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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
coming from the motor itself or from the exhausting
of near apparatuses.
1.4.1.5 ELECTRICAL WIRING
REMARK! The personnel in charge with the
electrical wiring of components installed in
areas where a gas explosion danger can exist
must
be
personnel shall have sufficient knowledge about
the applicable Acts, Rules and Standards and of
the general principles regarding the hazardous
areas classification; moreover they shall have
attended specific training regarding the required
protection modes and the electrical wiring
techniques in hazardous areas.
All the electrical wiring of the main feeding circuit of
the motor shall be done with the motor stopped. Due
to the electrical wiring of the main feeding circuit that
involves medium or high voltage, the following safety
rules must be taken:
Make absolutely sure that the feeding system is
out of voltage!
Provide safeguard devices against reclosing of
the breakers!
Verify safety distance and limits for the electrical
insulation from the mains!
Connect to hearth and short-circuit the cables on
which the job is in progress!
Cover or provide safety barriers against the
neighboring live electrical circuit!
Make sure that even the auxiliary circuits (i.e. the
internal space heaters) are surely out of voltage.
The motors' body and all the accessories shall be
connected to earth, in accordance with the relevant
Standard. On the frame and on the terminal boxes
suitable earthing connection points are provided.
Consult the drawings of the specific technical
documentation attached to this Manual and the
marking of the terminals for correct electrical wiring.
Look at the connection indication fixed inside the
terminal boxes.
The cables' inputs into the terminal boxes must be
done using the certified cable glands provided with
the motors and reported on the drawings. Make sure
that the cable inputs have done respecting the
suitable mechanical protection degree (IP ....)
reported on the nameplate.
skilled and
qualified.
The
If it would be necessary to use different type of
cable glands devices, it is compulsory that the
used cable glands are of certified type "Ex db" o
"Ex eb" depending on the type of protection
reported in the nameplate and that the cable
glands
are
fixed
a.m.
respecting the requirements of the European
Standard.
The responsibility of use and assembling the
proper cable glands lies always on the installer
of the motor.
The terminals' connections must be done with
suitable components and methods and must assure
permanent and safe contacts, even under severe
operational conditions. If type of protection "eb"
(increase safety) is provided for the terminal boxes,
make sure that the distances in air between the bare
living conductors and the frame or metallic parts
connected to earth were higher than the minim limits
declare in IEC/ EN 60079-7 according to the voltage.
Verify all the openings of the terminal boxes not
engaged by cable glands; these openings must be
closed with explosion proof plugs "Ex db" certified.
Make sure that the inside of the terminal boxes is
free from moisture, dirt or foreign bodies.
Before the reassembling of the covers for the
explosion proof terminal boxes (type of protection
"d") verify that the machined surfaces are perfectly
clean and without deformations or scratches. Lightly
smear the joining surfaces with grease suitable to
avoid their corrosion.
During the trial runs with motor uncoupled from the
driven machine provide a safe locking of the shaft
key. In case a brake device would be provided,
check its good operation before putting the motor into
service.
When the motor is fed by a frequency converter
(inverter), in addition to the specific instructions
contained in the relevant Manuals, it is necessary to
ensure that the metallic structures of the motor and
of the driven equipment are put at the same earth
potential even in presence of the high frequency
components of current and voltage generated by the
inverter. This condition is satisfied when all the
components of the shaft line are fixed on the same
metallic basement. When this is not the case all the
external metallic
components shall be connected together with a flat
copper conductor having cross section 0.75x70 mm
ore more, providing that the ratio width/height of the
section is more than 10. It is also possible to use two
circular cables having minimum cross section of 50
sq-mm placed at 150 mm of distance between them.
Sheet No.
3AAM101025 E
Rev. C
01.2023
Page 6 of 10
to
the
terminal
boxes
structures of the shaft
line
Issued by: MOLM
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