70
UTD.123.2019-10.00_EN
13 - Maintenance
Safety precautions
Maintenance on speed 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 plants”, in particular attachment B “knowledge, skills
and competences of qualified personnel, technical personnel with executive functions and operational
personnel").
Troubleshooting, diagnosis and repairs
The repair of gear reducers and gearmotors of A, E, G, H, EP series must be executed only by skilled
personnel.
For this purpose see standard IEC/EN 60079-19 “Explosive atmospheres – Part 19: repair, revision and
resetting of tools”, in particular attachment B “Knowledge, skills and competences of responsible and
operational personnel".
Do all checks and verifications according to table 14.3.
The
replacement of seal rings
, the
oil change
and in general all operations not requiring any gear reducer
opening and any replacement of transmission elements (e.g. shafts, gears, bearings, etc.) are considered
standard maintenance
operations. All these operations can be executed by
responsible qualified staff
and
without any direct involvement of Rossi personnel. The spare parts (excluding lubricant) msut be
ordered at Rossi, by stating the gear reducer identification code stated on nameplate.
Occasional maintenance
such as replacement of gear pairs, bearings, etc. must only be done by
qualified
Rossi technicians
. Therefore, the request of bearing, gear, shaft spare parts
may not be taken in
consideration without any direct intervention of Rossi field service network
. As alternative the gear
reducer will have to be sent back to Rossi for all necessary maintenance operations.
Rossi undertakes and grants no responsibility or guarantee for any damages and/or malfunctions arising
from the use of non-original Rossi spare parts and/or accessories.
13.1 - General
Before starting any maintenance operations (disassembling, oil change, seal ring change, etc.):
– ensure there is no potential explosive atmosphere all around.
– disconnect the motor (including the auxiliary equipments) from the electrical supply, and the gear
reducer from load;
– be sure that all safety systems have been activated against the accidental starting and if necessary,
utilize mechanical locking devices (to be removed before commissioning);
12.3 - Measurement of surface temperature
Measure by a thermometer the surface temperature of gear reducer close to the high speed shaft (gear
reducer) or at the coupling surface between motor and gear reducer (gearmotors) in the position which is
most protected from air circulation.
When commissioning this temperature is to be kept under control and the max value is to be noted;
the values are to be periodically checked (according to table 14.3) and compared with those which
were previously noted in order to verify if there is any increase; if a significant increase (
≈
10%)
occurs, something is not working properly and the machine must be stopped: consult Rossi.
Attention! Measure the difference in temperature (
Δ
T) compared to ambient temperature at the same
operating conditions.
Note
. Note: the max surface temperature is reached after approx 1
÷
4 h running on full load (the heating time
is proportional to gear reducer size). The difference in temperature shall not exceed ambient temperature
by more than 45° C.
