10. Daily Maintenance
10
−
3
10.2.2 Motor inspections
Inspection
item
Inspection
cycle
Essential points
Remedy
1
Noise and
vibration
Once a
month
•
There must not be any noise or abnormal
vibration occurring that has not been noticed
before.
Check the following when an abnormality occurs.
(1) Check the base and installation.
(2) Check the core alignment accuracy of the
direct coupling.
(3) Is any vibration being transmitted from the
coupler?
(4) Is the bearing damaged or does it emit any
abnormal noise?
(5) Is there any abnormal vibration or noise in the
reduction gears or belt?
(6) Is there any abnormality in the control unit?
(7) Is there any abnormality in the cooling fan?
(8) Is the belt tension correct?
Clean
•
Is the bearing temperature normal?
(Normal is an ambient temperature of +10 to
40
°
C.)
•
Is the motor frame temperature the same as
normal?
Check the following when an abnormality occurs.
(1) Is the cooling fan rotating normally?
(2) Is any foreign matter caught and clogging the
cooling duct (between the frame and the
cover)?
(3) Is the load abnormally increased?
2
Temperatu
re rise
Once a
month
(4) Is there any abnormality in the control unit?
Refer to the
section
"Troubleshooting
".
3
Insulation
resistance
value
Once six
month
•
Is the insulation resistance value abnormally low?
Disconnect the wiring to the spindle drive unit and
carry out a megger test between the circuit batch
and the ground.
(If the value is 1M
Ω
or more at 500V megger,
there is no problem.)
If the insulation resistance is 1M
Ω
or less, the
inside of the motor must be cleaned and dried.
Disassemble the motor and dry the motor in a
drying furnace at 90
°
C or less.
4 Cooling
fan
Once a
week,
once a
month
•
Is the fan circulating air and rotating normally?
Is there any abnormal noise or vibration?
10.2.3 Regenerative resistor unit inspection
Inspection
item
Inspection
cycle
Essential points
Remedy
1 Cooling
fan
Once a
week,
once a
month
(1) Does the fan turn smoothly when rotated by
hand?
(2) Is the fan sufficiently powerful when turned ON?
(3) Is there any abnormal noise from the bearings?
Replace the
fan.