Rossi G Series User Manual

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Operating instructions G series UTD.187.2019.09.00_EN
UTD.187.2019.09.00_EN Operating instructions G series
5 Installation of gear reducer
5.1 - General
Before the installation, verify that:
– There are no damages on shafts and on mating surfaces;
– gear reducer specifi cations are adequate to ambient conditions (temperature, atmosphere, etc.);
– the structure on which gear reducer is fi tted is plane, levelled and suffi ciently dimensioned in order to assure
fi tting stability and vibration absence (vibration speed v
eff
< 3,5 mm/s for P
N
< 15 kW and v
eff
< 4,5 mm/s for
P
N
> 15 kW are acceptable), keeping in mind all transmitted forces due to the masses, to the torque, to the
radial and axial loads;
– Used mounting position corresponds to the one stated on name plate;
Attention! Bearing life, 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).
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 motor fan sides).
– Avoid any obstruction to the air fl ow; heat sources near the gear reducer that might aff ect the temperature
of cooling air and of gear reducer (for radiation); insuffi cient air recycle and applications hindering the steady
dissipation of heat;
Verify that the gear reducer housing is dust-free in order to achieve an effi cient heat dispersal.
Mating surfaces (of gear reducer and machine) must be clean and suffi ciently rough to provide a good friction
coeffi cient (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 fi tting gear reducer and machine and/or gear reducer and eventual fl ange B5 it is recommended to use
locking adhesives such on the fastening screws (also on fl 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
starting current or other similar devices should be fi tted.
If overloads are imposed for long periods or if shocks or danger of jamming are envisaged, then motor-
protection, electronic torque limiters, fl uid couplings, safety couplings, control units or other similar devices
should be fi 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 (fi 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 fi 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.
For outdoor installation or in a hostile environment (corrosivity class C3 according to ISO 12944-2) protect
the gear reducer or gearmotor with a proper anti-corrosion paint (see ch. 3.4), using water-repellent grease
(especially around the rotary seating of seal rings and the accessible zones of shaft end).
Gear reducers and gearmotors should be protected whenever possibile and by appropriate means from solar
radiation and extremis of weather; weather protection becomes essential when high or low speed shafts are
vertically disposed or when the motor is installed vertical with fan uppermost.
For ambient temperature greater than +40 °C or less than 0 °C, consult Rossi.
When gear reducer or gearmotor is supplied with water cooling by coil or independent cooling unit, see ch. 8.

Rossi G Series Specifications

General

Brand	Rossi
Model	G Series
Category	Engine
Language	English