3.4 Balancing and fitting coupling
halves and pulleys
As standard, balancing of the motor has been carried out
using half key
When balancing with full key, the shaft is marked with
YELLOW tape, with the text “Balanced with full key”.
In case of balancing without key, the shaft is marked with
BLUE tape, with the text “Balanced without key”.
Coupling halves or pulleys must be balanced after
machining 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 by
removing it using a lever pressed against the body of the
motor.
3.5 Mounting and alignment
of the motor
Ensure that there is enough space for free airflow around
the motor. Minimum requirements for free space behind the
motor fan cover can be found from the product catalog or
from the dimension drawings available from the web: see
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
foundation and the feet.
Align the motor using appropriate methods.
If applicable, drill locating holes and fix the locating pins into
position.
Mounting accuracy of coupling half: check that clearance
b is less than 0.05 mm and that the difference a1 to a2 is
also less than 0.05 mm. See Figure 3.
Re-check the alignment after final tightening of the bolts or
studs.
Do not exceed permissible loading values for bearings as
stated in the product catalogues.
3.6 Slide rails and belt drives
Fasten the motor to the slide rails as shown in Figure 2.
Place the slide rails horizontally on the same level.
Check that the motor shaft is parallel with the drive shaft.
Belts must be tensioned 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 catalogues.
WARNING
Excessive belt tension will damage bearings and can
cause shaft damage.
3.7 Machines with drain plugs
for condensation
Check that drain holes and plugs face downwards.
Machines with sealable plastic drain plugs are delivered in
open position. In very dusty environments, all drain holes
should be closed.
3.8 Cabling and electrical
connections
The terminal box on standard single speed motors normally
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. Cables for auxiliaries can be connected into
their terminal blocks as such.
Machines are intended for fixed installation only. If not
otherwise specified, cable entry threads are metric. The IP-
class of the cable gland must be at least the same as those
of the terminal boxes.
Unused cable entries must be closed with blanking
elements according to the IP class of the terminal box.
The degree of protection and diameter are specified in the
documents relating to the cable gland.
EN-8
ABB Motors and Generators |
Low voltage motor manual 01-2009
