Rockwell Automation 1329R Std. Industrial AC Induction Motors - Manual (Page 10)

10 Standard Industrial AC Induction Motors
Motors with resilient cushion rings usually must be provided with a
bonding conductor across the resilient member. Some motors are
supplied with the bonding conductor on the concealed side of the
cushion ring to protect the bond from damage. Motors with bonded
cushion rings should usually be grounded at the time of installation in
accordance with the above recommendations for making ground
connections. When motors with bonded cushion rings are used in
multimotor installations employing group fusing or group protection,
the bonding of the cushion ring should be checked to determine that it
is adequate for the rating of the branch circuit overcurrent protective
device being used.
There are applications where grounding the exterior parts of a motor
or generator may result in greater hazard by increasing the possibility
of a person in the area simultaneously contacting ground and some
other nearby live electrical parts of other ungrounded electrical
equipment. In portable equipment it is difficult to be sure that a
positive ground connection is maintained as the equipment is moved,
and providing a grounding conductor may lead to a false sense of
security.
The user must select a motor starter and overcurrent protection
suitable for this motor and its application. Consult motor starter
application data as well as the National Electric Code and/or other
applicable local codes.
Starting
!
ATTENTION: When careful consideration of the hazards
involved in a particular application indicate the machine
frames should not be grounded or when unusual operating
conditions dictate that a grounded frame cannot be used,
the installer should make sure the machine is permanently
and effectively insulated from ground. In those installations
where the machine frame is insulated from ground, it is
recommended that appropriate warning labels or signs be
placed on or in the area of the equipment by the installer.
Failure to observe these precautions could result in severe
bodily injury or loss of life.
!
ATTENTION: Before starting the motor, remove all
unused shaft keys and loose rotating parts to prevent them
from flying off. Failure to observe this precaution could
result in bodily injury.
!
ATTENTION: Check direction of motor rotation before
coupling motor to load. Failure to observe this precaution
could result in damage to or destruction of the equipment.