
B-65292EN/03 INSTRUCTION 1.GENERAL
- 57 -
Check resistance and insulation
Before and after assembling a spindle, check the resistance and
insulation of winding. And also, check these on regular intervals.
WARNING
Shut down the power supply and disconnect the
leads which are connected to the amplifier before
measuring to prevent an electric shock.
And insulate the terminals that are not used.
- Winding resistance
Use milli-ohm meter to measure the winding resistance according to
the following procedure. Insulate the terminals that are not used while
measuring. For details of the measuring method and winding
resistance, refer to "2.2 CHECKING THE WINDING
RESISTANCE."
NOTE
Use milli-ohm meter to measure the resistance.
General ohm meter cannot measure the resistance
correctly.
- Insulation between winding and frame
Measure at 500VDC with mega-ohm tester. And judge according to
following.
Over 100MΩ
Good
10 - 100MΩ
Deterioration has begun. It does not affect normal use. But
check the insulation on regular intervals.
1 - 10MΩ
Special care is required. Check the insulation on regular
intervals.
Under 1MΩ
Damaged. Change the motor to the new one.
CAUTION
Shut down the power supply and disconnect the
leads connected to the amplifier before checking
the resistance and insulation to prevent an electric
shock. Also insulate the terminals that are not used.