ABB M2A series, Installation, Operation & Maintenance Instructions Manual

3GZF500730-70 rev. C RU-EN 01-2016

 | ABB Motors and Generators EN – 33

4.5  Balancing and fitting 

coupling halves and pulleys

As standard, balancing of the motor has been carried out 
using a half key.

Coupling halves or pulleys must be balanced after machin-
ing the keyways. Balancing must be done in accordance 
with the balancing method specified for the motor.

Coupling halves and pulleys must be fitted on the shaft by 
using suitable equipment and tools which do not damage 
the bearings and seals.
Never fit a coupling half or pulley by hammering or remove 
it by using a lever pressed against the body of the motor

4.6  Mounting and alignment 

of the motor

Ensure that there is enough space for free airflow around 
the motor. It is recommended to have a clearance 
between the fan cover and the wall etc. of at least ½ of the 
air intake of the fan cover. Additional information may be 
found from the product catalog or from the dimension 
drawings available on our web pages: www.abb.com/
motors&generators.

Correct alignment is essential to avoid bearing, vibration 
and possible shaft failures. 
Mount the motor on the foundation using the appropriate 
bolts or studs and place shim plates between the founda-
tion and the feet.

Align the motor using appropriate methods.
If applicable, drill locating holes and fix the locating pins 
into position.

Mounting accuracy of a coupling half: check that clear-
ance b is less than 0.05 mm and that the difference 

a1

 to 

a2

 is also less than 0.05 mm. See figure 2.

Re-check the alignment after the final tightening of the 
bolts or studs.

Do not exceed permissible loading values for bearings as 
stated in the product catalogs.

Check that the motor has sufficient airflow. Ensure that no 
nearby objects or direct sunshine radiate additional heat to 
the motor.

For flange mounted motors (e.g. B5, B35, V1), make sure 
that the construction allows sufficient air flow on the outer 
surface of the flange.

4.7  Radial forces and belt drives

Belts must be tightened according to the instructions of 
the supplier of the driven equipment. However, do not 
exceed the maximum belt forces (i.e. radial bearing 
loading) stated in the relevant product catalogs.

WARNING

Excessive belt tension will damage bearings and can 
cause shaft breakage. For Ex d and Ex de-motors 
excessive belt tension may even cause danger by 
eventual mutual contact of the flame path parts.

4.8  Motors with drain plugs 

for condensation

Check that drain holes and plugs face downwards. In 
vertical position mounted motors the drain plugs may be in 
horizontal position.

Non-sparking & Increased safety motors

Motors with sealable plastic drain plugs are delivered with 
these in the closed position in aluminum motors and in the 
open position in cast iron motors. In clean environments, 
open the drain plugs before operating the motor. In very 
dusty environments, all drain holes should be closed.

Flameproof motors

Drain plugs, if requested, are located at the lower part of 
the end shields in order to allow condensation to escape 
from the motor. Open the drain plug by turning it counter-
clockwise, tap it to check free operation and close it by 
pressing and screwing it clockwise. 

Dust Ignition Protection Motors

The drain holes must be closed on all dust ignition 
protection motors.

4.9  Cabling and electrical 

connections

The terminal box on standard single speed motors nor-
mally contains six winding terminals and at least one earth 
terminal.

In addition to the main winding and earthing terminals, the 
terminal box can also contain connections for thermistors, 
heating elements or other auxiliary devices. 

Suitable cable lugs must be used for the connection of all 
main cables. Wiring for auxiliaries can be connected into 
their terminal blocks as such.

Motors are intended for fixed installation only. Unless 
otherwise specified, cable entry threads are metric. The 
protection class and the IP-class of the cable gland must 
be at least the same as those of the terminal boxes.

Ensure only certified cable glands for increased safety and 
flameproof motors are used. For non-sparking motors, 
cable glands must comply with GOST R IEC 60079-0. For 
Ex tb Gb / Ex tc Dc motors, cable glands must comply 
with GOST R IEC 60079-0 and GOST R IEC 60079-31.

NOTE!

Cables should be mechanically protected and 
clamped close to the terminal box to fulfill the 
appropriate requirements of GOST R IEC 60079-0  
and local installation standards.