8
DC Motors
Direction of Rotation
Unless otherwise ordered, brush rigging is assembled for NEMA standard
direction of rotation, counterclockwise for motors and clockwise for
generators facing the commutator end. These motors will operate in either
direction of rotation, without changing the angle of the brush holders for
normal field weakened speed ranges. Extended field weakened speed range
motors should have the direction of rotation specified.
Drive
DC180ATZ, C180ATZ & DC210ATZ frame motors are supplied with a
shaft suitable for a belt or coupled drive.
Proper alignment is a key step for long life of bearings, shafts and belts, and
minimum downtime. Misalignment can cause excessive vibration and
damaging forces on shaft and bearings. For direct coupled drives, flexible
couplings facilitate alignment. For belt drives, the driving and driven
tension must be adjusted as required for proper operation. The belt sheaves
should be placed as close as possible to the motor bracket.
Shipping Blocks
Motors supplied with roller bearings at the drive end are shipped with
wooden blocking to prevent axial movement of the shaft during shipment.
Remove the blocking and bolts securing it and discard. Make sure motor
shafts turn freely. If motor is to be reshipped, blocking of bearing is
required.
Motor Application Data
Maximum Safe Speed
!
ATTENTION:
To guard against personal injury and/or machine
damage caused by incorrect motor rotation, verify direction of
motor rotation before coupling motor to load.
!
ATTENTION:
Ensure that all guards are properly installed, to
guard against personal injury caused by contact with rotating
parts,
!
ATTENTION:
The machinery builder and/or user are
responsible for assuring that all drive train mechanisms, the
driven machine, and process material are capable of safe
operation at the maximum speed at which the machine will
operate. Failure to observe these precautions could result in
personal injury.
