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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
General information about the installation and safety operation
In case any special accessory was provided, check
its good operation before the commissioning.
The correct and safe installation of the electrical
wiring (i.e. the separation of the power and signal
lines, the screenings of the cables etc.) is under the
responsibility of the installer.
1.4.1.6 OPERATION
During the operation of the motor the tolerances
specified by the IEC/EN 60034-1 (VDE 0530)
standards, must be respected:
Feeding voltage within ± 5% of the rated value.
Feeding frequency within ± 2% of the rated
value.
Feeding voltage having sinusoidal wave-shape
with the tolerances of the Standards.
Feeding three-phase system with symmetry
within the tolerances of the Standards.
Operation outside the a.m. limits, if not expressly
allowed and clearly reported on the nameplate, can
result in surface temperatures exceeding the limits of
the T4 temperature class and in alteration of the
electromagnetic compatibility condition of the motor.
The allowable maximum number of sequential
starting is declared in the motor specific technical
documentation.
A new starting sequence is allowed only after the
motor has cooled to the ambient temperature (for
cold starts) or to the operating temperature (for warm
starts).
If abnormal situations or functional parameters
outside the fixed limits (high temperatures, abnormal
noise, and high vibration levels) would be detected,
and if the total safety of the motor operation is in
doubt, it is suggested to stop the motor. Under these
circumstances the identification of the problem cause
is a must; if necessary the manufacturing plant
of the motor or a qualified Service organization can
be consulted.
In no circumstance the calibration of the protection
devices has to be modified, even during the trial
runs.
The vibration level of the motor coupled with the
driven machine shall be less than 4.5 mm/sec
(Vrmms), which is the limit of the "allowed" field
according to ISO 10816 Standard.
The motors covered by this Manual are characterized
by a reduced distance between the static and
rotating components in correspondence of the flame
seals of the shaft; operation with vibration level within
the "tolerable" field according to the ISO 10816
Standard is absolutely not suggested.
The ventilation channels and the frame fins shall be
always clean; inspection at regular time interval shall
be scheduled. If the motor is provided with drain
Sheet No.
3AAM101025 E
Rev. C
Page 7 of 10
plugs, they shall be opened, inspected for cleanness
and tightness and reclosed.
The regreasing of the antifriction bearings shall be
made taking care of the prescribed regreasing
intervals reported on the motor's plates; the
regreasing shall be made with the motor running.
The proper grease type shall always be used.
To evaluate the noise level emitted by the motor
during the operation refer to the documentation;
can give information on the choice and the use
of additional devices (if necessary and requested) to
decrease the noise level.
1.4.1.7 MAINTENANCE, OVERHAUL AND
REPAIR
REMARK! The personnel in charge with the
maintenance
and
repair
equipment to be installed in areas where a gas
explosion danger can exist must be skilled and
qualified.
The
a.m.
personnel
received a specific training on the technology of
the
a.m.
equipment
and
knowledge about the applicable Acts, Rules and
Standards
and
of
the
regarding the hazardous area classification.
The verifications of the jobs carried out shall be in
conformance with the requirements of the IEC/EN
60079-17 Standard. The repair techniques and the
related checks shall respect the requirements of the
"Standard for repair and overhaul of electrical
equipment to be installed in potentially explosive
atmosphere" (i.e., IEC/EN 60079-19).
Always follow the instructions contained in the
Instruction Manual and, in case of doubt; consult the
motor's Factory or an Service Factory.
It is important to remember that the motors covered
by this Manual can't be modified in any way; this is
compulsory for the components or subassemblies
related to the protection mode or to the surface
temperature (i.e., frame and end shields, covers,
flame seals, input devices to the terminal boxes,
winding etc.). When a substantial modification is
absolutely necessary, the Standard requires a new
homologation by a Notified Lab. For more details on
this subject see the IEC/EN 60079-19 Standard.
During the assembly and disassembly of the motors,
carefully follow the instructions contained in the
related paragraph of this Manual. Disassemble the
different components with care and using the proper
tools, to avoid any damage or deformation (even
small) of the flame seals provided between the shaft
and the bearings' area.
Verify with particular care all the flameproof joints
and spigot surfaces machined with small rugosity, to
01.2023
of
the
electrical
shall
have
have
sufficient
general
principles
Issued by: MOLM
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