Yale Lodeking LT Series, Руководство по эксплуатации и техническому обслуживанию, Страница: 17 / 53

HOIST OPERATION & MAINTENANCE
17
P/N: 11854801 REV. AC
September 2017
4 - STORING
Surroundings should be sufficiently clean, dry and free from
excessive vibrations (v
eff
≤
0,2 mm/s) to avoid damage to bearings
(excessive vibration should also be guarded during transit, even
if within wider range) and ambient storage temperature should be
0 ÷ 40°C: peaks of 10°C above and below are acceptable.
The gear reducers filled with oil must be positioned according to
the mounting position mentioned on the order during transport and
storage.
Every six months rotate the shafts (some revolutions are sufficient)
to prevent damage to bearings and seal rings. Assuming normal
surroundings and the provision of adequate protection during transit,
the unit is protected for storage up to 1 year.
For a 2 year storing period in normal surroundings it is necessary to
pay attention also to following instructions:
– 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 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 casing; 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 catalogues.
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
veff 3,5 mm/s for PN 15 kW and veff 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 fixing screws 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 dissipation of heat.
Mount the gear reducer or gearmotor so as not to receive vibrations.
Mating surfaces (of gear reducer and machine) must be clean and
sufficiently rough (approximately Ra
≥
6,3
μ
m) to provide a good
friction coefficient: 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 fitting gear reducer and machine and/or gear reducer and
eventual flange
B5
it is recommended to use
locking adhesives
on
the fastening screws (also on flange mating surfaces).
Before wiring-up the gearmotor make sure that motor voltage
corresponds to input voltage. If direction of rotation is not as
desired, change parameter B03-04 to change rotation.
If overloads are imposed for long periods or if shocks or danger of
jamming are envisaged, then motor-protection, electronic torque
limiters, fluid couplings, safety couplings, control units or other
similar devices should be fitted.
Motor is provided with thermal switch connected to the upward
motion (no thermal probes/thermistors). Motor is also protected
from overload via tuning to the VG+S4 inverter.
Use varistors and/or RC filters to limit voltage peaks due to
contactors.
When gear reducer is equipped with a backstop device
1 , provide 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, lubricant for food industry,
etc.).
In polluting surroundings, take suitable precautions against lubricant
contamination through seal rings or other.
For outdoor installation or in a hostile environment (atmospheric
corrosivity category C3 according to ISO 12944-2), protect the gear
reducer or gearmotor with a proper dual-compound anticorrosion
paint; added protection may be afforded by applying water-proof
grease (especialIy around the rotary seating of seal rings and at shaft
end access points).
Gear reducers and gearmotors should be protected whenever
possible and by appropriate means from solar radiation and
extremes of 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 7.
1) The presence on gear reducer of backstop device is stated by the arrow near the low speed
shaft, indicating the free rotation, excluding shaft mounted gear reducers where B or C designs
are stated (see Rossi technical catalogues).