ABB MT series Installation, Operation & Maintenance Manual

Also see for M2A series: Installation and maintenance instruction Instructions Installation, operation & maintenance instructions Machine Instructions Manual

ABB MT series Installation, Operation & Maintenance Manual Manual pdf 9 page image

WARNINGUse appropriate cable glands and seals in the cableentries according to the type and diameter of thecable.Additional information on cables and glands suitable forvariable speed applications can be found from chapter 5.5.Earthing must be carried out according to local regulationsbefore the machine is connected to the supply voltage.Ensure that the motor protection corresponds to theenvironment and weather conditions; for example, makesure that water cannot enter the motor or the terminalboxes.The seals of terminal boxes must be placed correctly in theslots provided, to ensure the correct IP class.3.8.1 Connections for differentstarting methodsThe terminal box on standard single speed motors normallycontains six winding terminals and at least one earthterminal. This enables the use of DOL- or Y/D –starting.See Figure 1.For two-speed and special motors, the supply connectionmust follow the instructions inside the terminal box or in themotor manual.The voltage and connection are stamped on the ratingplate.Direct-on-line starting (DOL):Y or D winding connections may be used.For example, 690 VY, 400 VD indicates Y-connection for690 V and D-connection for 400 V.Star/Delta starting (Y/D):The supply voltage must be equal to the rated voltage ofthe motor when using a D-connection.Remove all connection links from the terminal block.Other starting methods and severe startingconditions:In case other starting methods are used, such as a softstarter, or if starting conditions are particularly difficult,please consult ABB first.3.8.2 Connections of auxiliariesIf a motor is equipped with thermistors or other RTDs(Pt100, thermal relays, etc.) and auxiliary devices, it isrecommended they be used and connected by appropriatemeans. Connection diagrams for auxiliary elements andconnection 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 ahigher measuring voltage or current may cause errors inreadings or damage the system.The insulations of the winding thermal sensors is of basictype. While connecting the sensors to control systems etc,ensure adequate insulation or isolation, see IEC 60664.NOTE!Ensure the insulation level or isolation of thermistorcircuit, see IEC 60664.3.9 Terminals and directionof rotationThe shaft rotates clockwise when viewing the shaft face atthe 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 twoconnections on the supply cables.If the motor has a unidirectional fan, ensure that it rotates inthe same direction as the arrow marked on the motor.Low voltage motor manual 01-2009 | ABB Motors and Generators EN-9