Publicidad
GB
Motors series O-M
Safety, installing
maintenance instructions
www.orange1.eu
(Rev.01 – 28-06-2021)
1.GENERAL SAFETY INFORMATION
These security instructions refer to the installation,
utilization and maintenance of motors O-M series to be used
in potentially explosive areas with presence of combustible
GAS and/or DUST. The information of these instructions are
only for qualified personnel. Except for the opening of terminal
cover, any other opening cancels the warranty conditions of
the motors.
Here below you can see the different markings of the motors
and the different zones where they can be used:
II 2G Ex db IIC T3 Gb T.amb –40° C , +60° C
II 2G Ex db IIC T4 Gb T.amb –40° C , +60° C
II 2G Ex db IIC T5 Gb T.amb –40° C , +40° C
II 2G Ex db eb IIC T3 Gb T.amb –40° C , +60° C
II 2G Ex db eb IIC T4 Gb T.amb –40° C , +60° C
II 2G Ex db eb IIC T5 Gb T.amb –40° C , +40° C
II 2D Ex tb IIIC T125° C T.amb –40° C , +60° C
(maximum thicknes of dust layer 5mm)
The motors comply with the Essential Health and Safety
Requirements for potentially explosive atmospheres provided
by European Standards:
IEC/EN 60079-0, IEC/EN 60079-1, IEC/EN 60079-7,
IEC/EN60079-31
Electric rotating machines present dangers from live and
rotating parts, and probably very hot surfaces. All work on
them including transportation , connection , commissioning
and maintenance must be by qualified and responsible
specialists ( IEC 364 must be observed). Inadequate work
can lead to severe damage to persons and property.
It is imperative to observe the data printed on the
nameplate before operating the motor. Low voltage motors
are components to be installed into machines in accordance
with Directive 2006/42/EC.
Commissioning is not allowed until the conformity of the end
product with this directive has been established.
These asynchronous motors comply the EMC (2014/30/UE)
Directive and no particular shielding is necessary when
connected to a pure sinewave voltage supply.
Before working on the motor, ensure it has stopped and is
disconnected from the power supply (including auxiliary
equipment).If there is any form of automatic starting, automatic
resetting, relays or remote starting, avoid any possibility of
unexpected re-starting, paying attention to specific
recommendations on equipment application.
2. TRANSPORT, STORAGE
On receipt verify that the motor has not been damaged
during transport and in this case avoid any installation and
communicate immediately to the transport service.
1
Eyebolts, when provided with the motor, must be tightened
properly as they are suitable only for lifting the motor, no
additional loads are allowed to be attached. If necessary use
sufficiently dimensioned devices as a means of transport.
Do not use any projection of the motor body to hang the
motor for transport purposes.
If two eyebolts are present on the motor use both for lifting.
Store low voltage motors in a dry, dust free and low vibration (v
eff <0,2 mm/s) area to prevent bearing damage. Before
commissioning, the insulation resistance must be measured. In
case of values < 1,5 MΩ the winding must be dried. Contact
our technical department directly for information on the drying
procedure.
3. INSTALLATION
Installation must comply with the rules of the
standard IEC/EN 60079-14 or with the national standards
(edition into effect).
Before the installation in an explosive atmosphere, the
installer must ensure that the motor is suitable for the
classified area in consideration of the different inflammable
substances present in the installation area (please verify the
marking on the motor plate before installation).
The motor must be installed only by qualified people with
knowledge about electrical apparatus for
atmospheres and electrical installations in hazardous areas
and has to be done with the motor and driven machine at
standstill, electrically dead and locked against restart.
The rating on the nameplate corresponds to voltage and
Zones
1, 2
frequency of the power supply and all other electrical and
mechanical data, as well as the safety data regarding the
motor
(protection
type,
temperature
temperature etc.).
WARNING: DO NOT OPEN IN PRESENCE OF EXPLOSIVE
Zones
ATMOSPHERE
21, 22
. The coupling components must also be balanced with a
half key on a smooth mandrel. Coupling belts and pulleys
must be assembled by suitable tools to p
bearings.
After assembly check that the coupling components are well
fixed on the shaft end; they must be properly pushed against
the shaft shoulder. Where the hub of the coupling gear is
shorter than the shaft end, compensate the difference by use
of a bush spacer.
Too large or too small pulleys can impair the shaft bearing life;
similarly excessive belt tension can cause low bearing life or
shaft breakage.
The motors must be installed in a proper position so that
cooling air can go in and out easily. The ventilation must not be
hindered and the outgoing air - also from adjacent units - must
not be directly sucked in again. To keep a good cooling of the
motor, there must be a minimum distance of 40mm between
the fan cover and another element capable to reduce the air
aspiration of the ventilation. Avoid heat sources near the motor
that might affect the temperatures both of cooling air and of the
motor.
In case of outdoor installation protect the motor from solar
radiation and extremes of weather. In case of vertical
mounting with shaft down use fan cover with rain roof. It is
advisable to protect the motor with such as overcurrent
devices and torque limiters where it is not protected by
winding temperature transducers connected to appropriate
switchgear.
In case of environments with wide thermal excursions and
when can be preview the presence of moisture, Orange1 EM
will equip the motor with heaters.
Instead of use anti-condensation heaters, is possible to
supply the motor on pins U1-V1 with a voltage 4-10% of the
rated motor phase-voltage; 20-30% of the rated current is
enough to heat the motor.
Check the direction of rotation with the motor not coupled
fastening the shaft key to avoid its violent ejection during
rotation.
If the direction of rotation is not as desired, disconnect
the motor and wait until the motor is completely stopped:
in case of three phase motors interchange two phases at
the terminals.
in case of single phase motors refer to the diagram supplied
with the motor
Cable entries
Depending on the type of protection of the motor the
cable entries shall comply with the standards written in
the table and having the range of temperature of the
motor itself:
Type of
T.amb
protection
Ex eb
–40° C , +60° C
GAS
Ex db
–40° C , +60° C
DUST
Ex tb
–40° C , +60° C
The cable diameter for each size of cable gland are
like below:
Cable gland
Motor
thread
size
explosive gas
M16x1.5
(*) on request
56-63-71-80-90-100-
M20X1.5
112
M25X1.5
132
M32X1.5
160-180
Cable glands and plugs if not supplied with the motor shall be
like above.
class,
ambient
The cable gland mounted on the terminal box shall be covered
by a valid ATEX and IECEx certificate according to the type of
protection of the terminal compartment (Ex db and or Ex eb
and or Ex tb), It shall have a minimum protection degree IP66
according to EN/IEC 60529 and EN/IEC 60079-0; the
operating temperature of the cable gland shall be included in
rotect
the
the temperature range defined by the minimum ambient
temperature reported on the Ex Label of the motor and the
maximum ambient temperature + 25° C.
The cable glands shall be completely screwed to the
motor with a tightening torque of 5Nm
- The field wiring shall be carried out using cables having an
overall sheath operating temperature at least equal to the
maximum ambient temperature of the motor +25° C and
conductor insulation temperature at least equal to the
maximum ambient temperature of the motor +35° C.
Capacitor housing cable glands and motor wires cable glands
inside Ex enclosures are factory installed. It is not allowed to
unscrew or modify the factory installation.
As the feet can be mounted on the frame it is possible to fix
them in 3 different positions so to have the possibility to have
the terminal box on the top or on the right and left sides of the
motor.
At the same time the terminal box can be mounted on the
motor so to have the cable entries where it is necessary. So
the cable entries can be in the four different positions. This
operation has to be done before connection, removing the box
cover, unscrewing the 4 screws that fix the box to the motor.
Screw completely in respect of the tightening torque of
TIGHTENING TORQUE TABLE
4.CONNECTION TO THE POWER SUPPLY
Only qualified people are allowed to connect the
motor to the power supply. The connection to the electric
supply must be done by through the cable entry supplied with
the motor or through another type of cable entry certified in
accordance with the European Standards showed above in
compliance with Directive 2014/34/EU and IECEx approved.
In case of motor complete with cable, the free end of the
cable should be connected in a safe zone or inside an Ex
enclosure with a type of protection suitable for the explosive
atmosphere.
Always refer to the data printed on the nameplate for
voltage and frequency to ensure the motor is appropriate for
the mains supply.
If not specified it is possible to assume tolerances of ±5% on
voltage and ±1% on frequency indicated on the nameplate (X
on the certificate number
The connection diagrams are normally supplied together with
the motor or are printed in the terminal box. If they are
missing please refer to this manual or contact directly to our
technical office.
Check and make sure that, in the case of star /delta start, the
Standard
switching from star to delta can only be executed after the
starting current of the star step has fallen; this is important
IEC/EN 60079-0, 7
because of the risk of not allowed operational loads.
IEC/EN 60079-0, 1
The cable size choice must be suitable to the motor ratings
IEC/EN 60079-0, 31
and the plant type.
The motors shall be protected by a tripping device, which in
case of breakdown could cut off the power supply before the
Range of cable diameter
surface temperature exceeds the ignition temperature of the
(mm)
explosive atmosphere.
6-12
6-12 / (*)9-16
The motors with increased safety terminal box ("eb") are
built with a special terminal board with improved insulation and
12,5-20,5
17-26
distances.
The Ex d motors have a normal terminal board.
TIGHTENING TORQUE TABLE
Thread
Tightening Torque (Nm)
The power connection shall be made as in the picture. The
nuts shall have to be tightened according to TIGHTENING
TORQUE TABLE to avoid any loosening.
IMPORTANT: Motors with Ex eb terminal box REPLACE
THE GASKET (SEAL) IN THE RIGHT POSITION BEFORE
CLOSING THE TERMINAL BOX AND SCREW
COMPLETELY ALL THE SCREWS.
Earth connection
In addition to the earth screw terminal fitted inside the
terminal box, another external one must be on the motor
frame. If the line conductors have a section S the earth
connections have to be:
Earth conductor
= S
16
≥ 0,5 S
Connection of auxiliary cables ("e" terminal box)
If the motor is provided with terminal board with auxiliary
pins the connection of thermal protection and/or heaters can
be made in such pins.
M4
M5
M6
M8
1,5
2
3
6
Line conductors
2
S ≤ 16 mm
2
2
16 mm
< S ≤ 35 mm
2
S > 35 mm
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