Rockwell Automation 1329R Vertical Mount, In-Line AC Motors - Manual (Page 7)

Vertical Solid Shaft Normal Thrust and In-Line AC Motors 7
Grounding
Motors should be grounded to limit their potential to ground in the
event of accidental connection or contact between live electrical parts
and the metal exteriors. See the National Electrical Code, Article 430
for information on grounding of motors, Article 445 for grounding of
generators, and Article 250 for general information on grounding. In
compliance with NEC the terminal housing has grounding provisions
which have been approved by the Underwriters Laboratory, UL, and
Canadian Standards Association, CSA. In making the ground
connection, the installer should make certain there is a solid and
permanent metallic connection between the ground point and the
motor or generator terminal housing. External grounds should not be
used on motors located in hazardous environments.
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 part or 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. 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.
Starting
The rotor should rotate freely when the shaft is turned by hand.
The motor should run smoothly with little noise. If the motor should
fail to start and produces a decided hum, it may be that the load is too
great for the motor or that it has been connected improperly. Shut
down immediately and investigate for trouble.
Operate at normal load for an initial period to check for any unusual
noise, heating or excessive current.
To reverse the direction of rotation, interchange any two of the power
leads.
!
ATTENTION: Before starting the motor, remove all
unused shaft keys and loose rotating parts to prevent them
from flying off.