25
UTD.123.2019-10.00_EN
7 – Installation
7.1 - Maintenance and cleaning
General safety precautions
Maintenance on gear reducers and gearmotors series A, E, G, H, EP, must be performed only by expert
personnel, whose training has included all the necessary instructions on the equipment protection
methods, on the installation methods, on the relevant laws and regulations and on the general principles of
classification of places with danger of explosions (see IEC/EN 60079-17 "Explosive atmospheres - Part 17:
verification and maintenance of electrical installations" - Annex B: "knowledge, skills and competences of
the responsible personnel, technical personnel with executive functions and operating personnel").
Troubleshooting, diagnosis and repairs
The repair of gear reducers and gearmotors of A, E, G, H, EP series must be executed by skilled personnel
only (see IEC/EN 60079-19 "Explosive atmospheres - Part 19: repair, revision and restoration of equipment"
- Annex B "knowledge, skills and competences of responsible and operational personnel").
7.2 - General
Before the installation,
verify that
:
– there is
no potential explosive atmosphere all around
;
–
the category of the machine is suitable to the area where it will be used and the design is suitable
to the environmental conditions
(temperature, atmosphere, etc.); for gearmotors it is necessary to do
verification both regarding gear reducer and motor on the basis of the data of the respective name plates
because their limits of application may be different.
Attention!
Nameplate data refer to gear reducer
only; when it is assembled together with a motor, the application limits derive from the combination of
the two nameplates considering the most restrictive ones;
– Basing on the name plate data and additional literature, if any, the size of the unit has been chosen
to
meet the requirements of the application
, that is service factor fs = PN1/P1 is greater than or equal to fs
requested determined basing on instructions given in par. 7.15.
– in each case,
fs is always
1
(
0,85
for worm gear reducers and gearmotors series A);
– input power
P
1
is to be lower than thermal power
determined basing on instructions given in par. 7.16;
for further instructions consult Rossi;
– Verify the radial and axial loads are to be according to the max admissible value stated in our technical
catalogues. In doubtful cases consult Rossi;
– There were no damages during transport or storage.
– The motor shaft has not been displaced axially in such a way as to result in the fan blades touching the
fan cover or shield causing possible damage to one or more bearings.
– Gear reducers supplied complete with oil contain the correct quantity of oil for the mounting position
specified on the nameplate (see ch. 15 ... 19); and there is a filler plug with filter and valve (see ch. 13.6);
– Unpainted surfaces not used for assembly are protected with paint suitable for the installation; the paint
should be conductive);
– 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 P1 < 15 kW and
veff < 4,5 mm/s for P1 > 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;
– Electrical connection (power supply, etc.) corresponds to motor name plate data.
The
probes
(e.g.: Pt 100) and the
thermostats
, when foreseen,
are separately supplied
and therefore it
is necessary to install them on the gear reducer
, in the position stated in the
SPT scheme
attached to
present ATEX Operating Instructions and following the instructions in par. 11.2, 11.3, 11.4, 11.5, 11.6.
Connect to proper checking device such probes
: see SPT scheme and ch. 11.2, 11.3, 11.4, 11.5, 11.6.
Connect the eventual coil (or internal heat exchanger) to the external water circuit.
For equipments suitable for speed variation, utilise a control system (e.g. encoder connected to a
safety system) in order not to exceed the maximum input speed of 1 500 min-1.
The gear reducer or gearmotor can be installed only if in the environment there is no potentially
explosive atmosphere during the installation.
When a motor is assembled to a gear reducer or gearmotor without motor verify that it satisfies the
minimum safety requirements according to ATEX 2014/34/EC (see table 7.1 ) and that the relevant
application limits (
n
1max
,
P
1max
, etc.) stated on the nameplate of gear reducer (or of gearmotor without
motor).