Dust Ignition Proof Motors Dip, Ex Td; Connections For Different Starting Methods; Connections Of Auxiliaries; Terminals And Direction Of Rotation - ABB M2A Manual De Instalación E Usuario

Ex de-motors; M2KA/M3KP
The letter 'e' or 'box Ex e' is shown on the terminal box
cover.
Ensure that assembly of the terminal connection is carried
out precisely in the order described in the connection
instructions, which are found inside the terminal box.
The creepage distance and clearance must conform to EN
60079-7.

3.8.2 Dust Ignition Proof motors DIP, Ex tD

Motors have as standard the terminal box fitted on the top
with cable entry possible from both sides. A full description
is contained in the product catalogs.
Pay special attention to the sealing of the terminal box and
cables to prevent the access of combustible dust into the
terminal box. It is important to check that the external
seals are in good condition and well placed because they
can be damaged or moved during hand-ling.
When closing the terminal box cover, ensure that no dust
has settled on the surface gaps and check that the seal is
in good condition – if not, it has to be replaced with one
with the same material properties.
WARNING
Do not open the motor or the terminal box while the
motor is still warm and energized when an explosive
atmosphere is present.
3.8.3 Connections for different starting
methods
The terminal box on standard single speed motors nor-
mally contains six winding terminals and at least one earth
terminal. This enables the use of DOL- or Y/D –starting.
See Figure 1.
For two-speed and special motors, the supply connection
must follow the instructions inside the terminal box or in
the motor manual.
The voltage and connection are stamped on the rating
plate.
Direct-on-line starting (DOL):
Y or D winding connections may be used.
For example, 690 VY, 400 VD indicates Y-connection for
690 V and D-connection for 400 V.
Star/Delta starting (Y/D):
The supply voltage must be equal to the rated voltage of
the motor when using a D-connection.
10 – EN ABB Motors and Generators | Low voltage Ex motor manual 01-2007
Remove all connection links from the terminal block.
For increased safety motors, both direct-on-line and
star-delta starting of motors are allowed. In case of star-
delta starting, only Ex-approved equipment is allowed.
Other starting methods and severe starting condi-
tions:
In case other starting methods are used, such as a soft
starter, or if starting conditions are particularly difficult,
please consult ABB first.

3.8.4 Connections of auxiliaries

If a motor is equipped with thermistors or other RTDs
(Pt100, thermal relays, etc.) and auxiliary devices, it is
recommended they be used and connected by appropri-
ate means. For certain protection types, it is mandatory to
use thermal protection. More detailed information can be
found in the documents delivered with the motor. Connec-
tion diagrams for auxiliary elements and connection parts
can be found inside the terminal box.
Maximum measuring voltage for the thermistors is 2.5 V.
Maximum measuring current for Pt100 is 5 mA. Using a
higher measuring voltage or current may cause errors in
readings.
3.9 Terminals and direction
of rotation
The shaft rotates clockwise when viewing the shaft face
at the motor drive end, and the line phase sequence
- L1, L2, L3 - is connected to the terminals as shown in
Figure 1.
To alter the direction of rotation, interchange any two
connections on the supply cables.
If the motor has a unidirectional fan, ensure that it rotates
in the same direction as the arrow marked on the motor.
3.10 Protection against overload
and stalling
All hazardous area motors must be protected against
overloads, see IEC/EN 60079-14 and IEC 61241-14.
For increased safety motors (Ex e) the maximum tripping
time for protective devices must not be longer than the
time t shown on the motor rating plate.
E