Connections For Different Starting Methods; Connections Of Auxiliaries; Terminals And Direction Of Rotation - ABB MT Serie Manual De Instalación, Funcionamiento, Mantenimiento Y Seguridad

WARNING
Use appropriate cable glands and seals in the cable
entries according to the type and diameter of the
cable.
Additional information on cables and glands suitable for
variable speed applications can be found from chapter 5.5.
Earthing must be carried out according to local regulations
before the machine is connected to the supply voltage.
Ensure that the motor protection corresponds to the
environment and weather conditions; for example, make
sure that water cannot enter the motor or the terminal
boxes.
The seals of terminal boxes must be placed correctly in the
slots provided, to ensure the correct IP class.
3.8.1 Connections for different starting
methods
The terminal box on standard single speed motors normally
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.
Remove all connection links from the terminal block.
Other starting methods and severe starting
conditions:
In case other starting methods are used, such as a soft
starter, or if starting conditions are particularly difficult,
please consult ABB first.

3.8.2 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 appropriate
means. Connection 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 or damage the system.
The insulations of the winding thermal sensors is of basic
type. While connecting the sensors to control systems etc,
ensure adequate insulation or isolation, see IEC 60664.
NOTE!
Ensure the insulation level or isolation of thermistor
circuit, see IEC 60664.
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.
Low voltage motor manual 01-2009 | ABB Motors and Generators EN-9