Rockwell Automation 1329M AC Induction Motors, 56-5000 Frame, User Manual - Manual (Page 8)

8 AC Induction Motors
1. If a motor has become damp in shipment or in storage, measure
the insulation resistance of the stator winding.
2. If insulation resistance is low, dry out the moisture in one of the
following ways:
a. Bake in oven at temperature not more than 90˚C (194˚F).
b. Enclose motor with canvas or similar covering. Leave a hole
at the top for moisture to escape, and insert heating units or
lamps.
c. Pass a current at low voltage (rotor locked) through the stator
winding. Increase the current gradually until the winding
temperature, measured with a thermometer, reaches 90˚C
(194˚F). Do not exceed this temperature.
3. Verify that voltage and frequency stamped on motor and control
nameplates correspond with that of the power line.
4. Check all connections to the motor and control with the wiring
diagram.
5. Be sure rotor turns freely when disconnected from the load. Any
foreign matter in the air gap should be removed.
6. Leave the motor disconnected from the load for the initial start
(see following Attention). Check for proper rotation.
Check for correct voltage (within +10% of nameplate value) and
that it is balanced within 1% at the motor terminals. After the
machine is coupled to the load, check that the nameplate amps are
not exceeded. Recheck the voltage level and balance under load
per the above guidelines.
Shut down the motor if the above parameters are not met or if any
other noise or vibration disturbances are present. Consult NEMA
guidelines or the equipment manufacturer if any questions exist
before operating equipment.
Allowable Voltage and Frequency Range
If voltage and frequency are within the following range, motors will
operate, but with different characteristics than obtained with correct
nameplate values.
1. Voltage: Within 10% above or below the value stamped on the
nameplate. On three phase systems the voltage should be
balanced within 1%. A small voltage unbalance will cause a
significant current unbalance.
!
ATTENTION: To guard against personal injury and/or
machine damage, ensure that belts are properly installed,
before energizing any motor with a nameplate that reads
“Belted Duty Only.”
Minimum Insulation Resistance (in Megohms) = 1 +
Rated Voltage
1000
Do not attempt to run the motor if the insulation resistance is below this value.