Balancing And Fitting Coupling Halves And Pulleys; Mounting And Alignment Of The Motor; Slide Rails And Belt Drives; Machines With Drain Plugs For Condensation - ABB Low Voltage Motors Manuel D'installation, D'exploitation Et De Maintenance

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.
EN-8
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.
WARNING
Use appropriate cable glands and seals in the
cable entries according to the type and diameter of
the cable.
Additional information on cables and glands suitable for
variable speed applications can be found from chapter
5.5.
Earthing must be carried out according to local
regulations before the machine is connected to the supply
voltage.
ABB/Manual for Low Voltage Motors 01-2009