Operating instructions − UTD.045.09-2021.00_EN 7
–
generously grease the sealings, the shafts and the unpainted machined surfaces, if any, and periodically
control conservation state of the protective anti-rust oil;
–
for gear reducers and gearmotors supplied without oil: completely fill the gear reducers with lubrication oil
and verify the specified level before commissioning.
For storages longer than 2 years or in aggressive surroundings or outdoors, consult Rossi
.
5 - Installation
5.1 - General
Before the installation, verify that:
–
there were no damages during the storing or the transport;
–
design is suitable to the environment (temperature, atmosphere, etc.);
–
electrical connection (power supply, etc.) corresponds to motor name plate data;
–
used mounting position corresponds to the one stated in name plate.
Attention!
When lifting and transporting the gear reducer or gearmotor use through holes or tapped holes
of the gear reducer housing; be sure that load is properly balanced and provide lifting systems, and cables
of adequate section. If necessary, gear reducer and gearmotor masses are stated in Rossi technical cata-
logs.
Be sure that the structure on which gear reducer or gearmotor is fitted is plane, levelled and sufficiently
dimensioned in order to assure fitting stability and vibration absence (vibration speed
v
eff
3,5 mm/s for PN
15 kW and
v
eff
4,5 mm/s for PN > 15 kW are acceptable), keeping in mind all transmitted forces due to
the masses, to the torque, to the radial and axial loads.
For the dimensions of fixing screws of gear reducer feet and the depth of tapped holes consult the Rossi
technical catalogues.
Carefully select the length of fastening bolts when using tapped holes for gear reducer fitting, in order to
assure a sufficient meshing thread length for the correct gear reducer fitting to the machine without breaking
down the threading seat.
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 reducers size 400 use level tapped holes), interposing flexible couplings
whenever possible.
Incorrect alignment may cause breakdown of shafts and/or bearings (which may cause overheatings)
which may represent heavy danger for people.
Do not use motor eyebolts when lifting the gearmotors.
Position the gear reducer or gearmotor so as to allow a free passage of air for cooling both gear reducer and
motor (especially at their fan side).
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 dis-
sipation of heat.
Mount the gear reducer or gearmotor so as not to receive vibrations
.
Place the supplied adhesive pictogram identifying the risk associated with hot surfaces on the surfa-
ce of the gear unit in a position visible to personnel involved in machine operation and maintenance.
Mating surfaces (of gear reducer and machine) must be clean and suciently rough to provide a good friction
coecient (indicatively Ra 3,2 ÷ 6,3 µm). 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.
When tting gear reducer and machine and/or gear reducer and eventual ange B5 it is recommended to use
locking adhesives such on the fastening screws (also on ange mating surfaces).
For accessories not suplied by Rossi, pay attention to their dimensioning; consult us, if need be.
Before wiring-up the gearmotor make sure that motor voltage corresponds to input voltage. If direction of
rotation is not as desired, invert two phases at the terminals.
Y-∆ starting should be adopted for no-load starting (or with a very small load) and for smooth starts, low star-
ting current or other similar devices should be tted.
If overloads are imposed for long periods or if shocks or danger of jamming are envisaged, then motor-
protection, electronic torque limiters, uid couplings, safety couplings, control units or other similar devices
should be tted.
Usually protect the motor with a thermal cut-out however, where duty cycles involve a high number of on-
load starts, it is necessari to utilise thermal probes for motor protection (tted on the wiring); magnetothermic
breaker is unsuitable since its threshold must be set higher than the motor nominal current of rating.
Connect thermal probes, if any, to auxiliary safety circuits.
Use varistors and/or RC lters to limit voltage peaks due to contactors.
For gear reducers equipped with backstop device (see ch. 5.12), foresee a protection system where a
backstop device breaking could cause personal injury or property damage.
Whenever a leakage of lubricant could cause heavy damages, increase the frequency of inspections and/or
envisage appropriate control devices (e.g.: remote level gauge, etc.).
In polluting surroundings, take suitable precautions against lubricant contamination through seal rings or
other.
