Connections For Different Starting Methods; Connections Of Auxiliaries; Terminals And Direction Of Rotation - ABB Low Voltage Motors Manuel D'installation, D'exploitation Et De Maintenance

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.
ABB/Manual for Low Voltage Motors 01-2009

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.
EN-9