Motor Inspections; Regenerative Resistor Unit Inspection - Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual

10.2.2 Motor inspections

Inspection Inspection
item
Noise and Once a
1
vibration month
Temperatu Once a
2
re rise month
Insulation
Once six
3 resistance
month
value
Once a
week,
4 Cooling fan
once a
month

10.2.3 Regenerative resistor unit inspection

Inspection Inspection
item
Once a
week,
1 Cooling fan
once a
month
10. Daily Maintenance
cycle
• 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?
• 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?
(4) Is there any abnormality in the control unit?
• 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 1MΩ or more at 500V megger,
there is no problem.)
If the insulation resistance is 1MΩ 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.
• Is the fan circulating air and rotating normally?
Is there any abnormal noise or vibration?
cycle
(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?
Essential points
Essential points
10 − 3
Remedy
Clean
Refer to the
section
"Troubleshooting
".
Remedy
Replace the
fan.