SAFETY PRECAUTIONS B-65285EN/03
- Use a motor under an appropriate environmental condition.
Using a motor in an adverse environment may cause a failure or
trouble in it.
Refer to their respective specification manuals for details of the
operating and environmental conditions for motors.
- Do not apply a commercial power source voltage directly to a
Applying a commercial power source voltage directly to a motor
may result in its windings being burned. Be sure to use a specified
amplifier for supplying voltage to the motor.
- For a motor with a terminal box, make a conduit hole for the
terminal box in a specified position.
When making a conduit hole, be careful not to break or damage
Refer to an applicable specification manual.
- Before using a motor, measure its winding and insulation
resistances, and make sure they are normal.
Especially for a motor that has been stored for a prolonged period
of time, conduct these checks. A motor may deteriorate depending
on the condition under which it is stored or the time during which
it is stored. For the winding resistances of motors, refer to their
respective specification manuals, or ask FANUC. For insulation
resistances, see the following table.
- To use a motor as long as possible, perform periodic
maintenance and inspection for it, and check its winding and
Note that extremely severe inspections (such as dielectric strength
tests) of a motor may damage its windings. For the winding
resistances of motors, refer to their respective specification
manuals, or ask FANUC. For insulation resistances, see the
MOTOR INSULATION RESISTANCE MEASUREMENT
Measure an insulation resistance between each winding and
motor frame using an insulation resistance meter (500 VDC).
Judge the measurements according to the following table.
Insulation resistance Judgment
100MΩ or higher Acceptable
10 to 100 MΩ The winding has begun deteriorating. There is no
problem with the performance at present. Be sure
to perform periodic inspection.
1 to 10 MΩ The winding has considerably deteriorated.
Special care is in need. Be sure to perform
Lower than 1 MΩ Unacceptable. Replace the motor.