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 4 of 10
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Group I: -20 / +60°C
Group II: -55 / +60°C
Max operating altitude 1000 meters over the sea
level
Max self-vibration level of the foundation 0.2
mm/sec
Surrounding air free of dust, salt and corrosive
gas
In case the ambient conditions would be different
from the a.m. ones, and in accordance with the
Customer Specifications, the motors can be
designed and manufactured to operate in special
ambient conditions. These conditions, described in
full details in the Certificate of Conformity are clearly
indicated both on the nameplates and in the
technical documentation attached to each motor.
REMARK: The
guarantee will not be valid if
the specified operational conditions would be
changed during the machine lifetime.
1.3.7
SPECIAL TOOLS FOR
TRANSPORTATION AND ERECTION
During the transportation and the erection steps it
should be checked that the necessary tools and
equipment are at hand in the plant. All special tools
and equipment should be stored for future use.
1.4
SAFETY SPECIFIC
INSTRUCTIONS
1.4.1
COMMISSIONING
AND
OPERATING
SAFETY FOR HIGH AND MEDIUM
VOLTAGE MACHINES (V
nom
≥
1000 V)
1.4.1.1 GENERAL
Transportation,
electrical
and
mechanical
connections, commissioning and maintenance shall
be carried out by expert and qualified personnel, as
specified in the following paragraphs. The personnel
shall have the characteristics required to be fully
responsible, within their specified attributions, of the
job done (in accordance with the requirements of
IEC/EN 60079-14, IEC/EN 60079-17, EN 50110-1,
VDE 0105, IEC/EN 60364 Standards).
Improper use or handling can cause serious dangers
for the surrounding people or properties.
All the necessary precautions regarding the safety at
work shall be taken remembering that the motors in
operation present zones under voltage, have high
torque rotating parts and occasionally hot surfaces.
1.4.1.2 OPERATION
The motors covered by this Manual are intended for
use in industrial installations. The general operating
and functional characteristics are in accordance with
the requirements of the harmonized series of motors
described by the IEC/EN 60034 (VDE 0530)
Standard.
In particular the electromechanical design is
conceived for operation within plants’ areas
where a potentially explosive gas atmosphere
can be present.
In accordance with the a.m. characteristic, the
subject motors are classified as electrical
construction belonging to the
Group II / Group I
in
accordance with IEC/EN 60079-0 Standard, intended
for use in surface plant and for mining application.
The ensemble of frame + end-shields + bearings’
seals + cable entries, in other words the enclosure of
the motor, is classified as degree of protection
explosion-proof “d”
. The motors covered by this
Manual can be installed, in accordance with the
IEC/EN 60079-14 Standard, in industrial areas
classified as “Zone 1 and/or Zone 21” (area in which
an explosive gas/dust atmosphere is likely to occur
during the normal operation) and, obviously, in “Zone
2 and/or Zone 22” (area in which an explosive
gas/dust atmosphere does not normally exist, but
with possibility of presence in case of abnormal
operation). For more details regarding the definition
of the “Zones” see the IEC/EN 60079-10 Standard.
The design and the following verifications done by
the “Notified Labs” classifies the motors’ enclosures
covered by this Manual within the
“Group IIC”
. The
actual surface temperatures are guaranteed lower
than the limits of the
“Class T4”,
in accordance with
the IEC/EN 60079-0 Standard.
Look at the nameplate and at the additional marking
in case of special design.
The installer and the user of these motors are
responsible for the compliance of installation
areas with the a.m. definitions.
The terminal boxes can be designed and
manufactured both as explosion-proof enclosures
“db
”,
with classification Group IIC and Temperature
Class T4, or as increased safety enclosures “eb”.
Look at the nameplates, additional markings and
instruction manuals to check the protection modes
and to identify special case, if any.
Within the temperature limits specified in the Par.
1.3.5 the mechanical strength of the enclosure and
the T4 limits for the surface temperatures are
