ABB M2A series, Installation, Operation & Maintenance Instructions Manual

Page: 35 / 60

3GZF500730-70 rev. C RU-EN 01-2016 | ABB Motors and Generators EN – 35
When closing the terminal box cover, ensure that no dust
has settled on the surface gaps and check that the sealing
is in good condition – if not, it has to be replaced with an
identical seal.
WARNING
Do not open the motor or the terminal box while the
motor is still warm and energized when an explosive
atmosphere is present.
4.9.3 Connections for different starting
methods
The terminal box on single speed motors normally con-
tains a terminal block with six winding terminals and at
least one separate earth terminal. This enables the use of
DOL- or Y/D -starting. See Figure 3.
For two-speed and special motors, the terminal connec-
tion 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 (Wye/Delta) starting (Y/D):
The supply voltage of the motor must be equal to the
rated voltage when using a D-connection.
Remove all connection straps from the terminal block.
For increased safety motors (Ex e), both direct-on-line and
star-delta starting of motors are allowed. In the case of
star-delta starting, only Ex-approved equipment is allowed.
Other starting methods and severe starting
conditions:
In the case where other starting methods (e.g. converter
or soft starter) will be used in the duty types of S1 and S2,
it is considered that the device is “isolated from the power
system when the electrical machine is running” as in the
standard GOST/IEC 60079-0 and thermal protection is
optional.
4.9.4 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
appropriate means. For certain applications, it is
mandatory to use thermal protection. More detailed
information can be found in the documents delivered with
the motor. Connection diagrams for auxiliary elements and
connection parts can be found inside the terminal box.
The maximum measuring voltage for the thermistors is
2.5 V. The maximum measuring current for Pt100 is 5 mA.
Using a higher measuring voltage or current may cause
errors in readings or a damaged temperature detector.
The insulation of thermal sensors fulfills the requirements
of basic insulation.
4.10 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 3.
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.
4.11 Protection against overload
and stalling
All motors for explosive atmospheres must be protected
against overloads, see installation standards GOST R IEC
60079-14 and local installation requirements.
For Ex nA- and Ex t -type of motors, no additional safety
devices above normal industrial protection(s) are required.