended to
use locking adhesives such on the fastening screws (also on flange mating surfaces).
The bonding connection of gear reducer and eventually his base, must be carried out through one of the
free casing holes:
– remove paint from mating surface;
– use conductors of adequate section according to the regulations in force, see table 3 of EN 50014
standard, considering as traverse section area of phase conductors of the installation the one of the motor
power supply cables.
– point out the place used for the earth connection with adequate symbols.
Mating surfaces of connections must be clean and protected against corrosion and conductors must not
be subjected to mechanical stresses.
The installer must make the connection on the cable using an eyelet that will then be fixed to the structure
by means of a screw; a serrated steel washer as an anti-rotation device will be interposed between the
terminal and the housing, while an elastic steel washer as an anti-loosening device will be interposed
between the head and the terminal. The eyelet terminal must be suitable to accept a cable section referred
to the table below.
Tab. 7.2
Section area of phase conductors,
S
mm
2
Min section area of relevant PE, Sp conductor
mm
2
S
16
16 <
S
35
S
> 35
S
16
0,5
S
Tab. 7.1 - Minimum safety requirements for ATEX motor
Zone
Motor
1)
Thermal probes
T
surface
1
(G)
II 2G Ex e, Ex d, Ex de
Thermistors
or Pt100
To be defined
according to
zone application
characteristics
21
(D)
II 2D IP65
2
(G)
II 3G Ex n
—
22
(D)
II 3D IP55
(II 2D IP65 for conductive dust)
1) The devices suitable for zone 1 are also suitable for zone 2; similarly the devices
suitable for zone 21 are also suitable for zone 22.