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III. Maintenance, checking
In order to prevent accidents in operation of the machine, daily monitoring or checking is required.
1. Daily checking
By touching and hearing, check the vibration and sound at the time of starting and during operation
of the machine and confirm that there is no abnormality. User is recommended to put the status of
operation on record.
Records of daily checking :-
(1) Date, time of measurement. Weather of the day of measurement
(2) Voltage, load current, frequency, rotation speed
(3) Ambient temperature
(4) Temperature of stator winding or frame
(5) Temperature and sound of bearing
(6) Abnormal vibration
(7) Cooling air condition of cooling fan
2. Periodical checking
(1) Measurement of insulation resistance
(2) Checking of bearing related items
(3) Condition of ventilation
(4) Measurement of vibration
(5) Looseness of tightening nuts
(6) Condition of direct connection of coupling and belt tension
(7) Cleaning of individual part
(8) Checking of power supply condition
(9) Checking of pulse oscillator, cooling fan
Checking items are as shown above. The insulation resistance should be measured every 6 months
and the other items should be checked once a year.
To measure and monitor the machine vibration periodically is very important for the
maintenance/checking of the machine. If vibration is large, it affects the bearing, winding and
condition of direct-connection badly and therefore, investigate the cause and repair the faulty part.
3. Bearing and lubrication
3.1 Shielded bearing
For the motors of EDM13
～
EDM22 and EDM27
～
EDM35 (non-load side), shielded type ZZ (non-
contact type sealed grease) bearing is used. Generally, the bearing should be replaced at the time
of periodical checking. Until that time, grease maintenance is not required.
