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
Issued by: MOLM
Sheet No.
3AAM101025 E
Rev. C
01.2023
Page 3 of 10
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The machines of this manual and with final
destination in the European Market has an additional
marking with:
CE mark (or, only for United Kingdom market,
UK CA mark)
Notified Body number, responsible for quality
surveillance
Specific marking of explosion protection
(“epsilon-x” symbol)
Equipment Group:
II
– Surface plants, or
I
– Underground plants (mining application)
Equipment Category:
2
or
3
utilization Zone in
accordance with EN 60079-10
Dangerous atmosphere type:
G
:
concerning explosive atmospheres
caused by gases, vapours or mists
D
concerning explosive atmospheres
caused by dust
Moreover, as these motors are explosion proof
enclosures, the marking as per IEC/EN 60079-0 and
IEC/EN 60079-1 Standards is present. The marking
contains:
Ex
symbol, which indicates that the motor has
been designed and manufactured to operate in
potentially explosive atmosphere
Level of protection (db, db eb, tb, tc)
Group identifying the nature of the potentially
explosive gas (or dust, or firedamp if available)
Temperature class (related to the nature of gas
or dust)
Equipment Protection Level (EPL)
Nameplates and markings similar as above are used
for the main terminal box too. The use of separate
nameplates and markings between the terminal
boxes and the motor is provided to cover the cases
of terminal boxes designed and manufactured under
different protection type respect to the motor, i.e.,
protection type “increased safety” (with marking Ex
eb).
Other separate plates are fitted on the motor
containing instructions for bearings’ lubrication,
safety indication etc.
1.3.3
COOLING SYSTEM
An axial fan fitted on the NDE (non-driving end) shaft
end usually activates the cooling of the motors
covered by this Manual. The fan is located into a
ventilation hub driving axially the air flux on the
cooling ribs of the motor frame. This cooling method
is the standard solution for motors operating at
practically constant speed (direct feeding from the
mains).
Normally the fan has varnished steel blades. In some
cases, can be provided with reinforced polyammidic
plastic blades. Non-standard motors are provided
with aluminum and steel.
The user of the motor is responsible to ensure that
the minimum distances from the surrounding walls
(or air circulation obstacles) indicated by the outline
drawing is respected and that cooling air is free from
chemical aggressive substances producing abnormal
corrosion of the blade material.
Special design solutions have the ventilation with the
fan driven by a separate electric motor.
Refer to the specific technical documentation for
more details.
1.3.4
MOUNTING ARRANGEMENTS
The AMD Rg motors are available with different
mounting arrangements, with horizontal and vertical
axis, with antifriction or sleeve bearings.
According to IEC/EN 60034-7 Standard the available
mounting arrangements can be:
IM 1001: motor with horizontal axis, frame with
feet down
IM 2001: motor with horizontal axis, frame with
feet down and 1 flange
IM 3001: motor with horizontal axis and flanged
face on DE side
IM 1011: motor with vertical axis, frame with
vertical feet
IM 3011: motor with vertical axis and flanged
face on DE side
IM 4011: motor with vertical axis and flanged
face on DE side
1.3.5
DIRECTION OF ROTATION
When the motor is designed with only one rotation
direction (one-direction fan) the right sense of
rotation is identified by means of a plate, fixed near
the shaft end on DE side. The plate has an arrow
clearly indicating the right rotation sense.
The motors designed for one direction of rotation
operate properly only if the rotation is in accordance
with the sense indicated by the arrow. Rotation in the
opposite sense can produce surface overheating with
values over the allowed limits for the gas sub-groups
taken into consideration. This anomalous condition
can be extremely dangerous and must be absolutely
avoided.
1.3.6
NORMAL OPERATING CONDITIONS
The AMD Rg motors are designed, according to their
standard solutions, to work within the following
ambient conditions:
Ambient temperature within the limits of:
